JDK的動態代理是基于接口的

package ?com.open.aop;
 public ? interface ?BusinessInterface? {
???? public ? void ?processBusiness();
}
目標對象
package?com.open.aop;
public?class?BusinessObject?implements?BusinessInterface?{
????public?void?processBusiness()?{
????????System.out.println("action");
????}
}
代理對象
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("對象方法調用前");
????????try?{
????????????obj?=?method.invoke(delegate,?args);
????????}?catch?(Exception?e)?{
????????}
????????System.out.println("對象方法調用后");?
????????return?obj;
????}
}
測試類
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();
????}
}
輸出結果
對象方法調用前
action
對象方法調用后