Spring MVC returns JSON

The server side returns the text, the client obtains the text to convert the text to JSON, the server side transforms the object into the JSON text form, and needs to set the text the type to be text/plain,charset=utf-8

So add stringconverter and jsonconvert beans and servlet MVC annotation processing adapters in Application-context

<bean id="Stringconverter"

class="Org.springframework.http.converter.StringHttpMessageConverter">

<property name="Supportedmediatypes">

<list>

<value>text/plain; CharSet=utf-8</value>

</list>

</property>

</bean>

<!--used to convert an object to JSON--

<bean id="Jsonconverter"

class="Org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>

<bean

class="Org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">

<property name="Messageconverters">

<list>

<ref bean="Stringconverter" />

<ref bean="Jsonconverter" />

</list>

</property>

</bean>

In the controller function to indicate that the return value is responsebody content

@RequestMapping ("/ajax2.do")

public @ResponseBody UserInfo ajax2 (String userId) {

System. out. println (userId);

UserInfo user = new UserInfo ();

if ("1001". Equals (UserId)) {

User.setuserid (1001);

User.setusername ("Goku");

}Else{

User.setuserid (1002);

User.setusername ("eight commandments");

}

return user;

}

Js Code

$ ("#but2"). Click (function() {

$.post ("Ajax2.do", {userid:$ ("#userId2"). Val ()},function(data) {

$ ("#info2"). html (data.userid+ "---" +data.username);

}, "JSON");

});

Spring MVC returns JSON