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Unit02： Servlet工作原理

news 来源：原创 2024/5/4 8:32:32

　　　　Unit02： Servlet工作原理　　　　

点击注册按钮，返回注册信息

package web;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class RegServlet extends HttpServlet {

    @Override
    protected void service(
        HttpServletRequest req, 
        HttpServletResponse res) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        //1.接收请求数据
        String userName = 
            req.getParameter("userName");
        String pwd = req.getParameter("pwd");
        String sex = req.getParameter("sex");
        String[] interests = 
            req.getParameterValues("interest");
        //处理乱码
        //byte[] bs = userName.getBytes("iso8859-1");
        //userName = new String(bs,"utf-8");
        //2.处理业务逻辑
        System.out.println(userName);
        System.out.println(pwd);
        System.out.println(sex);
        if(interests != null) {
            for(String interest: interests) {
                System.out.println(interest);
            }
        }
        //3.发送响应信息
        res.setContentType("text/html");
        PrintWriter out = res.getWriter();
        out.println("<p>Welcome,"+userName+"</p>");
        out.close();
    }

}

reg.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>注册</title>
</head>
<body>
    <!-- 
        访问路径是书写方式:
        1.完整路径
          http://localhost:8080/servlet2/reg
        2.绝对路径
          /servlet2/reg
           注意:以"/项目名"开头
        3.相对路径
          写出当前访问的资源和将要访问的资源的相对关系.
          当前:/servlet2/reg.html
          目标:/servlet2/reg
     -->
    <form action="reg" method="post">
        <p>
            账号:<input type="text" name="userName"/>
        </p>
        <p>
            密码:<input type="password" name="pwd"/>
        </p>
        <p>
            性别:
            <input type="radio" name="sex" value="M"/>男
            <input type="radio" name="sex" value="F"/>女
        </p>
        <p>
            兴趣:
            <input type="checkbox" name="interest" value="friend"/>社交
            <input type="checkbox" name="interest" value="read"/>阅读
            <input type="checkbox" name="interest" value="game"/>竞技
        </p>
        <p><input type="submit" value="注册"/></p>
    </form>
</body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <display-name>servlet2</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
      <servlet-name>reg</servlet-name>
      <servlet-class>web.RegServlet</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>reg</servlet-name>
      <url-pattern>/reg</url-pattern>
  </servlet-mapping>
  
</web-app>