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>

转载请注明出处:[http://www.cnblogs.com/dennisit/archive/2013/04/13/3019391.html]