Return value of the processor method in Ssm-springmvc-21:springmvc object

------------I do not have him, but the hand is ripe, humble and foolish, and eager to be hungry-------------

Today to record is the processing method, the return value is the kind of object, I gave it a bit of the class:

1. The return value is an object value (for example, 1), 2. A string type that returns a value of object (for example, "I am not Chinese"), 3. Returns the object type with the value object (for example, a custom UserInfo type Object ). 4. Return a collection type with a value of object (for example, a list collection of userinfo)

Requires annotations in a core:<mvc:annotation-driven></mvc:annotation-driven> configuration file to drive this node

and jar Bag, Jackson's

        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId> jackson-core</artifactid>            <version>2.8.  1</version>        </dependency>        <dependency>            <groupId> com.fasterxml.jackson.core</groupid>            <artifactId>jackson-databind</artifactId>            < version>2.5. 1</version>        </dependency>

So: Start a case, (the code used in a case is not repeated in two, three, four cases, and so on, and will simply mention it inside)

One, the return value is an object value

1. First prepare a processor, which adds case one to the processing method

Package Cn.dawn.day12return;import Org.springframework.stereotype.controller;import Org.springframework.web.bind.annotation.requestbody;import Org.springframework.web.bind.annotation.requestmapping;import Org.springframework.web.bind.annotation.responsebody;import Java.util.arraylist;import java.util.List;/** * Created by Dawn on 2018/3/28.*/@Controller Public classReturnobjectcontroller {/*return value object numeric type*/@RequestMapping ("/returnobjint") @ResponseBody PublicObject Returnobjint () {return 1; }}

2. An XML configuration file is required: (unlike in the past, note drivers need to be configured)

<?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:mvc="Http://www.springframework.org/schema/mvc"Xmlns:context="Http://www.springframework.org/schema/context"xsi:schemalocation="Http://www.springframework.org/schema/beanshttp//www.springframework.org/schema/beans/spring-beans.xsdhttp//Www.springframework.org/schema/mvchttp//www.springframework.org/schema/mvc/spring-mvc.xsdhttp//Www.springframework.org/schema/contexthttp//www.springframework.org/schema/context/spring-context.xsd "><!--package Scanner--<context:component-scanBase-package="Cn.dawn.day12return"></context:component-scan> <!--View Resolver-<beanclass="Org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix"Value="/"></property> <property name="suffix"Value=". JSP"></property> </bean> <!--note-driven <mvc:annotation-driven></mvc:annotation-driven> </beans>

3.web.xml Dispatch the central scheduler to the XML above, you will not give the source.

4. Go to Web URL to access it, OK

Two, a string type that returns a value of object

1. Treatment Method:

    /* returns the value of the string type of object */ "/returnobjstr" "Text/html;charset=utf-8"        )    @ResponseBody    public  Object returnobjstr () {        return  " I am not Chinese?" ";    }

This out specifies the encoding of the returned page, Utf-8, if not returned will be garbled

2. Own configuration xml,web.xml with the above, because the processing method, in the above a processor class

3. Access via URL

Three, object type with return value of

1. Define a UserInfo entity class;

Package Cn.dawn.day12return;/** * Created by Dawn on 2018/3/26.*/ Public classUserInfo {PrivateString username; PrivateString password;  PublicUserInfo () {} PublicUserInfo (string Username, string password) { This. Username =username;  This. Password =password; }     PublicString GetUserName () {returnusername; }     Public voidSetusername (String username) { This. Username =username; }     PublicString GetPassword () {returnpassword; }     Public voidSetPassword (String password) { This. Password =password; }}

2. Defining the Processor method

    /* The return value of the object objects user type */  "/returnobjuser")    @ResponseBody    public      Object Returnobjuser () {        UserInfo u1=new UserInfo (" Mengliu " ,"123");         return U1;    }

3. Custom configuration XML file, Web.

4. Access via web URL

Four, a collection type that returns a value of object

1.UserInfo with the above is good:

2. Define the processing method:

    /*returns the collection of Value object object user*/@RequestMapping (Value="/returnobjuserlist") @ResponseBody PublicObject returnobjuserlist () {List<UserInfo> lists=NewArraylist<userinfo>(); UserInfo U1=NewUserInfo ("Mengliu","123"); UserInfo U2=NewUserInfo ("Meng Qi","123");        Lists.add (U1);        Lists.add (U2); returnlists; }

3. Custom configuration XML file, Web.

4. Define a JSP page where I write Ajax and parse the returned List<userinfo> object

<%@ page language="Java"pageencoding="Utf-8"Iselignored="false"%>"Text/javascript"Src="${pagecontext.request.contextpath}/js/jquery-1.8.3.min.js"></script> <script type="Text/javascript">$ (function () {$ ("input"). On ("Click", function () {$.ajax ({URL:"${pagecontext.request.contextpath}/returnobjuserlist", success:function (date) {alert (typeofdate);                        $.each (Date,function (i, item) {alert (item.username);            })                    }                });        });    }); </script>"image/1.jpg">--%><input type="Button"Value="I am in a windowless black house, living six people, a person all night writing code, Comfort my Lonely heart"/></body>
5. Start Tomcat, access the JSP, click Use
Return value of the processor method in Ssm-springmvc-21:springmvc object