Spring 3.2.* MVC通过Ajax获取JSON数据报406错误

Spring 3.2.x通过@ResponseBody标签返回JSON数据的方法都报406错： Failed to load resource: the server responded with a status of 406 (Not Acceptable) 以及报错描述： The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers () 于是，百度、Google了半天，发现遇到此问题的人挺多的，但是都是说什么添加Jackson什么的，我是采用的fastjson，换成Jackson尝试了半天均还是406。 后来在stackoverflow有人说是Spring 3.2的BUG，于是退回到3.1.*，不再报406了， 虽然换回3.1不报错了，但还是想看看在处理ajax返回json数据的方式上两个版本到底有何区别，debug之。 debug到org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(T returnValue,MethodParameter returnType,ServletServerHttpRequest inputMessage,ServletServerHttpResponse outputMessage)，在以下代码处抛出了异常：

if (compatibleMediaTypes.isEmpty()) {    throw new HttpMediaTypeNotAcceptableException(allSupportedMediaTypes);}

看来是compatibleMediaTypes为空导致。看debug信息，经过比较发现3.1的requestedMediaTypes为[*/*]，而3.2的requestedMediaTypes却为[text/html]，producibleMediaTypes都是[application/json],继而发现获取acceptableMediaTypes的方式3.1与3.2不同 3.1的

3.1的

private List<MediaType> getAcceptableMediaTypes(HttpInputMessage inputMessage) {        try {            List<MediaType> result = inputMessage.getHeaders().getAccept();            return result.isEmpty() ? Collections.singletonList(MediaType.ALL) : result;        } catch (IllegalArgumentException ex) {            if (logger.isDebugEnabled()) {                logger.debug("Could not parse Accept header: " + ex.getMessage());            }            return Collections.emptyList();        }    }

3.2的

private List<MediaType> getAcceptableMediaTypes(HttpServletRequest request) throws HttpMediaTypeNotAcceptableException {        List<MediaType> mediaTypes = this.contentNegotiationManager.resolveMediaTypes(new ServletWebRequest(request));        return mediaTypes.isEmpty() ? Collections.singletonList(MediaType.ALL) : mediaTypes;    }

看来问题就是出在这里了。不知Spring为何改变该实现方式？？！！ 

解决方法如下：

一、第一种 继续用Spring 3.1.4。

二、第二种

<?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:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"xmlns:mvc="http://www.springframework.org/schema/mvc"     xsi:schemaLocation="http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd         http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context-3.0.xsd         http://www.springframework.org/schema/aop         http://www.springframework.org/schema/aop/spring-aop-3.0.xsd         http://www.springframework.org/schema/tx          http://www.springframework.org/schema/tx/spring-tx-3.0.xsd         http://www.springframework.org/schema/mvc           http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

把spring-mvc-3.0.xsd 升级到 spring-mvc-3.2.xsd

<?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:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd         http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context-3.0.xsd         http://www.springframework.org/schema/aop         http://www.springframework.org/schema/aop/spring-aop-3.0.xsd         http://www.springframework.org/schema/tx          http://www.springframework.org/schema/tx/spring-tx-3.0.xsd        http://www.springframework.org/schema/mvc         http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

然后把<mvc:annotation-driven>修改成如下格式

<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager" /> <bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean"> <property name="favorPathExtension" value="false" /><property name="favorParameter" value="false" /> <property name="ignoreAcceptHeader" value="false" /> <property name="mediaTypes" > <value>atom=application/atom+xml html=text/htmljson=application/json*=*/*</value> </property></bean>

三、第三种

详情见下面的地址点击打开链接

四、第四种

spring 3.2时requestedMediaTypes却为[text/html]的情况报406错误，还有一个原因可能是由于采用的后缀有关，如果使用*.htm,*.html等，默认就会采用[text/html]编码，若改成*.json,*.shtml等就OK