（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：

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"

     pageEncoding="ISO-8859-1"%>

 <% response.sendRedirect("student/list.do"); %>

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"

     id="WebApp_ID" version="2.5">

     <display-name>SpringMvc01</display-name>

     <welcome-file-list>

         <welcome-file>index.jsp</welcome-file>

     </welcome-file-list>

     <servlet>

         <servlet-name>springmvc</servlet-name>

         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

         <init-param>

             <param-name>contextConfigLocation</param-name>

             <param-value>classpath:spring-mvc.xml</param-value>

         </init-param>

     </servlet>

     <servlet-mapping>

         <servlet-name>springmvc</servlet-name>

         <url-pattern>*.do</url-pattern>

     </servlet-mapping>

 </web-app>

spring-mvc.xml:

 <?xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xmlns:p="http://www.springframework.org/schema/p"

     xmlns:context="http://www.springframework.org/schema/context"

     xsi:schemaLocation="

         http://www.springframework.org/schema/beans

         http://www.springframework.org/schema/beans/spring-beans.xsd

         http://www.springframework.org/schema/context

         http://www.springframework.org/schema/context/spring-context.xsd">

     <!-- 使用注解的包，包括子集 -->

     <context:component-scan base-package="com.wishwzp"/>

     <!-- 视图解析器 -->

     <bean id="viewResolver"

         class="org.springframework.web.servlet.view.InternalResourceViewResolver">

         <property name="prefix" value="/WEB-INF/jsp/" />

         <property name="suffix" value=".jsp"></property>

     </bean>

 </beans>

StudentController.java:

 package com.wishwzp.controller;

 import java.util.ArrayList;

 import java.util.List;

 import org.springframework.stereotype.Controller;

 import org.springframework.web.bind.annotation.RequestMapping;

 import org.springframework.web.bind.annotation.RequestParam;

 import org.springframework.web.servlet.ModelAndView;

 import com.wishwzp.model.Student;

 @Controller

 @RequestMapping("/student")

 public class StudentController {

     private static List<Student> studentList=new ArrayList<Student>();

     static{

         studentList.add(new Student(1,"张三",11));

         studentList.add(new Student(2,"李四",12));

         studentList.add(new Student(3,"王五",13));

     }

     @RequestMapping("/list")

     public ModelAndView list(){

         //返回模型和视图

         ModelAndView mav=new ModelAndView();

         mav.addObject("studentList", studentList);

         mav.setViewName("student/list");

         return mav;

     }

     // required=false表示不传的话，会给参数赋值为null，required=true就是必须要有

     @RequestMapping("/preSave")

     public ModelAndView preSave(@RequestParam(value="id",required=false) String id){

         //返回模型和视图

         ModelAndView mav=new ModelAndView();

         if(id!=null){

             mav.addObject("student", studentList.get(Integer.parseInt(id)-1));

             mav.setViewName("student/update");

         }else{

             mav.setViewName("student/add");

         }

         return mav;

     }

 }

Student.java:

 package com.wishwzp.model;

 public class Student {

     private int id;

     private String name;

     private int age;

     public Student() {

         super();

         // TODO Auto-generated constructor stub

     }

     public Student(int id, String name, int age) {

         super();

         this.id = id;

         this.name = name;

         this.age = age;

     }

     public int getId() {

         return id;

     }

     public void setId(int id) {

         this.id = id;

     }

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public int getAge() {

         return age;

     }

     public void setAge(int age) {

         this.age = age;

     }

 }

在文件WEB-INF>jsp>student中

add.jsp:

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

 <form action="student/save.do" method="post">

 <table>

     <tr>

         <th colspan="2">学生添加</th>

     </tr>

     <tr>

         <td>姓名</td>

         <td><input type="text" name="name"/></td>

     </tr>

     <tr>

         <td>年龄</td>

         <td><input type="text" name="age"/></td>

     </tr>

     <tr>

         <td colspan="2">

             <input type="submit" value="提交"/>

         </td>

     </tr>

 </table>

 </form>

 </body>

 </html>

list.jsp:

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

 <a href="${pageContext.request.contextPath}/student/preSave.do">添加学生</a>

 <table>

     <tr>

         <th>编号</th>

         <th>姓名</th>

         <th>年龄</th>

         <th>操作</th>

     </tr>

     <c:forEach var="student" items="${studentList }">

     <tr>

         <td>${student.id }</td>

         <td>${student.name }</td>

         <td>${student.age }</td>

         <td><a href="${pageContext.request.contextPath}/student/preSave.do?id=${student.id}">修改</a></td>

     </tr>

     </c:forEach>

 </table>

 </body>

 </html>

update.jsp:

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

 <form action="student/save.do" method="post">

 <table>

     <tr>

         <th colspan="2">学生修改</th>

     </tr>

     <tr>

         <td>姓名</td>

         <td><input type="text" name="name" value="${student.name }"/></td>

     </tr>

     <tr>

         <td>年龄</td>

         <td><input type="text" name="age" value="${student.age }"/></td>

     </tr>

     <tr>

         <td colspan="2">

             <input type="hidden" name="id" value="${student.id }"/>

             <input type="submit" value="提交"/>

         </td>

     </tr>

 </table>

 </form>

 </body>

 </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：

 <?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"

     id="WebApp_ID" version="2.5">

     <display-name>SpringMvc01</display-name>

     <welcome-file-list>

         <welcome-file>index.jsp</welcome-file>

     </welcome-file-list>

     <servlet>

         <servlet-name>springmvc</servlet-name>

         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

         <init-param>

             <param-name>contextConfigLocation</param-name>

             <param-value>classpath:spring-mvc.xml</param-value>

         </init-param>

     </servlet>

     <servlet-mapping>

         <servlet-name>springmvc</servlet-name>

         <url-pattern>*.do</url-pattern>

     </servlet-mapping>

     <filter>

         <filter-name>characterEncodingFilter</filter-name>

         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

         <init-param>

             <param-name>encoding</param-name>

             <param-value>utf-8</param-value>

         </init-param>

     </filter>

     <filter-mapping>

         <filter-name>characterEncodingFilter</filter-name>

         <url-pattern>*.do</url-pattern>

     </filter-mapping>

 </web-app>

index.jsp：

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"

     pageEncoding="ISO-8859-1"%>

 <% response.sendRedirect("student/list.do"); %>

spring-mvc.xml：

 <?xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xmlns:p="http://www.springframework.org/schema/p"

     xmlns:context="http://www.springframework.org/schema/context"

     xsi:schemaLocation="

         http://www.springframework.org/schema/beans

         http://www.springframework.org/schema/beans/spring-beans.xsd

         http://www.springframework.org/schema/context

         http://www.springframework.org/schema/context/spring-context.xsd">

     <!-- 使用注解的包，包括子集 -->

     <context:component-scan base-package="com.wishwzp"/>

     <!-- 视图解析器 -->

     <bean id="viewResolver"

         class="org.springframework.web.servlet.view.InternalResourceViewResolver">

         <property name="prefix" value="/WEB-INF/jsp/" />

         <property name="suffix" value=".jsp"></property>

     </bean>

 </beans>

StudentController.java:

 package com.wishwzp.controller;

 import java.util.ArrayList;

 import java.util.List;

 import org.springframework.stereotype.Controller;

 import org.springframework.web.bind.annotation.RequestMapping;

 import org.springframework.web.bind.annotation.RequestParam;

 import org.springframework.web.servlet.ModelAndView;

 import com.wishwzp.model.Student;

 @Controller

 @RequestMapping("/student")

 public class StudentController {

     private static List<Student> studentList=new ArrayList<Student>();

     static{

         studentList.add(new Student(1,"张三",11));

         studentList.add(new Student(2,"李四",12));

         studentList.add(new Student(3,"王五",13));

     }

     @RequestMapping("/list")

     public ModelAndView list(){

         ModelAndView mav=new ModelAndView();

         mav.addObject("studentList", studentList);

         mav.setViewName("student/list");

         return mav;

     }

     @RequestMapping("/preSave")

     public ModelAndView preSave(@RequestParam(value="id",required=false) String id){

         ModelAndView mav=new ModelAndView();

         if(id!=null){

             mav.addObject("student", studentList.get(Integer.parseInt(id)-1));

             mav.setViewName("student/update");

         }else{

             mav.setViewName("student/add");

         }

         return mav;

     }

     @RequestMapping("/save")

     public String save(Student student){

         if(student.getId()!=0){

             Student s=studentList.get(student.getId()-1);

             s.setName(student.getName());

             s.setAge(student.getAge());

         }else{

             studentList.add(student);

         }

         // return "redirect:/student/list.do";

         return "forward:/student/list.do";

     }

     @RequestMapping("/delete")

     public String delete(@RequestParam("id") int id){

         studentList.remove(id-1);

         return "redirect:/student/list.do";

     }

 }

Student.java:

 package com.wishwzp.model;

 public class Student {

     private int id;

     private String name;

     private int age;

     public Student() {

         super();

         // TODO Auto-generated constructor stub

     }

     public Student(int id, String name, int age) {

         super();

         this.id = id;

         this.name = name;

         this.age = age;

     }

     public int getId() {

         return id;

     }

     public void setId(int id) {

         this.id = id;

     }

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public int getAge() {

         return age;

     }

     public void setAge(int age) {

         this.age = age;

     }

 }

在文件WEB-INF>jsp>student中

add.jsp:

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

 <form action="${pageContext.request.contextPath}/student/save.do" method="post">

 <table>

     <tr>

         <th colspan="2">学生添加</th>

     </tr>

     <tr>

         <td>姓名</td>

         <td><input type="text" name="name"/></td>

     </tr>

     <tr>

         <td>年龄</td>

         <td><input type="text" name="age"/></td>

     </tr>

     <tr>

         <td colspan="2">

             <input type="submit" value="提交"/>

         </td>

     </tr>

 </table>

 </form>

 </body>

 </html>

list.jsp:

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

 <a href="${pageContext.request.contextPath}/student/preSave.do">添加学生</a>

 <table>

     <tr>

         <th>编号</th>

         <th>姓名</th>

         <th>年龄</th>

         <th>操作</th>

     </tr>

     <c:forEach var="student" items="${studentList }">

     <tr>

         <td>${student.id }</td>

         <td>${student.name }</td>

         <td>${student.age }</td>

         <td>

             <a href="${pageContext.request.contextPath}/student/preSave.do?id=${student.id}">修改</a>

             &nbsp;&nbsp;

             <a href="${pageContext.request.contextPath}/student/delete.do?id=${student.id}">删除</a>

         </td>

     </tr>

     </c:forEach>

 </table>

 </body>

 </html>

update.jsp:

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

 <form action="${pageContext.request.contextPath}/student/save.do" method="post">

 <table>

     <tr>

         <th colspan="2">学生修改</th>

     </tr>

     <tr>

         <td>姓名</td>

         <td><input type="text" name="name" value="${student.name }"/></td>

     </tr>

     <tr>

         <td>年龄</td>

         <td><input type="text" name="age" value="${student.age }"/></td>

     </tr>

     <tr>

         <td colspan="2">

             <input type="hidden" name="id" value="${student.id }"/>

             <input type="submit" value="提交"/>

         </td>

     </tr>

 </table>

 </form>

 </body>

 </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：

 <?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"

     id="WebApp_ID" version="2.5">

     <display-name>SpringMvc01</display-name>

     <welcome-file-list>

         <welcome-file>index.jsp</welcome-file>

     </welcome-file-list>

     <servlet>

         <servlet-name>springmvc</servlet-name>

         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

         <init-param>

             <param-name>contextConfigLocation</param-name>

             <param-value>classpath:spring-mvc.xml</param-value>

         </init-param>

     </servlet>

     <servlet-mapping>

         <servlet-name>springmvc</servlet-name>

         <url-pattern>*.do</url-pattern>

     </servlet-mapping>

     <filter>

         <filter-name>characterEncodingFilter</filter-name>

         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

         <init-param>

             <param-name>encoding</param-name>

             <param-value>utf-8</param-value>

         </init-param>

     </filter>

     <filter-mapping>

         <filter-name>characterEncodingFilter</filter-name>

         <url-pattern>*.do</url-pattern>

     </filter-mapping>

 </web-app>

 <%@ page language="java" contentType="text/html; charset=utf-8"

     pageEncoding="utf-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

 <title>Insert title here</title>

 </head>

 <body>

 <a href="user/ajax.do">测试ajax</a>

 <form action="user/login.do" method="post">

     <table>

         <tr>

             <td>用户名：</td>

             <td><input type="text" name="userName"/></td>

         </tr>

         <tr>

             <td>密码：</td>

             <td><input type="password" name="password"/></td>

         </tr>

         <tr>

             <td>

                 <input type="submit" value="登录"/>

             </td>

         </tr>

     </table>

 </form>

 </body>

 </html>

spring-mvc.xml：

 <?xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xmlns:p="http://www.springframework.org/schema/p"

     xmlns:context="http://www.springframework.org/schema/context"

     xmlns:mvc="http://www.springframework.org/schema/mvc"

     xsi:schemaLocation="

         http://www.springframework.org/schema/beans

         http://www.springframework.org/schema/beans/spring-beans.xsd

         http://www.springframework.org/schema/mvc

         http://www.springframework.org/schema/mvc/spring-mvc.xsd

         http://www.springframework.org/schema/context

         http://www.springframework.org/schema/context/spring-context.xsd">

     <!-- 使用注解的包，包括子集 -->

     <context:component-scan base-package="com.wishwzp"/>

     <!-- 支持对象与json的转换。 -->

     <mvc:annotation-driven/> 

     <!-- 视图解析器 -->

     <bean id="viewResolver"

         class="org.springframework.web.servlet.view.InternalResourceViewResolver">

         <property name="prefix" value="/WEB-INF/jsp/" />

         <property name="suffix" value=".jsp"></property>

     </bean>

 </beans>

ResponseUtil.java:

 package com.wishwzp.util;

 import java.io.PrintWriter;

 import javax.servlet.http.HttpServletResponse;

 public class ResponseUtil {

     public static void write(HttpServletResponse response,Object o)throws Exception{

         response.setContentType("text/html;charset=utf-8");

         PrintWriter out=response.getWriter();

         out.println(o.toString());

         out.flush();

         out.close();

     }

 }

User.java:

 package com.wishwzp.model;

 public class User {

     private int id;

     private String userName;

     private String password;

     public User() {

         super();

         // TODO Auto-generated constructor stub

     }

     public User(String userName, String password) {

         super();

         this.userName = userName;

         this.password = password;

     }

     public int getId() {

         return id;

     }

     public void setId(int id) {

         this.id = id;

     }

     public String getUserName() {

         return userName;

     }

     public void setUserName(String userName) {

         this.userName = userName;

     }

     public String getPassword() {

         return password;

     }

     public void setPassword(String password) {

         this.password = password;

     }

 }

UserController.java:

 package com.wishwzp.controller;

 import javax.servlet.http.Cookie;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import javax.servlet.http.HttpSession;

 import org.springframework.stereotype.Controller;

 import org.springframework.web.bind.annotation.RequestMapping;

 import org.springframework.web.bind.annotation.ResponseBody;

 import com.wishwzp.model.User;

 @Controller

 @RequestMapping("/user")

 public class UserController {

     @RequestMapping("/login")

     public String login(HttpServletRequest request,HttpServletResponse response){

         System.out.println("----登录验证---");

         String userName=request.getParameter("userName");

         String password=request.getParameter("password");

         Cookie cookie=new Cookie("user",userName+"-"+password);

         cookie.setMaxAge(1*60*60*24*7);

         User currentUser=new User(userName,password);

         response.addCookie(cookie);

         HttpSession session=request.getSession();

         session.setAttribute("currentUser", currentUser);

         return "redirect:/main.jsp";

     }

     @RequestMapping("/login2")

     public String login2(HttpServletRequest request){

         return "redirect:/main.jsp";

     }

     @RequestMapping("/login3")

     public String login3(HttpSession session){

         return "redirect:/main.jsp";

     }

     @RequestMapping("/ajax")

     public @ResponseBody User ajax(){

         User user=new User("zhangsan","123");

         return user;

     }

 }

main.jsp:

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"

     pageEncoding="ISO-8859-1"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

 <title>Insert title here</title>

 </head>

 <body>

 Main.jsp  ${currentUser.userName }

 </body>

 </html>

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