写日志文件的代码

来源：互联网发布：网易大数据平台编辑：程序博客网时间：2024/06/02 23:44
直接上代码：
package com.inspur.log;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.PrintWriter;import java.util.Calendar;public class WriteLog { private static WriteLog instance = null; private WriteLog(){}; public static WriteLog getInstance() {        if( instance == null ) {            instance = new WriteLog();        }        return instance;    } public void logger(String fileNameHead,String logString) {   try {    String logFilePathName=null;    Calendar cd = Calendar.getInstance();//日志文件时间    int year=cd.get(Calendar.YEAR);    String month=addZero(cd.get(Calendar.MONTH)+1);    String day=addZero(cd.get(Calendar.DAY_OF_MONTH));    String hour=addZero(cd.get(Calendar.HOUR_OF_DAY));    String min=addZero(cd.get(Calendar.MINUTE));    String sec=addZero(cd.get(Calendar.SECOND));          File fileParentDir=new File("./log");<span style="font-family: Arial, Helvetica, sans-serif;">//判断log目录是否存在</span>    if (!fileParentDir.exists()) {     fileParentDir.mkdir();    }    if (fileNameHead==null||fileNameHead.equals("")) {     logFilePathName="./log/"+year+month+day+hour+".log";//日志文件名    }else {     logFilePathName="./log/"+fileNameHead+year+month+day+hour+".log";//日志文件名    }       PrintWriter printWriter=new PrintWriter(new FileOutputStream(logFilePathName, true));    String time="["+year+month+day+"-"+hour+":"+min+":"+sec+"] ";    printWriter.println(time+logString);    printWriter.flush();      } catch (FileNotFoundException e) {    // TODO Auto-generated catch block    e.getMessage();   }} /**整数小于10前面补0* @param i* @return*/public static String addZero(int i) {   if (i<10) {    String tmpString="0"+i;    return tmpString;   }   else {    return String.valueOf(i);   }  }public static void main(String[] args) {// TODO Auto-generated method stubWriteLog log = null;log.getInstance().logger("test", "hello world, t02,test");}}
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