Java讀寫Excel

Java讀寫Excel

工作中經常需要對Excel進行讀寫操作，java操作excel文件比較流行的是apache poi包，excel分爲xls（2003）和xlsx（2007）兩種格式，操作這兩種格式的excel需要不同的poi包。

• xls格式

  <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi</artifactId>
      <version>3.11-beta1</version>
  </dependency>
  

• xlsx格式

  <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi-ooxml</artifactId>
      <version>3.11-beta1</version>
  </dependency>
  

讀xls

    File file = new File("src/test/resources/test.xls");
    POIFSFileSystem poifsFileSystem = new POIFSFileSystem(new       FileInputStream(file));
    HSSFWorkbook hssfWorkbook =  new HSSFWorkbook(poifsFileSystem);
    HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(0);

    int rowstart = hssfSheet.getFirstRowNum();
    int rowEnd = hssfSheet.getLastRowNum();
    for(int i=rowstart;i<=rowEnd;i++)
    {
        HSSFRow row = hssfSheet.getRow(i);
        if(null == row) continue;
        int cellStart = row.getFirstCellNum();
        int cellEnd = row.getLastCellNum();

        for(int k=cellStart;k<=cellEnd;k++)
        {
            HSSFCell cell = row.getCell(k);
            if(null==cell) continue;
            System.out.print("" + k + "  ");
            //System.out.print("type:"+cell.getCellType());

            switch (cell.getCellType())
            {
                case HSSFCell.CELL_TYPE_NUMERIC: // 數字
                                System.out.print(cell.getNumericCellValue()
                            + "   ");
                    break;
                case HSSFCell.CELL_TYPE_STRING: // 字符串
                    System.out.print(cell.getStringCellValue()
                            + "   ");
                    break;
                case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean
                    System.out.println(cell.getBooleanCellValue()
                            + "   ");
                    break;
                case HSSFCell.CELL_TYPE_FORMULA: // 公式
                    System.out.print(cell.getCellFormula() + "   ");
                    break;
                case HSSFCell.CELL_TYPE_BLANK: // 空值
                    System.out.println(" ");
                    break;
                case HSSFCell.CELL_TYPE_ERROR: // 故障
                    System.out.println(" ");
                    break;
                default:
                    System.out.print("未知類型   ");
                    break;
            }

        }
        System.out.print("\n");
    }

讀xlsx

    File file = new File("src/test/resources/test.xlsx");

    XSSFWorkbook xssfWorkbook = new XSSFWorkbook(file);
    XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(0);

    int rowstart = xssfSheet.getFirstRowNum();
    int rowEnd = xssfSheet.getLastRowNum();
    for(int i=rowstart;i<=rowEnd;i++)
    {
        XSSFRow row = xssfSheet.getRow(i);
        if(null == row) continue;
        int cellStart = row.getFirstCellNum();
        int cellEnd = row.getLastCellNum();

        for(int k=cellStart;k<=cellEnd;k++)
        {
            XSSFCell cell = row.getCell(k);
            if(null==cell) continue;

            switch (cell.getCellType())
            {
                case HSSFCell.CELL_TYPE_NUMERIC: // 數字
                    System.out.print(cell.getNumericCellValue()
                            + "   ");
                    break;
                case HSSFCell.CELL_TYPE_STRING: // 字符串
                    System.out.print(cell.getStringCellValue()
                            + "   ");
                    break;
                case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean
                    System.out.println(cell.getBooleanCellValue()
                            + "   ");
                    break;
                case HSSFCell.CELL_TYPE_FORMULA: // 公式
                    System.out.print(cell.getCellFormula() + "   ");
                    break;
                case HSSFCell.CELL_TYPE_BLANK: // 空值
                    System.out.println(" ");
                    break;
                case HSSFCell.CELL_TYPE_ERROR: // 故障
                    System.out.println(" ");
                    break;
                default:
                    System.out.print("未知類型   ");
                    break;
            }

        }
        System.out.print("\n");
    }

寫xls

    HSSFWorkbook workbook = null;
    workbook = new HSSFWorkbook();
    //獲取參數個數作爲excel列數
    int columeCount = 6;
    //獲取List size作爲excel行數
    int rowCount = 20;
    HSSFSheet sheet = workbook.createSheet("sheet name");
    //創建第一欄
    HSSFRow headRow = sheet.createRow(0);
    String[] titleArray = {"id", "name", "age", "email", "address", "phone"};
    for(int m=0;m<=columeCount-1;m++)
    {
        HSSFCell cell = headRow.createCell(m);
        cell.setCellType(HSSFCell.CELL_TYPE_STRING);
        sheet.setColumnWidth(m, 6000);
        HSSFCellStyle style = workbook.createCellStyle();
        HSSFFont font = workbook.createFont();
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        short color = HSSFColor.RED.index;
        font.setColor(color);
        style.setFont(font);
        //填寫數據
        cell.setCellStyle(style);
        cell.setCellValue(titleArray[m]);

    }
    int index = 0;
    //寫入數據
    for(RowEntity entity : pRowEntityList)
    {
        //logger.info("寫入一行");
        HSSFRow row = sheet.createRow(index+1);
        for(int n=0;n<=columeCount-1;n++)
            row.createCell(n);
        row.getCell(0).setCellValue(entity.getId());
        row.getCell(1).setCellValue(entity.getName());
        row.getCell(2).setCellValue(entity.getAge());
        row.getCell(3).setCellValue(entity.getEmail());
        row.getCell(4).setCellValue(entity.getAddress());
        row.getCell(5).setCellValue(entity.getPhone());
        index++;
    }