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