Simplifying XML configuration with Java Config in spring

Personal feeling is the most flexible way to configure.

Package Com.baobaotao.conf;public class Logdao {public void print () {System.out.println ("HelloWorld"); }}

Package Com.baobaotao.conf;public class Userdao {public void print () {System.out.println ("Helloworld"); }}

Package Com.baobaotao.conf;public class Logonservice {public Userdao Userdao;    Public Logdao Logdao;    public void Setlogdao (Logdao logdao) {This.logdao = Logdao;    } public void Setuserdao (Userdao userdao) {This.userdao = Userdao;    } public void print () {System.out.println ("HelloWorld"); }}

Define the above 3 classes first. Then we'll test it.

Package com.baobaotao.conf;import org.springframework.beans.factory.annotation.configurable;import  org.springframework.context.annotation.Bean; @Configurablepublic  class AppConf {     //  The following two methods define two beans and provide the bean instantiation logic      @Bean      Public userdao userdao ()  {        return new  Userdao ();    }     @Bean     public logdao  logdao ()  {        return new logdao ();     }    //  defines Logonservice's bean     @Bean      public logonservice logonservice ()  {         logonservice logonservice = new logonservice ();         //  The bean defined aboveInjected into the Logonservice bean         logonservice.setlogdao (LogDao ());         logonservice.setuserdao (Userdao ());         return logonservice;    }    }

The Test class.

Package Com.baobaotao.conf;import Org.junit.test;import Org.springframework.context.annotation.annotationconfigapplicationcontext;public class ConfigTest {@Test public voi        D Test () {Annotationconfigapplicationcontext ac = new Annotationconfigapplicationcontext (appconf.class);        Logonservice Logonservice = Ac.getbean (Logonservice.class);    Logonservice.print (); }}

If the bean is defined in more than one @configuration.

package com.baobaotao.conf;import  org.springframework.context.annotation.bean;import org.springframework.context.annotation.configuration;@ configurationpublic class daoconfig {     @Bean      Public userdao userdao () {        return new  Userdao ();    }         @Bean      public logdao logdao () {        return new  Logdao ();     }} 

Package com.baobaotao.conf;import org.springframework.beans.factory.annotation.autowired;import  org.springframework.context.annotation.Bean; @Configurationpublic  class serviceconfig {     //like a regular bean. daoconfig     @Autowired      private   daoconfig daoconfig;         @Bean      public logonservice logonservice () {         logonservice logonservice = new logonservice ();         //, like a normal bean, invokes the bean-related method         logonservice.setlogdao ( Daoconfig.logdao ());         logonservice.setuserdao (DaoConfig.userDao ( ));         return logonservice;    }}

Because @configuration is annotated by @component, it means that the class that is annotated by @configuration can be scanned by spring's <context:component-scan>. The @autowired can be used for automatic assembly.

XML configuration file

<?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"     xmlns:aop= "http// Www.springframework.org/schema/aop "    xmlns:tx=" Http://www.springframework.org/schema/tx "     xmlns:jdbc= "Http://www.springframework.org/schema/jdbc"     xmlns:p = "http://www.springframework.org/schema/p"     xmlns:util= "http://www.springframework.org/ Schema/util "    xsi:schemalocation=" http://www.springframework.org/schema/jdbc http:/ /www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd        http:/ /www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd         http://www.springframework.org/schema/beans http://www.springframework.org/schema/ beans/spring-beans-3.0.xsd        http://www.springframework.org/ schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/ Spring-tx-3.0.xsd        http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.0.xsd ">         <context:component-scan base-package= "com.baobaotao.conf"  /></beans>

The Test class.

Package Com.baobaotao.conf;import Org.junit.test;import Org.springframework.context.support.classpathxmlapplicationcontext;public class Configtest {@Test public void Test ( ) {Classpathxmlapplicationcontext AC = new Classpathxmlapplicationcontext ("Com/baobaotao/conf/bean        . xml ");        Logonservice Logonservice = Ac.getbean (Logonservice.class);    Logonservice.print (); }}

After the component scan, the class using the @configuration annotation has been assembled into an XML file, so you can use the application context to get the bean.

Introducing an XML configuration file through a configuration class

Package com.baobaotao.conf;import org.springframework.beans.factory.annotation.autowired;import  org.springframework.context.annotation.Bean;import  org.springframework.context.annotation.configuration;import  org.springframework.context.annotation.importresource;// Introduction of XML configuration file @configuration@importresource ("Classpath:com/baobaotao/conf/bean2.xml") via @importresourcce public  class logonappconfig {        //automatically injects the bean  defined in the XML file     @Bean      @Autowired     public logonservice  logonservice (Userdao userdao, logdao logdao) {         logonservice logonservice = new logonservice ();         logonservice.setuserdao (Userdao);         Logonservice.setlogdao (Logdao);         return logonservice;    }} 

Referenced XML configuration file

<?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"     xmlns:aop= "http// Www.springframework.org/schema/aop "    xmlns:tx=" Http://www.springframework.org/schema/tx "     xmlns:jdbc= "Http://www.springframework.org/schema/jdbc"     xmlns:p = "http://www.springframework.org/schema/p"     xmlns:util= "http://www.springframework.org/ Schema/util "    xsi:schemalocation=" http://www.springframework.org/schema/jdbc http:/ /www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd        http:/ /www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd         http://www.springframework.org/schema/beans http://www.springframework.org/schema/ beans/spring-beans-3.0.xsd        http://www.springframework.org/ schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/ Spring-tx-3.0.xsd        http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.0.xsd ">    < Bean id= "Userdao"  class= "Com.baobaotao.conf.UserDao"/>    <bean id= " Logdao " class=" Com.baobaotao.conf.LogDao "/></beans>

The Test class.

Package Com.baobaotao.conf;import Org.junit.test;import Org.springframework.context.support.classpathxmlapplicationcontext;public class Configtest {@Test public void Test ( ) {Classpathxmlapplicationcontext AC = new Classpathxmlapplicationcontext ("Com/baobaotao/conf/bean        . xml ");        Logonservice Logonservice = Ac.getbean (Logonservice.class);    Logonservice.print (); }}

Simplifying XML configuration with Java Config in spring