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）

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！