12-Spring-AOP计数功能加日记功能-JDK实现完善

目标: 11-Spring-AOP-通过案例理解AOP这篇文章中是一个简单的实现JDK代理的功能,需要完善工具包(LogUtils)和代理操作(JDKProxyHandler).
掌握1: 日志工具类中日志的四个阶段(logBefore,logAfter,logThrowing,logAfterReturing)
掌握2: 代理操作实现日志记录的步骤

计数功能加日记功能优化代码

// logUtils.java(top.starrylsi.utils)
package top.starrylsi.utils;

import java.util.Arrays;

public class LogUtils {
    //1.执行前
    public static void logBefore(String method,Object ...params) {
        System.out.println("这是"+method+"方法"+"参数:"+Arrays.toString(params));
    }
    
    //2.执行完毕
    public static void logAfter(String method) {
        System.out.println("这是"+method+"方法"+"方法执行完毕");
    }
    
    //3.执行异常
    public static void logThrowing(String method,Exception e) {
        System.out.println("这是"+method+"方法抛出了异常 异常是:"+e.getMessage());
        
    }
    
    //4.返回结果
    public static void logAfterReturing(String method,Object result) {
        System.out.println("这是"+method+"方法: 结果是:"+result);
    }
}    

// JDKProxyHandler(top.starrylsi.proxy)
package top.starrylsi.proxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import top.starrylsi.caculate.Caculate;
import top.starrylsi.utils.LogUtils;

public class JDKProxyHandler implements InvocationHandler{
    private Caculate caculate;
    
    public JDKProxyHandler(Caculate caculate) {
        this.caculate = caculate;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        //1. 获取方法名
        String methodName = method.getName();
        
        //2. 调用日志
        LogUtils.logBefore(methodName, args);
        
        //3. 声明结果
        Object result =null;
        
        //4. 执行方法 并获取返回值
        try {
            result = method.invoke(caculate, args);
        } catch (Exception e) {
            //5. 出异常显示异常日志
            LogUtils.logThrowing(methodName, e);
        }finally {
            //6.执行日志完毕
            LogUtils.logAfter(methodName);
        }
        if(result != null) {
            LogUtils.logAfterReturing(methodName, result);
        }
        
        return null;
    }
}