使用Java代码书写日志的工具类

骑猪看日落 2022-05-21 05:36 150阅读 0赞

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();
    	}
    
    }

OK,TKS!