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();  } }