Spring MVC之用户管理一

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Spring MVC之用户管理

余志勇

SINA微博：http://weibo.com/web8i

QQ微博：http://t.qq.com/webiiiiiiii

博客：http://blog.csdn.net/web8i

本文在上篇【Spring MVC之HelloWorld】的基础上开发一个简单的CRUD应用，为了减少非Spring MVC相关知识，本应用没有使用数据库而是直接把数据存入内存中。当然这也不是本文的重点。

目标：如下图完成用户的增删改查功能。

工具：MyEclipse 8.6（也可以选择任何其它IDE工具，本系列文章尽量不使用工具特有的东东）

主要任务：

工程：

userdemo Web项目（新增）

视图：

index.jsp（新增）

user_add.jsp（新增）

user_edit.jsp（新增）

user_list.jsp（新增）

控制器：

UserController.java（新增）重点

模型：

UserService.java

User.java

配置：

web.xml(如上文）

spring_servlet.xml（如上文）

项目结构如下图：

参考代码：

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>    <body>    <a href="user/list.html">UserManager</a> <br>  </body></html>

user_list.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><html><body><h2>User Manager</h2><hr /><table border="1" width="80%">  <tr>  <td>ID</td>  <td>User Name</td>  <td>Password</td>  <td>Email</td>  <td>COMMAND</td>  </tr>  <c:forEach items="${userList}" var="user">      <tr>      <td>${user.id}</td>      <td>${user.userName}</td>      <td>${user.password}</td>      <td>${user.email}</td>         <td>        <a href="${user.id}/edit.html">Edit</a>|        <a href="add.html">Add</a>|        <a href="${user.id}/remove.html">Remove</a>     </td>    </tr>    </c:forEach></table>   </body></html>

user_add.jsp

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%><html><body><h2>User Manager</h2><form:form method="post" action="save.html">     <table>        <tr>        <td><form:label path="id">ID</form:label></td>        <td><form:input path="id" /></td>    </tr>    <tr>        <td><form:label path="userName">UserName</form:label></td>        <td><form:input path="userName" /></td>    </tr>    <tr>        <td><form:label path="password">Password</form:label></td>        <td><form:password path="password" /></td>    </tr>    <tr>        <td><form:label path="email">Email</form:label></td>        <td><form:input path="email" /></td>    </tr>    <tr>        <td colspan="2">            <input type="submit" value="Add User"/>        </td>    </tr></table>   </form:form><a href="list.html">Go</a></body></html>

user_edit.jsp

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%><html><body><h2>User Manager</h2><form:form method="post" action="update.html">     <table>        <form:hidden path="id" />    <tr>        <td><form:label path="userName">UserName</form:label></td>        <td><form:input path="userName" /></td>    </tr>    <tr>        <td><form:label path="password">Password</form:label></td>        <td><form:password path="password" /></td>    </tr>    <tr>        <td><form:label path="email">Email</form:label></td>        <td><form:input path="email" /></td>    </tr>    <tr>        <td colspan="2">            <input type="submit" value="Update User"/>        </td>    </tr></table>   </form:form><a href="list.html">Go</a></body></html>

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><display-name>HelloWorld</display-name><servlet><display-name>spring</display-name><servlet-name>spring</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>spring</servlet-name><url-pattern>*.html</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list></web-app>

spring_servlet.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:mvc="http://www.springframework.org/schema/mvc"    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/mvc        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context.xsd">               <!-- 自动扫描的包名 -->     <context:component-scan base-package="org.web8i.controller,org.web8i.service"/>           <!-- 视图解释类 -->     <bean id="viewResolver"           class="org.springframework.web.servlet.view.UrlBasedViewResolver"          >                <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />        <property name="prefix" value="/WEB-INF/view/jsp/" />        <property name="suffix" value=".jsp" /><!--可为空,方便实现自已的依据扩展名来选择视图解释类的逻辑  -->    </bean>                </beans>

UserController.java

package org.web8i.controller;import java.util.ArrayList;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import org.web8i.model.User;import org.web8i.service.UserService;@Controllerpublic class UserController {@Autowired(required=true)private UserService userService;//用户列表界面@RequestMapping(value="/user/list")public ModelAndView listUsers(){List<User> userList = new ArrayList<User>();userList = userService.getUserList();/**ModelAndView构造函数3个参数中，参数1表示返回的视图名即相应的JSP，这里会 * 这里是/WEB-INF/view/jsp/user_list.jsp,为什么呢？请参考 * spring_servlet.xml文件中的viewResolver的配置;参数2表示放入模型中 * 属性的名字;参数3表示模型中对应属性的值。 */return new ModelAndView("user_list","userList",userList);}//新增界面@RequestMapping(value="/user/add")public ModelAndView addUser(User user){return new ModelAndView("user_add","command",user);//command是系统默认的模型属性名}//新增保存功能 @RequestMapping(value="/user/save")public String saveUser(User user){userService.addUser(user);return "redirect:list.html";}//修改界面@RequestMapping(value="/user/{userId}/edit")public ModelAndView editUser(@PathVariable("userId") int userId){User user = userService.getUserById(userId);return new ModelAndView("user_edit","command",user);}//修改保存功能@RequestMapping(value="/user/{userId}/update")public String updateUser(User user){userService.updateUser(user);return "redirect:../list.html";}//删除功能@RequestMapping(value="/user/{userId}/remove")public String removeUser(@PathVariable("userId") int userId){userService.removeUser(userId);return "redirect:../list.html";}}

UserService.java

package org.web8i.service;import java.util.ArrayList;import java.util.List;import org.springframework.stereotype.Service;import org.web8i.model.User;@Servicepublic class UserService {static  List<User> userList = new ArrayList<User>();static{User u1 = new User();u1.setId(1);u1.setUserName("David");u1.setPassword("123456");u1.setEmail("david@web8i.org");userList.add(u1);User u2 = new User();u2.setId(2);u2.setUserName("Naivee");u2.setPassword("123456");u2.setEmail("naivee@web8i.org");userList.add(u2);User u3 = new User();u3.setId(3);u3.setUserName("Mike");u3.setPassword("123456");u3.setEmail("mike@web8i.org");userList.add(u3);}public List<User> getUserList(){return userList;}public User getUserById(int userId){for(User u : userList){if(u.getId() == userId){return u;}}return null;}public void addUser(User user){userList.add(user);}public void updateUser(User user){int index = -1;for(User u : userList){if(u.getId() == user.getId()) index++;}userList.set(index, user);}public void removeUser(int userId){userList.remove(this.getUserById(userId));}}

User.java

package org.web8i.model;public class User {private int id;private String userName;private String password;private String email;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;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}}