SPRINGMVC Processor return Value object

The use of @controller and @responsebody requires the use of an HTTP message converter (Httpmessageconverter), and the opening of a message converter needs to be done by <mvc:annotation-driven/>. Seven Httpmessageconverter objects are created by default when the spring container is initialized <mvc:annotation-driven/>.

1. Introduction of the JAR package

<!--Jackson-core--        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-core</artifactId>            <version>2.8.9</version>        </ Dependency>        <!--jackson-databind--        <dependency>            <groupId> com.fasterxml.jackson.core</groupid>            <artifactId>jackson-databind</artifactId>            < Version>2.9.3</version>        </dependency>

　　

2. Create a Processor method (return string type)

Returns the string type    @RequestMapping (value = "/second", produces = "Text/html;charset=utf-8")//produces set encoding format    @ responsebody//Setting the response body public    Object Dosecond () {        return "Dosecond";    }

　　

(Returns a custom type)

Returns the custom type    @RequestMapping ("/third")//url    @ResponseBody//sets the response body public    Object Dothird () {        UserInfo U1=new UserInfo ();        U1.setusername ("Away from the Human Sorrow");        return u1;    }

　　

(Return collection type)

Returns the collection type    @RequestMapping ("/four")//url    @ResponseBody//sets the response body public    Object Dofour () {        list< Userinfo> list=new arraylist<userinfo> ();        Create two objects        UserInfo u1=new UserInfo ();        U1.setusername ("Away from the Human Sorrow");        UserInfo u2=new UserInfo ();        U2.setusername ("The Most beautiful Expectations");        Added to the list collection        List.add (U1);        List.add (U2);        Returns the list return        list;    

　　

3. Configuring the Message Converter

<!--View Resolver--   <bean id= "Methodnameresolver" class= " Org.springframework.web.servlet.view.InternalResourceViewResolver ">       <property name=" prefix "value="/"/ >       <property name= "suffix" value= ". jsp"/>   </bean><!--http Converter on and    <MVC: Annotation-driven/>    <!--scanning package all labeled Class--    <context:component-scan base-package= " Cn.happy.day08Object "/>

　　

4. Using AJAX to receive data

<% @page language= "java" pageencoding= "Utf-8" contenttype= "text/html; Utf-8 "%>
　　
 Springmvc Processor return value object