请问下如何给java文件添加配置文件啊

 import java.io.File;

import java.io.IOException;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;



import jxl.Sheet;

import jxl.Workbook;

import jxl.read.biff.BiffException;

import jxl.write.Label;

import jxl.write.WritableSheet;

import jxl.write.WritableWorkbook;











public class zijixiedefangfa {

    public static void main(String[] args) throws BiffException, IOException, ParseException {

        String fileName = "D://Io//jisuan.xls"; // Excel文件所在路径  

        File file = new File(fileName); // 创建文件对象  

        Workbook wb = Workbook.getWorkbook(file); // 从文件流中获取Excel工作区对象（WorkBook）  

        Sheet sheet = wb.getSheet(0); // 从工作区中取得页（Sheet）



        int n =0;

        Date min = null;



        String firm = ""; //定义公司

        String name = ""; //定义姓名

        String day = ""; //定义日期

        String time_start = ""; //定义最早时间

        String time_end = "";  //定义最晚时间



        List shuju = new ArrayList();   //定义总的传入集合

        List bumen = new ArrayList();  //部门

        List xingming = new ArrayList();   //姓名

        List date = new ArrayList();   //日期

        List earlyTime = new ArrayList();  //上班时间

        List endTime = new ArrayList<Date>();    //下班时间

        List workTime = new ArrayList();  //上班时间

        List chidao  = new ArrayList();  //迟到

        List zaotui  = new ArrayList();   //早退



        //最晚上班时间

        SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");

        Date biaozhun  = df.parse("10:00:00");



    while(n<sheet.getRows()){

        //这一天的最早上班时间

        firm = sheet.getCell(0,shuju.size()).getContents();

        name = sheet.getCell(1,shuju.size()).getContents();

        day = sheet.getCell(2,shuju.size()).getContents();

        time_start = sheet.getCell(3,shuju.size()).getContents();



        bumen.add(sheet.getCell(0,shuju.size()).getContents());

        xingming.add(sheet.getCell(1,shuju.size()).getContents());

        date.add(sheet.getCell(2,shuju.size()).getContents());

        earlyTime.add(sheet.getCell(3,shuju.size()).getContents());

        //判断是否迟到        

        if(df.parse(sheet.getCell(3,shuju.size()).getContents()).getTime()>biaozhun.getTime()){

            chidao.add("迟到");

        }else{

            chidao.add("");

                    }



    while(n<sheet.getRows()){   

        //如果前三条数据一样的话 说明是同一天

        if(sheet.getCell(0,n).getContents().equals(firm) && sheet.getCell(1,n).getContents().equals(name) && sheet.getCell(2,n).getContents().equals(day) ){

            shuju.add(sheet.getCell(3,n).getContents());

        }else{

            break;

        }

        n++;

        }   

        //当前三条数据不一样时 退出当前while循环 数组长度减1的下标就是下班时间

        endTime.add(sheet.getCell(3,shuju.size()-1).getContents());

        }



        for (int i = 0; i < earlyTime.size(); i++) {

        try {

        workTime.add((df.parse((String) endTime.get(i)).getTime()-df.parse((String) earlyTime.get(i)).getTime())/3600000+"小时");

        //判断是否早退

        if((df.parse((String) endTime.get(i)).getTime()-df.parse((String) earlyTime.get(i)).getTime())/3600000>=8){

        zaotui.add("");

        }else{

        zaotui.add("早退");

        }

        } catch (ParseException e) {

        e.printStackTrace();

        }

        }

        //关闭读取流

        wb.close();





        try {

        //打开写入流 

        WritableWorkbook book = Workbook.createWorkbook(new File("D://Io//stu.xls"));  

        // 生成名为“sheet1”的工作表，参数0表示这是第一页  

        WritableSheet kaoqin = book.createSheet("kaoqin", 0);



        //写入部门 

        for (int i = 0; i < bumen.size(); i++) {

        Label label = new Label(0, i,  (String) bumen.get(i));  

        // 将定义好的单元格添加到工作表中  

        kaoqin.addCell(label); 

        } 



        //写入姓名

        for (int i = 0; i < xingming.size(); i++) {

        Label label = new Label(1, i,  (String) xingming.get(i));   

        kaoqin.addCell(label); 

        } 



        //写入日期

        for (int i = 0; i < date.size(); i++) {

        Label label = new Label(2, i,  (String) date.get(i));    

        kaoqin.addCell(label); 

        } 



        //写入上班时间

        for (int i = 0; i < earlyTime.size(); i++) {

        Label label = new Label(3, i,  (String) earlyTime.get(i));  

        kaoqin.addCell(label); 

        } 





        //写入下班时间

        for (int i = 0; i < endTime.size(); i++) {

        Label label = new Label(4, i,  (String) endTime.get(i));   

        kaoqin.addCell(label); 

        } 



        //写入总共上班时间

        for (int i = 0; i < workTime.size(); i++) {

        Label label = new Label(5, i,   (String) workTime.get(i)) ;  

        kaoqin.addCell(label); 

        } 



        //加入迟到



        for (int i = 0; i < chidao.size(); i++) {

        Label label = new Label(6, i,   (String) chidao.get(i)) ;  

        kaoqin.addCell(label); 

        } 



        //写入早退

        for (int i = 0; i < zaotui.size(); i++) {

        Label label = new Label(7, i,   (String) zaotui.get(i)) ;  

        kaoqin.addCell(label); 

        } 



        book.write();    //执行写入操作

        book.close();     //关闭流



        }catch (Exception e) {

        System.out.println(e);  



    }

}

}