aspectコード

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect
public class MethodLogger {
    
    private static final String LOG_FILE_NAME = "method.log";
    
    private static PrintWriter writer;
    
    static {
        try {
            writer = new PrintWriter(new BufferedWriter(new FileWriter(LOG_FILE_NAME)));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    private static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    
    @Before("execution(* *(..))")
    public void logMethodStart(JoinPoint joinPoint) {
        String methodName = joinPoint.getSignature().getName();
        String className = joinPoint.getTarget().getClass().getName();
        String timeStamp = dateFormat.format(new Date());
        String logMessage = String.format("[%s] %s.%s() 開始", timeStamp, className, methodName);
        writer.println(logMessage);
        writer.flush();
    }
    
    @After("execution(* *(..))")
    public void logMethodEnd(JoinPoint joinPoint) {
        String methodName = joinPoint.getSignature().getName();
        String className = joinPoint.getTarget().getClass().getName();
        String timeStamp = dateFormat.format(new Date());
        String logMessage = String.format("[%s] %s.%s() 終了", timeStamp, className, methodName);
        writer.println(logMessage);
        writer.flush();
    }
    
}