代理模式动态代理

1. 接口

public interface PersonBean {
  String getName();
  int getAge();

  void setName(String name);
  void setAge(int age);

}

2.实现接口

public class PersonImpl implements PersonBean{
    String name;
    int age;
    public PersonImpl(String name,int age) {
        // TODO Auto-generated constructor stub
        this.name=name;
        this.age=age;
    }

    @Override
    public String getName() {
        // TODO Auto-generated method stub
        return name;
    }

    @Override
    public int getAge() {
        // TODO Auto-generated method stub

        return age;
    }

    @Override
    public void setName(String name) {
        // TODO Auto-generated method stub
        this.name=name;
    }

    @Override
    public void setAge(int age) {
        // TODO Auto-generated method stub
        this.age=age;
    }


}

3.实现InvocationHandler

public class OwnInvocationHander implements InvocationHandler {
     PersonBean per;
     public OwnInvocationHander(PersonBean per) {
        // TODO Auto-generated constructor stub
         this.per=per;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        // TODO Auto-generated method stub
        //控制方法调用
        try {

            if (method.getName().startsWith("get")) {
                System.out.println("success");
                return method.invoke(per, args);
            }else if (method.getName().startsWith("set")) {
                return method.invoke(per, args);
            }
        } catch (Exception e) {
            // TODO: handle exception
        }
        return null;
    }

}

4.创建动态代理类

public class CreateProxy {
  public  static PersonBean getPersonBean(PersonBean per) {
    return (PersonBean) Proxy.newProxyInstance(
            per.getClass().getClassLoader(), 
            per.getClass().getInterfaces(),
            new OwnInvocationHander(per));
}

}

5.测试类

public class TestProxy {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        PersonBean per=new PersonImpl("lei", 20);
        PersonBean ownser=CreateProxy.getPersonBean(per);
        ownser.setAge(22);
        System.out.println(ownser.getAge());

    }

}