Spring 3.2.* MVC通过Ajax获取JSON数据报406错误

学习笔记，转自：http://blog.csdn.net/gbtyy/article/details/17165605

 

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/html
            json=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