Spring Learning (6) Examples of---bean definitions and scope

A The definition of a bean

First define a Beanannotation

Package Com.mypackage;import Org.springframework.stereotype.Component, @Componentpublic class Beanannotation {public void Say (String args) {System.out.println ("beanannotation:" +args);}}

XML configuration:

<?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:context= "Http://www.springframework.org/schema /context "        xsi:schemalocation=" Http://www.springframework.org/schema/beans/            http Www.springframework.org/schema/beans/spring-beans-4.1.xsd            Http://www.springframework.org/schema/context            http://www.springframework.org/schema/context/spring-context-4.1.xsd ">                <context:component-scan Base-package= "Com.mypackage" >        </context:component-scan>    </beans>

Test:

Package Com.mypackage;import Org.junit.test;import Org.springframework.context.applicationcontext;import Org.springframework.context.support.classpathxmlapplicationcontext;public class UnitTest {@Testpublic void Test () { ApplicationContext context = new Classpathxmlapplicationcontext ("Classpath:spring-beansnnotation.xml");  Beanannotation bean= (beanannotation) Context.getbean ("Beanannotation"); Bean.say ("Test");}}

Test results:

2015-7-6 11:36:44 org.springframework.context.support.ClassPathXmlApplicationContext Preparerefresh Info: Refreshing Org[email protected]1342a80d:startup Date [Mon Jul 11:36:44 CST 2015]; Root of context hierarchy2015-7-6 11:36:44 Org.springframework.beans.factory.xml.XmlBeanDefinitionReader Loadbeandefinitions info: Loading XML Bean Definitions from class path resource [spring-beansnnotation.xml]beanannotation: Test

(ii) Scope instances

Specify the scope:

Package Com.mypackage;import Org.springframework.context.annotation.scope;import Org.springframework.stereotype.Component, @Scope ("Prototype") @Componentpublic class Beanannotation {public void Say ( String args) {System.out.println ("beanannotation:" +args);} public void Myhashcode () {System.out.println ("Beanannotation:" +this.hashcode ());}}

Configuration 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"        xmlns:context= "Http://www.springframework.org/schema /context "        xsi:schemalocation=" Http://www.springframework.org/schema/beans/            http Www.springframework.org/schema/beans/spring-beans-4.1.xsd            Http://www.springframework.org/schema/context            http://www.springframework.org/schema/context/spring-context-4.1.xsd ">                <context:component-scan Base-package= "Com.mypackage" >        </context:component-scan>    </beans>

Unit tests:

Package Com.mypackage;import Org.junit.test;import Org.springframework.context.applicationcontext;import Org.springframework.context.support.classpathxmlapplicationcontext;public class UnitTest {@Testpublic void Test () { ApplicationContext context = new Classpathxmlapplicationcontext ("Classpath:spring-beansnnotation.xml");  Beanannotation bean= (beanannotation) Context.getbean ("Beanannotation"); Bean.myhashcode (); Beanannotation bean11= (beanannotation) Context.getbean ("Beanannotation"); Bean11.myhashcode ();}}

Results:

2015-7-6 12:54:03 org.springframework.context.support.ClassPathXmlApplicationContext Preparerefresh Info: Refreshing Org[email protected]1342a80d:startup Date [Mon Jul 12:54:03 CST 2015]; Root of context hierarchy2015-7-6 12:54:03 Org.springframework.beans.factory.xml.XmlBeanDefinitionReader Loadbeandefinitions info: Loading XML Bean Definitions from class path resource [spring-beansnnotation.xml]beanannotation : 1617829356beanannotation:1567531625

The hashcode of a bean is not the same as two different objects.

Note the above @scope ("prototype"), which is @scope, that is, using the default value

The results obtained:

2015-7-6 13:00:30 org.springframework.context.support.ClassPathXmlApplicationContext Preparerefresh Info: Refreshing Org[email protected]1342a80d:startup Date [Mon Jul 13:00:30 CST 2015]; Root of context hierarchy2015-7-6 13:00:30 Org.springframework.beans.factory.xml.XmlBeanDefinitionReader Loadbeandefinitions info: Loading XML Bean Definitions from class path resource [spring-beansnnotation.xml]beanannotation : 1617829356beanannotation:1617829356

The description gets the same object.

Spring Learning (6) Examples of---bean definitions and scope