ReadWriteWorkbook


1   
2   /* ====================================================================
3      Copyright 2002-2004   Apache Software Foundation
4   
5      Licensed under the Apache License, Version 2.0 (the "License");
6      you may not use this file except in compliance with the License.
7      You may obtain a copy of the License at
8   
9          http://www.apache.org/licenses/LICENSE-2.0
10  
11     Unless required by applicable law or agreed to in writing, software
12     distributed under the License is distributed on an "AS IS" BASIS,
13     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14     See the License for the specific language governing permissions and
15     limitations under the License.
16  ==================================================================== */
17          
18  
19  package org.apache.poi.hssf.usermodel.examples;
20  
21  import org.apache.poi.poifs.filesystem.POIFSFileSystem;
22  import org.apache.poi.hssf.usermodel.HSSFWorkbook;
23  import org.apache.poi.hssf.usermodel.HSSFSheet;
24  import org.apache.poi.hssf.usermodel.HSSFRow;
25  import org.apache.poi.hssf.usermodel.HSSFCell;
26  
27  import java.io.FileInputStream  ;
28  import java.io.FileOutputStream  ;
29  import java.io.IOException  ;
30  
31  /**
32   * This example demonstrates opening a workbook, modifying it and writing
33   * the results back out.
34   *
35   * @author Glen Stampoultzis (glens at apache.org)
36   */
37  public class ReadWriteWorkbook
38  {
39      public static void main(String  [] args)
40          throws IOException  
41      {
42          FileInputStream   fileIn = null;
43          FileOutputStream   fileOut = null;
44  
45          try
46          {
47              fileIn = new FileInputStream  ("workbook.xls");
48              POIFSFileSystem fs = new POIFSFileSystem(fileIn);
49              HSSFWorkbook wb = new HSSFWorkbook(fs);
50              HSSFSheet sheet = wb.getSheetAt(0);
51              HSSFRow row = sheet.getRow(2);
52              if (row == null)
53                  row = sheet.createRow(2);
54              HSSFCell cell = row.getCell((short)3);
55              if (cell == null)
56                  cell = row.createCell((short)3);
57              cell.setCellType(HSSFCell.CELL_TYPE_STRING);
58              cell.setCellValue("a test");
59  
60              // Write the output to a file
61              fileOut = new FileOutputStream  ("workbook.xls");
62              wb.write(fileOut);
63          }
64          finally
65          {
66              if (fileOut != null)
67                  fileOut.close();
68              if (fileIn != null)
69                  fileIn.close();
70          }
71      }
72  }
73
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