REST+Spring+POST with custom marshaller
I am developing RESTful API for my application. All getters (that use HTTP GET) work fine. I cannot make save method (that uses POST) to work.
I am using HTML form and RESTClient for testing.
Here is my Controller
@Controller
public class EntitiesController {
@RequestMapping(value="/ci/save/", method = RequestMethod.POST)
public ModelAndView saveConfigurationItem(@RequestBody ConfigurationItem body) {
System.out.println("saveConfigurationItem: body=" + body);
return createModelAndView("ci", Collections.emptyList());
}
}
This method is expected to be called when client posts ConfigurationItem. I am using custom serialization format. It is not XML or JSON. It is VCard or VCalendar format. For my first test I used the following VCard:
BEGIN:VCARD
N:Pooh;Winnie
FN:Winnie the Pooh
TEL:tel:+441234567
END:VCARD
I posted it to URL http://localhost:8080/core.solution-1.0/data/ci/save/
.
Here is the response I get:
415
The server refused this request because the request entity is in a format not
supported by the requested resource for the requested method ()
(*) ConfigurationItem is an abstract class. CardEntry extends it. I tried both.
I tried to change the method parameter to String
. In this case the method is called but the string is empty. The same happens when following one of recommendations I saw in web I changed the parameter type to MultiValueMap and sent request from simple HTML form.
I saw that marshal() is not called at all.
What's wrong?
Here is what I have. (I put here relevant code only.)
Spring configuration
<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:oxm="http://www.springframework.org/schema/oxm"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-3.0.xsd">
<import resource="classes/spring-config-prod.xml"/>
<context:component-scan base-package="com.mycompany.solution.service" />
<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
<bean id="ciCardView" class="com.mycompany.solution.service.VFormatView">
<constructor-arg>
<bean class="com.mycompany.solution.service.VFormatMarshaller">
<property name="packagesToScan" value="com.mycompany.solution.entity"/>
</bean>
</constructor-arg>
</bean>
</beans>
Marshaller
public class VFormatMarshaller implements Marshaller, Unmarshaller {
@Override
public void marshal(Object obj, Result result)
throws IOException/*, XmlMappingException*/ {
System.out.println("VFormatMarshaller.marshal(" + obj + ")");
marshalStreamResult(obj, (StreamResult)result);
}
@Override
public boolean supports(Class<?> paramClass) {
System.out.println("VFormatMarshaller.supports(" + paramClass + ")");
boolean supports = new HashSet<String>(Arrays.asList(packagesToScan)).contains(paramClass.getPackage().getName());
if (supports) {
return supports;
开发者_JAVA技巧 }
return Collection.class.isAssignableFrom(paramClass);
}
@Override
public Object unmarshal(Source source) throws IOException/*, XmlMappingException*/ {
System.out.println("VFormatMarshaller.unmarshal(" + source + ")");
return unmarshalStreamSource((StreamSource)source);
}
//// .............................
}
View (this is written only to override the content type)
public class VFormatView extends MarshallingView {
public VFormatView() {
super();
setContentType("application/vcard");
System.out.println("VFormatView()");
}
public VFormatView(Marshaller marshaller) {
super(marshaller);
setContentType("application/vcard");
System.out.println("VFormatView(" + marshaller + ")");
}
}
@RequestBody
/@ResponseBody
are supported by an hierarchy of HttpMessageConverter
s, that is completely different from ViewResolver
s.
In you case you need to configure a MarshallingHttpMessageConverter
with appropriate marshaller/unmarshaller and content type (or create your own HttpMessageConverter
if you don't need to depend on the existing implementation of marshaller/unmarshaller), and supply a configured instance to AnnotationMethodHandlerAdapter
.
The least intrusive way to configure a custom HttpMessageConveter
is to create a BeanPostProcessor
as follows:
public class Configurer implements BeanPostProcessor {
public void postProcessAfterInitialization(String name, Object bean) {
if (bean instanceof AnnotationMethodHandlerAdapter) {
AnnotationMethodHandlerAdapter a = (AnnotationMethodHandlerAdapter) bean;
HttpMessageConverter[] convs = a.getMessageConverters();
... add new converter ...
a.setMessageConverters(convs);
}
}
...
}
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