Spring MVC 3.1 annotation: @ResponseBody return JSON data __js

Pring How MVC returns JSON data, there are probably several:

Spring MVC 3.0 method to return JSON data
1. Direct PrintWriter output
2. Use JSP view
3. Using Spring's built-in support

The following are the configurations before 3.1:

<bean class= "Org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >
 < Property name= "Messageconverters" >
  <list>
   <bean
    class= " Org.springframework.http.converter.json.MappingJacksonHttpMessageConverter "/>
  </list>
 </ Property>
</bean>

here's the point.

The following configuration is 3.1 :

Use requestmappinghandlermapping and requestmappinghandleradapter after spring MVC 3.1

instead of the original defaultmethodhandlermapping and Annotationmethodhandleradapter,

So, 3.1 of the return JSON configuration can be configured with the following:

<bean
class= "Org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"
		p: Ignoredefaultmodelonredirect= "true" >
			<property name= "Messageconverters" >
				<list>
					< Bean class= "Org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>
				</list>
			</property>
		</bean>

Add in Web-inf/lib
Jackson-mapper-asl-1.6.4.jar
Jackson-core-asl-1.6.4.jar
Used in Controller: @ResponseBody callout method, which returns a Java object (supports complex objects).

Such as:

Public  @ResponseBody   user getuser (user u) {return
	u;
}

Mappingjacksonhttpmessageconverter converts an object to JSON output

Note : When <mvc:annotation-driven/> is used in Springmvc-servlet.xml, the default is injected if it is 3.1 Annotationmethodhandleradapter, after 3.1, the default injection requestmappinghandleradapter only add the jar package mentioned above!

Note: By default, Mappingjacksonhttpmessageconverter sets the content to Application/json, and returns a prompt download under IE9, which allows you to manually specify header information as " Text/html ", or" */* "(all, not sure to set this)

if it is manually injected Requestmappinghandleradapter can be set this way

	<bean
		class= "Org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"
		p: Ignoredefaultmodelonredirect= "true" >
		<property name= "Messageconverters" >
			<list>
				<bean
					class= "Org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"
					p: supportedmediatypes= "*/*"/>
			</list>
		</property>
	</bean>

If you use the Mvc:annotation-driven tag, you can inject information like this

<mvc:annotation-driven>
		<mvc:message-converters register-defaults= "true" >
			<bean
					class= "Org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"
					p:supportedmediatypes= " */* "/>
		</mvc:message-converters>
	</mvc:annotation-driven>

4. Custom

Configure Beannameviewresolver
<bean class= "Org.springframework.web.servlet.view.BeanNameViewResolver" >
 <property name= "Order" value= "1"/> </bean> <bean id= "Jsonview"
test. Testjsonview "/>

Implement Testjsonview public
class Testjsonview extends Abstractview {
 @Override
 protected void Rendermergedoutputmodel (map<string, object> model, httpservletrequest request,
         HttpServletResponse Response) throws Exception {
  jsonbuilder jb = new Jsonbuilder ();
  PrintWriter out = Response.getwriter ();
  Out.print (Jb.encode (model));
 }

Controller can be written in this way:
modelandview mav = new Modelandview ("Jsonview");
Mav.addobject ... return MAV;

Source: http://yjflfliulei.iteye.com/blog/1755134