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java 常用工具类,作为 apache-commons的补充
There is a newer version: 5.3.2302
package com.centit.support.file;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.centit.support.algorithm.DatetimeOpt;

/**
 * 
 * 这个类是用来对纯文本的文件追加文本内容
 * 可以用来写操作日志
 * 
 * 他有两组函数，一组静态函数打开、写入、关闭 一次完成
 *                 一组是类成员函数，可以打开，重复写入，关闭，
 * 两组成员函数用于不同的场合
 * 
 * @author codefan
 */
@SuppressWarnings("unused")
public class TxtLogFile {
    protected static final Logger logger = LoggerFactory.getLogger(TxtLogFile.class);
    public static void writeLog(String sLogFileName,String slog, boolean bNewLine,boolean bShowTime){
        try(BufferedWriter bw = new BufferedWriter(
                 new FileWriter(sLogFileName))){
            if(bShowTime)
                bw.write(DatetimeOpt.convertDateToString(DatetimeOpt.currentUtilDate(), DatetimeOpt.getDateTimePattern()));
            if(bNewLine){
                bw.write(slog+"\r\n");
            }else{
                bw.write(slog);
            }
            bw.flush();
        } catch (IOException e) {
            logger.error(e.getMessage(),e);//e.printStackTrace();
        }
    }

    public static void writeLogEx(String sLogFileName,String slog, boolean bNewLine,boolean bShowTime){
        try(BufferedWriter bw = new BufferedWriter(
                 new FileWriter(sLogFileName))){
            if(bShowTime){
                bw.write(DatetimeOpt.convertDateToString(DatetimeOpt.currentUtilDate(), DatetimeOpt.getDateTimePattern()));
                //System.out.print(DatetimeOpt.convertDateToString(DatetimeOpt.currentUtilDate(), DatetimeOpt.getDateTimePattern()));
            }
            if(bNewLine){
                bw.write(slog+"\r\n");
                //System.out.println(slog);
            }else{
                bw.write(slog);
                //System.out.print(slog);
            }
            //bw.close();
        } catch (IOException e) {
            logger.error(e.getMessage(),e);//e.printStackTrace();
        }
    }


    public static void writeLog(String sLogFileName,String slog){
        try(BufferedWriter bw = new BufferedWriter(
                     new FileWriter(sLogFileName))){
            bw.write(slog);
            //bw.close();
        } catch (IOException e) {
            logger.error(e.getMessage(),e);//e.printStackTrace();
        }
    }

    private BufferedWriter logWriter;
    private FileWriter fileWriter;

    public boolean openLogFile(String sLogFileName){
        closeLogFile();
        boolean bOpened = false;
        try {
            fileWriter = new FileWriter(sLogFileName);
            logWriter = new BufferedWriter(fileWriter);
            bOpened = true;
        } catch (IOException e) {
            logger.error(e.getMessage(),e);//e.printStackTrace();
        }
        return bOpened;
    }

    public boolean closeLogFile(){
        boolean bClosed = false;
        try {
            if(logWriter!=null ) {
                logWriter.close();
                fileWriter.close();
            }
            logWriter = null;
            bClosed = true;
        } catch (IOException e) {
            logger.error(e.getMessage(),e);//e.printStackTrace();
        }
        return bClosed;
    }

    public void writeLog(String slog, boolean bNewLine,boolean bShowTime){
        try {
            if(bShowTime)
                logWriter.write(DatetimeOpt.convertDateToString(DatetimeOpt.currentUtilDate(), DatetimeOpt.getDateTimePattern()));
            if(bNewLine){
                logWriter.write(slog+"\r\n");
            }else{
                logWriter.write(slog);
            }
        } catch (IOException e) {
            logger.error(e.getMessage(),e);//e.printStackTrace();
        }
    }

    public void writeLogEx(String slog, boolean bNewLine,boolean bShowTime){
        try {
            if(bShowTime){
                logWriter.write(DatetimeOpt.convertDateToString(DatetimeOpt.currentUtilDate(), DatetimeOpt.getDateTimePattern()));
                System.out.print(DatetimeOpt.convertDateToString(DatetimeOpt.currentUtilDate(), DatetimeOpt.getDateTimePattern()));
            }
            if(bNewLine){
                logWriter.write(slog+"\r\n");
                //System.out.println(slog);
            }else{
                logWriter.write(slog);
                //System.out.print(slog);
            }
        } catch (IOException e) {
            logger.error(e.getMessage(),e);//e.printStackTrace();
        }
    }
}