!!!POI ワークブック、シート、セルの作成

 package info.typea.sample.poi.test;
 
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 
 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFRichTextString;
 import org.apache.poi.hssf.usermodel.HSSFRow;
 import org.apache.poi.hssf.usermodel.HSSFSheet;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 import org.apache.poi.poifs.filesystem.POIFSFileSystem;
 
 public class POITest {
   public static void main(String[] args) {
     try {
       POITest me = new POITest();
       File f = new File("c:\\work\\poi.xls");
       
       if (!f.exists()) {
                 // Bookを作成
         me.createNewWorkBook(f);
       
         // Sheetを追加
         String[] sheets = {"POIにより追加(1)","POIにより追加(2)"};
         for (String s : sheets) {
           me.addNewWorkSheet(f, s);
         }
       }
       String[][] data = {
            {"A1", "B1" , "C1" , "D",  "E"}
           ,{"A2", "B2" , "C2" , "D1"}
           ,{"A3", "B3" }
           ,{"A4", }
       };
       me.writeTableData(f, 0, data);
       
       System.out.println("finish.");
     } catch (Exception e) {
       e.printStackTrace();
     }
   }
   /**
    * ワークブックの作成
    * @param file
    * @throws Exception
    */
   public void createNewWorkBook(File file) throws Exception {
     FileOutputStream out = new FileOutputStream(file);
     HSSFWorkbook wb = new HSSFWorkbook();
     wb.write(out);
     out.close();
   }
   /**
    * シートの追加
    * @param file
    * @param shtName
    * @throws Exception
    */
   public void addNewWorkSheet(File file, String shtName) throws Exception {
     POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(file));
     HSSFWorkbook wb = new HSSFWorkbook(fs);
     wb.createSheet(shtName);
     
     FileOutputStream out = new FileOutputStream(file);
     wb.write(out);
     out.close();
   }
   
   /**
    * セルを作成し、データの書き込み
    * @param file
    * @param shtId
    * @param data
    * @throws Exception
    */
   public void writeTableData(File file, int shtId, String[][] data) throws Exception {
     POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(file));
     HSSFWorkbook wb = new HSSFWorkbook(fs);
     HSSFSheet sht = wb.getSheetAt(shtId);   
     
     int r=0;
     for (String[] row : data) {
       HSSFRow xlsrow = sht.createRow(r++);
       short c=0;
       for (String col : row) {
         HSSFCell xlscell =  xlsrow.createCell(c++);
         xlscell.setCellValue(new HSSFRichTextString(col));
       }
     }
 
     FileOutputStream out = new FileOutputStream(file);
     wb.write(out);
     out.close();
   }
 }