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springMVC第一天

news 来源：原创 2024/5/9 21:06:20

来看几个例子 , 秒懂 , 很简单

//http://localhost/param5?username=zhangsan&age=18@GetMapping("/param5")public String param5(@RequestParam Map<String,String> map){map.forEach((k,v)->{System.out.println(k+"==>"+v);});return "/index.jsp";}//http://localhost/param4?hobby=zq&hobby=pq&hobby=tq@GetMapping("/param4")public String param4(@RequestParam List<String> hobby){for (String s : hobby) {System.out.println(s);}return "/index.jsp";}//http://localhost/param3?hobby=zq&hobby=pq&hobby=tq@GetMapping("/param3")public String param3(String[] hobby){for (String s : hobby) {System.out.println(s);}return "/index.jsp";}//http://localhost/param2?username=zhangsan&age=18@GetMapping("/param2")public String param2(@RequestParam(value="username",required = false,defaultValue = "haohao") String name, Integer age){System.out.println(name+"===="+age);return "/index.jsp";}//http://localhost/param1?username=zhangsan&age=18@RequestMapping("/param1")public String param1(String username,int age){System.out.println(username+"===="+age);return "/index.jsp";}

来看第二种方式

用一个user类封装信息 , 很方便 ,(SpringMVC容器已经帮我们把User对象创建了)

    //http://localhost/param6?username=zhangsan&age=18&hobbies=zq&hobbies=pq&birthday=2018/11/11&address.city=tj&address.area=bh@GetMapping("/param6")public String param6(User user){System.out.println(user);return "/index.jsp";}

3.传递json数据

第一步、导入json坐标

    <dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version></dependency>

第二步 ,在springmvc.xml配置文件导入配置

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"><property name="messageConverters"><list><bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/></list></property></bean>

第三步 .配置映射路径及方法资源

  //http://localhost/param9@PostMapping("/param9")public String param9(@RequestBody User user) throws JsonProcessingException {System.out.println(user);return "/index.jsp";}