使用Java代码书写日志的工具类

下面的一个Java代码工具类是用于书写日志信息到指定的文件，并且具有删除之前日志文件的功能。

 

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 * @author lanp * @since 2012-10-17 15:15:24 */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();}}

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