SpringMVC JSON实现

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1.配置ViewResolver

在mvc-dispatcher-servlet.xml中配置ViewResolver

<bean        class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">        <property name="order" value="1" />        <property name="mediaTypes">            <map>//对应不同的数据形式                <entry key="json" value="application/json" />                <entry key="xml" value="application/xml" />                <entry key="htm" value="text/html" />            </map>        </property>

2.配置defaultViews

使用org.springframework.web.servlet.view.json.MappingJackson2JsonView工具将model转化为JSON形式

<property name="defaultViews">            <list>                <!-- JSON View -->                <bean                    class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">                </bean>            </list>        </property>

3.引入相关依赖

在POM.xml中的<properties> 标签中添加

<jackson.version>2.5.4</jackson.version>

然后添加jakson的依赖

<dependency>  <groupId>com.fasterxml.jackson.core</groupId>  <artifactId>jackson-databind</artifactId>  <version>${jackson.version}</version></dependency>

4.书写相关controller

有以下两种写法：
1——

@RequestMapping(value="/{courseId}",method=RequestMethod.GET)public @ResponseBody Course getCourseInJson(@PathVariable Integer courseId){        return  courseService.getCoursebyId(courseId);    }

2——

@RequestMapping(value="/jsontype/{courseId}",method=RequestMethod.GET)public  ResponseEntity<Course> getCourseInJson2(@PathVariable Integer courseId){        Course course =   courseService.getCoursebyId(courseId);                return new ResponseEntity<Course>(course, HttpStatus.OK);    }

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