JavaEE互联网轻量级框架整合开发（书籍）阅读笔记（11）：XML和Annotation装配Bean的混合使用（@ImportResource）

2023-08-21 08:07:10

一、XML和Annotation装配Bean如何合理使用

　　引入第三方资源包中类的时候，建议使用XML配置，而使用自己编写的Java类的时候，推荐使用Annotation注解配置Bean。

二、关于注解@ImportResource的小例子

创建一个POJO类：UserBean.java

 package com.xfwl.spring.annotation.xmlImport;

 import org.springframework.beans.factory.annotation.Value;

 import org.springframework.context.annotation.ComponentScan;

 import org.springframework.stereotype.Component;

 /**

  * 测试注解：@Component装配Bean

  * @author Jason

  *

  */

 //@Component("user")    //注入user  //@Component("user")或者@Component(value="user")

 public class UserBean {

     private String uname;

     private String upwd;

     public UserBean(){}

     public UserBean(String uname,String upwd){

         this.uname=uname;

         this.upwd=upwd;

     }

     public String getUname() {

         return uname;

     }

     public void setUname(String uname) {

         this.uname = uname;

     }

     public String getUpwd() {

         return upwd;

     }

     public void setUpwd(String upwd) {

         this.upwd = upwd;

     }

     @Override

     public String toString() {

         return "UserBean [uname=" + uname + ", upwd=" + upwd + "]";

     }

     /**Bean生命周期测试**/

     public void init(){

         System.out.println("【"+this.getClass().getSimpleName()+"】执行自定义初始化方法！");

     }

     public void mydestory(){

         System.out.println("【"+this.getClass().getSimpleName()+"】执行自定义销毁法！");

     }

 }

创建一个xml配置文件：bean.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-2.0.xsd">

     <!-- 依赖注入：bean -->

     <bean id="user" class="com.xfwl.spring.annotation.xmlImport.UserBean">

         <property name="uname" value="xfww"/>

         <property name="upwd"  value="123456"/>

     </bean>

 </beans>

再创建一个xml配置文件：bean2.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-2.0.xsd">

    <!-- 依赖注入：bean -->

    <bean id="user2" class="com.xfwl.spring.annotation.xmlImport.UserBean">

        <property name="uname" value="xfww"/>

        <property name="upwd"  value="123456"/>

    </bean>

</beans>

创建一个管理类：ManagerScan.java

 package com.xfwl.spring.annotation.xmlImport;

 import org.springframework.beans.factory.BeanNameAware;

 import org.springframework.beans.factory.DisposableBean;

 import org.springframework.beans.factory.InitializingBean;

 import org.springframework.beans.factory.annotation.Autowired;

 import org.springframework.context.annotation.Bean;

 import org.springframework.context.annotation.ComponentScan;

 import org.springframework.context.annotation.Configuration;

 import org.springframework.context.annotation.ImportResource;

 @Configuration
@ImportResource({"classpath:com/xfwl/spring/annotation/xmlImport/bean.xml",
                  "classpath:com/xfwl/spring/annotation/xmlImport/bean2.xml"})//相对路径，@ImportResource注解中的配置项支持字符串数组

 @ComponentScan(basePackages={"com.xfwl.spring.annotation.bean"})            //配置扫描包

 public class ManagerScan{

     @Bean(name={"tom","jack"},initMethod="init",destroyMethod="mydestory")

     public UserBean getUser(@Autowired UserBean user2){//此处使用user或者user2，经过测试都可以

         return user2;

     }

 }

创建一个测试类：TestBean.java

 package com.xfwl.spring.annotation.xmlImport;

 import java.util.Properties;

 import javax.sql.DataSource;

 import org.apache.commons.dbcp2.BasicDataSourceFactory;

 import org.springframework.context.ApplicationContext;

 import org.springframework.context.annotation.AnnotationConfigApplicationContext;

 import org.springframework.context.annotation.Bean;

 import org.springframework.context.annotation.ComponentScan;

 import org.springframework.stereotype.Component;

 @Component("test")

 public class TestBean {

     public static void main(String[] args) {

         //通过注解获取IoC容器对象

         AnnotationConfigApplicationContext ctx=new  AnnotationConfigApplicationContext(ManagerScan.class);

         UserBean user=(UserBean) ctx.getBean("jack");

         System.out.println(user.toString());

         ctx.close();

     }

 }

测试结果：

 log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).

 log4j:WARN Please initialize the log4j system properly.

 log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

 【UserBean】执行自定义初始化方法！

 UserBean [uname=xfww, upwd=123456]

 【UserBean】执行自定义销毁法！

码农公寓

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