Spring动态代理实现日志功能详解

代理模式（Proxy）是通过代理对象访问目标对象，这样可以在目标对象基础上增强额外的功能，如添加权限，访问控制和审计等功能。

1.自定义业务接口

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

2.自定义业务接口实现类

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

3.日志接口和实现类

package com.haijiao12138.demo.spring.agentLog0815; import java.lang.reflect.Method; /** * @author: haijiao12138 * @ClassName: MyLogger * @description:日志类接口 * @date: 2021/8/15 14:38 */public interface MyLogger { //记录进入方法时间 public void saveIntoMethodTime(Method method); //记录退出方法的时间 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 日志实现类 * @date: 2021/8/15 14:40 */public class MyLoggerImpl implements MyLogger{ @Override public void saveIntoMethodTime(Method method) {System.out.println('进入' + method.getName() +'方法时间为: ' + new Date()); } @Override public void saveOutMethodTime(Method method) {System.out.println('退出' + method.getName() + '方法时间为：' + new Date()); }}

4.下面是日志类的handler实现：

package com.haijiao12138.demo.spring.agentLog0815; import java.lang.reflect.Method;import java.util.Date; /** * @author: haijiao12138 * @ClassName: MyLoggerImpl * @description: TODO 日志实现类 * @date: 2021/8/15 14:40 */public class MyLoggerImpl implements MyLogger{ @Override public void saveIntoMethodTime(Method method) {System.out.println('进入' + method.getName() +'方法时间为: ' + new Date()); } @Override public void saveOutMethodTime(Method method) {System.out.println('退出' + method.getName() + '方法时间为：' + new Date()); }}

5.测试类

package com.haijiao12138.demo.spring.agentLog0815; import java.lang.reflect.Proxy; /** * @author: haijiao12138 * @ClassName: MyLoggerTest * @description: TODO 日志测试类 * @date: 2021/8/15 14:43 */public class MyLoggerTest { public static void main(String[] args) {/** 实例化真实项目中业务类 **/BusinessClassService businessClassService = new BusinessClassServiceImpl();/** 日志类的handler **/MyLoggerHandler myLoggerHandler = new MyLoggerHandler(businessClassService);/** 获得代理类对象 **/BusinessClassService businessClass = (BusinessClassService) Proxy.newProxyInstance(businessClassService.getClass().getClassLoader(), businessClassService.getClass().getInterfaces(),myLoggerHandler);/** 执行代理类方法 **/businessClass.doSomeThing(); } }

结果输出：

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