使用java实现日志工具类分享

package com.teligen.eos.telecode;

import java.io.file;
import java.io.filewriter;
import java.io.ioexception;
import java.util.date;

/**
 * 书写日志信息到指定的文件中
 */
public class writelogutil {

 private static string rootpath = "d:\\logs\\";

 /**
  * 将信息写到文件中
  * @param msg
  */
 public static void writemsgtofile(string msg) {
  //删除之前的文件
  deloldfile();

  filewriter filewriter = null;
  try {
   filewriter = new filewriter(getfilename(),true);
   date today = new date();
   string time = string.valueof(today.gethours()) + ":" + string.valueof(today.getminutes()) + " " + string.valueof(today.getseconds());
   filewriter.write("#" + time + "# [" + msg + "]" + "\r\n");
   filewriter.flush();
  } catch (ioexception e) {
   system.out.println("### 写日志到文件异常 ### >>> " + e.getmessage());
   e.printstacktrace();
  } finally {
   try {
    filewriter.close();
   } catch (ioexception e) {
    system.out.println("### 关闭写日志的流异常 ### >>> " + e.getmessage());
    e.printstacktrace();
   }
  }
 }

 /**
  * 删除之前的日志文件
  */
 private static void deloldfile() {
  date today = new date();
  int month = today.getmonth()+1;
  month = month - 2;
  if(month == -1) month = 11;
  if(month == 0) month = 12;
  string delpath = rootpath + string.valueof(month) + "\\";
  file folder = new file(delpath);
  if(folder.exists()) {
   file[] files = folder.listfiles();
   for(int i=0; i<files.length; i++) {
    files[i].delete();
   }
  }
 }

 /**
  * 获取要保存的文件
  * @return filename
  */
 private static string getfilename() {
  date today = new date();
  string filename = string.valueof((today.getyear()+1900)) + string.valueof((today.getmonth()+1)) + string.valueof(today.getdate()) + ".log";

  
  //创建目录
  file folder = new file(rootpath + string.valueof((today.getmonth()+1)) + "\\");
  if(!folder.exists()) {
   folder.mkdirs();
  }
  //创建文件
  file file = new file(filename);
  if(!file.exists()) {
   try {
    file.createnewfile();
   } catch (ioexception e) {
    system.out.println("### 新建日志文件异常 ### >>> " + e.getmessage());
    e.printstacktrace();
   }
  }

  filename = rootpath + string.valueof((today.getmonth()+1)) + "\\" + filename;

  return filename;
 }

 /**
  * 测试使用的main方法
  */
 public static void main(string[] args) {
  //getfilename();
  string teststring = "写日志咯：71fabb7890d2cc0d267fbd84f409618c0303bc597b9244c324947bde4b1c0b4cb08c33fc461f7badd088535dae42d8d7d06f4134e442d9d1ce3a0f9b3edd64337a2d18ce34fcdc137b7cbd84f409618c03038feaec79f79c2f58bd84f409618c03038feaec79f79c2f58bd84f409618c03038feaec79f79c2f581790acb3c178641d14d8c09905bc52cf1c8249b12f2ede5ac3c8faf2fd8a686e";
  writemsgtofile(teststring);
  //deloldfile();
 }
}