整理SpringMvc02（返回ModelAndView）

1.配置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">


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


<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>

2.配置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>

<filter>
<description>字符集过滤器</description>
<filter-name>encodingFilter</filter-name>
<filter-class>
org.springframework.web.filter.CharacterEncodingFilter
</filter-class>
<init-param>
<description>字符集编码</description>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<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>

3.新建一个model包下面的Student类：

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;
}

}

4.创建StudentController控制器：

import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;

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.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){
//这里是模拟的数据，没有操作数据库
mav.addObject("student", studentList.get(Integer.parseInt(id)-1));
mav.setViewName("student/update");
}else{
mav.setViewName("student/add");
}
return mav;
}

/**
* 一种直接用对象接收一种用request.getParameter 都可以实现
* @param request
* @return
*/
/*@RequestMapping("/save")
public String save(HttpServletRequest request){
Student stu=new Student();
String name = request.getParameter("name");
String age = request.getParameter("age");
int id=(int) (Math.random()*100);
stu.setAge(Integer.parseInt(age));
stu.setName(name);
stu.setId(id);
studentList.add(stu);
return "redirect:/student/list.do";
}*/

/**
* 这种保存是可以的
* @param stu
* @return
*/
@RequestMapping("/save")
public String save(Student stu){
//这里只是简单的模拟一下修改还是添加
if(stu.getId()!=0) {
Student s=studentList.get(stu.getId()-1);
s.setName(stu.getName());
s.setAge(stu.getAge());
}else {
int id=(int) (Math.random()*100);
stu.setId(id);
studentList.add(stu);
}
//重定向
//return "redirect:/student/list.do";
//还有一种转发带数据的地址不会变的
return "forward:/student/list.do";
}

/**
* 这种保存是可以的
* @param stu
* @return
*/
@RequestMapping("/delete")
public String delete(@RequestParam("id") int id){
studentList.remove(id-1);
//重定向
return "redirect:/student/list.do";
}
}

5.创建jsp页面

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>

需要的jar：

最后访问：

http://localhost:8080/SpringMvc02/student/list.do

http://localhost:8080/SpringMvc02/student/preSave?id=1

保存修改之后，直接重定向到list

整理SpringMvc02（返回ModelAndView）

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