Apache POI 读写 Excel file (.xls or .xlsx)

Apache POI 是 Apache 软件基金会的开放源码函式库，POI 提供 API 给 Java 程序对 Microsoft Office 格式档案读和写的功能。

这里演示了 POI 对新版 Excel (.xlsx) 和 旧版 Excel (.xls) 两种格式文件的读写操作。

POI 下载处 http://poi.apache.org/

需要导入的 jar

xmlbeans-2.6.0.jar （POI 完整包内的 ooxml-lib 目录内）

curvesapi-1.03.jar （POI 完整包内的 ooxml-lib 目录内）

poi-3.14-20160307.jar

poi-excelant-3.14-20160307.jar

poi-ooxml-3.14-20160307.jar

poi-ooxml-schemas-3.14-20160307.jar

poi-scratchpad-3.14-20160307.jar

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

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.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ReadWriteExcelFile
{

  public static void readXLSFile() throws IOException
  {
    InputStream ExcelFileToRead = new FileInputStream("C:/Test.xls");
    HSSFWorkbook wb = new HSSFWorkbook(ExcelFileToRead);

    HSSFSheet sheet = wb.getSheetAt(0);
    HSSFRow row;
    HSSFCell cell;

    Iterator rows = sheet.rowIterator();

    while (rows.hasNext())
    {
      row = (HSSFRow) rows.next();
      Iterator cells = row.cellIterator();

      while (cells.hasNext())
      {
        cell = (HSSFCell) cells.next();

        if (cell.getCellType() == HSSFCell.CELL_TYPE_STRING)
        {
          System.out.print(cell.getStringCellValue() + " ");
        }
        else if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC)
        {
          System.out.print(cell.getNumericCellValue() + " ");
        }
        else
        {
          // U Can Handel Boolean, Formula, Errors
        }
      }
      System.out.println();
    }

  }

  public static void writeXLSFile() throws IOException
  {

    String excelFileName = "C:/Test.xls";// name of excel file

    String sheetName = "Sheet1";// name of sheet

    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet = wb.createSheet(sheetName);

    // iterating r number of rows
    for (int r = 0; r < 5; r++)
    {
      HSSFRow row = sheet.createRow(r);

      // iterating c number of columns
      for (int c = 0; c < 5; c++)
      {
        HSSFCell cell = row.createCell(c);

        cell.setCellValue("Cell " + r + " " + c);
      }
    }

    FileOutputStream fileOut = new FileOutputStream(excelFileName);

    // write this workbook to an Outputstream.
    wb.write(fileOut);
    fileOut.flush();
    fileOut.close();
  }

  public static void readXLSXFile() throws IOException
  {
    InputStream ExcelFileToRead = new FileInputStream("C:/Test.xlsx");
    XSSFWorkbook wb = new XSSFWorkbook(ExcelFileToRead);

    XSSFWorkbook test = new XSSFWorkbook();

    XSSFSheet sheet = wb.getSheetAt(0);
    XSSFRow row;
    XSSFCell cell;

    Iterator rows = sheet.rowIterator();

    while (rows.hasNext())
    {
      row = (XSSFRow) rows.next();
      Iterator cells = row.cellIterator();
      while (cells.hasNext())
      {
        cell = (XSSFCell) cells.next();

        if (cell.getCellType() == XSSFCell.CELL_TYPE_STRING)
        {
          System.out.print(cell.getStringCellValue() + " ");
        }
        else if (cell.getCellType() == XSSFCell.CELL_TYPE_NUMERIC)
        {
          System.out.print(cell.getNumericCellValue() + " ");
        }
        else
        {
          // U Can Handel Boolean, Formula, Errors
        }
      }
      System.out.println();
    }

  }

  public static void writeXLSXFile() throws IOException
  {

    String excelFileName = "C:/Test.xlsx";// name of excel file

    String sheetName = "Sheet1";// name of sheet

    XSSFWorkbook wb = new XSSFWorkbook();
    XSSFSheet sheet = wb.createSheet(sheetName);

    // iterating r number of rows
    for (int r = 0; r < 5; r++)
    {
      XSSFRow row = sheet.createRow(r);

      // iterating c number of columns
      for (int c = 0; c < 5; c++)
      {
        XSSFCell cell = row.createCell(c);

        cell.setCellValue("Cell " + r + " " + c);
      }
    }

    FileOutputStream fileOut = new FileOutputStream(excelFileName);

    // write this workbook to an Outputstream.
    wb.write(fileOut);
    fileOut.flush();
    fileOut.close();
  }

  public static void main(String[] args) throws IOException
  {
    writeXLSFile();
    readXLSFile();

    writeXLSXFile();
    readXLSXFile();
  }
}

POI 所支持的文档格式

Component	Application type	Maven artifactId	Notes
POIFS	OLE2 Filesystem	poi	Required to work with OLE2 / POIFS based files
HPSF	OLE2 Property Sets	poi
HSSF	Excel XLS	poi	For HSSF only, if common SS is needed see below
HSLF	PowerPoint PPT	poi-scratchpad
HWPF	Word DOC	poi-scratchpad
HDGF	Visio VSD	poi-scratchpad
HPBF	Publisher PUB	poi-scratchpad
HSMF	Outlook MSG	poi-scratchpad
DDF	Escher common drawings	poi
HWMF	WMF drawings	poi-scratchpad
OpenXML4J	OOXML	poi-ooxml plus either poi-ooxml-schemas or ooxml-schemas and ooxml-security	See notes below for differences between these options
XSSF	Excel XLSX	poi-ooxml
XSLF	PowerPoint PPTX	poi-ooxml
XWPF	Word DOCX	poi-ooxml
Common SL	PowerPoint PPT and PPTX	poi-scratchpad and poi-ooxml	SL code is in the core POI jar, but implementations are in poi-scratchpad and poi-ooxml.
Common SS	Excel XLS and XLSX	poi-ooxml	WorkbookFactory and friends all require poi-ooxml, not just core poi

原文来自 https://gist.github.com/madan712/3912272

相关参考 https://poi.apache.org/spreadsheet/examples.html