AOP统一日志打印处理

package com.xinyartech.erp.system.aop;

import java.lang.reflect.Modifier;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

import com.alibaba.fastjson.JSON;
import com.xinyartech.erp.core.util.Util;

import javassist.ClassClassPath;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtMethod;
import javassist.NotFoundException;
import javassist.bytecode.CodeAttribute;
import javassist.bytecode.LocalVariableAttribute;
import javassist.bytecode.MethodInfo;

/**
 * 通过spring aop实现service方法执行时间监控
 * 
 * @author Lynch
 *
 */
@Aspect
@Component
public class WebLogAop {
    private static org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(WebLogAop.class);
    
    private static ThreadLocal<String> threadLocal = new ThreadLocal<String>();
    
    //public static final String POINT = "execution (* com.xinyartech.erp.*.web.*.*(..))";

    @Pointcut("(execution (* com.xinyartech.erp.*.web.*.*(..)))")
    public void webLog(){
        
    }
    
    /**
     * 前置通知
     * @param joinPoint 切点
     * @throws Throwable 异常
     */
    @Before("webLog()")
    public void doBefore(JoinPoint joinPoint) throws Throwable {
        String uuid = Util.getUUID();
        threadLocal.set(uuid);
        
        String classType = joinPoint.getTarget().getClass().getName();
        Class<?> clazz = Class.forName(classType);
        String clazzName = clazz.getName();
        log.info(String.format("[%s] 类名：%s", uuid, clazzName));
        String methodName = joinPoint.getSignature().getName();
        log.info(String.format("[%s] 方法名：%s", uuid, methodName));
        String[] paramNames = getFieldsName(this.getClass(), clazzName, methodName);
        Object[] args = joinPoint.getArgs();
        for(int k=0; k<args.length; k++){
            log.info("[" + uuid + "] 参数名：" + paramNames[k] + "，参数值：" + JSON.toJSONString(args[k]));
        }
    }
    
    /**
     * 后置通知
     * 打印返回值日志
     * @param ret 返回值
     * @throws Throwable 异常
     */
    @AfterReturning(returning = "ret", pointcut = "webLog()")
    public void doAfterReturning(JoinPoint joinPoint, Object ret) throws Throwable {
        String uuid = threadLocal.get();
        String classType = joinPoint.getTarget().getClass().getName();
        Class<?> clazz = Class.forName(classType);
        String clazzName = clazz.getName();
        log.info(String.format("[%s] 类名：%s", uuid, clazzName));
        String methodName = joinPoint.getSignature().getName();
        log.info(String.format("[%s] 方法名：%s", uuid, methodName));
        log.info(String.format("[%s] 返回值 : %s", uuid, JSON.toJSONString(ret)));
        log.info("*****************************************");
    }
    
    /**
     * 得到方法参数的名称
     * @param cls 类
     * @param clazzName 类名
     * @param methodName 方法名
     * @return 参数名数组
     * @throws NotFoundException 异常
     */
    private static String[] getFieldsName(Class<?> cls, String clazzName, String methodName) throws NotFoundException {
        ClassPool pool = ClassPool.getDefault();
        ClassClassPath classPath = new ClassClassPath(cls);
        pool.insertClassPath(classPath);

        CtClass cc = pool.get(clazzName);
        CtMethod cm = cc.getDeclaredMethod(methodName);
        MethodInfo methodInfo = cm.getMethodInfo();
        CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
        LocalVariableAttribute attr = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);
        String[] paramNames = new String[cm.getParameterTypes().length];
        int pos = Modifier.isStatic(cm.getModifiers()) ? 0 : 1;
        for (int i = 0; i < paramNames.length; i++){
            paramNames[i] = attr.variableName(i + pos); //paramNames即参数名
        }
        return paramNames;
    }
}