最简单的动态代理实例(spring基于接口代理的AOP原理)
JDK的动态代理是基于接口的
package com.open.aop;
public interface BusinessInterface {
public void processBusiness();
}
目标对象
package com.open.aop;
public class BusinessObject implements BusinessInterface {
public void processBusiness() {
System.out.println("action");
}
}
代理对象
package com.open.aop;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
public class LogHandler implements InvocationHandler {
private Object delegate;
public Object binder(Object delegate) {
this.delegate=delegate;
return Proxy.newProxyInstance(delegate.getClass().getClassLoader(),
delegate.getClass().getInterfaces(),this);
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
Object obj = null;
System.out.println("对象方法调用前");
try {
obj = method.invoke(delegate, args);
} catch (Exception e) {
}
System.out.println("对象方法调用后");
return obj;
}
}
测试类
package com.open.aop;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
public class Test {
public static void main(String[] args) {
BusinessInterface bi = (BusinessInterface) new LogHandler()
.binder(new BusinessObject());
bi.processBusiness();
}
}
输出结果 ：
对象方法调用前
action
对象方法调用后
