Springmvc 4.x利用@ResponseBody返回Json数据
下面是官方文档对于@ResponseBody注解的解释:
- Mapping the response body with the @ResponseBody annotation
- The @ResponseBody annotation is similar to @RequestBody. This annotation can be put on a method and indicates that the return type should be written straight to the HTTP response body (and not placed in a Model, or interpreted as a view name). For example:
- @RequestMapping(path = "/something", method = RequestMethod.PUT)
- @ResponseBody
- public String helloWorld() {
- return "Hello World";
- }
- The above example will result in the text Hello World being written to the HTTP response stream.
- As with @RequestBody, Spring converts the returned object to a response body by using an HttpMessageConverter. For more information on these converters, see the previous section and Message Converters.
@ResopnseBody注解能够 直接把 控制器返回变量(String)直接 返回给浏览器,也可以通过配置 后,把 对象 序列化成Json数据返回给浏览器!如果为 null 就会返回空白。
怎么配置呢 ?需要配置MessageConverter:
- <bean
- class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
- <property name="messageConverters">
- <list>
- <ref bean="mappingJackson2HttpMessageConverter" />
- </list>
- </property>
- </bean>
- <bean id="mappingJackson2HttpMessageConverter"
- class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
- <property name="supportedMediaTypes">
- <list>
- <value>text/html;charset=UTF-8</value>
- <value>text/json;charset=UTF-8</value>
- <value>application/json;charset=UTF-8</value>
- </list>
- </property>
- </bean>
这个需要jackson jar包支持,需要 jackson-annotations,jackson-core,jackson-databind三个包,:
控制器代码:
- @RequestMapping("House/ClassManager/addByAjax")
- @ResponseBody
- public HanBlog_Class ClassManager_addByAjax(HttpServletRequest request){
- if(request.getSession().getAttribute("hanblog_uid")==null) return null;
- HanBlog_Class objClass=new HanBlog_Class();
- return objClass;
- }
- //|增加
- $("#hanblog_add_btn").click(function(){
- var classname=$("#add_input_name").val();
- var classintroduction=$("#add_input_introduction").val();
- alert("分类名称:"+classname+"分类介绍:"+classintroduction);
- $.get("<c:url value="/House/ClassManager/addByAjax.do" />",function(result){
- alert(result);
- });
- });
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