编写Java动态代理的步骤如下：
1.创建一个实现接口InvocationHandler的类，它必须实现invoke方法
2.创建被代理的类以及接口
3.通过Proxy的静态方法 newProxyInstance(ClassLoader loader, Class[] interfaces, InvocationHandler h)
4.通过代理调用方法
Java代码 package test; public interface PeopleInfac { public void showInfo(); }package test; public interface PeopleInfac { public void showInfo(); }
Java代码 package test; public class People implements PeopleInfac { public void showInfo() { System.out.println("people showInfo()"); } }
package test; public class People implements PeopleInfac { public void showInfo() { System.out.println("people showInfo()"); } }
Java代码 package test; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; public class DanimacProxy implements InvocationHandler { Object o; public DanimacProxy(Object o) { this.o = o; } public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { method.invoke(o, null); return null; } }
package test; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; public class DanimacProxy implements InvocationHandler { Object o; public DanimacProxy(Object o) { this.o = o; } public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { method.invoke(o, null); return null; } }
Java代码 package test; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Proxy; public class Test { public static void main(String[] args) { People p = new People(); InvocationHandler proxy = new DanimacProxy(p); Class<?> cls = p.getClass(); PeopleInfac pi = (PeopleInfac) Proxy.newProxyInstance(cls .getClassLoader(), cls.getInterfaces(), proxy); pi.showInfo(); } }
