Bean注入方式2：使用构造器装配属性

步骤:

(1)改写 PersionServiceBean.java ,为注入的属性加上构造方法
Java代码

package cn.com.xinli.service.impl; 

import org.apache.log4j.Logger; 

import cn.com.xinli.dao.PersionDao; 
import cn.com.xinli.service.PersionSevice; 

public class PersionServiceBean implements PersionSevice 
{ 
 Logger log=Logger.getLogger(PersionServiceBean.class); 
 <span style="color: #ff0000;">private PersionDao persionDao; 
 private String name; 

 public PersionServiceBean(PersionDao persionDao, String name) { 

 this.persionDao = persionDao; 
 this.name = name; 
 }</span> 
 public String getName() 
 { 
 return name; 
 } 
 public void setName(String name) 
 { 
 this.name = name; 
 } 
 public PersionDao getPersionDao() 
 { 
 return persionDao; 
 } 
 public void setPersionDao(PersionDao persionDao) 
 { 
 this.persionDao = persionDao; 
 } 
 public void init() 
 { 
 log.info("初始化资源"); 
 } 
 public PersionServiceBean() 
 { 
 log.info("我被实例化了"); 
 } 

 public void save() 
 { 
 log.info("name:"+name); 

 this.persionDao.add(); 
 } 
 public void destory() 
 { 
 log.info("释放资源"); 
 } 

} 

 
(2) 配置beans.xml,其中配置了一个依赖属性和一个基本的String类型


Xml代码

<bean id="persionServiceBean" class="cn.com.xinli.service.impl.PersionServiceBean" init-method="init" destroy-method="destory"> 

 <constructor-arg index="0" type="cn.com.xinli.dao.PersionDao" ref="persionDao"></constructor-arg> 
 <constructor-arg index="1" value="huxl"></constructor-arg> 
  </bean> 

 

(3) 测试:

Java代码

ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); 
 PersionSevice ps=(PersionSevice)ctx.getBean("persionServiceBean"); 
 ps.save(); 

 
结果:

INFO (PersionServiceBean.java:37) - 初始化资源
INFO (PersionServiceBean.java:46) - name:huxl
INFO (PersionDaoBean.java:15) - 执行了PersionDaoBean中的add()方法