日期:2014-05-20  浏览次数:21030 次

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\\新規.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

------解决方案--------------------
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
------解决方案--------------------
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();

------解决方案--------------------
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();
        }

    }

}