【闲着没事儿干】JDK动态代理

package com.luxs.spring.dynamicProxy;

import com.luxs.bean.Teacher;

public interface Subject {
public void request();
public void request(String name);
public void request(Teacher teacher);
}

package com.luxs.spring.dynamicProxy;

import com.luxs.bean.Teacher;

public class RealSubject implements Subject{

public RealSubject() {
}

public void request(String name) {
System.out.println(String.format("我%s特么才是干活的！", name));
}

public void request() {
System.out.println("我特么才是干活的！");
}

public void request(Teacher teacher) {
System.out.println("Teacher 我特么才是干活的！");
}

}

package com.luxs.spring.dynamicProxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class DynamicSubject implements InvocationHandler { //必须实现这个接口
private Object sub;

public DynamicSubject(Object obj)
{
this.sub = obj;
}

// 代理类执行
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {

// 调用前
System.out.println(String.format("Befor Excute !", ""));

// 输出参数
if (args != null) {
for (Object obj : args) {
System.out.println(obj.getClass());
}
}

// 调用本体类执行
method.invoke(sub, args);

// 调用后
System.out.println("After Excute !");

return null;
}

}

package com.luxs.spring.dynamicProxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

import com.luxs.bean.Teacher;

public class Client {
public static void main(String[] args) {
// 真正运行的对象
Subject realSubject = new RealSubject();
// 调用捕捉（反射机制）
InvocationHandler dySub = new DynamicSubject(realSubject);
// 得到真正运行对象的类
Class<?> cls = realSubject.getClass();
// 生成代理对象（工厂模式）
Subject subject = (Subject) Proxy.newProxyInstance(cls.getClassLoader(), cls.getInterfaces(), dySub);
// 方法调用（->InvocationHandler里的方法）
subject.request();
subject.request("鲁小帅");
Teacher t = new Teacher();
t.setAddr("美国加州");
t.setId(1);
t.setName("鲁小帅");
subject.request(t);
}
}