Spring JQuery/Ajax 进行 Json请求

I'm very new to JSON/Spring MVC and am trying to get a simple example of an AJAX call to a Spring MVC controller - but I keep returning an error of 400 - Bad Request.  

After scouring the Internet, I've found that this is usually caused by not setting the appropriate content type - but [I believe] I have done that.

Here is my AJAX call:

    //validate the object     var urlString = "/ajax/add/";      $.ajax({         type:"POST",         url: urlString,         contentType: "application/json; charset=utf-8",         dataType: "json",          data: {value1: 'apples', value2 : 'oranges'},         success: function(result){             alert("success");         },         error: function(jqXHR, textStatus, errorThrown){             alert("error:" + textStatus + " exception:" + errorThrown);         }      }) ; 

And my controller:

@Controller itpublic class AddController {  private static Logger m_log = null;  @RequestMapping(value = "/ajax/add") public String handle(@RequestBody String json){      DummyClass dummyRequest;     try {          ObjectMapper mapper = new ObjectMapper();         dummyRequest = mapper.readValue(json, DummyClass.class);         m_log.info("Value1: " + dummyRequest.getValue1());         m_log.info("Value2: " + dummyRequest.getValue2());     }  catch (Exception e) {      }     finally{       }     return "called"; } 

Can anyone help me out?

edit

Here is my context that I use to configure Spring:

 <?xml version="1.0" encoding="UTF-8"?>  <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd     http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">  <context:component-scan base-package="com.project.do" />  <!--<mvc:annotation-driven/> -->  <bean class="com.project.do.interceptors.handler.mapping.HandlerInterceptorAnnotationAwareHandlerMapping "/>  <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />  <bean class="com.project.do.viewresolver.ProjectViewResolver" >     <property name="tilesResolver" ref="tilesResolver" />     <property name="jspResolver" ref="jspResolver" /> </bean>  <bean id="tilesResolver" class ="org.springframework.web.servlet.view.UrlBasedViewResolver">     <property name="viewClass" value="org.springframework.web.servlet.view.tiles2.TilesView" />     <property name="order" value="2" /> </bean>  <bean id="jspResolver"     class="org.springframework.web.servlet.view.InternalResourceViewResolver">     <property name="prefix" value="/WEB-INF/jsp/" />     <property name="suffix" value=".jsp" />     <property name="order" value="3" /> </bean>  <bean id ="tilesConfigurer" class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">     <property name="definitions" value="/WEB-INF/tiles/tiles.xml" />     <property name="preparerFactoryClass" value="org.springframework.web.servlet.view.tiles2.SpringBeanPreparerFactory"/> </bean>  <mvc:resources mapping="/css/**" location="/css/" /> <mvc:resources mapping="/js/**" location="/js/" /> <mvc:resources mapping="/images/**" location="/images/" /> <mvc:resources mapping="/javascript/**" location="/javascript/" /> <mvc:resources mapping="/scripts/**" location="/scripts/" /> <mvc:resources mapping="/styles/**" location="/styles/" /> <mvc:resources mapping="/help/**" location="/help/" />  <!-- <mvc:view-controller path="/" view-name="welcome"/> --> 

I should note that I have a working Controller with Ajax in the package com.project.do.working, but the nonworking Controller with Ajax and JSON is in the same package com.project.do.not.working

Spring框架介绍

 

I think your request mapping is not having the RequestMethod as POST. I guess by default it taking it a get request but your AJAX is a POST request. Try changing as below

@RequestMapping(value = "/ajax/add", method = RequestMethod.POST) public String handle(@RequestBody String json){ }