Spring MVC之用户管理一_spring mvc中用户是怎么看到管理员分布的公告-优快云博客

本文链接：https://blog.youkuaiyun.com/web8i/article/details/8514453

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.youkuaiyun.com/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;

@Controller
public 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;

@Service
public 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;
	}
}