Java POI读取excel的例子

此例子支持xls、xlsx格式（即：2003、2010），使用poi的jar版本是3.8。

导入excel内容：

导出excel模板：

1、TextExcel.java

<span style="font-size:12px;">package com.excel;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

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.ss.usermodel.WorkbookFactory;

import com.yfli.util.User;

public class TestExcel {
	public static void main(String[] args) throws Exception {
		//导入
		importExcel("F:\\xls\\test_import.xls");
		
		//导出
		File modelFile = new File("F:\\xls\\test_export_model.xls");
		Calendar now = Calendar.getInstance();
		String dbfFileName = "sfData_" + now.get(Calendar.YEAR)
				+ (now.get(Calendar.MONTH) + 1) + ""
				+ now.get(Calendar.DAY_OF_MONTH)
				+ now.get(Calendar.HOUR_OF_DAY) + now.get(Calendar.MINUTE)
				+ now.get(Calendar.MINUTE) + ".xls";

		String directoryPath = "F:\\xls\\";
		String filePath = "F:\\xls\\" + dbfFileName;
		File directory = new File(directoryPath);// 目标文件夹
		if (!directory.exists()) {
			directory.mkdirs();// 创建目标目录
		}
		File outputFile = new File(filePath);
		if (!outputFile.exists() || outputFile.isDirectory()) {
			outputFile.createNewFile();
		}
		exportExcelContent(modelFile, outputFile, getUserList());
	}

	public static void importExcel(String file) {
		try {
			FileInputStream fis = new FileInputStream(file);
			Workbook wb = WorkbookFactory.create(fis);

			int sheetCount = wb.getNumberOfSheets(); // 得到excel工作表的总数
			for (int n = 0; n < sheetCount; n++) {
				Sheet sheet = wb.getSheetAt(n); // 得到Excel工作表对象
				int rowNum = sheet.getPhysicalNumberOfRows();// 得到行的总数
				if (rowNum == 0) {
					continue;
				}
				String[] title = readExcelHead(sheet);
				List<User> users = readExcelContent(sheet, title);
				for (User user : users) {
					System.out.println(user.getName() + "---" + user.getSex()
							+ "---" + user.getBirthday() + "---"
							+ user.getAge());
				}
			}
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	/**
	 * 读取Excel表头
	 */
	public static String[] readExcelHead(Sheet sheet) {
		Row row = sheet.getRow(0);
		int colNum = row.getPhysicalNumberOfCells(); // 标题总列数
		String[] title = new String[colNum];
		for (int i = 0; i < colNum; i++) {
			title[i] = getStringCellValue(row.getCell(i));
		}
		return title;
	}

	public static List<User> readExcelContent(Sheet sheet, String[] title)
			throws Exception {
		int rowNum = sheet.getPhysicalNumberOfRows();// 得到行的总数
		Row row = sheet.getRow(0);
		int colNum = row.getPhysicalNumberOfCells(); // 标题总列数

		List<User> content = new ArrayList<User>();
		for (int i = 1; i < rowNum; i++) {
			Row rows = sheet.getRow(i);
			User user = new User();
			for (int j = 0; j < colNum; j++) {
				if (title[j].toString().equals("姓名")) {
					user.setName(getStringCellValue(rows.getCell(j)));
				}
				if (title[j].toString().equals("性别")) {
					user.setSex(getStringCellValue(rows.getCell(j)));
				}
				if (title[j].toString().equals("出生日期")) {
					user.setBirthday(getStringCellValue(rows.getCell(j)));
				}
				if (title[j].toString().equals("年龄")) {
					user.setAge(getStringCellValue(rows.getCell(j)));
				}
			}
			content.add(user);
		}
		return content;
	}

	/**
	 * 导出数据到excel中
	 * 
	 * @param outputFile
	 *            导出excel文件
	 * @param modelFile
	 *            导出excel模板（test_model.xlsx）
	 */
	public static void exportExcelContent(File modelFile, File outputFile,
			List<User> users) {
		InputStream inp = null;
		Workbook wb = null;
		try {
			inp = new FileInputStream(modelFile);
			wb = WorkbookFactory.create(inp); // 读取导出excel模板
			Sheet sheet = wb.getSheetAt(0);
			String[] title = readExcelHead(sheet);

			// 生成导出数据
			int startRow = 1;
			for (int i = 0; i < users.size(); i++) {
				User user = users.get(i);
				Row row = sheet.createRow(startRow++);
				for (int j = 0; j < title.length; j++) {
					String titleName = title[j];
					Cell cell = row.createCell(j);
					cell.setCellType(Cell.CELL_TYPE_STRING);
					if (titleName.equals("姓名")) {
						cell.setCellValue(user.getName());
					}
					if (titleName.equals("性别")) {
						cell.setCellValue(user.getSex());
					}
					if (titleName.equals("出生日期")) {
						cell.setCellValue(user.getBirthday());
					}
					if (titleName.equals("年龄")) {
						cell.setCellValue(user.getAge());
					}
				}
			}

			// 导出到文件中
			FileOutputStream fileOut = new FileOutputStream(outputFile);
			wb.write(fileOut);
			fileOut.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	/**
	 * 获取单元格数据内容为字符串类型的数据
	 * 
	 * @param cell
	 *            Excel单元格
	 * @return String 单元格数据内容
	 */
	private static String getStringCellValue(Cell cell) {
		String strCell = "";
		switch (cell.getCellType()) {
		case Cell.CELL_TYPE_STRING:
			strCell = cell.getStringCellValue();
			break;
		case Cell.CELL_TYPE_NUMERIC:
			if(DateUtil.isCellDateFormatted(cell)) {
                              strCell = sdf.format(cell.getDateCellValue());
                        }else {
                              strCell = String.valueOf(cell.getNumericCellValue());
                        }
			break;
		case Cell.CELL_TYPE_BOOLEAN:
			strCell = String.valueOf(cell.getBooleanCellValue());
			break;
		case Cell.CELL_TYPE_BLANK:
			strCell = "";
			break;
		case Cell.CELL_TYPE_FORMULA:
			strCell = String.valueOf(cell.getNumericCellValue());
			break;
		default:
			strCell = "";
			break;
		}
		if (strCell.equals("") || strCell == null) {
			return "";
		}
		if (cell == null) {
			return "";
		}
		return strCell;
	}

	private static List<User> getUserList() {
		List<User> users = new ArrayList<User>();
		User user = new User();
		user.setName("张三");
		user.setSex("男");
		user.setBirthday("2013-12-01");
		user.setAge("22");
		users.add(user);

		user = new User();
		user.setName("李四");
		user.setSex("男");
		user.setBirthday("2013-12-02");
		user.setAge("23");
		users.add(user);
		return users;
	}
}
</span>

2、User.java

<span style="font-size:12px;">package com.yfli.util;

public class User {
	public String name;
	public String sex;
	public String birthday;
	public String age;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public String getBirthday() {
		return birthday;
	}

	public void setBirthday(String birthday) {
		this.birthday = birthday;
	}

	public String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}

}
</span>

附：单元格数据格式