Spring4 Learning: The scope of a bean

Spring beans are scoped to four types: Singleton, prototype, session, and request.

There are two kinds of singleton and prototype commonly used. The other two are less of a use

Use the bean's scope property to configure the scope of the bean
Singleton: Default value. A bean instance is created when the container is initialized, and only one bean is created during the lifetime of the container, in the case of a singleton.
Prototype: prototype, container initialization does not create a bean instance, and a new bean instance is created and returned on each request.

For example:

Car.java:

Package Com.ksk.spring;public class Car {private String brand;    Private String Corp;    private int price;        private int maxspeed;    public void Setbrand (String brand) {This.brand = brand;    } public void Setprice (int price) {this.price = Price;    } public Car () {System.out.println ("init ...."); }}

Beans-scope.xml:

<?xml version= "1.0"  encoding= "UTF-8"? ><beans xmlns= "http://www.springframework.org/ Schema/beans "    xmlns:xsi=" Http://www.w3.org/2001/XMLSchema-instance "     xsi:schemalocation= "http://www.springframework.org/schema/beans http://www.springframework.org/ Schema/beans/spring-beans.xsd ">        <!--  Use the bean's scope property to configure the Bean's scope         singleton: Default value. A bean instance is created when the container is initialized, and only one bean is created during the lifetime of the container, in the case of a singleton.         prototype: Prototype, container initialization does not create a bean instance, and a new bean instance is created and returned on each request.      -->    <bean id= "Car"  class= " Com.ksk.spring.Car " scope=" Singleton ">        <property  name= "brand"  value= "Audi" ></property>        < Property name= "Price"  value= "30000 "></property>    </bean></beans> 

Main.java:

Package com.ksk.spring.beans.scope;import org.springframework.context.applicationcontext;import  org.springframework.context.support.classpathxmlapplicationcontext;import com.ksk.spring.car;public  class Main {        public static void  Main (String[] args)  {        applicationcontext ctx  = new classpathxmlapplicationcontext ("Beans-scope.xml");//         Car car =  (CAR)  ctx.getbean ("Car");//         Car car2 =  (CAR)  ctx.getbean ("Car");//         //        system.out.println (CAR);//         system.out.println (CAR2);//        //          system.out.println (car==car2);     }} when Scope= "singleton", the output is true when Scope= " Prototype ", the output is false.

This article from "My Youth I Master" blog, declined reprint!

Spring4 Learning: The scope of a bean