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！