SpringMVC 返回json或xml格式

1、同一controller返回json或xml一种格式

@Controller  
@RequestMapping(value = "/**", method = RequestMethod.POST, consumes="application/json")  
【@RequestMapping(value = "/**", method = RequestMethod.POST, consumes="application/xml")】 
public void addPet(Model model) {     

}  
           

2、同一controller支持同时返回json和xml

在方法中不带后缀为默认返回格式，默认返回格式取决于 请求 Accept, 如果 accept=application/xml 则默认返回 xml格式的数据， 如果 accpet=application/json 则默认返回json格式的数据

<?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:util="http://www.springframework.org/schema/util"

    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.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd

         http://www.springframework.org/schema/util    

        http://www.springframework.org/schema/util/spring-util.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <mvc:annotation-driven/>

    <context:component-scan base-package="org.wash.*"/>

    <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">

    <property name="mediaTypes">

        <map>

            <entry key="atom" value="application/atom+xml"/>

            <entry key="html" value="text/html"/>

            <entry key="json" value="application/json"/>

        </map>

    </property>

    <property name="viewResolvers">

        <list>

            <bean class="org.springframework.web.servlet.view.BeanNameViewResolver"/>

            <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

             <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>

                <property name="prefix" value="/WEB-INF/views/"/>

                <property name="suffix" value=".jsp"/>

            </bean>

        </list>

    </property>

    <property name="defaultViews">

        <list>

            <bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView" />

        </list>

    </property>

</bean>

三、在controller中通过逻辑判断返回xml或json

@RequestMapping("/jsonOrView")  
public ModelAndView jsonOrView(@RequestParam String code){  
    if("test1".equalsIgnoreCase(code)){  
        ModelAndView mav = new ModelAndView("index");  
        return mav;  
    }else{  
        ModelAndView mav = new ModelAndView(new MappingJackson2JsonView());  
        mav.addObject("result", "failed");  
        return mav;  
    }  
}