自己写的简易版Java日志类分享

 /** * */ import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; /** * @author magic282 * */ public class Logger { private static String logFilePath; private static boolean isInitialized = false; private static FileWriter logWriter = null; private static boolean printLogWhenLog = true; private static boolean InitLogger() { String logDirectoryPath = System.getProperty("user.dir") + java.io.File.separatorChar + "log"; if (!new File(logDirectoryPath).exists()) { new File(logDirectoryPath).mkdir(); } Date logfileDate = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd-HH-mm-ss"); logFilePath = logDirectoryPath + java.io.File.separatorChar + dateFormat.format(logfileDate) + ".log"; try { logWriter = new FileWriter(logFilePath, true); isInitialized = true; } catch (IOException e) { // TODO Auto-generated catch block System.err.println("Unable to create log file."); System.err.println("Initilization fail."); e.printStackTrace(); return false; } return true; } public static void Log(String message) { if (!isInitialized) { InitLogger(); } Date logfileDate = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd-HH-mm-ss"); String callingClassName = new Exception().getStackTrace()[1] .getClassName(); synchronized (logWriter) { String log = String.format("[%s] @ [%s]: %s\n", callingClassName, dateFormat.format(logfileDate), message); if (printLogWhenLog) { System.out.printf("[log]:%s", log); } try { logWriter.write(log); logWriter.flush(); } catch (IOException e) { // TODO Auto-generated catch block System.err.println("Write log to file %s error."); e.printStackTrace(); } } } public static void Log(Exception exception) { if (!isInitialized) { InitLogger(); } Date logfileDate = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd-HH-mm-ss"); String callingClassName = new Exception().getStackTrace()[1] .getClassName(); synchronized (logWriter) { String log = String.format("[%s] @ [%s]: %s\n", callingClassName, dateFormat.format(logfileDate), exception.toString()); if (printLogWhenLog) { System.out.printf("[log]:%s", log); } try { logWriter.write(log); logWriter.flush(); } catch (IOException e) { // TODO Auto-generated catch block System.err.println("Write log to file %s error."); e.printStackTrace(); } } } }