【POI】修改Excel内容

 

 

package com.what21.test;
 
import java.io.File;
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;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 
public class TestPoi {
    public static void updateExcel(File exlFile, String sheetName, int col,
            int row, String value) throws Exception {
        FileInputStream fis = new FileInputStream(exlFile);
        HSSFWorkbook workbook = new HSSFWorkbook(fis);
        // workbook.
        HSSFSheet sheet = workbook.getSheet(sheetName);
        HSSFCell mycell = sheet.createRow(row).createCell(col);
        mycell.setCellValue(value);
        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
    }
 
    public static void update2(String url) {
        int coloum = 2; // 比如你要获取第1列
        try {
            HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(url));
            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 {
 
                        cell.setCellValue("he1");
                    }
                }
            }
            FileOutputStream out = null;
            try {
                out = new FileOutputStream(url);
                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();
        }
    }
 
    public static boolean writeXlsx(String fileName, int row, int column,
            String content) {
        boolean flag = false;
        FileOutputStream out = null;
        XSSFWorkbook xwb;
        try {
            xwb = new XSSFWorkbook(new FileInputStream(fileName));
            XSSFSheet xSheet = xwb.getSheetAt(0);
            XSSFCell xCell = xSheet.createRow(row).createCell(column);
            xCell.setCellValue(content);
            out = new FileOutputStream(fileName);
            xwb.write(out);
            out.close();
            flag = true;
        } catch (IOException e) {
            e.printStackTrace();
        } catch (RuntimeException e) {
            e.printStackTrace();
        }
        return flag;
    }
 
    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("C:\\Users\\Administrator\\Desktop\\test.xls");
        // 下面尝试更改第一行第一列的单元格的值
        updateExcel(file, "Sheet1", 0, 0, "hehe");
        update2("C:\\Users\\Administrator\\Desktop\\test.xls");
        File file1 = new File(
                "C:\\Users\\Administrator\\Desktop\\test - 副本.xlsx");
        writeXlsx("C:\\Users\\Administrator\\Desktop\\test - 副本.xlsx", 0, 0,
                "1");
    }
}

　　注意事项：如果修改的坐标对应的单元格是空，会报错。

　　建议这么写：

　　HSSFCell mycell = sheet.createRow(row).createCell(col);
　　mycell.setCellValue(value);

　　这样写有一个问题：如果定位错误，会带来不必要的麻烦。

　　通常在生成原始Excel时，最好能对空单元格赋空（强制添加空字符串），这样在使用SAXPOI或者SAX解析较大文本的Excel的时候，可以

有效的避免因为空单元格而导致列数据错位的问题。

　　上面的代码是很常见的，在网上能找到一堆。根据不同的场景可以传入一组需要修改的坐标，通过循环来修改。这样可以减少打开文件的次数，提高

效率。