SpringMVC联手REST实现入门级的CRUD
这是一个WebProject，用到的是spring-framework-3.1.1.RELEASE
首先是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"> <servlet> <servlet-name>user</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>user</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <filter> <filter-name>SpringCharacterEncodingFilter</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>SpringCharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app></strong></span>然后是SpringMVC的配置文件user-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: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-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:component-scan base-package="com.jadyer"/> <mvc:annotation-driven/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> </beans></strong></span>用来添加用户信息的//WEB-INF//jsp/user/add.jsp
<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> <%-- 这里并没有指定action=""，说明表单是提交给自己的，说白了就是"哪来的回哪儿去 --%> <form:form method="POST" modelAttribute="user"> username: <form:input path="username"/><br/> nickname: <form:input path="nickname"/><br/> password: <form:password path="password"/><br/> yourmail: <form:input path="email"/><br/> <input type="submit" value="添加新用户"/> </form:form></strong></span>用来列出所有用户信息的//WEB-INF//jsp/user/list.jsp
<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <c:forEach items="${users}" var="user"> ${user.value.username}----${user.value.nickname}----${user.value.password}----${user.value.email} <a href="<%=request.getContextPath()%>/user/${user.value.username}">查看</a> <a href="<%=request.getContextPath()%>/user/${user.value.username}/update">编辑</a> <a href="<%=request.getContextPath()%>/user/${user.value.username}/delete">删除</a> <br/> </c:forEach> <br/> <a href="<%=request.getContextPath()%>/user/add">继续添加用户</a> </strong></span>用来显示单个用户信息的//WEB-INF//jsp/user/show.jsp <%@ page language="java" pageEncoding="UTF-8"%> ${user.username}----${user.nickname}----${user.password}----${user.email} <br/> <br/> <a href="<%=request.getContextPath()%>/user/add">继续添加用户</a> </strong></span>用来更新单个用户信息的//WEB-INF//jsp/user/update.jsp<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> <form:form method="POST" modelAttribute="user"> username: <form:input path="username"/><br/> nickname: <form:input path="nickname"/><br/> password: <form:password path="password"/><br/> yourmail: <form:input path="email"/><br/> <input type="submit" value="更新用户信息"/> </form:form></strong></span>下面是用户的实体类User.java
package com.jadyer.model; /** * User * @author http://blog.csdn.net/jadyer * @create May 12, 2012 1:24:43 AM */ public class User { private String username; private String nickname; private String password; private String email; public User() {} public User(String username, String nickname, String password, String email) { this.username = username; this.nickname = nickname; this.password = password; this.email = email; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getNickname() { return nickname; } public void setNickname(String nickname) { this.nickname = nickname; } 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; } } </strong></span>最后是核心的UserController.java package com.jadyer.controller; import java.util.HashMap; import java.util.Map; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import com.jadyer.model.User; /** * UserController * @author http://blog.csdn.net/jadyer * @create May 12, 2012 1:26:21 AM */ @Controller @RequestMapping("/user") public class UserController { private final static Map<String,User> users = new HashMap<String,User>(); //模拟数据源,构造初始数据 public UserController(){ users.put("张起灵", new User("张起灵", "闷油瓶", "02200059", "menyouping@yeah.net")); users.put("李寻欢", new User("李寻欢", "李探花", "08866659", "lixunhuan@gulong.cn")); users.put("拓拔野", new User("拓拔野", "搜神记", "05577759", "tuobaye@manhuang.cc")); users.put("孙悟空", new User("孙悟空", "美猴王", "03311159", "sunhouzi@xiyouji.zh")); } /** * 添加新用户 * @see 访问/user/add时，GET请求就执行addUser(Model model)方法，POST请求就执行addUser(User user)方法 */ @RequestMapping(value="/add", method=RequestMethod.GET) public String addUser(Model model){ //这里要传给前台一个空对象，否则会报告java.lang.IllegalStateException异常 //异常信息为Neither BindingResult nor plain target object for bean name 'user' available as request attribute //并且传过去的key值要与前台modelAttribute属性值相同，即model.addAttribute("user", new User()); //我们也可以写成下面这种方式，此时SpringMVC会自动把对象名转换为小写值作为key，即User-->user model.addAttribute(new User()); return "user/add"; } @RequestMapping(value="/add", method=RequestMethod.POST) public String addUser(User user){ //这里参数中的user就应该与add.jsp中的modelAttribute="user"一致了 users.put(user.getUsername(), user); return "redirect:/user/list"; } /** * 列出所有用户信息 */ @RequestMapping("/list") public String list(Model model){ model.addAttribute("users", users); return "user/list"; } /** * 查询用户信息 * @see 访问该方法的路径就应该是"/user/具体的用户名" * @see 这里value="/{username}"的写法，需要格外注意一下，它是一个路径变量，此时用来接收前台的一个资源 * @see 这时value="/{username}"就会到方法参数中找@PathVariable String username，并将路径变量值传给username参数 */ @RequestMapping(value="/{myname}", method=RequestMethod.GET) public String show(@PathVariable String myname, Model model){ model.addAttribute(users.get(myname)); return "user/show"; } /** * 编辑用户信息 * @see 访问该方法的路径就应该是"/user/具体的用户名/update" */ @RequestMapping(value="/{myname}/update", method=RequestMethod.GET) public String update(@PathVariable String myname, Model model){ model.addAttribute(users.get(myname)); return "user/update"; } @RequestMapping(value="/{myname}/update", method=RequestMethod.POST) public String update(User user){ users.put(user.getUsername(), user); return "redirect:/user/list"; //也可以retun "forward:/user/list",此时浏览器地址栏会有不同 } /** * 删除用户信息 */ @RequestMapping(value="/{myname}/delete", method=RequestMethod.GET) public String delete(@PathVariable String myname){ users.remove(myname); return "redirect:/user/list"; //删除完成后显示当前存在的所有用户信息 } } </strong></span>转自：http://blog.csdn.net/jadyer/article/details/7574659
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