（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>
<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>
login.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>
<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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