Java反射深度测试

Java反射深度测试 通过反射API构造对象，并使用反射调用方式访问对象的public/private方法和字段。 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

本文来自互联网用户投稿，文章观点仅代表作者本人，不代表本站立场，不承担相关法律责任。如若转载，请注明出处。 如若内容造成侵权/违法违规/事实不符，请点击【内容举报】进行投诉反馈！