首先，如果是maven工程的话，需要在pom.xml文件中添加下方依赖<dependency><groupId>net.sf.json-lib</groupId><artifactId>json-lib</artifactId><version>2.4</version><classifier>jdk15</classifier></dependency><!-- json解析包 --><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.5.2</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.5.2</version></dependency>

前台ajax:var data={"data":"哈哈"};$.ajax({type:"post",contentType:"application/json;charset=UTF-8",//一般报415错误都是没设置这个headers:{"Content-Type":"application/json;charset=UTF-8"},url:"${pageContext.request.contextPath}/admin/tests",data:JSON.stringify(data),//如果没有转为json字符串，可能会报400错误dataType:"json",success:function(data){alert(data);},error: function (XMLHttpRequest, textStatus, errorThrown) {alert(XMLHttpRequest.status+"d"+XMLHttpRequest.readyState+"d"+errorThrown);}})后台接收：@RequestMapping(value="tests",method = {RequestMethod.POST })@ResponseBody public String tests(@RequestBody JSONObject data){String majorID=data.getString("data");system.out.println(majorID);return "null";}前台提交2：//也可以data:$("表单").serialize()来进行提交，这样子的话后台直接新建一个跟表单一样的实体类即可对应的后台接收2：@RequestMapping(value="tests",method = {RequestMethod.POST })@ResponseBody public String tests(@RequestBody User user){//自己新建一个跟表单一样类，属性跟表单的name一样即可自动赋值上去}