下面是官方文档对于@ResponseBody注解的解释:
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Mapping the response body with the @ResponseBody annotation
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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:
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@RequestMapping(path = "/something", method = RequestMethod.PUT)
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@ResponseBody
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public String helloWorld() {
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return "Hello World";
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}
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The above example will result in the text Hello World being written to the HTTP response stream.
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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:
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<bean
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class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
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<property name="messageConverters">
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<list>
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<ref bean="mappingJackson2HttpMessageConverter" />
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</list>
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</property>
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</bean>
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<bean id="mappingJackson2HttpMessageConverter"
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class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
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<property name="supportedMediaTypes">
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<list>
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<value>text/html;charset=UTF-8</value>
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<value>text/json;charset=UTF-8</value>
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<value>application/json;charset=UTF-8</value>
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</list>
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</property>
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</bean>
下面贴出在官方文档中的位置:

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:
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@RequestMapping("House/ClassManager/addByAjax")
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@ResponseBody
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public HanBlog_Class ClassManager_addByAjax(HttpServletRequest request){
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if(request.getSession().getAttribute("hanblog_uid")==null) return null;
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HanBlog_Class objClass=new HanBlog_Class();
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return objClass;
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}
jquery代码:
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//|增加
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$("#hanblog_add_btn").click(function(){
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var classname=$("#add_input_name").val();
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var classintroduction=$("#add_input_introduction").val();
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alert("分类名称:"+classname+"分类介绍:"+classintroduction);
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$.get("<c:url value="/House/ClassManager/addByAjax.do" />",function(result){
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alert(result);
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});
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});
运行返回例子:
