来源:http://blog.youkuaiyun.com/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