springmvc定制伪REST风格及JSR303Bean校验整合

REST风格与传统风格比较
　　查询用户 
　　　　传统方式 /user_detail?id=120
　　　　Rest风格 /user/120
　　删除用户
　　　　传统方式 /user_delete?id=123
　　　　Rest风格 /user/123/delete
　　修改用户
　　　　传统方式 /user_update?id=123
　　　　Rest风格 /user/123/update
　　获取列表
　　　　传统方式 /user_list
　　　　Rest风格 /users   或者 /user/users
JSR303
　　JSR-303 是JAVA EE 6 中的一项子规范，叫做Bean Validation，官方参考实现是Hibernate Validator。
　　此实现与Hibernate ORM 没有任何关系。JSR 303 用于对Java Bean 中的字段的值进行验证。 
　　Bean validation 下载地址:  http://download.oracle.com/otndocs/jcp/bean_validation-1_1_0_cr1-pfd-spec/index.html
实例演示

实体类

package com.springmvc.demo.entity;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;
public class User {

@NotNull(message="用户名不能为空")
private String username;

@NotNull(message="密码不能为空")
@Size(min=4,max=10,message="密码长度必须在4-10的长度")
private String password;

@Pattern(regexp="^[a-zA-Z0-9_]+@[a-zA-Z0-9_]+.[a-zA-Z]{2,5}?((.cn)|(.jp))?$", message="邮箱格式不正确")
private String email;

public User(){}

public User(String username, String password, String email) {
super();
this.username = username;
this.password = password;
this.email = email;
}
//getter and  setter
}

web.xml文件

<?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"> 
<!-- 配置字符过滤器,必须在OpenSessionInViewerFilter之前 -->
<filter>
<filter-name>CharacterFilter</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>CharacterFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<servlet>
<servlet-name>dispatcher</servlet-name> <!-- 此处用的是dispacter,所以同目录下的想xml文件名应该为dispacter-servlet.xml -->
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

</web-app>

dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans  xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd ">

<!--
指定使用注解方式配置,配置自动扫描的包名,
base-package指定自己应用中控制器所在的包目录
<context:component-scan/> 扫描指定的包中的类上的注解，常用的注解有：
@Controller 声明Action组件
@Service 声明Service组件
@Service("myMovieLister")
@Repository 声明Dao组件
@Component 泛指组件, 当不好归类时.
@RequestMapping("/menu") 请求映射
@Resource用于注入，( j2ee提供的 ) 默认按名称装配，
@Resource(name="beanName")
@Autowired用于注入，(srping提供的) 默认按类型装配
@Transactional(rollbackFor={Exception.class}) 事务管理
@ResponseBody @Scope("prototype")设定bean的作用域
-->
<context:component-scan base-package="com.springmvc.demo.controller" />

<!-- 默认的注解映射的支持 -->
<!-- JSR-303 support will be detected on classpath and enabled automatically -->
<mvc:annotation-driven/>
<!-- http://static.springsource.org/spring/docs/3.0.0.RC3/reference/html/ch05s07.html --><!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 配置视图层 使用jstl标签 -->
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<!-- 定义视图前缀格式 -->
<property name="prefix" value="/WEB-INF/jsp/" />
<!-- 定义视图后缀格式 -->
<property name="suffix" value=".jsp" />
</bean>
</beans>

控制器

package com.springmvc.demo.controller;

import java.util.HashMap;
import java.util.Map;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.springmvc.demo.entity.User;

@Controller
@RequestMapping(value="/user")
public class UserController {

private Map<String,User> users = new HashMap<String, User>();

public UserController(){
users.put("suruonian", new User("suruonian","suruonian","suruonian@demo.com"));
users.put("linyunxi", new User("linyunxi","linyunxi","linyunxi@163.com"));
users.put("dennisit", new User("dennisit","dennisit","dennisit@163.com"));
users.put("moshaobai", new User("moshaobai","bing_he","1325103287@qq.com"));
}

/**
*
*
* Description:    构建REST风格 /user/users的GET请求时才执行该方法的操作RequestMethod.GET表示
*                 只处理GET请求
* @param model    用于上下文参数传递
* @return        视图页面 user/list  结合user-servlet.xml中配置的视图模型匹配视图页面
*                 实例中方法返回表示/WEB-INF/jsp/user/list.jsp页面
*
*/
@RequestMapping(value="/users",method=RequestMethod.GET)
public String list(Model model){
model.addAttribute("users", users);
return "user/list";
}

/**
*
*
* Description:    链接到页面时是GET请求,执行该方法 <a href="add">添加</a>
* @return        返回给用户添加页面
*
*/
@RequestMapping(value="/add",method=RequestMethod.GET)
public String add(Model model){
model.addAttribute("user",new User());    //开启ModelDriven 跳转到增加页面时使用该Model
return "user/add";
}

/**
*
* Description: 添加操作 请求/user/add  form表单提交时使用的post请求调用该方法
* @param user    添加的User对象
* @param br    验证绑定
* @return        视图页面
*                         添加成功 请求重定向redirect:/user/users 表示执行操作结束后请求定向为/user/users
*                         添加失败 页面转到/WEB-INF/jsp/add.jsp 这里有验证绑定,将在视图页面展示验证错误信息
*
*/
@RequestMapping(value="/add",method=RequestMethod.POST)
public String add(@Validated User user,BindingResult br){
//需要说明的是BindingResult形参一定要跟@Validated修饰的形参后面写验证
if(br.hasErrors()){        //如果有错误,直接跳转到添加视图
return "user/add";            //服务端跳转 该跳转会自动在前面增加 forward
}
users.put(user.getUsername(), user);
return "redirect:/user/users";    //客户端跳转 使用 redirect
}

/**
*
*
* Description:     查看操作 根据用户名查看  REST风格: /detail/查看的用户名
* @param username    带查看的用户名@PathVariable 修饰username 表示用请求路径中的username作为 形参
* @param model        携带数据的Model
* @return            视图页面 /WEB-INF/jsp/user/detail.jsp页面
*
*/
@RequestMapping(value="/{username}",method=RequestMethod.GET)
public String detail(@PathVariable String username, Model model){
System.out.println("获取到传入的参数值为:" + username);
model.addAttribute("user", users.get(username));
return "user/detail";
}

/**
*
*
* Description:        预更新操作根据用户名查询用户信息 然后数据交给携带体 展示到视图    REST风格: /更新的用户的用户名/update
* @param username    @PathVariable修饰 表示形参同URL中的请求参数
* @param model        携带数据的Model
* @return            视图页面/WEB-INF/jsp/user/update页面
*
*/
@RequestMapping(value="/{username}/update",method=RequestMethod.GET)
public String update(@PathVariable String username, Model model){
System.out.println("获取到传入的参数值为:" + username);
model.addAttribute(users.get(username));
return "user/update";
}

/**
*
*
* Description:        真正更新的操作    REST风格：    /更新的用户的用户名/update
* @param username    带更新的用户的用户名
* @param user        带更新的用户的信息对象    @Validated修饰表示信息需要被验证
* @param br        验证信息绑定对象 必须紧跟在待验证的信息形参后面
* @return            视图页面
*                              更新成功  请求重定向 /user/users
*                              更新失败      转到/WEB-INF/jsp/user/update.jsp页面
*
*/
@RequestMapping(value="/{username}/update",method=RequestMethod.POST)
public String update(@PathVariable String username, @Validated User user,BindingResult br){
if(br.hasErrors()){        //如果有错误,直接跳转到修改视图
return "user/update";
}
users.put(username, user);
return "redirect:/user/users";
}

/**
*
*
* Description:        删除操作 REST风格:/删除的用户名/delete
* @param username    删除的用户名        类似表主键,可以标记到整个记录信息
* @return            视图页面
*                               请求重定向到 /user/users
*
*/
@RequestMapping(value="/{username}/delete",method=RequestMethod.GET)
public String delete(@PathVariable String username){
System.out.println("获取到传入的参数值为:" + username);
users.remove(username);
return "redirect:/user/users";
}
}

视图层/WEB-INF/jsp/user/下的list.jsp,add.jsp,detail.jsp,update.jsp文件
list.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path;
%>

<!DOCTYPE HTML>
<html>
<head>
<base href="<%=basePath%>">
<title><%=basePath%></title>
</head>

<body>
<h2>用户信息展示</h2>   <p><a href="<%=basePath %>/user/add">添加信息</a></p>
<c:forEach items="${users}" var="usermap">
姓名:     <a href="<%=basePath %>/user/${usermap.value.username }">${usermap.value.username}  </a>
密码:    ${usermap.value.password }
邮箱:    ${usermap.value.email }
<a href="<%=basePath %>/user/${usermap.value.username }/update">修改</a>
<a href="<%=basePath %>/user/${usermap.value.username }/delete">删除</a>
<br/>
</c:forEach>
</body>
</html>

add.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="sf" uri="http://www.springframework.org/tags/form" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML>
<html>
<head>
<base href="<%=basePath%>">
<title><%=basePath%></title>
</head>

<body>
<h2>增加用户信息页面</h2> <br>
<!-- 此时没有写action,直接提交会提交给/add -->
<sf:form method="post" modelAttribute="user">
姓名:<sf:input path="username"/>  <sf:errors path="username" /> <br/>
密码:<sf:password path="password"/> <sf:errors path="password" /> <br/>
邮箱:<sf:input path="email"/> <sf:errors path="email" /> <br/>
<input type="submit" value="添加" />
</sf:form>
</body>
</html>

detail.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path;
%>

<!DOCTYPE HTML>
<html>
<head>
<base href="<%=basePath%>">
<title><%=basePath%></title>
</head>

<body>
<h2>用户详细信息页面</h2> <br>
姓名:     ${user.username}  <br>
密码:    ${user.password } <br>
邮箱:    ${user.email } <br/>
<a href="<%=basePath %>/user/users">返回用户列表</a>
</body>
</html>

update.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="sf" uri="http://www.springframework.org/tags/form" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path;
%>
<!DOCTYPE HTML>
<html>
<head>
<base href="<%=basePath%>">
<title><%=basePath%></title>
</head>

<body>
<h2>修改用户信息页面</h2> <br>
<!-- 此时没有写action,直接提交会提交给/update -->
<sf:form method="post" modelAttribute="user">
姓名:<sf:input path="username"/>  <sf:errors path="username" /> <br/>
密码:<sf:password path="password"/> <sf:errors path="password" /> <br/>
邮箱:<sf:input path="email"/> <sf:errors path="email" /> <br/>
<input type="submit" value="修改" />
</sf:form>
</body>
</html>

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