JAVA日志工具类
package com.ming.util; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; /** * 文本记录日志 * * @author Ming * @update 2016-11-30 17:13:00 (1,使用子线程写入文本日志;2,添加异常日志记录) * */ public class LogUtil { private static String log_path = getBasePath();// 日志保存路径 private static String log_name = "yxt_log";// 日志文件名(前部分) private static boolean console_out = true;// 日志是否输出到控制台 /* * yyyy-MM: 每个月更新一个log日志 yyyy-ww: 每个星期更新一个log日志 yyyy-MM-dd: 每天更新一个log日志 * yyyy-MM-dd-a: 每天的午夜和正午更新一个log日志 yyyy-MM-dd-HH: 每小时更新一个log日志 * yyyy-MM-dd-HH-mm: 每分钟更新一个log日志 */ private static String update_hz = "yyyy-MM";// 更新日志的频率,每月更新一次 private static long max_log_size = 1024 * 1024 * 10;// 单个日志文件最大大小 10M public static void debug(String msg) { runWrite(msg, log_path, log_name + "_debug"); } public static void info(String msg) { runWrite(msg, log_path, log_name + "_info"); } public static void error(String msg) { runWrite(msg, log_path, log_name + "_error"); } public static void exception(Exception e) { String errorMessage = e.getMessage() + ""; StackTraceElement[] eArray = e.getCause().getStackTrace(); for (int i = 0; i < eArray.length; i++) { String className = e.getCause().getStackTrace()[i].getClassName(); String MethodName = e.getCause().getStackTrace()[i].getMethodName(); int LineNumber = e.getCause().getStackTrace()[i].getLineNumber(); errorMessage = errorMessage + "\n\t---" + className + "." + MethodName + ",\tline:" + LineNumber; } logResult(errorMessage, log_path, log_name + "_exception"); } /** * 日志根目录 * * @return */ public static String getBasePath() { String s = Thread.currentThread().getContextClassLoader().getResource("").getPath(); s = s.substring(0, s.indexOf("WEB-INF")) + "log" + File.separator; return s; } /** * 写日志 * * @param sWord * 要写入日志里的文本内容 */ public static void logResult(String sWord) { runWrite(sWord, log_path, log_name); } public static void logResult(String sWord, String logPath, String logName) { FileWriter writer = null; try { File dir = new File(logPath); if (!dir.exists()) { dir.mkdirs(); } String dt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(new Date()); File f = new File(logPath + logName + "_" + new SimpleDateFormat(update_hz).format(new Date()) + ".txt"); if (!f.exists()) { f.createNewFile(); sWord = "AllMing 日志\r\n" + "[" + dt + "]\t" + sWord; } else { long logSize = f.length(); // 文件大小超过10M,备份 if (logSize >= max_log_size) { String backLogName = logPath + logName + new SimpleDateFormat("_yyyy-MM-dd.HHmmss.SSS").format(new Date()) + ".txt"; f.renameTo(new File(backLogName)); } } writer = new FileWriter(f, true); writer.write("[" + dt + "]\t" + sWord + "\r\n"); if (console_out) { System.out.println("[" + dt + "]\t" + sWord); } } catch (Exception e) { System.out.println("记录日志异常:" + e.toString()); e.printStackTrace(); } finally { if (writer != null) { try { writer.close(); } catch (IOException e) { e.printStackTrace(); } } } } public static void runWrite(final String sWord,final String logPath,final String logName) { new Thread() { public void run() { logResult(sWord, logPath, logName); } }.start();; } public static void main(String[] args) { for (int i = 0; i <1000; i++) { error(""+i); } } }