POI ワークブック、シート、セルの作成

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();
  }
}