Spring MVC：@ResponseBody，415不支持的媒体类型 [英] Spring MVC: @ResponseBody, 415 Unsupported Media Type
问题描述
我无法将JSON Post映射到特定的Java Object以通过 Hibernate 保存它
Ajax调用的标题为正确设置...
接受application / json
Content-Type application / json; charset = UTF-8
并且HTTP方法是 POST p>
这是我的配置...
我的Spring MVC函数映射看起来像这样
@RequestMapping（value = {/save.json\"},method = RequestMethod.POST）
public ModelMap save（@RequestBody Seizure seizureObj，模型模型）{
...
}
在我的容器中xml I有一个像这样的 ContentNegotiatingViewResolver
< bean class =org.springframework.web.servlet。 view.ContentNegotiatingViewResolver>
< property name =mediaTypes>
< map>
< entry key =htmlvalue =text / html/>
< entry key =jsonvalue =application / json/>
< / map>
< / property>
< property name =viewResolvers>
< list>
< bean id =viewResolver
class =org.springframework.web.servlet.view.InternalResourceViewResolver>
< property name =prefixvalue =/ WEB-INF / assets //>
< property name =suffixvalue =。jsp/>
< / bean>
< / list>
< / property>
< property name =defaultViews>
< list>
< bean
class =org.springframework.web.servlet.view.json.MappingJacksonJsonView>
< property name =prefixJsonvalue =false/>
< property name =objectMapperref =jacksonObjectMapper/>
< / bean>
< / list>
< / property>
< / bean>
在我的容器xml杰克逊部分
< bean class =org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapterConfigurer
init-method =init>
< property name =messageConverters>
< list>
< bean id =marshallingHttpMessageConverter
class =org.springframework.http.converter.json.MappingJacksonHttpMessageConverter
>
< property name =objectMapperref =jacksonObjectMapper/>
< / bean>
< / list>
< / property>
< / bean>
< bean id =jacksonObjectMapperclass =org.codehaus.jackson.map.ObjectMapper/>
我有
在我的/ lib文件夹中
和Jackson适用于这样的简单情况
public class Simple {
private int id;
public int getId（）{
return id;
}
public void setId（int id）{
this.id = id;
$ b @RequestMapping（value = {/saveSimple.json\"},method = RequestMethod.POST）
public ModelMap save（@RequestBody Simple simple ，模型模型）{
...
}
当我测试它时curl
curl -v -HAccept：application / json-HContent-type：application / json - X POST -d'{id：1}'http：//< URL> /saveSimple.json
没有问题，但是如果用Hibernate对象测试它，我会得到消息
415不支持的介质类型
任何想法。
首先，我必须设置 @JsonManagedReference 和 @JsonBackReference 右键。我将ManagedReference设置为表示 ONE 关系的 ONE 的属性，但显然您必须将其设置为 MANY strong>属性（集合）
请参阅此处的说明
http://wiki.fasterxml.com/JacksonFeatureBiDirReferences
@JsonBackReference是引用的back部分：它将从序列化中被省略，并在反向引用的反序列化过程中重新构建。
- 带注释的属性必须是bean类型
>
在我的例子中，问题是我没有在我的JSON POST中发送足够的信息来匹配Hibernate要求。
这导致了一个异常，即我的JSON POST中创建Hibernate对象的适当字段不存在。
我创建了一个测试网址，我自己创建了对象映射器，并试图手动对JSON进行反序列化。这引发了正确的错误信息。
在我看来，Spring很遗憾地抛出了415个Unsupported Media Type异常，这有点误导。
所以为了未来。
ModelMap map = new ModelMap（）;
logger.info（HibernateAware）;
HibernateAwareObjectMapper mapper = new HibernateAwareObjectMapper（）;
String jsonInput =
{+
\id \：\1 \，+
\matCountry \ ：{+
\id \：\1 \+
}+
};
Seizure seizure = mapper.readValue（jsonInput，Seizure.class）; //此行引发异常
希望这可以帮助别人。
问候JS
I'm having trouble mapping a JSON Post to a particular Java Object to save it via Hibernate
Headers of the Ajax call are correctly set...
Accept application/json
Content-Type application/json; charset=UTF-8
and the HTTP-Method is POST
Here comes my configuration...
My Spring MVC function mapping looks like this
@RequestMapping(value = {"/save.json"},method = RequestMethod.POST)
public ModelMap save(@RequestBody Seizure seizureObj,Model model) {
...
}
in my container xml I have a ContentNegotiatingViewResolver like this
<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="mediaTypes">
<map>
<entry key="html" value="text/html" />
<entry key="json" value="application/json" />
</map>
</property>
<property name="viewResolvers">
<list>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/assets/" />
<property name="suffix" value=".jsp" />
</bean>
</list>
</property>
<property name="defaultViews">
<list>
<bean
class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
<property name="prefixJson" value="false" />
<property name="objectMapper" ref="jacksonObjectMapper" />
</bean>
</list>
</property>
</bean>
in my container xml the part for jackson
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapterConfigurer"
init-method="init">
<property name="messageConverters">
<list>
<bean id="marshallingHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"
>
<property name="objectMapper" ref="jacksonObjectMapper" />
</bean>
</list>
</property>
</bean>
<bean id="jacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper" />
I have
- jackson-core-asl-1.8.5
- jackson-mapper-asl-1.8.5
in my /lib folder
and Jackson works for a simple case like this
public class Simple {
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}
@RequestMapping(value = {"/saveSimple.json"},method = RequestMethod.POST)
public ModelMap save(@RequestBody Simple simple,Model model) {
...
}
when I test it with curl
curl -v -H "Accept: application/json" -H "Content-type: application/json" -X POST -d '{"id":1}' http://<URL>/saveSimple.json
No problems, but if I test it with the Hibernate object I get the message
415 Unsupported Media Type
any ideas.
StanMax lead my in the right direction...
First I had to set the @JsonManagedReference and @JsonBackReference right. I set the ManagedReference to the attribute which represents the ONE of of the ONE-to-MANY relationship, but apparently you have to set it to the MANY attribute (the collection)
see the description here http://wiki.fasterxml.com/JacksonFeatureBiDirReferences
@JsonBackReference is the "back" part of reference: it will be omitted from serialization, and re-constructed during deserialization of forward reference.
- Annotated property must be of bean type
The problem in my case was that I didn't send sufficient information in my JSON POST to match the Hibernate requirements.
This resulted in an Exception that the proper fields to create a Hibernate object out of my JSON POST, were not present.
I created a test url where I created the Object mapper myself and tried to de-serialize JSON by hand. This throw the right error message.
It seems to my that Spring unfortunately throws the 415 "Unsupported Media Type" exception which is a bit misleading.
So for the future. Try it out by hand first (see example included) and than go on.
ModelMap map = new ModelMap();
logger.info("HibernateAware");
HibernateAwareObjectMapper mapper = new HibernateAwareObjectMapper();
String jsonInput =
"{" +
"\"id\":\"1\"," +
"\"matCountry\":{" +
"\"id\":\"1\"" +
"}" +
"}";
Seizure seizure = mapper.readValue(jsonInput, Seizure.class); // this line throw the exception
Hope this helps someone.
Regards JS
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