这里续写上一章博客（110章博客）：
现在我们来学习一下高级的技术，前面的mvc知识，我们基本可以在67章博客及其后面相关的博客可以学习到，现在开始学习精髓：
< packaging> </ packaging> < dependencies> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> </ dependencies> <?xml version="1.0" encoding="UTF-8"?>
< web-appxmlns = " http://xmlns.jcp.org/xml/ns/javaee" xmlns: xsi= " http://www.w3.org/2001/XMLSchema-instance" xsi: schemaLocation= " http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version = " 4.0" > < servlet> < servlet-name> </ servlet-name> < servlet-class> </ servlet-class> < init-param> < param-name> </ param-name> < param-value> </ param-value> </ init-param> </ servlet> < servlet-mapping> < servlet-name> </ servlet-name> < url-pattern> </ url-pattern> </ servlet-mapping> </ web-app> <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<button id="btn">ajax提交</button>
<script>$("#btn").click(function () {let url = 'test/in';let data = '[{"id":1,"username":"张三"},{"id":2,"username":"李四"}]';$.ajax({type: 'POST',//大小写可以忽略url: url,data: data,contentType: 'application/json;charset=utf-8',success: function (data) {console.log(data);alert(data)}})})
</script>
</body>
</html>< beansxmlns = " http://www.springframework.org/schema/beans" xmlns: mvc= " http://www.springframework.org/schema/mvc" xmlns: context= " http://www.springframework.org/schema/context" xmlns: xsi= " http://www.w3.org/2001/XMLSchema-instance" xsi: schemaLocation= " http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsd" > < context: component-scanbase-package = " com.controller" /> < mvc: annotation-driven> </ mvc: annotation-driven> </ beans> package com. entity ; public class User { String id; String username; public String getId ( ) { return id; } public void setId ( String id) { this . id = id; } public String getUsername ( ) { return username; } public void setUsername ( String username) { this . username = username; } @Override public String toString ( ) { return "User{" + "id='" + id + '\'' + ", username='" + username + '\'' + '}' ; }
} package com. controller ; import com. entity. User ;
import org. springframework. stereotype. Controller ;
import org. springframework. web. bind. annotation. RequestBody ;
import org. springframework. web. bind. annotation. RequestMapping ;
import org. springframework. web. bind. annotation. ResponseBody ; import java. util. List ; @Controller
@RequestMapping ( "/test" )
public class test { @RequestMapping ( "in" ) @ResponseBody public List < User > ajax ( @RequestBody List < User > ) { System . out. println ( list) ; return list; }
} package com. Interceptor ; import org. springframework. web. servlet. HandlerInterceptor ; public class MyInterceptor implements HandlerInterceptor {
}
package org. springframework. web. servlet ; import javax. servlet. http. HttpServletRequest ;
import javax. servlet. http. HttpServletResponse ;
import org. springframework. lang. Nullable ; public interface HandlerInterceptor { default boolean preHandle ( HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { return true ; } default void postHandle ( HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception { } default void afterCompletion ( HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception { }
} package com. Interceptor ; import org. springframework. web. servlet. HandlerInterceptor ;
import org. springframework. web. servlet. ModelAndView ; import javax. servlet. http. HttpServletRequest ;
import javax. servlet. http. HttpServletResponse ; public class MyInterceptor implements HandlerInterceptor { @Override public boolean preHandle ( HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System . out. println ( handler) ; System . out. println ( "Handler业务逻辑执行之前拦截一次，我是第一次" ) ; return true ; } @Override public void postHandle ( HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System . out. println ( handler) ; System . out. println ( modelAndView) ; System . out. println ( "在Handler逻辑执行完毕但未跳转页面之前拦截一次，我是第二次" ) ; } @Override public void afterCompletion ( HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System . out. println ( handler) ; System . out. println ( ex) ; System . out. println ( "在跳转页面之后拦截一次，我是第三次" ) ; }
} < mvc: interceptors> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor" > </ bean> </ mvc: interceptor> </ mvc: interceptors> < mvc: interceptors> < beanclass = " com.Interceptor.MyInterceptor" > </ bean> </ mvc: interceptors> < mvc: interceptors> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor" > </ bean> </ mvc: interceptor> </ mvc: interceptors> < mvc: interceptors> < mvc: interceptor> < mvc: mappingpath = " /**" /> < mvc: exclude-mappingpath = " /demo/**" /> < beanclass = " com.Interceptor.MyInterceptor" > </ bean> </ mvc: interceptor> </ mvc: interceptors>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
<%System.out.println(1);
%>
1
</script>
</body>
</html><%System.out.println(1);
%>
< beanid = " viewResolver" class = " org.springframework.web.servlet.view.InternalResourceViewResolver" > < propertyname = " prefix" value = " /" > </ property> < propertyname = " suffix" value = " .jsp" > </ property> </ bean> @RequestMapping ( "ix" ) public String ix ( ) { return "test" ; }
public String ix ( String a, Integer b) {
@RequestMapping ( "ix" ) public void ix ( String a, Integer b) { }
@RequestMapping ( "ix" ) public String ix ( String a, Integer b) throws IOException { return null ; }
@RequestMapping ( "ix" ) public void ix ( String a, Integer b, HttpServletResponse mm) throws IOException { mm. setContentType ( "text/html;charset=utf-8" ) ; PrintWriter writer = mm. getWriter ( ) ; writer. println ( "哈哈哈" ) ; }
@RequestMapping ( "ix" ) public void ix ( String a, Integer b, HttpServletResponse mm) throws IOException {
}
package com. Interceptor ; import org. springframework. web. servlet. HandlerInterceptor ;
import org. springframework. web. servlet. ModelAndView ; import javax. servlet. http. HttpServletRequest ;
import javax. servlet. http. HttpServletResponse ; public class MyInterceptor1 implements HandlerInterceptor { @Override public boolean preHandle ( HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System . out. println ( "preHandle1...." ) ; return true ; } @Override public void postHandle ( HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System . out. println ( "postHandle1...." ) ; } @Override public void afterCompletion ( HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System . out. println ( "afterCompletion1...." ) ; }
} package com. Interceptor ; import org. springframework. web. servlet. HandlerInterceptor ;
import org. springframework. web. servlet. ModelAndView ; import javax. servlet. http. HttpServletRequest ;
import javax. servlet. http. HttpServletResponse ; public class MyInterceptor2 implements HandlerInterceptor { @Override public boolean preHandle ( HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System . out. println ( "preHandle2...." ) ; return true ; } @Override public void postHandle ( HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System . out. println ( "postHandle2...." ) ; } @Override public void afterCompletion ( HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System . out. println ( "afterCompletion2...." ) ; }
}
< mvc: interceptors> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor1" > </ bean> </ mvc: interceptor> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor2" > </ bean> </ mvc: interceptor> </ mvc: interceptors> < beanid = " viewResolver" class = " org.springframework.web.servlet.view.InternalResourceViewResolver" > < propertyname = " prefix" value = " /" > </ property> < propertyname = " suffix" value = " .jsp" > </ property> </ bean> @RequestMapping ( "ix" ) public String ix ( String a, Integer b) throws IOException { return "test" ; }
< mvc: interceptors> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor2" > </ bean> </ mvc: interceptor> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor1" > </ bean> </ mvc: interceptor> </ mvc: interceptors>
package com. Interceptor ; import org. springframework. web. servlet. HandlerInterceptor ;
import org. springframework. web. servlet. ModelAndView ; import javax. servlet. http. HttpServletRequest ;
import javax. servlet. http. HttpServletResponse ; public class MyInterceptor3 implements HandlerInterceptor { @Override public boolean preHandle ( HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System . out. println ( "preHandle3...." ) ; return false ; } @Override public void postHandle ( HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System . out. println ( "postHandle3...." ) ; } @Override public void afterCompletion ( HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System . out. println ( "afterCompletion3...." ) ; }
}
< mvc: interceptors> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor1" > </ bean> </ mvc: interceptor> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor3" > </ bean> </ mvc: interceptor> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor2" > </ bean> </ mvc: interceptor> </ mvc: interceptors>
< mvc: interceptors> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor1" > </ bean> </ mvc: interceptor> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor2" > </ bean> </ mvc: interceptor> < mvc: interceptor> < mvc: mappingpath = " /**" /> < beanclass = " com.Interceptor.MyInterceptor3" > </ bean> </ mvc: interceptor> </ mvc: interceptors>
< dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> < beanid = " multipartResolver" class = " org.springframework.web.multipart.commons.CommonsMultipartResolver" > < propertyname = " maxUploadSize" value = " 1000000000" /> </ bean> <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
<form method="post" enctype="multipart/form-data" action="demo/upload"><input type="file" name="uploadFile"/><input type="submit" value="上传"/>
</form>
</body>
</html>package com. controller ; import org. springframework. stereotype. Controller ;
import org. springframework. web. bind. annotation. RequestMapping ;
import org. springframework. web. multipart. MultipartFile ; import javax. servlet. http. HttpServletRequest ;
import java. io. File ;
import java. io. IOException ;
import java. text. SimpleDateFormat ;
import java. util. Date ;
import java. util. UUID ; @Controller
@RequestMapping ( "/demo" )
public class FileController { @RequestMapping ( "upload" ) public String upload ( MultipartFile uploadFile, HttpServletRequest request) throws IOException { String originalFilename = uploadFile. getOriginalFilename ( ) ; String extendName = originalFilename. substring ( originalFilename. lastIndexOf ( "." ) + 1 , originalFilename. length ( ) ) ; String uuid = UUID . randomUUID ( ) . toString ( ) ; String newName = uuid + "." + extendName; String realPath = request. getSession ( ) . getServletContext ( ) . getRealPath ( "/" ) ; System . out. println ( realPath) ; String datePath = new SimpleDateFormat ( "yyyy-MM-dd" ) . format ( new Date ( ) ) ; File floder = new File ( realPath + "/" + datePath) ; if ( ! floder. exists ( ) ) { floder. mkdirs ( ) ; } uploadFile. transferTo ( new File ( floder, newName) ) ; return "success" ; }
} <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
1
</body>
</html>
<?xml version="1.0" encoding="UTF-8"?>
< web-appxmlns = " http://xmlns.jcp.org/xml/ns/javaee" xmlns: xsi= " http://www.w3.org/2001/XMLSchema-instance" xsi: schemaLocation= " http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version = " 4.0" > < servlet> < servlet-name> </ servlet-name> < servlet-class> </ servlet-class> </ servlet> < servlet-mapping> < servlet-name> </ servlet-name> < url-pattern> </ url-pattern> </ servlet-mapping> </ web-app> @Override public void service ( ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException , IOException { String realPath = servletRequest. getServletContext ( ) . getRealPath ( "/" ) ; System . out. println ( realPath) ; }
F : \xianmu\out\artifacts\xianmu_Web_exploded\
C : \Users \33988 \AppData \Local \JetBrains \IntelliJIdea2021 .3 \tomcat\062 b022d- 1657 - 4d 8 b- b4e9- da3eeae3d227\conf\Catalina \localhost
<?xml version="1.0" encoding="UTF-8"?>
< projectxmlns = " http://maven.apache.org/POM/4.0.0" xmlns: xsi= " http://www.w3.org/2001/XMLSchema-instance" xsi: schemaLocation= " http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" > < modelVersion> </ modelVersion> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> < properties> < maven.compiler.source> </ maven.compiler.source> < maven.compiler.target> </ maven.compiler.target> </ properties> </ project>
< packaging> </ packaging>
< dependencies> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> < scope> </ scope> </ dependency> </ dependencies>
< Contextpath = " /maven" docBase = " F:\maven\target\maven-1.0-SNAPSHOT.war" /> F : \Program Files \apache- tomcat- 8.5 .50 \webapps\maven\
< Contextpath = " /maven" docBase = " F:\maven\target\maven-1.0-SNAPSHOT" /> F:\maven\target\maven-1.0-SNAPSHOT\
<Context path="/xianmu" docBase="F:\xianmu\out\artifacts\xianmu_Web_exploded" />
F:\xianmu\out\artifacts\xianmu_Web_exploded\
String realPath = servletRequest. getServletContext ( ) . getRealPath ( "/" ) ;
String realPath = servletRequest. getServletContext ( ) . getRealPath ( "" ) ;
package com. controller ; import org. springframework. stereotype. Controller ;
import org. springframework. web. bind. annotation. RequestMapping ;
import org. springframework. web. multipart. MultipartFile ; import javax. servlet. http. HttpServletRequest ;
import java. io. File ;
import java. io. IOException ;
import java. text. SimpleDateFormat ;
import java. util. Date ;
import java. util. UUID ; @Controller
@RequestMapping ( "/demo" )
public class FileController { @RequestMapping ( "upload" ) public String upload ( MultipartFile uploadFile, HttpServletRequest request) throws IOException { String originalFilename = uploadFile. getOriginalFilename ( ) ; String extendName = originalFilename. substring ( originalFilename. lastIndexOf ( "." ) + 1 , originalFilename. length ( ) ) ; String uuid = UUID . randomUUID ( ) . toString ( ) ; String newName = uuid + "." + extendName; String realPath = request. getSession ( ) . getServletContext ( ) . getRealPath ( "/" ) ; System . out. println ( realPath) ; String datePath = new SimpleDateFormat ( "yyyy-MM-dd" ) . format ( new Date ( ) ) ; File floder = new File ( realPath + "/" + datePath) ; if ( ! floder. exists ( ) ) { floder. mkdirs ( ) ; } uploadFile. transferTo ( new File ( floder, newName) ) ; return "success" ; }
}
package com. controller ; import org. springframework. stereotype. Controller ;
import org. springframework. web. bind. annotation. ControllerAdvice ;
import org. springframework. web. bind. annotation. ExceptionHandler ;
import org. springframework. web. bind. annotation. RequestMapping ;
import org. springframework. web. servlet. ModelAndView ; import javax. servlet. http. HttpServletResponse ;
import java. io. IOException ;
@Controller
public class GlobalExceptionResolver { @ExceptionHandler ( ArithmeticException . class ) public ModelAndView handleException ( ArithmeticException exception, HttpServletResponse response) { ModelAndView modelAndView = new ModelAndView ( ) ; modelAndView. addObject ( "msg" , exception. getMessage ( ) ) ; modelAndView. setViewName ( "error" ) ; return modelAndView; } @RequestMapping ( "err" ) public String ix ( String a, Integer b) throws IOException { System . out. println ( 1 ) ; int i = 1 / 0 ; return "err" ; }
} <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
错误是：${msg}
</body>
</html>modelAndView. addObject ( "msg" , exception. getMessage ( ) ) ;
modelAndView. setViewName ( "error" ) ;
@ExceptionHandler ( ArithmeticException . class ) public ModelAndView handleException ( ArithmeticException exception, HttpServletResponse response) { ModelAndView modelAndView = new ModelAndView ( ) ; modelAndView. addObject ( "msg" , exception. getMessage ( ) ) ; modelAndView. setViewName ( "error" ) ; return modelAndView; } @ExceptionHandler ( ArithmeticException . class ) public ModelAndView handleException1 ( ArithmeticException exception, HttpServletResponse response) { ModelAndView modelAndView = new ModelAndView ( ) ; modelAndView. addObject ( "msg" , exception. getMessage ( ) + "22" ) ; modelAndView. setViewName ( "error" ) ; return modelAndView; }
package com. controller ; import org. springframework. stereotype. Controller ;
import org. springframework. web. bind. annotation. ExceptionHandler ;
import org. springframework. web. servlet. ModelAndView ; import javax. servlet. http. HttpServletResponse ; @Controller
public class Global { @ExceptionHandler ( ArithmeticException . class ) public ModelAndView handleException ( ArithmeticException exception, HttpServletResponse response) { ModelAndView modelAndView = new ModelAndView ( ) ; modelAndView. addObject ( "msg" , exception. getMessage ( ) ) ; modelAndView. setViewName ( "error" ) ; return modelAndView; }
} package com. controller ; import org. springframework. stereotype. Controller ;
import org. springframework. web. bind. annotation. ControllerAdvice ;
import org. springframework. web. bind. annotation. ExceptionHandler ;
import org. springframework. web. servlet. ModelAndView ; import javax. servlet. http. HttpServletResponse ; @ControllerAdvice
@Controller
public class Global { @ExceptionHandler ( ArithmeticException . class ) public ModelAndView handleException ( ArithmeticException exception, HttpServletResponse response) { ModelAndView modelAndView = new ModelAndView ( ) ; modelAndView. addObject ( "msg" , exception. getMessage ( ) ) ; modelAndView. setViewName ( "error" ) ; return modelAndView; }
}
package com. controller ; import org. springframework. stereotype. Controller ;
import org. springframework. web. bind. annotation. RequestMapping ; @Controller
public class Redirect { @RequestMapping ( "/re" ) public String re ( ) { return "redirect:ree?name=" + 1 ;
} @RequestMapping ( "/ree" ) public String ree ( String name) { System . out. println ( name) ; System . out. println ( 1 ) ; return "ree" ; }
} @RequestMapping ( "/reee" ) public String reee ( RedirectAttributes redirectAttributes, HttpSession session) { redirectAttributes. addFlashAttribute ( "name" , "22" ) ; Object name = session. getAttribute ( "name" ) ; System . out. println ( name) ; return "redirect:reeee?name=" + 1 ; } @RequestMapping ( "/reeee" )
public String reeee ( String name, HttpSession session, @ModelAttribute ( "name" ) String na, ModelAndView modelAndView) { System . out. println ( modelAndView) ; System . out. println ( na) ; String name2 = ( String ) session. getAttribute ( "name" ) ; System . out. println ( name2) ; System . out. println ( 44444444 ) ; System . out. println ( name) ; Object name1 = session. getAttribute ( "name" ) ; System . out. println ( name1) ; return "ree" ; }
< web-app> </ web-app> < dependencies> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> < scope> </ scope> </ dependency> </ dependencies> package com. mvc. framework ; import javax. servlet. http. HttpServlet ;
public class DispatcherServlet extends HttpServlet {
} <?xml version="1.0" encoding="UTF-8"?>
< web-appxmlns = " http://xmlns.jcp.org/xml/ns/javaee" xmlns: xsi= " http://www.w3.org/2001/XMLSchema-instance" xsi: schemaLocation= " http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version = " 4.0" > < display-name> </ display-name> < servlet> < servlet-name> </ servlet-name> < servlet-class> </ servlet-class> </ servlet> < servlet-mapping> < servlet-name> </ servlet-name> < url-pattern> </ url-pattern> </ servlet-mapping> </ web-app> package com. mvc. framework. annotations ; import java. lang. annotation. * ; @Documented
@Target ( ElementType . TYPE )
@Retention ( RetentionPolicy . RUNTIME )
public @interface Controller { String value ( ) default "" ;
} package com. mvc. framework. annotations ; import java. lang. annotation. * ; @Documented
@Target ( ElementType . TYPE )
@Retention ( RetentionPolicy . RUNTIME )
public @interface Service { String value ( ) default "" ;
} package com. mvc. framework. annotations ; import java. lang. annotation. * ; @Documented
@Target ( { ElementType . TYPE , ElementType . METHOD } )
@Retention ( RetentionPolicy . RUNTIME )
public @interface RequestMapping { String value ( ) default "" ;
} package com. mvc. framework. annotations ; import java. lang. annotation. * ; @Documented
@Target ( ElementType . FIELD )
@Retention ( RetentionPolicy . RUNTIME )
public @interface Autowired { String value ( ) default "" ;
} package com. mvc. framework. service ; public interface DemoService { String get ( String name) ;
} package com. mvc. framework. service. impl ; import com. mvc. framework. service. DemoService ; public class DemoServiceImpl implements DemoService { @Override public String get ( String name) { System . out. println ( "打印：" + name) ; return name; }
} package com. mvc. framework. servlet ; import javax. servlet. ServletException ;
import javax. servlet. http. HttpServlet ;
import javax. servlet. http. HttpServletRequest ;
import javax. servlet. http. HttpServletResponse ;
import java. io. IOException ;
public class DispatcherServlet extends HttpServlet { @Override public void init ( ServletConfig config) throws ServletException { } @Override protected void doGet ( HttpServletRequest req, HttpServletResponse resp) throws ServletException , IOException { doPost ( req, resp) ; } @Override protected void doPost ( HttpServletRequest req, HttpServletResponse resp) throws ServletException , IOException { }
} @Override public void init ( ServletConfig config) throws ServletException { }
< beans> < component-scanbase-package = " com.mvc.framework" /> </ beans> <?xml version="1.0" encoding="UTF-8"?>
< web-appxmlns = " http://xmlns.jcp.org/xml/ns/javaee" xmlns: xsi= " http://www.w3.org/2001/XMLSchema-instance" xsi: schemaLocation= " http://xmlns.jcp.org/xml/ns/javaeehttp://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version = " 4.0" > < display-name> </ display-name> < servlet> < servlet-name> </ servlet-name> < servlet-class> </ servlet-class> < init-param> < param-name> </ param-name> < param-value> </ param-value> </ init-param> </ servlet> < servlet-mapping> < servlet-name> </ servlet-name> < url-pattern> </ url-pattern> </ servlet-mapping> </ web-app> package com. mvc. framework. servlet ; import javax. servlet. ServletConfig ;
import javax. servlet. ServletException ;
import javax. servlet. http. HttpServlet ;
import javax. servlet. http. HttpServletRequest ;
import javax. servlet. http. HttpServletResponse ;
import java. io. IOException ;
public class DispatcherServlet extends HttpServlet { @Override public void init ( ServletConfig config) throws ServletException { String contextConfigLocation = config. getInitParameter ( "contextConfigLocation" ) ; String s = doLoadconfig ( contextConfigLocation) ; doScan ( s) ; doInstance ( ) ; doAutoWired ( ) ; initHandlerMapping ( ) ; System . out. println ( "初始化完成...，等待请求与映射匹配了" ) ; } private void initHandlerMapping ( ) { } private void doAutoWired ( ) { } private void doInstance ( ) { } private void doScan ( String path) { } private String doLoadconfig ( String contextConfigLocation) { return "" ; } @Override protected void doGet ( HttpServletRequest req, HttpServletResponse resp) throws ServletException , IOException { doPost ( req, resp) ; } @Override protected void doPost ( HttpServletRequest req, HttpServletResponse resp) throws ServletException , IOException { }
} < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> package com. mvc. framework. controller ; import com. mvc. framework. annotations. Autowired ;
import com. mvc. framework. annotations. Controller ;
import com. mvc. framework. annotations. RequestMapping ;
import com. mvc. framework. service. DemoService ; import javax. servlet. http. HttpServletRequest ;
import javax. servlet. http. HttpServletResponse ; @Controller
@RequestMapping ( "/demo" )
public class DemoController { @Autowired private DemoService demoService; @RequestMapping ( "/query" ) public String query ( HttpServletRequest request, HttpServletResponse response, String name) { String s = demoService. get ( name) ; return s; } } package com. mvc. framework. servlet ; import com. mvc. framework. annotations. Autowired ;
import com. mvc. framework. annotations. Controller ;
import com. mvc. framework. annotations. RequestMapping ;
import com. mvc. framework. annotations. Service ;
import org. dom4j. Document ;
import org. dom4j. Element ;
import org. dom4j. io. SAXReader ; import javax. servlet. ServletConfig ;
import javax. servlet. ServletException ;
import javax. servlet. http. HttpServlet ;
import javax. servlet. http. HttpServletRequest ;
import javax. servlet. http. HttpServletResponse ;
import java. io. File ;
import java. io. IOException ;
import java. io. InputStream ;
import java. lang. reflect. Field ;
import java. lang. reflect. Method ;
import java. net. URLDecoder ;
import java. nio. charset. StandardCharsets ;
import java. util. ArrayList ;
import java. util. HashMap ;
import java. util. List ;
import java. util. Map ;
public class DispatcherServlet extends HttpServlet { private static List < String > = new ArrayList < > ( ) ; private static Map < String , Object > = new HashMap < > ( ) ; private static List < String > = new ArrayList < > ( ) ; private static Map < String , Method > = new HashMap < > ( ) ; @Override public void init ( ServletConfig config) { String contextConfigLocation = config. getInitParameter ( "contextConfigLocation" ) ; String s = doLoadconfig ( contextConfigLocation) ; doScan ( s) ; doInstance ( ) ; doAutoWired ( ) ; initHandlerMapping ( ) ; System . out. println ( "初始化完成...，等待请求与映射匹配了" ) ; } private void initHandlerMapping ( ) { if ( map. isEmpty ( ) ) { return ; } for ( Map. Entry < String , Object > : map. entrySet ( ) ) { Class < ? > = entry. getValue ( ) . getClass ( ) ; if ( aClass. isAnnotationPresent ( Controller . class ) ) { String baseUrl = "" ; if ( aClass. isAnnotationPresent ( RequestMapping . class ) ) { String value = aClass. getAnnotation ( RequestMapping . class ) . value ( ) ; baseUrl += value; } Method [ ] methods = aClass. getMethods ( ) ; for ( int j = 0 ; j < methods. length; j++ ) { Method method = methods[ j] ; if ( method. isAnnotationPresent ( RequestMapping . class ) ) { RequestMapping annotation = method. getAnnotation ( RequestMapping . class ) ; String value = annotation. value ( ) ; String url = baseUrl; url += value; handlerMapping. put ( url, method) ; } } } } } private void doAutoWired ( ) { if ( map. isEmpty ( ) ) { return ; } for ( Map. Entry < String , Object > : map. entrySet ( ) ) { try { doObjectDependancy ( entry. getValue ( ) ) ; } catch ( Exception e) { e. printStackTrace ( ) ; } } } private static void doObjectDependancy ( Object object) { Field [ ] declaredFields = object. getClass ( ) . getDeclaredFields ( ) ; if ( declaredFields == null || declaredFields. length == 0 ) { return ; } for ( int i = 0 ; i < declaredFields. length; i++ ) { Field declaredField = declaredFields[ i] ; if ( ! declaredField. isAnnotationPresent ( Autowired . class ) ) { continue ; } if ( fieldsAlreayProcessed. contains ( object. getClass ( ) . getName ( ) + "." + declaredField. getName ( ) ) ) { continue ; } Object dependObject = null ; Autowired annotation = declaredField. getAnnotation ( Autowired . class ) ; String value = annotation. value ( ) ; if ( "" . equals ( value. trim ( ) ) ) { dependObject = map. get ( declaredField. getType ( ) . getName ( ) ) ; if ( dependObject == null ) { dependObject = map. get ( lowerFirst ( declaredField. getType ( ) . getSimpleName ( ) ) ) ; } } else { dependObject = map. get ( value+ declaredField. getType ( ) . getName ( ) ) ; } fieldsAlreayProcessed. add ( object. getClass ( ) . getName ( ) + "." + declaredField. getName ( ) ) ; if ( dependObject != null ) { doObjectDependancy ( dependObject) ; } declaredField. setAccessible ( true ) ; try { declaredField. set ( object, dependObject) ; } catch ( Exception e) { e. printStackTrace ( ) ; } } } private void doInstance ( ) { if ( classNames. size ( ) == 0 ) return ; if ( classNames. size ( ) <= 0 ) return ; try { for ( int i = 0 ; i < classNames. size ( ) ; i++ ) { String className = classNames. get ( i) ; Class < ? > = Class . forName ( className) ; if ( aClass. isAnnotationPresent ( Controller . class ) ) { String simpleName = aClass. getSimpleName ( ) ; String s = lowerFirst ( simpleName) ; Object o = aClass. newInstance ( ) ; map. put ( s, o) ; } if ( aClass. isAnnotationPresent ( Service . class ) ) { String beanName = aClass. getAnnotation ( Service . class ) . value ( ) ; Object o = aClass. newInstance ( ) ; int ju = 0 ; if ( "" . equals ( beanName. trim ( ) ) ) { beanName = lowerFirst ( aClass. getSimpleName ( ) ) ; } else { ju= 1 ; } if ( ju== 1 ) { UtilGetClassInterfaces . getkeyClass ( beanName, aClass, map, o) ; } else { map. put ( beanName, o) ; } Class < ? > [ ] interfaces = aClass. getInterfaces ( ) ; if ( interfaces != null && interfaces. length > 0 ) { for ( int j = 0 ; j < interfaces. length; j++ ) { Class < ? > = interfaces[ j] ; map. put ( anInterface. getName ( ) , aClass. newInstance ( ) ) ; } } } } } catch ( Exception e) { e. printStackTrace ( ) ; } } private static String lowerFirst ( String str) { char [ ] chars = str. toCharArray ( ) ; if ( 'A' <= chars[ 0 ] && chars[ 0 ] <= 'Z' ) { chars[ 0 ] += 32 ; } return String . valueOf ( chars) ; } private void doScan ( String scanPackage) { try { String scanPackagePath = Thread . currentThread ( ) . getContextClassLoader ( ) . getResource ( "" ) . getPath ( ) + scanPackage. replaceAll ( "\\." , "/" ) ; scanPackagePath = URLDecoder . decode ( scanPackagePath, StandardCharsets . UTF_8 . toString ( ) ) ; File pack = new File ( scanPackagePath) ; File [ ] files = pack. listFiles ( ) ; for ( File file : files) { if ( file. isDirectory ( ) ) { doScan ( scanPackage + "." + file. getName ( ) ) ; continue ; } if ( file. getName ( ) . endsWith ( ".class" ) ) { String className = scanPackage + "." + file. getName ( ) . replaceAll ( ".class" , "" ) ; classNames. add ( className) ; } } } catch ( Exception e) { e. printStackTrace ( ) ; } } private String doLoadconfig ( String contextConfigLocation) { InputStream resourceAsStream = DispatcherServlet . class . getClassLoader ( ) . getResourceAsStream ( contextConfigLocation) ; SAXReader saxReader = new SAXReader ( ) ; try { Document document = saxReader. read ( resourceAsStream) ; Element rootElement = document. getRootElement ( ) ; Element element = ( Element ) rootElement. selectSingleNode ( "//component-scan" ) ; String attribute = element. attributeValue ( "base-package" ) ; return attribute; } catch ( Exception e) { e. printStackTrace ( ) ; } return "" ; } @Override protected void doGet ( HttpServletRequest req, HttpServletResponse resp) throws ServletException , IOException { doPost ( req, resp) ; } @Override protected void doPost ( HttpServletRequest req, HttpServletResponse resp) throws ServletException , IOException { System . out. println ( "请求资源的路径为：" + req. getRequestURI ( ) ) ; System . out. println ( "请求资源的完整路径为：" + req. getRequestURL ( ) ) ; String requestURI = req. getRequestURI ( ) ; Method method = handlerMapping. get ( requestURI) ; }
} package com. mvc. framework. servlet ; public class a extends b implements f { public static void main ( String [ ] args) { getkeyClass ( a. class ) ; } private static void getkeyClass ( Class a) { Class superclass = a. getSuperclass ( ) ; if ( "java.lang.Object" . equals ( superclass. getName ( ) ) ) { System . out. println ( a. getName ( ) ) ; } else { System . out. println ( a. getName ( ) ) ; getkeyClass ( superclass) ; } Class [ ] interfaces = a. getInterfaces ( ) ; for ( Class anInterface : interfaces) { getkeyInterface ( anInterface) ; } } private static void getkeyInterface ( Class a) { Class [ ] interfaces1 = a. getInterfaces ( ) ; if ( interfaces1. length <= 0 ) { System . out. println ( a. getName ( ) ) ; return ; } System . out. println ( a. getName ( ) ) ; Class aClass = interfaces1[ 0 ] ; getkeyInterface ( aClass) ; }
} package com. mvc. framework. servlet ; public class b implements c{
} package com. mvc. framework. servlet ; public interface c extends d{
} package com. mvc. framework. servlet ; public interface d {
} package com. mvc. framework. servlet ; public interface f extends g{
} package com. mvc. framework. servlet ; public interface g {
}
dependObject = map. get ( value+ declaredField. getType ( ) . getName ( ) ) ; package com. mvc. framework. util ; import java. util. Map ; public class UtilGetClassInterfaces { public static void getkeyClass ( String beanName, Class a, Map map, Object o) { Class superclass = a. getSuperclass ( ) ; if ( "java.lang.Object" . equals ( superclass. getName ( ) ) ) { map. put ( beanName + a. getName ( ) , o) ; } else { map. put ( beanName + a. getName ( ) , o) ; getkeyClass ( beanName, superclass, map, o) ; } Class [ ] interfaces = a. getInterfaces ( ) ; for ( Class anInterface : interfaces) { getkeyInterface ( beanName, anInterface, map, o) ; } } private static void getkeyInterface ( String beanName, Class a, Map map, Object o) { Class [ ] interfaces1 = a. getInterfaces ( ) ; if ( interfaces1. length <= 0 ) { map. put ( beanName + a. getName ( ) , o) ; return ; } map. put ( beanName + a. getName ( ) , o) ; Class aClass = interfaces1[ 0 ] ; getkeyInterface ( beanName, aClass, map, o) ; } } if ( ju== 1 ) { UtilGetClassInterfaces . getkeyClass ( beanName, aClass, map, o) ; } else { map. put ( beanName, o) ; }
String requestURI = req. getRequestURI ( ) ; String contextPath = req. getContextPath ( ) ; System . out. println ( "项目名称：" + contextPath) ; String substring = requestURI. substring ( contextPath. length ( ) , requestURI. length ( ) ) ; System . out. println ( "拿取的路径：" + substring) ; Method method = handlerMapping. get ( substring) ;
String value = aClass. getAnnotation ( RequestMapping . class ) . value ( ) ; if ( "/" . equals ( value. substring ( 0 , 1 ) ) == false ) { value = "/" + value; }
String value = annotation. value ( ) ; if ( "/" . equals ( value. substring ( 0 , 1 ) ) == false ) { value = "/" + value; }
package com. mvc. framework. servlet ; import java. lang. reflect. Method ; public class a { public void fa ( String a, Integer b) { System . out. println ( 1 + a + b) ; } public void fb ( ) { System . out. println ( 1 ) ; } public static void main ( String [ ] args) { try { Class < a> = a. class ; a a = aClass. newInstance ( ) ; Method [ ] methods = aClass. getMethods ( ) ; for ( int i = 0 ; i < methods. length; i++ ) { System . out. println ( methods[ i] . getName ( ) ) ; } Method fa = aClass. getMethod ( "fb" ) ; fa. invoke ( a) ; Method fb = aClass. getMethod ( "fa" , String . class , Integer . class ) ; fb. invoke ( a, "2" , 1 ) ; } catch ( Exception e) { e. printStackTrace ( ) ; } }
}
package com. mvc. framework. pojo ; import java. lang. reflect. Method ;
import java. util. HashMap ;
import java. util. Map ;
import java. util. regex. Pattern ; public class Handler { private Object controller; private Method method; private Pattern pattern; private Map < String , Integer > ; public Handler ( Object controller, Method method, Pattern pattern) { this . controller = controller; this . method = method; this . pattern = pattern; this . paramIndexMapping = new HashMap < > ( ) ; } public Object getController ( ) { return controller; } public void setController ( Object controller) { this . controller = controller; } public Method getMethod ( ) { return method; } public void setMethod ( Method method) { this . method = method; } public Pattern getPattern ( ) { return pattern; } public void setPattern ( Pattern pattern) { this . pattern = pattern; } public Map < String , Integer > getParamIndexMapping ( ) { return paramIndexMapping; } public void setParamIndexMapping ( Map < String , Integer > ) { this . paramIndexMapping = paramIndexMapping; }
} private List < Handler > = new ArrayList < > ( ) ;
package com. mvc. framework. servlet ; import java. util. regex. Matcher ;
import java. util. regex. Pattern ; public class a { public static void main ( String [ ] args) { String a = "[0-9]{3}" ; String b = "122" ; CharSequence aa = b; System . out. println ( b. matches ( a) ) ; Pattern pattern = Pattern . compile ( "[0-9]{3}" ) ; Matcher m = pattern. matcher ( "122" ) ; boolean matches = m. matches ( ) ; System . out. println ( matches) ; System . out. println ( pattern) ; }
}
if ( method. isAnnotationPresent ( RequestMapping . class ) ) { RequestMapping annotation = method. getAnnotation ( RequestMapping . class ) ; String value = annotation. value ( ) ; if ( "/" . equals ( value. substring ( 0 , 1 ) ) == false ) { value = "/" + value; } String url = baseUrl; url += value; Handler handler = new Handler ( entry. getValue ( ) , method, Pattern . compile ( url) ) ; Parameter [ ] parameters = method. getParameters ( ) ; for ( int i = 0 ; i < parameters. length; i++ ) { Parameter parameter = parameters[ i] ; if ( parameter. getType ( ) == HttpServletRequest . class || parameter. getType ( ) == HttpServletResponse . class ) { handler. getParamIndexMapping ( ) . put ( parameter. getType ( ) . getSimpleName ( ) , i) ; } else { handler. getParamIndexMapping ( ) . put ( parameter. getName ( ) , i) ; } } handlerMapping. add ( handler) ; }
package com. mvc. framework. servlet ; import java. lang. reflect. Method ; public class a { public void fa ( String a, Integer b, int j) { } public static void main ( String [ ] args) throws Exception { Class < a> = a. class ; Method fa = aClass. getMethod ( "fa" , String . class , Integer . class , int . class ) ; Class < ? > [ ] parameterTypes = fa. getParameterTypes ( ) ; for ( int i = 0 ; i < parameterTypes. length; i++ ) { Class < ? > = parameterTypes[ i] ; System . out. println ( parameterType. getSimpleName ( ) ) ; } }
} @Override protected void doPost ( HttpServletRequest req, HttpServletResponse resp) throws ServletException , IOException { Handler handler = getHandler ( req) ; if ( handler == null ) { resp. getWriter ( ) . write ( "404 not found" ) ; return ; } Class < ? > [ ] parameterTypes = handler. getMethod ( ) . getParameterTypes ( ) ; Object [ ] objects = new Object [ parameterTypes. length] ; int [ ] ii = new int [ parameterTypes. length] ; Map < String , String [ ] > parameterMap = req. getParameterMap ( ) ; Set < Map. Entry < String , String [ ] >> entries = parameterMap. entrySet ( ) ; for ( Map. Entry < String , String [ ] > param : entries) { String value = "" ; for ( int i = 0 ; i < param. getValue ( ) . length; i++ ) { if ( i >= param. getValue ( ) . length - 1 ) { value = param. getValue ( ) [ i] ; continue ; } value = param. getValue ( ) [ i] + "," ; } if ( ! handler. getParamIndexMapping ( ) . containsKey ( param. getKey ( ) ) ) { continue ; } Integer integer = handler. getParamIndexMapping ( ) . get ( param. getKey ( ) ) ; if ( "String" . equals ( parameterTypes[ integer] . getSimpleName ( ) ) ) { objects[ integer] = value; } if ( "Integer" . equals ( parameterTypes[ integer] . getSimpleName ( ) ) || "int" . equals ( parameterTypes[ integer] . getSimpleName ( ) ) ) { value = value. split ( "," ) [ 0 ] ; Integer i = null ; try { i = Integer . parseInt ( value) ; } catch ( Exception e) { e. printStackTrace ( ) ; throw new RuntimeException ( "String转换Integet报错，参数名称是：" + param. getKey ( ) ) ; } objects[ integer] = i; } ii[ integer] = 1 ; } Integer integer = handler. getParamIndexMapping ( ) . get ( HttpServletRequest . class . getSimpleName ( ) ) ; objects[ integer] = req; ii[ integer] = 1 ; integer = handler. getParamIndexMapping ( ) . get ( HttpServletResponse . class . getSimpleName ( ) ) ; objects[ integer] = resp; ii[ integer] = 1 ; for ( int i = 0 ; i < ii. length; i++ ) { if ( ii[ i] == 0 ) { if ( "int" . equals ( parameterTypes[ i] . getSimpleName ( ) ) ) { objects[ i] = 0 ; } } } try { handler. getMethod ( ) . invoke ( handler. getController ( ) , objects) ; } catch ( Exception e) { e. printStackTrace ( ) ; } } private Handler getHandler ( HttpServletRequest req) { if ( handlerMapping. isEmpty ( ) ) { return null ; } String requestURI = req. getRequestURI ( ) ; String contextPath = req. getContextPath ( ) ; String substring = requestURI. substring ( contextPath. length ( ) , requestURI. length ( ) ) ; for ( Handler handler : handlerMapping) { Matcher matcher = handler. getPattern ( ) . matcher ( substring) ; if ( ! matcher. matches ( ) ) { continue ; } return handler; } return null ; }
package com. mvc. framework. controller ; import com. mvc. framework. annotations. Autowired ;
import com. mvc. framework. annotations. Controller ;
import com. mvc. framework. annotations. RequestMapping ;
import com. mvc. framework. service. DemoService ; import javax. servlet. http. HttpServletRequest ;
import javax. servlet. http. HttpServletResponse ; @Controller
@RequestMapping ( "/demo" )
public class DemoController { @Autowired private DemoService demoService; @RequestMapping ( "/query" ) public String query ( HttpServletRequest request, HttpServletResponse response, String name) { String s = demoService. get ( name) ; return s; } } @RequestMapping ( "/query" ) public String query ( HttpServletRequest request, HttpServletResponse response, String name) { System . out. println ( request) ; System . out. println ( response) ; String s = demoService. get ( name) ; return s; }
package com. mvc. framework. service. impl ; import com. mvc. framework. annotations. Service ;
import com. mvc. framework. service. DemoService ; @Service
public class DemoServiceImpl implements DemoService { @Override public String get ( String name) { System . out. println ( "打印：" + name) ; return name; }
} if ( parameter. getType ( ) == HttpServletRequest . class || parameter. getType ( ) == HttpServletResponse . class ) { handler. getParamIndexMapping ( ) . put ( parameter. getType ( ) . getSimpleName ( ) , i) ; } else { handler. getParamIndexMapping ( ) . put ( parameter. getName ( ) , i) ; }
package com. mvc. framework. servlet ; import java. lang. reflect. Method ;
import java. lang. reflect. Parameter ; public class a { public void fa ( String nam2, String name1) { } public void fb ( String nam2, String name1) { } public static void main ( String [ ] args) { Class < a> = a. class ; Method [ ] fa = aClass. getMethods ( ) ; for ( int i = 0 ; i < fa. length; i++ ) { Method method = fa[ i] ; System . out. println ( method. getName ( ) ) ; Parameter [ ] parameters = method. getParameters ( ) ; for ( int ii = 0 ; ii < parameters. length; ii++ ) { Parameter parameter = parameters[ ii] ; System . out. println ( parameter. getName ( ) ) ; } } }
} - parameters，编译选项
< build> < plugins> < plugin> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> < configuration> < source> </ source> < target> </ target> < compilerArguments> < parameters/> </ compilerArguments> </ configuration> </ plugin> </ plugins> </ build> spring是使用字节码分析库（如 ASM）来动态分析类文件，而不依赖于编译器生成的字节码，这种技术使 Spring 能够获取参数名称，因为他是直接分析文件的，也就可以说，他内部的代码是相当于跳过了操作了-parameters选项，而访问并处理字节码文件（实际上再怎么处理字节码文件中都会保留原始参数名称，否则的话，也不可能使用该名称的变量了，他只是不让你直接获取即可，那么如果说选项中他-parameters是解决某一个开关导致的不让获取，那么spring是直接从文件找，也自然就跳过了这个开关）
public class ceshi { public static void main ( String [ ] args) { for ( String arg : args) { System . out. println ( arg) ; } }
} < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> < build> < plugins> < plugin> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> < configuration> < source> </ source> < target> </ target> < compilerArguments> < parameters/> </ compilerArguments> </ configuration> </ plugin> </ plugins> </ build> package com. mvc. framework. servlet ; import java. lang. reflect. Method ;
import java. lang. reflect. Parameter ; public class a { public void fa ( String nam2, String name1) { } public void fb ( String nam2, String name1) { } public static void main ( String [ ] args) { Class < a> = a. class ; Method [ ] fa = aClass. getMethods ( ) ; for ( int i = 0 ; i < fa. length; i++ ) { Method method = fa[ i] ; System . out. println ( method. getName ( ) ) ; Parameter [ ] parameters = method. getParameters ( ) ; for ( int ii = 0 ; ii < parameters. length; ii++ ) { Parameter parameter = parameters[ ii] ; System . out. println ( parameter. getName ( ) ) ; } } }
} package com. mvc. framework. config ; import org. objectweb. asm. ClassVisitor ;
import org. objectweb. asm. Label ;
import org. objectweb. asm. MethodVisitor ;
import org. objectweb. asm. Opcodes ; import java. util. HashMap ;
import java. util. Map ; public class ParameterNameVisitor extends ClassVisitor { private String methodName; private Map map; public ParameterNameVisitor ( String methodName) { super ( Opcodes . ASM7 ) ; this . methodName = methodName; } @Override public MethodVisitor visitMethod ( int access, String name, String descriptor, String signature, String [ ] exceptions) { if ( name. equals ( methodName) ) { return new MethodParameterVisitor ( ) ; } return null ; } public Map getParameterNames ( ) { return map; } class MethodParameterVisitor extends MethodVisitor { public MethodParameterVisitor ( ) { super ( Opcodes . ASM7 ) ; } @Override public void visitLocalVariable ( String name, String descriptor, String signature, Label start, Label end, int index) { if ( index >= 0 ) { if ( map == null ) { map = new HashMap < > ( ) ; } map. put ( index - 1 , name) ; } } }
} package com. mvc. framework. config ; import org. objectweb. asm. * ; import java. util. Map ; public class ParameterNameExtractor { public static Map getParameterNames ( String className, String methodName) throws Exception { ClassReader reader = new ClassReader ( className) ; ParameterNameVisitor visitor = new ParameterNameVisitor ( methodName) ; reader. accept ( visitor, 0 ) ; return visitor. getParameterNames ( ) ; }
} package com. mvc. framework. servlet ; import com. mvc. framework. config. ParameterNameExtractor ;
import java. util. Map ; public class a { String name; public a ( String name) { this . name = name; } public a ( String name, String j) { this . name = name; } public void fa ( String nam2, String name1) { } public void fb ( String nam2, String name1) { } public static void main ( String [ ] args) throws Exception { String className = "com.mvc.framework.servlet.a" ; String methodName = "fa" ; Map map = ParameterNameExtractor . getParameterNames ( className, methodName) ; for ( int i = 0 ; i < map. size ( ) ; i++ ) { System . out. println ( "参数列表的位置：" + i + "，名称是: " + map. get ( i) ) ; } methodName = "fb" ; map = ParameterNameExtractor . getParameterNames ( className, methodName) ; for ( int i = 0 ; i < map. size ( ) ; i++ ) { System . out. println ( "参数列表的位置：" + i + "，名称是: " + map. get ( i) ) ; } }
} Map < String , String > = null ; try { prmap = ParameterNameExtractor . getParameterNames ( aClass. getName ( ) , method. getName ( ) ) ; } catch ( Exception e) { e. printStackTrace ( ) ; } Parameter [ ] parameters = method. getParameters ( ) ; for ( int i = 0 ; i < parameters. length; i++ ) { Parameter parameter = parameters[ i] ; if ( parameter. getType ( ) == HttpServletRequest . class || parameter. getType ( ) == HttpServletResponse . class ) { handler. getParamIndexMapping ( ) . put ( parameter. getType ( ) . getSimpleName ( ) , i) ; } else { handler. getParamIndexMapping ( ) . put ( prmap. get ( i) , i) ; } } handlerMapping. add ( handler) ;
package com. mvc. framework. servlet ; import com. mvc. framework. config. ParameterNameExtractor ; import java. util. Map ; public class a { public static void main ( String [ ] args) throws Exception { String className = "com.mvc.framework.controller.DemoController" ; String methodName = "query" ; Map map = ParameterNameExtractor . getParameterNames ( className, methodName) ; for ( int i = 0 ; i < map. size ( ) ; i++ ) { System . out. println ( "参数列表的位置：" + i + "，名称是: " + map. get ( i) ) ; } }
} @Override public void init ( ServletConfig config) { String className = "com.mvc.framework.controller.DemoController" ; String methodName = "query" ; Map map = ParameterNameExtractor . getParameterNames ( className, methodName) ; for ( int i = 0 ; i < map. size ( ) ; i++ ) { System . out. println ( "参数列表的位置：" + i + "，名称是: " + map. get ( i) ) ; } }
public ClassReader ( String className) throws IOException { this ( readStream ( ClassLoader . getSystemResourceAsStream ( className. replace ( '.' , '/' ) + ".class" ) , true ) ) ; } private static byte [ ] readStream ( InputStream inputStream, boolean close) throws IOException { if ( inputStream == null ) { throw new IOException ( "Class not found" ) ; } else { . . .
private void initHandlerMapping ( ServletConfig config) { String ba = aClass. getName ( ) . replace ( '.' , '/' ) + ".class" ; prmap = ParameterNameExtractor . getParameterNames ( config. getServletContext ( ) . getRealPath ( "/" ) + "WEB-INF\\classes\\" + ba, method. getName ( ) ) ; InputStream inputStream = new FileInputStream ( className) ; ClassReader reader = new ClassReader ( inputStream) ;
