JAVA POI 读取 excel

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

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;

/**
 * @author AaronLee([email protected],hua yun online Co. ,ltd)
 *
 * @version v1.0
 */
public class ExcelRead {
	/** 总行数 */
	private int totalRows = 0;
	/** 总列数 */
	private int totalCells = 0;
	/** 错误信息 */
	private String errorInfo;

	public int getTotalRows() {
		return totalRows;
	}

	public int getTotalCells() {
		return totalCells;
	}

	public String getErrorInfo() {
		return errorInfo;
	}

	public boolean validateExcel(String filePath) {
		if (filePath == null || !(isExcel2003(filePath) || isExcel2007(filePath))) {
			errorInfo = "文件名不是excel格式";
			return false;
		}
		File file = new File(filePath);
		if (file == null || !file.exists()) {
			errorInfo = "文件不存在";
			return false;
		}
		return true;
	}
	public List<List<String>> read(String filePath,String charsetName) {
		List<List<String>> dataLst = new ArrayList<List<String>>();
		InputStreamReader reader = null;
		try {
			/** 验证文件是否合法 */
			if (!validateExcel(filePath)) {
				return null;
			}
			/** 判断文件的类型，是2003还是2007 */
			boolean isExcel2003 = true;
			if (isExcel2007(filePath)) {
				isExcel2003 = false;
			}
			File file = new File(filePath);
			InputStream is = new FileInputStream(file);
			reader = new InputStreamReader(is, charsetName);
			dataLst = read(is, isExcel2003);
			is.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			if (reader != null) {
				try {
					reader.close();
				} catch (IOException e) {
					reader = null;
					e.printStackTrace();
				}
			}
		}
		return dataLst;
	}
	public List<List<String>> read(String filePath) {
		return read(filePath,"UTF-8");
	}

	public List<List<String>> read(InputStream inputStream, boolean isExcel2003) {
		List<List<String>> dataLst = null;
		try {
			Workbook wb = null;
			if (isExcel2003) {
				wb = new HSSFWorkbook(inputStream);
			} else {
				wb = new XSSFWorkbook(inputStream);
			}
			dataLst = read(wb);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return dataLst;
	}

	private List<List<String>> read(Workbook wb) {
		List<List<String>> dataLst = new ArrayList<List<String>>();
		Sheet sheet = wb.getSheetAt(0);
		this.totalRows = sheet.getPhysicalNumberOfRows();
		if (this.totalRows >= 1 && sheet.getRow(0) != null) {
			this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
		}
		for (int r = 0; r < this.totalRows; r++) {
			Row row = sheet.getRow(r);
			if (row == null) {
				continue;
			}
			List<String> rowLst = new ArrayList<String>();
			for (int c = 0; c < this.getTotalCells(); c++) {
				Cell cell = row.getCell(c);
				String cellValue = "";
				if (null != cell) {
					// 以下是判断数据的类型
					switch (cell.getCellTypeEnum()) {
					case NUMERIC: // 数字
						cellValue = String.valueOf(cell.getNumericCellValue());
						break;
					case STRING: // 字符串
						cellValue = cell.getStringCellValue();
						break;
					case BOOLEAN: // Boolean
						cellValue = String.valueOf(cell.getBooleanCellValue());
						break;
					case FORMULA: // 公式
						cellValue = String.valueOf(cell.getCellFormula());
						break;
					case BLANK: // 空值
						cellValue = "";
						break;
					case ERROR: // 故障
						cellValue = "非法字符";
						break;
					default:
						cellValue = "未知类型";
						break;
					}
				}
				rowLst.add(cellValue);
			}
			dataLst.add(rowLst);
		}
		return dataLst;
	}

	public boolean isExcel2003(String filePath) {
		return filePath.matches("^.+\\.(?i)(xls)$");
	}

	public boolean isExcel2007(String filePath) {
		return filePath.matches("^.+\\.(?i)(xlsx)$");
	}
}

Maven引入包：

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
			<version>3.17</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml</artifactId>
			<version>3.17</version>
		</dependency>