SSM框架搭建看這篇http://blog.csdn.net/zhshulin/article/details/37956105

當需要把控制類升級為RESTController時，在spring-mvc.xml只需新增一句<mvc:annotation-driven  />

<?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:context="http://www.springframework.org/schema/context"  
    xmlns:mvc="http://www.springframework.org/schema/mvc"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans    
                        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd    
                        http://www.springframework.org/schema/context    
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd    
                        http://www.springframework.org/schema/mvc    
                        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">  
    <!-- 自動掃描該包，使SpringMVC認為包下用了@controller註解的類是控制器 -->  
    <context:component-scan base-package="com.luoka.weixin1545.controller" /> 
   
   	<!-- 添加註解驅動 enable-matrix-variables="true" -->
	<mvc:annotation-driven  /> 
    <!--避免IE執行AJAX時，返回JSON出現下載檔案 com.luoka.weixin1545.controller --> 
    <bean id="mappingJacksonHttpMessageConverter"  
        class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">  
        <property name="supportedMediaTypes">  
            <list>  
                <value>text/html;charset=UTF-8</value>  
            </list> 
        </property>  
    </bean>  
    <!-- 啟動SpringMVC的註解功能，完成請求和註解POJO的對映 -->  
    <bean  
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">  
        <property name="messageConverters">  
            <list>  
                <ref bean="mappingJacksonHttpMessageConverter" /> <!-- JSON轉換器 -->  
            </list>  
        </property>  
    </bean>  
    <!-- 定義跳轉的檔案的前後綴 ，檢視模式配置-->  
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
        <!-- 這裡的配置我的理解是自動給後面action的方法return的字串加上字首和字尾，變成一個 可用的url地址 -->  
        <property name="prefix" value="/WEB-INF/jsp/" />  
        <property name="suffix" value=".jsp" />  
    </bean>     
    <!-- 配置檔案上傳，如果沒有使用檔案上傳可以不用配置，當然如果不配，那麼配置檔案中也不必引入上傳元件包 -->  
    <bean id="multipartResolver"    
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    
        <!-- 預設編碼 -->  
        <property name="defaultEncoding" value="utf-8" />    
        <!-- 檔案大小最大值 -->  
        <property name="maxUploadSize" value="10485760000" />    
        <!-- 記憶體中的最大值 -->  
        <property name="maxInMemorySize" value="40960" />    
    </bean> 
</beans>
 

java原來控制類

@Controller  
@RequestMapping("user")
public class userController {
    @Resource  
    private IUserService userService;  
      
    @RequestMapping("/showUser") 
    public String toIndex(HttpServletRequest request,Model model){  
        int userId = Integer.parseInt(request.getParameter("id"));  
        User user = this.userService.getUserById(userId);  
        model.addAttribute("user", user);  
        return "showUser";  
    } 
}
 

@RestController
@RequestMapping("/user")
public class userController {  

	@Resource  
    private IUserService userService;  
      
    @RequestMapping("/{id}")
    public User GETUSER(@PathVariable Integer id){   
        User user = this.userService.getUserById(id);   
        return user;
    } 
}