代理模式（Proxy）是通過代理對(duì)象訪問目標(biāo)對(duì)象，這樣可以在目標(biāo)對(duì)象基礎(chǔ)上增強(qiáng)額外的功能，如添加權(quán)限，訪問控制和審計(jì)等功能。

1.自定義業(yè)務(wù)接口

package com.haijiao12138.demo.spring.agentLog0815; /** * @author: haijiao12138 * @ClassName: BusinessClassService * @description: TODO * @date: 2021/8/15 14:33 */public interface BusinessClassService { public void doSomeThing();//自定義接口 }

2.自定義業(yè)務(wù)接口實(shí)現(xiàn)類

package com.haijiao12138.demo.spring.agentLog0815; /** * @author: haijiao12138 * @ClassName: BusinessClassServiceImpl * @description: 業(yè)務(wù)類 * @date: 2021/8/15 14:34 */public class BusinessClassServiceImpl implements BusinessClassService { //執(zhí)行某事 @Override public void doSomeThing() {System.out.println('doing somthing......'); }}

3.日志接口和實(shí)現(xiàn)類

package com.haijiao12138.demo.spring.agentLog0815; import java.lang.reflect.Method; /** * @author: haijiao12138 * @ClassName: MyLogger * @description:日志類接口 * @date: 2021/8/15 14:38 */public interface MyLogger { //記錄進(jìn)入方法時(shí)間 public void saveIntoMethodTime(Method method); //記錄退出方法的時(shí)間 public void saveOutMethodTime(Method method);}

package com.haijiao12138.demo.spring.agentLog0815; import java.lang.reflect.Method;import java.util.Date; /** * @author: haijiao12138 * @ClassName: MyLoggerImpl * @description: TODO 日志實(shí)現(xiàn)類 * @date: 2021/8/15 14:40 */public class MyLoggerImpl implements MyLogger{ @Override public void saveIntoMethodTime(Method method) {System.out.println('進(jìn)入' + method.getName() +'方法時(shí)間為: ' + new Date()); } @Override public void saveOutMethodTime(Method method) {System.out.println('退出' + method.getName() + '方法時(shí)間為：' + new Date()); }}

4.下面是日志類的handler實(shí)現(xiàn)：

package com.haijiao12138.demo.spring.agentLog0815; import java.lang.reflect.Method;import java.util.Date; /** * @author: haijiao12138 * @ClassName: MyLoggerImpl * @description: TODO 日志實(shí)現(xiàn)類 * @date: 2021/8/15 14:40 */public class MyLoggerImpl implements MyLogger{ @Override public void saveIntoMethodTime(Method method) {System.out.println('進(jìn)入' + method.getName() +'方法時(shí)間為: ' + new Date()); } @Override public void saveOutMethodTime(Method method) {System.out.println('退出' + method.getName() + '方法時(shí)間為：' + new Date()); }}

5.測(cè)試類

package com.haijiao12138.demo.spring.agentLog0815; import java.lang.reflect.Proxy; /** * @author: haijiao12138 * @ClassName: MyLoggerTest * @description: TODO 日志測(cè)試類 * @date: 2021/8/15 14:43 */public class MyLoggerTest { public static void main(String[] args) {/** 實(shí)例化真實(shí)項(xiàng)目中業(yè)務(wù)類 **/BusinessClassService businessClassService = new BusinessClassServiceImpl();/** 日志類的handler **/MyLoggerHandler myLoggerHandler = new MyLoggerHandler(businessClassService);/** 獲得代理類對(duì)象 **/BusinessClassService businessClass = (BusinessClassService) Proxy.newProxyInstance(businessClassService.getClass().getClassLoader(), businessClassService.getClass().getInterfaces(),myLoggerHandler);/** 執(zhí)行代理類方法 **/businessClass.doSomeThing(); } }

結(jié)果輸出：

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