Spring3 REST MVC框架,提速你的Web开发

最近在Java web 项目中需要采用非常简单的REST框架，Struts2、webwork、JSF 经过一番比较，最后选择了Spring3，理由只有一个 “简单，好用，并满足需要”。很久以前就Rod Johnson大叔说 Spring3 全面支持REST风格的Web服务，"We're really seeing extensive interest and growth in REST, and it will have comprehensive support for RESTful Web services," said Johnson，今天亲自尝试了一下，真有点相识恨晚的感觉，如果在这次项目运用没有太大的问题，将来在其他项目会大量运用。

工作原理如图所示：

*根据HTTP请求的URL，调用相应的DispatcherServlet控制器。
*提供一个视图是作为HTTP响应发送。

页面上最终运行效果，如图所示：

主要代码：

清单1：TopicController
package com.javabloger.springrest.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/topic")  //url映射的名称
public class TopicController {

    @RequestMapping(value = "/{id}",method=RequestMethod.GET)
    public String helloWorld(
            @PathVariable Long id,
            HttpServletRequest request,
            HttpServletResponse response) {
            request.setAttribute("message", "You Input Topci Id is: <b>"+id+"</b>");
        return  "topic" ;   // 对应 /WEB-INF/jsp 目录下的 topic.jsp 文件
    }
       
    @RequestMapping(value="/add")
    public String test(HttpServletRequest request,  
            HttpServletResponse response){
        System.out.println("Hello www.JavaBloger.com ");
        request.setAttribute("message", "Hello JavaBloger ! ,@RequestMapping(value='/add')");
        return "topic";  // 对应 /WEB-INF/jsp 目录下的 topic.jsp 文件
       
    }
}

清单2 :UserController
package com.javabloger.springrest.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.javabloger.springrest.pojo.Users;

@Controller
@RequestMapping("/user")

public class UserController {
     @RequestMapping(value="/login")
    public String test(HttpServletRequest request,  
            HttpServletResponse response,Users  userinfo){   // 非常方便可以直接在方法里面放入对象
         if (userinfo.getUsername().equals("username") &&
                 userinfo.getPassword().equals("password")
             )
         {
             request.setAttribute("user", userinfo);
             return "users/list";   //判断，将跳转不同的页面
         }
         else{
             return "users/loginerr";  //判断，将跳转不同的页面
         }
    }
}

清单3：web.xml
   <servlet>  
      <servlet-name>springmvc</servlet-name>  
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
      <load-on-startup>2</load-on-startup>  
   </servlet>  
 <servlet-mapping>  
     <servlet-name>springmvc</servlet-name>  
     <url-pattern>/</url-pattern>  
 </servlet-mapping>  

清单4:springmvc-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:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xsi:schemaLocation="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/tx 
            http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
            http://www.springframework.org/schema/jdbc 
            http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd">
    <bean
        class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
    <!– 自动搜索@Controller标注的类 –>
    <context:component-scan base-package="com.javabloger.springrest.action" />
    <bean
        class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
    <!– Default ViewResolver –>
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp"></property>
    </bean>
    <bean id="messageSource"
        class="org.springframework.context.support.ResourceBundleMessageSource"
        p:basename="i18n/messages" />
</beans>