java code about POI test

package com.king_w.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Set;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CreationHelper;
import org.apache.poi.ss.usermodel.DataFormat;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class POItest {
public static void main(String[] args) {



File file = new File("C:\\software\\data.xlsx");
File file1= new File("c:\\software\\data.txt");
InputStream is;
try {
//output
Workbook wb1 = new XSSFWorkbook();  
CreationHelper helper = wb1.getCreationHelper();  
Sheet sheet1 = wb1.createSheet("Sheet_1");
OutputStream os = new FileOutputStream(new File("c://software//datacopy.xlsx"));  
CellStyle cs = wb1.createCellStyle();
DataFormat df = wb1.createDataFormat();

Font f = wb1.createFont();
Font f2 = wb1.createFont();

//set font 1 to 12 point type
f.setFontHeightInPoints((short) 12);
//make it blue
f.setColor( (short)0xc );
// make it bold
//arial is the default font
f.setBoldweight(Font.BOLDWEIGHT_BOLD);

//set font 2 to 10 point type
f2.setFontHeightInPoints((short) 10);
//make it red
f2.setColor( (short)Font.COLOR_RED );
//make it bold
f2.setBoldweight(Font.BOLDWEIGHT_BOLD);

f2.setStrikeout( true );

//set cell stlye
cs.setFont(f);
//set the cell format
cs.setDataFormat(df.getFormat("#,##0.0"));

//set a thin border
cs.setBorderBottom(cs.BORDER_THIN);
//fill w fg fill color
cs.setFillPattern((short) CellStyle.SOLID_FOREGROUND);
//set the cell format to text see DataFormat for a full list
// cs.setDataFormat(XSSFDataFormat.getBuiltinFormat("text"));

// set the font
cs.setFont(f2);


//read the file
PrintWriter pw = new PrintWriter(file1);
is = new FileInputStream(file);
XSSFWorkbook wb = new XSSFWorkbook(is);
Sheet sheet = wb.getSheetAt(0);
String temp_locate = null;
String locate = null ;
String temp_corpname = null ;
String corpname = null ;
String money = null ;
String temp_code = null;
String code = null ;
double mon = 0;
int i = 0;
Set<String> s = null;
boolean flag = false;
for(Row row : sheet){  
           Cell cell0 = row.getCell(0);
           Cell cell1 = row.getCell(1);
           Cell cell2 = row.getCell(2);
           Cell cell3 = row.getCell(3);
           corpname = cell1.getStringCellValue();
                       locate = cell0.getStringCellValue();
                       code = cell2.getStringCellValue();
                       money = cell3.getStringCellValue();
//                       System.out.println("code: "+code + " money: " + money);
                       if(temp_corpname == null ){
                       temp_corpname = corpname;
           mon = Double.parseDouble(money);
//            System.out.println("tempname is null");
           continue;
           }
           if(temp_corpname !=null && corpname.equals(temp_corpname))
            { 
           temp_code = code;
           temp_locate = locate;
//            System.out.println("not null,but corpname is equal to tempname");
           mon += Double.parseDouble(money);
                           continue;
            }
                       if(temp_corpname != null && !corpname.equals(temp_corpname)){
                       //put the mon into new table
                       s.add(temp_corpname);
                       if(mon>=300000.0)
                       {
                      Row row1 = sheet1.createRow(i);  
                      Cell cell_a = row1.createCell(0);
                      Cell cell_b = row1.createCell(1);
                      Cell cell_c = row1.createCell(2);
                      Cell cell_d = row1.createCell(3);
                      Cell cell_e = row1.createCell(4);
                      System.out.println(temp_locate+ " "+ temp_corpname + " " +temp_code + " "+ mon);
                              cell_a.setCellValue(temp_locate);
                              cell_b.setCellValue(temp_corpname);
                              cell_c.setCellValue(temp_code);
                              cell_d.setCellValue(mon);
                              cell_e.setCellValue("2901");
//                       pw.println(temp_locate);
//                       pw.println(temp_corpname);
//                       pw.println(temp_code);
//                       pw.println(mon);
                       i++;
                       }
                       mon = Double.parseDouble(money);
                         }           
                       temp_corpname = corpname;
                       temp_code = code;
           temp_locate = locate;
            }
// pw.flush();
// pw.close();
wb1.write(os);  
        os.close();  
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}

}