The resource identified by this request is only capable of generating responses with characteristics_description the resource identified by this reques-优快云博客

本文介绍了在Spring MVC 4.0.x中使用@ResponseBody注解返回JSON数据时出现406 Not Acceptable错误的原因及解决方法。分析了不同版本间处理请求头差异，并提供了多种解决策略。

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 HTTP Status 406 -  
   
 type Status report  
   
 message  
   
 description The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers.  
   
 Apache Tomcat/7.0.56

本文转自:http://www.tuicool.com/articles/FJnmAvY

spring 4.0.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的存在BUG，但是我使用的是3.1.x，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

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

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;  
}

4.0.x

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：

第一种：

退回3.1.x

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>