【POI】修改Excel内容

 

 

  1 package com.what21.test;
  2  
  3 import java.io.File;
  4 import java.io.FileInputStream;
  5 import java.io.FileNotFoundException;
  6 import java.io.FileOutputStream;
  7 import java.io.IOException;
  8  
  9 import org.apache.poi.hssf.usermodel.HSSFCell;
 10 import org.apache.poi.hssf.usermodel.HSSFRow;
 11 import org.apache.poi.hssf.usermodel.HSSFSheet;
 12 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 13 import org.apache.poi.xssf.usermodel.XSSFCell;
 14 import org.apache.poi.xssf.usermodel.XSSFSheet;
 15 import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 16  
 17 public class TestPoi {
 18     public static void updateExcel(File exlFile, String sheetName, int col,
 19             int row, String value) throws Exception {
 20         FileInputStream fis = new FileInputStream(exlFile);
 21         HSSFWorkbook workbook = new HSSFWorkbook(fis);
 22         // workbook.
 23         HSSFSheet sheet = workbook.getSheet(sheetName);
 24         HSSFCell mycell = sheet.createRow(row).createCell(col);
 25         mycell.setCellValue(value);
 26         HSSFRow r = sheet.getRow(row);
 27         HSSFCell cell = r.getCell(col);
 28         // int type=cell.getCellType();
 29         String str1 = cell.getStringCellValue();
 30         // 这里假设对应单元格原来的类型也是String类型
 31         cell.setCellValue(value);
 32         System.out.println("单元格原来值为" + str1);
 33         System.out.println("单元格值被更新为" + value);
 34  
 35         fis.close();// 关闭文件输入流
 36  
 37         FileOutputStream fos = new FileOutputStream(exlFile);
 38         workbook.write(fos);
 39         fos.close();// 关闭文件输出流
 40     }
 41  
 42     public static void update2(String url) {
 43         int coloum = 2; // 好比你要获取第1列
 44         try {
 45             HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(url));
 46             HSSFSheet sheet = workbook.getSheet("Sheet1");
 47  
 48             for (int i = 0; i <= sheet.getLastRowNum(); i++) {
 49                 HSSFRow row = sheet.getRow((short) i);
 50                 if (null == row) {
 51                     continue;
 52                 } else {
 53                     HSSFCell cell = row.getCell((short) coloum);
 54                     if (null == cell) {
 55                         continue;
 56                     } else {
 57  
 58                         cell.setCellValue("he1");
 59                     }
 60                 }
 61             }
 62             FileOutputStream out = null;
 63             try {
 64                 out = new FileOutputStream(url);
 65                 workbook.write(out);
 66             } catch (IOException e) {
 67                 e.printStackTrace();
 68             } finally {
 69                 try {
 70                     out.close();
 71                 } catch (IOException e) {
 72                     e.printStackTrace();
 73                 }
 74             }
 75         } catch (FileNotFoundException e) {
 76             e.printStackTrace();
 77         } catch (IOException e) {
 78             e.printStackTrace();
 79         }
 80     }
 81  
 82     public static boolean writeXlsx(String fileName, int row, int column,
 83             String content) {
 84         boolean flag = false;
 85         FileOutputStream out = null;
 86         XSSFWorkbook xwb;
 87         try {
 88             xwb = new XSSFWorkbook(new FileInputStream(fileName));
 89             XSSFSheet xSheet = xwb.getSheetAt(0);
 90             XSSFCell xCell = xSheet.createRow(row).createCell(column);
 91             xCell.setCellValue(content);
 92             out = new FileOutputStream(fileName);
 93             xwb.write(out);
 94             out.close();
 95             flag = true;
 96         } catch (IOException e) {
 97             e.printStackTrace();
 98         } catch (RuntimeException e) {
 99             e.printStackTrace();
100         }
101         return flag;
102     }
103  
104     public static void main(String[] args) throws Exception {
105         // TODO Auto-generated method stub
106         // 下面改为你本身的xls文件进行测试，2003格式的，不能2007
107         File file = new File("C:\\Users\\Administrator\\Desktop\\test.xls");
108         // 下面尝试更改第一行第一列的单元格的值
109         updateExcel(file, "Sheet1", 0, 0, "hehe");
110         update2("C:\\Users\\Administrator\\Desktop\\test.xls");
111         File file1 = new File(
112                 "C:\\Users\\Administrator\\Desktop\\test - 副本.xlsx");
113         writeXlsx("C:\\Users\\Administrator\\Desktop\\test - 副本.xlsx", 0, 0,
114                 "1");
115     }
116 }

View Code

 

　　注意事项：若是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：若是定位错误，会带来没必要要的麻烦。

　　一般在生成原始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，能够

有效的避免由于空单元格而致使列数据错位的问题。

　　上面的代码是很常见的，在网上能找到一堆。根据不一样的场景能够传入一组须要修改的坐标，经过循环来修改。这样能够减小打开文件的次数，提升

效率。