java用poi操作excel，2003,2007,2010

原文: http://happyqing.iteye.com/blog/1965570
通过POI统一读取Excel文件（兼容97-2003和2007+两种格式） http://cgs1999.iteye.com/blog/1525665
java中 使用poi导出Excel详解 http://gaochun091024.blog.51cto.com/6643038/1242195
Apache POI 读取、写入Excel文件教程 http://05150212.iteye.com/blog/353428
java操作poi怎么 更改excel中的数据  http://bbs.csdn.net/topics/370237960
POI 对 Excel 单元格 颜色操作实例 http://www.oschina.net/code/snippet_12_16825
POI做导出Excel2003设置单元格中字体大小 颜色，合并行列 http://blog.csdn.net/kunkun378263/article/details/9040639
POI格式化Cell样式2007/2010 http://www.bug315.com/article/6.htm
POI对Excel自定义日期格式的读取 http://yl-fighting.iteye.com/blog/1726285
POI读取Excel常见问题 http://blog.csdn.net/ghsau/article/details/10163043
使用Apache POI写的一个生成/解析 Excel的工具类 http://my.oschina.net/simpleton/blog/487510


使用POI修改Excel后进行保存 http://my.oschina.net/Early20/blog/515081

读取数据:

package com.urt.module.excel;

import java.io.FileInputStream;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelPoi {
	public static void main(String[] args) {
		String fileToBeRead = "D:\\test.xlsx";
        Workbook workbook;
        try {
            if (fileToBeRead.indexOf(".xlsx") > -1) {
                workbook = new XSSFWorkbook(new FileInputStream(fileToBeRead));
            } else {
                workbook = new HSSFWorkbook(new FileInputStream(fileToBeRead));
            }
            //HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(fileToBeRead)); //2003 创建对Excel工作簿文件的引用
            //XSSFWorkbook workbook = new XSSFWorkbook(new FileInputStream(fileToBeRead)); //2007,2010 创建对Excel工作簿文件的引用
            Sheet sheet = workbook.getSheet("Sheet1"); // 创建对工作表的引用
            int rows = sheet.getPhysicalNumberOfRows();// 获取表格的
            int cells = 0;
            for (int r = 0; r < rows; r++) { // 循环遍历表格的行
                if (r == 0) {
                    //在第一行标题行计算出列宽度,因为数据行中可能会有空值
                    cells = sheet.getRow(r).getLastCellNum();
                    continue;
                }
                String value = "";
                Row row = sheet.getRow(r); // 获取单元格中指定的行对象
                if (row != null) {
                    //int cells = row.getPhysicalNumberOfCells();// 获取一行中的单元格数
                    //int cells = row.getLastCellNum();// 获取一行中最后单元格的编号（从1开始                    for (short c = 0; c < cells; c++) { // 循环遍历单元格中的列
                    for (short c = 0; c < cells; c++) {
                        Cell cell = row.getCell((short) c); // 获取指定单元格中的列
                        if (cell != null) {
                            if (cell.getCellType() == Cell.CELL_TYPE_STRING) { // 判断单元格的值是否为字符串类型
                                value += cell.getStringCellValue() + ",";
                            } else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) { // 判断单元格的值是否为数字类型
                                //if(DateUtil.isCellDateFormatted(cell)){
                                //  cell.getDateCellValue();
                                //日期型&nbsp;
                                //}
                                value += cell.getNumericCellValue() + ",";
                            } else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) { // 判断单元格的值是否为布尔类型
                                value += cell.getStringCellValue() + ",";
                            }
                        }
                    }
                }
                String[] str = value.split(",");
                System.out.println(value);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
}

创建:

import org.apache.poi.hssf.usermodel.*;
import java.io.FileOutputStream;
import java.io.IOException;
publicclass CreateCells
{
publicstaticvoid main(String[] args)
throws IOException
{
HSSFWorkbook wb = new HSSFWorkbook();//建立新HSSFWorkbook对象
HSSFSheet sheet = wb.createSheet("new sheet");//建立新的sheet对象
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short)0);//建立新行
// Create a cell and put a value in it.
HSSFCell cell = row.createCell((short)0);//建立新cell
cell.setCellValue(1);//设置cell的整数类型的值
// Or do it on one line.
row.createCell((short)1).setCellValue(1.2);//设置cell浮点类型的值
row.createCell((short)2).setCellValue("test");//设置cell字符类型的值
row.createCell((short)3).setCellValue(true);//设置cell布尔类型的值
HSSFCellStyle cellStyle = wb.createCellStyle();//建立新的cell样式
cellStyle.setDataFormat(HSSFDataFormat.getFormat("m/d/yy h:mm"));//设置cell样式为定制的日期格式
HSSFCell dCell =row.createCell((short)4);
dCell.setCellValue(new Date());//设置cell为日期类型的值
dCell.setCellStyle(cellStyle); //设置该cell日期的显示格式
HSSFCell csCell =row.createCell((short)5);
csCell.setEncoding(HSSFCell.ENCODING_UTF_16);//设置cell编码解决中文高位字节截断
csCell.setCellValue("中文测试_Chinese Words Test");//设置中西文结合字符串
row.createCell((short)6).setCellType(HSSFCell.CELL_TYPE_ERROR);//建立错误cell
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
}
}

更改数据:

package poi.excel;

import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFCell;

import java.io.*;
import java.util.Date;
import java.sql.Timestamp;
import java.text.DecimalFormat;

/**
 * Created by IntelliJ IDEA.
 * User: admin
 * Date: 2011-10-10
 * Time: 16:10:29
 * To change this template use File | Settings | File Templates.
 */
public class UpdateExcel2003 {

    /**
     * 只是一个demo，这里假设修改的值是String类型
     * @param exlFile
     * @param sheetIndex
     * @param col
     * @param row
     * @param value
     * @throws Exception
     */
    public static void updateExcel(File exlFile,int sheetIndex,int col,int row,String value)throws Exception{
        FileInputStream fis=new FileInputStream(exlFile);
        HSSFWorkbook workbook=new HSSFWorkbook(fis);
//        workbook.
        HSSFSheet sheet=workbook.getSheetAt(sheetIndex);

        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
    }


    private String getCellValue(HSSFCell cell) {
        String cellValue = "";
        DecimalFormat df = new DecimalFormat("#");
        switch (cell.getCellType()) {
            case XSSFCell.CELL_TYPE_STRING:
                cellValue = cell.getRichStringCellValue().getString().trim();
                break;
            case XSSFCell.CELL_TYPE_NUMERIC:
                cellValue = df.format(cell.getNumericCellValue()).toString();
                break;
            case XSSFCell.CELL_TYPE_BOOLEAN:
                cellValue = String.valueOf(cell.getBooleanCellValue()).trim();
                break;
            case XSSFCell.CELL_TYPE_FORMULA:
                cellValue = cell.getCellFormula();
                break;
            default:
                cellValue = "";
        }
        return cellValue;
    }

    /**
	 * @param args
	 */
	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("resources/excel/stuInfo.xls");

         //下面尝试更改第一行第一列的单元格的值
          UpdateExcel2003.updateExcel(file,0,0,0,"更改测试");
	}
}