使用BeanWrapper管理Bean

使用BeanWrapper管理Bean
1.修改Bean,增加一个无参数的构造函数
2.配置文件基本不需要改变
3.修改测试代码

Bean如下所示：

    package com.gc.action;  
      
    import java.util.Date;  
      
    public class HelloWorld   
    //implements InitializingBean,DisposableBean  
    {  
      
        private String msg=null;//该变量用来存储字符串  
        private Date date=null;//该变量用来存储日期  
          
        public HelloWorld(){  
              
        }  
          
          
        //设定变量msg的set方法  
        public void setMsg(String msg) {  
            this.msg=msg;  
        }  
          
        //获取变量msg的get方法  
        public String getMsg() {  
            return this.msg;  
        }        
        public Date getDate() {  
            return this.date;  
        }        
        public void setDate(Date date) {  
            this.date = date;  
        }   
    }  

 配置文件：

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"  
"http://www.springframework.org/dtd/spring-beans.dtd">  
<beans>  
    <!--定义一个Bean-->  
    <bean id="HelloWorld" class="com.gc.action.HelloWorld" init-method="afterPropertiesSet" destroy-method="cleanup">  
    <!--将其变量msg通过依赖注入-->   
      
    </bean>   
</beans> 

 测试程序：

 

    package com.gc.test;  
      
    import java.util.Date;  
      
    import org.springframework.beans.BeanWrapper;  
    import org.springframework.beans.BeanWrapperImpl;  
    import org.springframework.context.ApplicationContext;  
    import org.springframework.context.support.AbstractApplicationContext;  
    import org.springframework.context.support.ClassPathXmlApplicationContext;  
    import org.springframework.context.support.FileSystemXmlApplicationContext;  
      
    import com.gc.action.HelloWorld;  
      
      
    public class TestHelloWorld {  
        public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException  
        {  
            //通过Class.forName()方法获取类HelloWorld的一个实例  
            Object obj=Class.forName("com.gc.action.HelloWorld").newInstance();  
              
            //通过BeanWrapper来设定类HelloWorld的属性  
            BeanWrapper bw=new BeanWrapperImpl(obj);  
              
            //根据类变量设定变量的值  
            bw.setPropertyValue("msg","HelloWorld");  
            bw.setPropertyValue("date",new Date());  
              
              
            System.out.println(bw.getPropertyValue("date")+" "+bw.getPropertyValue("msg")+"------");  
        }  
    }  

 

输出：

Tue Mar 20 19:29:35 CST 2012 HelloWorld------