java操作poi怎么更改excel中的数据
如题 现在要更改excel表中的数据 在网上找到个方法 按照他的写法数据没有修改成功
- Java code
public static void test() { String fileToBeRead = "C:\\project_TMP\\testPrj\\新.xls"; // excel位置 int coloum = 3; // 比如你要获取第三列 try { HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream( fileToBeRead)); HSSFSheet sheet = workbook.getSheet("Sheet1"); for (int i = 0; i <= sheet.getLastRowNum(); i++) { HSSFRow row = sheet.getRow((short) i); if (null == row) { continue; } else { HSSFCell cell = row.getCell((short) 3); if (null == cell) { continue; } else { System.out.println(cell.getStringCellValue()); int temp = Integer.parseInt(cell.getStringCellValue()); cell.setCellValue(temp + 1); } } } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }这个代码是网上的 我按照他的鞋 但是操作后 数据还是原来的 没有更改 请大神教教 谢谢
[解决办法]
修改文件最后还需要通过IO流操作来保存更改，这其实是很关键的一步，你代码里面没有IO的关闭操作，导致了数据的修改没有保存
[解决办法]
修改的只是内存中的副本，还有自己主动写文件的，如
FileOutputStream stream;
stream = new FileOutputStream(new File(fileToBeRead ));
workbook.write(stream);
stream.close();
[解决办法]
修改完cell的值 还需要保存一下excel
- Java code
import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook;public class ChangeCell { @SuppressWarnings("deprecation") public static void main(String[] args) { String fileToBeRead = "C:\\exp.xls"; // excel位置 int coloum = 1; // 比如你要获取第1列 try { HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream( fileToBeRead)); HSSFSheet sheet = workbook.getSheet("Sheet1"); for (int i = 0; i <= sheet.getLastRowNum(); i++) { HSSFRow row = sheet.getRow((short) i); if (null == row) { continue; } else { HSSFCell cell = row.getCell((short) coloum); if (null == cell) { continue; } else { System.out.println(cell.getNumericCellValue()); int temp = (int) cell.getNumericCellValue(); cell.setCellValue(temp + 1); } } } FileOutputStream out = null; try { out = new FileOutputStream(fileToBeRead); workbook.write(out); } catch (IOException e) { e.printStackTrace(); } finally { try { out.close(); } catch (IOException e) { e.printStackTrace(); } } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }}
[解决办法]
给你贴一个具体的更改实例，实例修改的是第一个sheet 第一行第一列的值 ，你自己改一下测试的文件路径就OK
- Java code
package poi.excel;import org.apache.poi.poifs.filesystem.POIFSFileSystem;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.xssf.usermodel.XSSFWorkbook;import org.apache.poi.xssf.usermodel.XSSFSheet;import org.apache.poi.xssf.usermodel.XSSFRow;import org.apache.poi.xssf.usermodel.XSSFCell;import java.io.*;import java.util.Date;import java.sql.Timestamp;import java.text.DecimalFormat;/** * Created by IntelliJ IDEA. * User: admin * Date: 2011-10-10 * Time: 16:10:29 * To change this template use File | Settings | File Templates. */public class UpdateExcel2003 { /** * 只是一个demo，这里假设修改的值是String类型 * @param exlFile * @param sheetIndex * @param col * @param row * @param value * @throws Exception */ public static void updateExcel(File exlFile,int sheetIndex,int col,int row,String value)throws Exception{ FileInputStream fis=new FileInputStream(exlFile); HSSFWorkbook workbook=new HSSFWorkbook(fis);// workbook. HSSFSheet sheet=workbook.getSheetAt(sheetIndex); HSSFRow r=sheet.getRow(row); HSSFCell cell=r.getCell(col);// int type=cell.getCellType(); String str1=cell.getStringCellValue(); //这里假设对应单元格原来的类型也是String类型 cell.setCellValue(value); System.out.println("单元格原来值为"+str1); System.out.println("单元格值被更新为"+value); fis.close();//关闭文件输入流 FileOutputStream fos=new FileOutputStream(exlFile); workbook.write(fos); fos.close();//关闭文件输出流 } private String getCellValue(HSSFCell cell) { String cellValue = ""; DecimalFormat df = new DecimalFormat("#"); switch (cell.getCellType()) { case XSSFCell.CELL_TYPE_STRING: cellValue = cell.getRichStringCellValue().getString().trim(); break; case XSSFCell.CELL_TYPE_NUMERIC: cellValue = df.format(cell.getNumericCellValue()).toString(); break; case XSSFCell.CELL_TYPE_BOOLEAN: cellValue = String.valueOf(cell.getBooleanCellValue()).trim(); break; case XSSFCell.CELL_TYPE_FORMULA: cellValue = cell.getCellFormula(); break; default: cellValue = ""; } return cellValue; } /** * @param args */ public static void main(String[] args) throws Exception{ // TODO Auto-generated method stub// 下面改成你自己的xls文件进行测试，2003格式的，不能2007 File file=new File("resources/excel/stuInfo.xls"); //下面尝试更改第一行第一列的单元格的值 UpdateExcel2003.updateExcel(file,0,0,0,"更改测试"); }}