興趣來了想實現一個異常日誌記錄，將某些方法呼叫錯誤資訊儲存。然後程式繼續丟擲異常，單純記錄流水。
下面簡單記錄使用aop實現，上程式碼吧

記得配置
<!-- 開啟spring aop -->
<aop:aspectj-autoproxy/>

package com.xyw.annotation;

import java.lang.annotation.*;

/**
 * Created by xuyw on 2016/8/19.
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
 

public @interface PrintLog {
    String msg();
}

package com.xyw.web.aop;

import com.alibaba.fastjson.JSON;
import com.xyw.annotation.PrintLog;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework
 
.stereotype.Component;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

/**
 * Created by xuyw on 2016/8/16.
 */
@Aspect
@Component
public class AopUtil {
    @Around("execution( public * com.xyw.service.*.impl.*.*(..)) && @annotation(log)")
    public Object arount(ProceedingJoinPoint pj, PrintLog log) throws Throwable {
        try {
            return pj.proceed
 
();
        } catch (Throwable e) {
            Object[] param = pj.getArgs();//引數
            printLog(e, param, log);
            throw e;
        }
    }

    private void printLog(Throwable e, Object[] param, PrintLog log) {
        try {
            System.err.println("執行:\n" + log.msg());
            System.err.println("param:\n" + JSON.toJSONString(param));
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            PrintStream stream = new PrintStream(out);
            e.printStackTrace(stream);
            stream.close();
            out.close();
            System.err.println("發生異常:\n" + new String(out.toByteArray(), "UTF-8"));
        } catch (Exception e1) {
            e1.printStackTrace();
        }
    }
}

測試故意丟擲異常
 @Override
    @PrintLog(msg="測試aop")
    public void testAop() {
        int i=1/0;
    }