package lavasoft.test; 

/** 

* 测试的业务类 

* 

* @author leizhimin 2010-5-6 20:16:10 

*/ 
public  class MyService { 
         private String msg; 

         public MyService() { 
                System.out.println( "log: 无参构造方法lavasoft.test.MyService.MyService()被调用过了！"); 
        } 

         public MyService(String msg) { 
                System.out.println( "log: 有参构造方法lavasoft.test.MyService.MyService()被调用过了！"); 
                 this.msg = msg; 
        } 

         public String doSomething(String person, String something) { 
                System.out.println( "log: 业务方法lavasoft.test.MyService.doSomething()被调用过了！"); 
                 return person +  " is doing " + something +  "!    " + 
                                 "附加消息：" + msg; 
        } 

         public String getMsg() { 
                System.out.println( "log: lavasoft.test.MyService.getMsg()被调用过了！"); 
                 return msg; 
        } 

         public  void setMsg(String msg) { 
                System.out.println( "log: lavasoft.test.MyService.setMsg()被调用过了！"); 
                 this.msg = msg; 
        } 

         private String doPrivate() { 
                System.out.println( "log: 私有方法lavasoft.test.MyService.doPrivate()被调用过了！"); 
                 return  "私有方法doPrivate()被调用了!"; 
        } 
}

package lavasoft.test; 

import java.lang.reflect.Constructor; 
import java.lang.reflect.InvocationTargetException; 
import java.lang.reflect.*; 

/** 

* Java反射深度测试 

* 

* @author leizhimin 2010-5-6 20:26:49 

*/ 
public  class TestReflect { 
         public  static  void main(String[] args)  throws NoSuchMethodException, InvocationTargetException, IllegalAccessException, InstantiationException, NoSuchFieldException { 
                 //通过反射方式创建对象 
                Class clazz = MyService. class; 
                MyService sv = (MyService)clazz.getConstructor().newInstance(); 
                sv.setMsg( "通过Class方式创建一个对象，并调用对象上的方法！"); 

                 //通过反射方式调用对象的public方法 
                Method m_setMsg =    clazz.getMethod( "setMsg",String. class); 
                m_setMsg.invoke(sv, "通过反射调用了sv对象上的一个方法！"); 
                Method m_do    = clazz.getMethod( "doSomething",String. class ,String. class); 
                String re = (String)m_do.invoke(sv, "张三" , "吃饭"); 
                System.out.println(re); 

                 //通过反射方式调用对象的private方法 
                Method m_doPrivate = clazz.getDeclaredMethod( "doPrivate"); 
                m_doPrivate.setAccessible( true); 
                m_doPrivate.invoke(sv); 

                 //通过反射方式访问对象private字段 
                Field f_msg = clazz.getDeclaredField( "msg"); 
                f_msg.setAccessible( true); 
                f_msg.set(sv, "hahahahahahahaha"); 
                System.out.println(sv.getMsg()); 
        } 
}

log: 无参构造方法lavasoft.test.MyService.MyService()被调用过了！ 
log: lavasoft.test.MyService.setMsg()被调用过了！ 
log: lavasoft.test.MyService.setMsg()被调用过了！ 
log: 业务方法lavasoft.test.MyService.doSomething()被调用过了！ 
张三 is doing 吃饭!    附加消息：通过反射调用了sv对象上的一个方法！ 
log: 私有方法lavasoft.test.MyService.doPrivate()被调用过了！ 
log: lavasoft.test.MyService.getMsg()被调用过了！ 
hahahahahahahaha 

Process finished with exit code 0