使用通过接口定义，或解析接口注解等完成相关功能，如mybatis的SqlSession.getMapper的实现
1.接口定义
[java] view plain copy print ? package cn.proxy; public interface IHello { String say(String aa); } 2.代理实现
[java] view plain copy print ? package cn.proxy; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; /** * JDK动态代理代理类 * */ @SuppressWarnings("unchecked") public class FacadeProxy implements InvocationHandler { @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println("接口方法调用开始"); //执行方法 System.out.println("method toGenericString:"+method.toGenericString()); System.out.println("method name:"+method.getName()); System.out.println("method args:"+(String)args[0]); System.out.println("接口方法调用结束"); return "调用返回值"; } public static <T> T newMapperProxy(Class<T> mapperInterface) { ClassLoader classLoader = mapperInterface.getClassLoader(); Class<?>[] interfaces = new Class[]{mapperInterface}; FacadeProxy proxy = new FacadeProxy(); return (T) Proxy.newProxyInstance(classLoader, interfaces, proxy); } }
4.运行
[java] view plain copy print ? package cn.proxy; public class Test { public static void main(String[] args) { IHello hello = FacadeProxy.newMapperProxy(IHello.class); System.out.println(hello.say("hello world")); } } 运行结果：
[plain] view plain copy print ? 接口方法调用开始 method toGenericString:public abstract java.lang.String cn.proxy.IHello.say(java.lang.String) method name:say method args:hello world 接口方法调用结束 调用返回值
