Java dynamic proxy class implements simple example of log
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How does the Java dynamic proxy class implement simple logging? ? ?
Brief book address: http://www.jianshu.com/users/d38a3668be58/latest_articles
Solution to the problem
If you already have a certain java foundation
If you already know what a dynamic proxy is.
1. If the following is the real business class and its implementation class
[code]package com.hwy.test;
/**
* Created by Ay on 2016/7/1.
*/
public interface BusinessClassService {
public void doSomeThing();
}
Implementation class:
[code]package com.hwy.test;
/**
* 业务类
* Created by Ay on 2016/7/1.
*/
public class BusinessClassServiceImpl implements BusinessClassService{
/** 执行某事 **/
public void doSomeThing(){
System.out.println("do something ......");
}
}2.The following is the log class and implementation class:
[code]package com.hwy.test;
import java.lang.reflect.Method;
/**
* 日志类接口
* Created by Ay on 2016/6/30.
*/
public interface MyLogger {
/** 纪录进入方法时间 **/
public void saveIntoMethodTime(Method method);
/** 纪录退出方法时间**/
public void saveOutMethodTime(Method method);
}Implementation class:
[code]package com.hwy.test;
import java.lang.reflect.Method;
/**
* 日志类实现
* Created by Ay on 2016/6/30.
*/
public class MyLoggerImpl implements MyLogger {
@Override
public void saveIntoMethodTime(Method method) {
System.out.println("进入" + method.getName() +"方法时间为: " + System.currentTimeMillis());
}
@Override
public void saveOutMethodTime(Method method) {
System.out.println("退出" + method.getName() + "方法时间为：" + System.currentTimeMillis());
}
}3. The following is the handler implementation of the log class:
[code]package com.hwy.test;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
/**
* Created by Ay on 2016/6/30.
*/
public class MyLoggerHandler implements InvocationHandler {
/** 原始对象 **/
private Object objOriginal;
/** 这里很关键 **/
private MyLogger myLogger = new MyLoggerImpl();
public MyLoggerHandler(Object obj){
super();
this.objOriginal = obj;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Object result = null;
/** 日志类的方法 **/
myLogger.saveIntoMethodTime(method);
/** 调用代理类方法 **/
result = method.invoke(this.objOriginal ,args);
/** 日志类方法**/
myLogger.saveOutMethodTime(method);
return result;
}
}4. Finally, the test class:
[code]package com.hwy.test;
import java.lang.reflect.Proxy;
/**
* Created by A on 2016/6/30.
*/
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();
}
}5. Run MyLoggerTest class
[code]进入doSomeThing方法时间为: 1467326179684 do something ...... 退出doSomeThing方法时间为：1467326179685
6. A few words:
[code]1)上面类中，类的初始化，基本可以利用spring配置到配置文件中 2)上面只是一个简单的例子而已
Use a picture to roughly express:
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