Spring 3.2.x methods that return JSON data through the @ResponseBody tag all report 406 errors: Failed to load resource: the server responded with a status of 406 (Not Acceptable) and an error description: The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers () So, Baidu and Google for a long time, and found that many people encountered this problem, but they all say that the addition of Jackson or something, I use fastjson, Switched to Jackson and tried 406 for half a day. Later on stackoverflow, some people said that it was a bug in Spring 3.2, so it returned to 3.1. *, And no longer reported 406. Although it is not reported as an error in 3.1, I still want to see the two versions in the way of processing ajax to return json data. What's the difference, debug it. Debug to org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters (T returnValue, MethodParameter returnType, ServletServerHttpRequest inputMessage, ServletServerHttpResponse outputMessage), and throw an exception at the following code:
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if (compatibleMediaTypes.isEmpty ()) {
throw new HttpMediaTypeNotAcceptableException (allSupportedMediaTypes);
}
It seems that compatibleMediaTypes is empty. Looking at the debug information, after comparison, it was found that the requestedMediaTypes of 3.1 was [* / *], while the requestedMediaTypes of 3.2 were [text / html], and the producedMediaTypes were all [application / json], and then it was found that the method 3.1 for obtaining acceptableMediaTypes is different from 3.2 for 3.1
3.1
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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
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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;
}
It seems that the problem lies here. I wonder why Spring changed the implementation? ? !! !!
The solution is as follows:
First, continue to use Spring 3.1.4.
Second, the second
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<? 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 ">
Upgrade spring-mvc-3.0.xsd to spring-mvc-3.2.xsd
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<? 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 ">
Then modify <mvc: annotation-driven> to the following format
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<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>
Third, the third
See the address below for details
Fourth, the fourth
In Spring 3.2, when the requestedMediaTypes is [text / html], it reports a 406 error. Another reason may be that the suffix used is related. If you use * .htm, * .html, etc., it will use [text / html] encoding by default. If you change it to * .json, * .shtml, etc.
Article source: http://blog.csdn.net/gbtyy/article/details/17165605
Spring 3.2. * MVC gets JSON datagram 406 error via Ajax
