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（二）SpringMVC控制器

第一节：@RequestMapping请求映射

第二节：@RequestParam请求参数

第三节：ModelAndView返回模型和视图

第四节：SpringMVC对象属性自动封装

第五节：SpringMVC POST请求乱码解决

第六节：Controller内部转发和重定向

第七节：SpringMVC对ServletAPI的支持

第八节：SpringMVC对JSON的支持

第一节：@RequestMapping请求映射

第二节：@RequestParam请求参数

第三节：ModelAndView返回模型和视图

例子：

index.jsp：

1 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
2     pageEncoding="ISO-8859-1"%>
3 <% response.sendRedirect("student/list.do"); %>

web.xml:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xmlns="http://java.sun.com/xml/ns/javaee"
 4     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 5     id="WebApp_ID" version="2.5">
 6     <display-name>SpringMvc01</display-name>
 7     <welcome-file-list>
 8         <welcome-file>index.jsp</welcome-file>
 9     </welcome-file-list>
10 
11     <servlet>    
12         <servlet-name>springmvc</servlet-name>
13         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
14         <init-param>
15             <param-name>contextConfigLocation</param-name>
16             <param-value>classpath:spring-mvc.xml</param-value>
17         </init-param>
18     </servlet>
19     <servlet-mapping>
20         <servlet-name>springmvc</servlet-name>
21         <url-pattern>*.do</url-pattern>
22     </servlet-mapping>
23 </web-app>

spring-mvc.xml:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:p="http://www.springframework.org/schema/p"
 5     xmlns:context="http://www.springframework.org/schema/context"
 6     xsi:schemaLocation="
 7         http://www.springframework.org/schema/beans
 8         http://www.springframework.org/schema/beans/spring-beans.xsd
 9         http://www.springframework.org/schema/context
10         http://www.springframework.org/schema/context/spring-context.xsd">
11 
12     <!-- 使用注解的包，包括子集 -->
13     <context:component-scan base-package="com.wishwzp"/>
14 
15     <!-- 视图解析器 -->
16     <bean id="viewResolver"
17         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
18         <property name="prefix" value="/WEB-INF/jsp/" />
19         <property name="suffix" value=".jsp"></property>
20     </bean>
21 
22 </beans>

StudentController.java:

 1 package com.wishwzp.controller;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 import org.springframework.stereotype.Controller;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 import org.springframework.web.bind.annotation.RequestParam;
 9 import org.springframework.web.servlet.ModelAndView;
10 
11 import com.wishwzp.model.Student;
12 
13 @Controller
14 @RequestMapping("/student")
15 public class StudentController {
16 
17     private static List<Student> studentList=new ArrayList<Student>();
18     
19     static{
20         studentList.add(new Student(1,"张三",11));
21         studentList.add(new Student(2,"李四",12));
22         studentList.add(new Student(3,"王五",13));
23     }
24     
25     @RequestMapping("/list")
26     public ModelAndView list(){
27         //返回模型和视图
28         ModelAndView mav=new ModelAndView();
29         mav.addObject("studentList", studentList);
30         mav.setViewName("student/list");
31         return mav;
32     }
33     
34     // required=false表示不传的话，会给参数赋值为null，required=true就是必须要有  
35     @RequestMapping("/preSave")
36     public ModelAndView preSave(@RequestParam(value="id",required=false) String id){
37         //返回模型和视图
38         ModelAndView mav=new ModelAndView();
39         
40         if(id!=null){
41             mav.addObject("student", studentList.get(Integer.parseInt(id)-1));
42             mav.setViewName("student/update");
43         }else{
44             mav.setViewName("student/add");            
45         }
46         return mav;
47     }
48 }

Student.java:

 1 package com.wishwzp.model;
 2 
 3 public class Student {
 4 
 5     private int id;
 6     private String name;
 7     private int age;
 8     
 9     public Student() {
10         super();
11         // TODO Auto-generated constructor stub
12     }
13     
14     public Student(int id, String name, int age) {
15         super();
16         this.id = id;
17         this.name = name;
18         this.age = age;
19     }
20 
21     public int getId() {
22         return id;
23     }
24     public void setId(int id) {
25         this.id = id;
26     }
27     public String getName() {
28         return name;
29     }
30     public void setName(String name) {
31         this.name = name;
32     }
33     public int getAge() {
34         return age;
35     }
36     public void setAge(int age) {
37         this.age = age;
38     }
39     
40 }

在文件WEB-INF>jsp>student中

add.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <form action="student/save.do" method="post">
11 <table>
12     <tr>
13         <th colspan="2">学生添加</th>
14     </tr>
15     <tr>
16         <td>姓名</td>
17         <td><input type="text" name="name"/></td>
18     </tr>
19     <tr>
20         <td>年龄</td>
21         <td><input type="text" name="age"/></td>
22     </tr>
23     <tr>
24         <td colspan="2">
25             <input type="submit" value="提交"/>
26         </td>
27     </tr>
28 </table>
29 </form>
30 </body>
31 </html>

list.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 <a href="${pageContext.request.contextPath}/student/preSave.do">添加学生</a>
12 <table>
13     <tr>
14         <th>编号</th>
15         <th>姓名</th>
16         <th>年龄</th>
17         <th>操作</th>    
18     </tr>
19     <c:forEach var="student" items="${studentList }">
20     <tr>
21         <td>${student.id }</td>
22         <td>${student.name }</td>
23         <td>${student.age }</td>
24         <td><a href="${pageContext.request.contextPath}/student/preSave.do?id=${student.id}">修改</a></td>
25     </tr>
26     </c:forEach>
27 </table>
28 
29 </body>
30 </html>

update.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <form action="student/save.do" method="post">
11 <table>
12     <tr>
13         <th colspan="2">学生修改</th>
14     </tr>
15     <tr>
16         <td>姓名</td>
17         <td><input type="text" name="name" value="${student.name }"/></td>
18     </tr>
19     <tr>
20         <td>年龄</td>
21         <td><input type="text" name="age" value="${student.age }"/></td>
22     </tr>
23     <tr>
24         <td colspan="2">
25             <input type="hidden" name="id" value="${student.id }"/>
26             <input type="submit" value="提交"/>
27         </td>
28     </tr>
29 </table>
30 </form>
31 </body>
32 </html>

第四节：SpringMVC对象属性自动封装

第五节：SpringMVC POST请求乱码解决

第六节：Controller内部转发和重定向

例子：

web.xml：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xmlns="http://java.sun.com/xml/ns/javaee"
 4     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 5     id="WebApp_ID" version="2.5">
 6     <display-name>SpringMvc01</display-name>
 7     <welcome-file-list>
 8         <welcome-file>index.jsp</welcome-file>
 9     </welcome-file-list>
10 
11     <servlet>
12         <servlet-name>springmvc</servlet-name>
13         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
14         <init-param>
15             <param-name>contextConfigLocation</param-name>
16             <param-value>classpath:spring-mvc.xml</param-value>
17         </init-param>
18     </servlet>
19     
20     <servlet-mapping>
21         <servlet-name>springmvc</servlet-name>
22         <url-pattern>*.do</url-pattern>
23     </servlet-mapping>
24     
25     <filter>
26         <filter-name>characterEncodingFilter</filter-name>
27         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
28         <init-param>
29             <param-name>encoding</param-name>
30             <param-value>utf-8</param-value>
31         </init-param>
32     </filter>
33     
34     <filter-mapping>
35         <filter-name>characterEncodingFilter</filter-name>
36         <url-pattern>*.do</url-pattern>
37     </filter-mapping>
38 </web-app>

index.jsp：

1 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
2     pageEncoding="ISO-8859-1"%>
3 <% response.sendRedirect("student/list.do"); %>

spring-mvc.xml：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:p="http://www.springframework.org/schema/p"
 5     xmlns:context="http://www.springframework.org/schema/context"
 6     xsi:schemaLocation="
 7         http://www.springframework.org/schema/beans
 8         http://www.springframework.org/schema/beans/spring-beans.xsd
 9         http://www.springframework.org/schema/context
10         http://www.springframework.org/schema/context/spring-context.xsd">
11 
12     <!-- 使用注解的包，包括子集 -->
13     <context:component-scan base-package="com.wishwzp"/>
14 
15     <!-- 视图解析器 -->
16     <bean id="viewResolver"
17         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
18         <property name="prefix" value="/WEB-INF/jsp/" />
19         <property name="suffix" value=".jsp"></property>
20     </bean>
21 
22 </beans>

StudentController.java:

 1 package com.wishwzp.controller;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 import org.springframework.stereotype.Controller;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 import org.springframework.web.bind.annotation.RequestParam;
 9 import org.springframework.web.servlet.ModelAndView;
10 
11 import com.wishwzp.model.Student;
12 
13 @Controller
14 @RequestMapping("/student")
15 public class StudentController {
16 
17     private static List<Student> studentList=new ArrayList<Student>();
18     
19     static{
20         studentList.add(new Student(1,"张三",11));
21         studentList.add(new Student(2,"李四",12));
22         studentList.add(new Student(3,"王五",13));
23     }
24     
25     @RequestMapping("/list")
26     public ModelAndView list(){
27         ModelAndView mav=new ModelAndView();
28         mav.addObject("studentList", studentList);
29         mav.setViewName("student/list");
30         return mav;
31     }
32     
33     @RequestMapping("/preSave")
34     public ModelAndView preSave(@RequestParam(value="id",required=false) String id){
35         ModelAndView mav=new ModelAndView();
36         if(id!=null){
37             mav.addObject("student", studentList.get(Integer.parseInt(id)-1));
38             mav.setViewName("student/update");
39         }else{
40             mav.setViewName("student/add");            
41         }
42         return mav;
43     }
44     
45     @RequestMapping("/save")
46     public String save(Student student){
47         
48         if(student.getId()!=0){
49             Student s=studentList.get(student.getId()-1);
50             s.setName(student.getName());
51             s.setAge(student.getAge());
52         }else{
53             studentList.add(student);            
54         }
55         
56         // return "redirect:/student/list.do";
57         return "forward:/student/list.do";
58     }
59     
60     @RequestMapping("/delete")
61     public String delete(@RequestParam("id") int id){
62         studentList.remove(id-1);
63         return "redirect:/student/list.do";
64     }
65 }

Student.java:

 1 package com.wishwzp.model;
 2 
 3 public class Student {
 4 
 5     private int id;
 6     private String name;
 7     private int age;
 8     
 9     public Student() {
10         super();
11         // TODO Auto-generated constructor stub
12     }
13     
14     public Student(int id, String name, int age) {
15         super();
16         this.id = id;
17         this.name = name;
18         this.age = age;
19     }
20 
21     public int getId() {
22         return id;
23     }
24     public void setId(int id) {
25         this.id = id;
26     }
27     public String getName() {
28         return name;
29     }
30     public void setName(String name) {
31         this.name = name;
32     }
33     public int getAge() {
34         return age;
35     }
36     public void setAge(int age) {
37         this.age = age;
38     }
39     
40 }

在文件WEB-INF>jsp>student中

add.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <form action="${pageContext.request.contextPath}/student/save.do" method="post">
11 <table>
12     <tr>
13         <th colspan="2">学生添加</th>
14     </tr>
15     <tr>
16         <td>姓名</td>
17         <td><input type="text" name="name"/></td>
18     </tr>
19     <tr>
20         <td>年龄</td>
21         <td><input type="text" name="age"/></td>
22     </tr>
23     <tr>
24         <td colspan="2">
25             <input type="submit" value="提交"/>
26         </td>
27     </tr>
28 </table>
29 </form>
30 </body>
31 </html>

list.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 <a href="${pageContext.request.contextPath}/student/preSave.do">添加学生</a>
12 <table>
13     <tr>
14         <th>编号</th>
15         <th>姓名</th>
16         <th>年龄</th>
17         <th>操作</th>    
18     </tr>
19     <c:forEach var="student" items="${studentList }">
20     <tr>
21         <td>${student.id }</td>
22         <td>${student.name }</td>
23         <td>${student.age }</td>
24         <td>
25             <a href="${pageContext.request.contextPath}/student/preSave.do?id=${student.id}">修改</a>
26             &nbsp;&nbsp;
27             <a href="${pageContext.request.contextPath}/student/delete.do?id=${student.id}">删除</a>
28         </td>
29     </tr>
30     </c:forEach>
31 </table>
32 
33 </body>
34 </html>

update.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <form action="${pageContext.request.contextPath}/student/save.do" method="post">
11 <table>
12     <tr>
13         <th colspan="2">学生修改</th>
14     </tr>
15     <tr>
16         <td>姓名</td>
17         <td><input type="text" name="name" value="${student.name }"/></td>
18     </tr>
19     <tr>
20         <td>年龄</td>
21         <td><input type="text" name="age" value="${student.age }"/></td>
22     </tr>
23     <tr>
24         <td colspan="2">
25             <input type="hidden" name="id" value="${student.id }"/>
26             <input type="submit" value="提交"/>
27         </td>
28     </tr>
29 </table>
30 </form>
31 </body>
32 </html>

第七节：SpringMVC对ServletAPI的支持

第八节：SpringMVC对JSON的支持

需要多添加这些jar包：

例子：

web.xml：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xmlns="http://java.sun.com/xml/ns/javaee"
 4     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 5     id="WebApp_ID" version="2.5">
 6     <display-name>SpringMvc01</display-name>
 7     <welcome-file-list>
 8         <welcome-file>index.jsp</welcome-file>
 9     </welcome-file-list>
10 
11     <servlet>
12         <servlet-name>springmvc</servlet-name>
13         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
14         <init-param>
15             <param-name>contextConfigLocation</param-name>
16             <param-value>classpath:spring-mvc.xml</param-value>
17         </init-param>
18     </servlet>
19     <servlet-mapping>
20         <servlet-name>springmvc</servlet-name>
21         <url-pattern>*.do</url-pattern>
22     </servlet-mapping>
23     
24     <filter>
25         <filter-name>characterEncodingFilter</filter-name>
26         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
27         <init-param>
28             <param-name>encoding</param-name>
29             <param-value>utf-8</param-value>
30         </init-param>
31     </filter>
32     <filter-mapping>
33         <filter-name>characterEncodingFilter</filter-name>
34         <url-pattern>*.do</url-pattern>
35     </filter-mapping>
36 </web-app>

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <a href="user/ajax.do">测试ajax</a>
11 <form action="user/login.do" method="post">
12     <table>
13         <tr>
14             <td>用户名：</td>
15             <td><input type="text" name="userName"/></td>
16         </tr>
17         <tr>
18             <td>密码：</td>
19             <td><input type="password" name="password"/></td>
20         </tr>
21         <tr>
22             <td>
23                 <input type="submit" value="登录"/>
24             </td>
25         </tr>
26     </table>
27 </form>
28 </body>
29 </html>

spring-mvc.xml：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:p="http://www.springframework.org/schema/p"
 5     xmlns:context="http://www.springframework.org/schema/context"
 6     xmlns:mvc="http://www.springframework.org/schema/mvc"
 7     xsi:schemaLocation="
 8         http://www.springframework.org/schema/beans
 9         http://www.springframework.org/schema/beans/spring-beans.xsd
10         http://www.springframework.org/schema/mvc
11         http://www.springframework.org/schema/mvc/spring-mvc.xsd
12         http://www.springframework.org/schema/context
13         http://www.springframework.org/schema/context/spring-context.xsd">
14 
15     <!-- 使用注解的包，包括子集 -->
16     <context:component-scan base-package="com.wishwzp"/>
17 
18     <!-- 支持对象与json的转换。 -->
19     <mvc:annotation-driven/> 
20 
21     <!-- 视图解析器 -->
22     <bean id="viewResolver"
23         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
24         <property name="prefix" value="/WEB-INF/jsp/" />
25         <property name="suffix" value=".jsp"></property>
26     </bean>
27 
28 </beans>

ResponseUtil.java:

 1 package com.wishwzp.util;
 2 
 3 import java.io.PrintWriter;
 4 
 5 import javax.servlet.http.HttpServletResponse;
 6 
 7 
 8 public class ResponseUtil {
 9 
10     public static void write(HttpServletResponse response,Object o)throws Exception{
11         response.setContentType("text/html;charset=utf-8");
12         PrintWriter out=response.getWriter();
13         out.println(o.toString());
14         out.flush();
15         out.close();
16     }
17 }

User.java:

 1 package com.wishwzp.model;
 2 
 3 public class User {
 4 
 5     private int id;
 6     private String userName;
 7     private String password;
 8     
 9     public User() {
10         super();
11         // TODO Auto-generated constructor stub
12     }
13     public User(String userName, String password) {
14         super();
15         this.userName = userName;
16         this.password = password;
17     }
18 
19     public int getId() {
20         return id;
21     }
22     public void setId(int id) {
23         this.id = id;
24     }
25     public String getUserName() {
26         return userName;
27     }
28     public void setUserName(String userName) {
29         this.userName = userName;
30     }
31     public String getPassword() {
32         return password;
33     }
34     public void setPassword(String password) {
35         this.password = password;
36     }
37     
38 }

UserController.java:

 1 package com.wishwzp.controller;
 2 
 3 import javax.servlet.http.Cookie;
 4 import javax.servlet.http.HttpServletRequest;
 5 import javax.servlet.http.HttpServletResponse;
 6 import javax.servlet.http.HttpSession;
 7 
 8 import org.springframework.stereotype.Controller;
 9 import org.springframework.web.bind.annotation.RequestMapping;
10 import org.springframework.web.bind.annotation.ResponseBody;
11 
12 import com.wishwzp.model.User;
13 
14 @Controller
15 @RequestMapping("/user")
16 public class UserController {
17 
18     @RequestMapping("/login")
19     public String login(HttpServletRequest request,HttpServletResponse response){
20         System.out.println("----登录验证---");
21         String userName=request.getParameter("userName");
22         String password=request.getParameter("password");
23         Cookie cookie=new Cookie("user",userName+"-"+password);
24         cookie.setMaxAge(1*60*60*24*7);
25         User currentUser=new User(userName,password);
26         response.addCookie(cookie);
27         HttpSession session=request.getSession();
28         session.setAttribute("currentUser", currentUser);
29         return "redirect:/main.jsp";
30     }
31     
32     @RequestMapping("/login2")
33     public String login2(HttpServletRequest request){
34         return "redirect:/main.jsp";
35     }
36     
37     @RequestMapping("/login3")
38     public String login3(HttpSession session){
39         return "redirect:/main.jsp";
40     }
41     
42     @RequestMapping("/ajax")
43     public @ResponseBody User ajax(){
44         User user=new User("zhangsan","123");
45         return user;
46     }
47 }

main.jsp:

 1 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 2     pageEncoding="ISO-8859-1"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 Main.jsp  ${currentUser.userName }
11 </body>
12 </html>

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原文地址：https://www.cnblogs.com/wishwzp/p/5654458.html