Springmvc 4.x利用@ResponseBody返回Json資料
阿新 • • 發佈:2019-01-22
下面是官方文件對於@ResponseBody註解的解釋:
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註解能夠 直接把 控制器返回變數(String)直接 返回給瀏覽器,也可以通過配置 後,把 物件 序列化成Json資料返回給瀏覽器!如果為 null 就會返回空白。
怎麼配置呢 ?需要配置MessageConverter:
下面貼出在官方文件中的位置:<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>
這個需要jackson jar包支援,需要 jackson-annotations,jackson-core,jackson-databind三個包,:
控制器程式碼:
jquery程式碼:@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("分類名稱:"+classname+"分類介紹:"+classintroduction);
$.get("<c:url value="/House/ClassManager/addByAjax.do" />",function(result){
alert(result);
});
});
執行返回例子: