原文地址：
首先下载poi.jar，将jar包放到项目下，并将需要读取的excel文件(本例子是.xls格式的excel文件)放入根目录即可。
import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.text.DecimalFormat;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Arrays;import java.util.Date;import java.util.List;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFDateUtil;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.poifs.filesystem.POIFSFileSystem;public class ExcelOperate{ public static void main(String[] args) throws Exception { File file = new File("ExcelDemo.xls");//其他格式的excel不可以 String[][] result = getData(file, 1); int rowLength = result.length; for (int i = 0; i < rowLength; i++) { for (int j = 0; j < result[i].length; j++) { System.out.print(result[i][j] + "\t\t"); } System.out.println(); } } /** * * 读取Excel的内容，第一维数组存储的是一行中格列的值，二维数组存储的是多少个行 * @param file 读取数据的源Excel * @param ignoreRows 读取数据忽略的行数，比喻行头不需要读入 忽略的行数为1 * @return 读出的Excel中数据的内容 * @throws FileNotFoundException * @throws IOException */ public static String[][] getData(File file, int ignoreRows) throws FileNotFoundException, IOException { List result = new ArrayList(); int rowSize = 0; BufferedInputStream in = new BufferedInputStream(new FileInputStream( file)); // 打开HSSFWorkbook POIFSFileSystem fs = new POIFSFileSystem(in); HSSFWorkbook wb = new HSSFWorkbook(fs); HSSFCell cell = null; for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) { HSSFSheet st = wb.getSheetAt(sheetIndex); // 第一行为标题，不取 for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) { HSSFRow row = st.getRow(rowIndex); if (row == null) { continue; } int tempRowSize = row.getLastCellNum() + 1; if (tempRowSize > rowSize) { rowSize = tempRowSize; } String[] values = new String[rowSize]; Arrays.fill(values, ""); boolean hasValue = false; for (short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) { String value = ""; cell = row.getCell(columnIndex); if (cell != null) { // 注意：一定要设成这个，否则可能会出现乱码 cell.setEncoding(HSSFCell.ENCODING_UTF_16); switch (cell.getCellType()) { case HSSFCell.CELL_TYPE_STRING: value = cell.getStringCellValue(); break; case HSSFCell.CELL_TYPE_NUMERIC: if (HSSFDateUtil.isCellDateFormatted(cell)) { Date date = cell.getDateCellValue(); if (date != null) { value = new SimpleDateFormat("yyyy-MM-dd").format(date); } else { value = ""; } } else { value = new DecimalFormat("0").format(cell.getNumericCellValue()); } break; case HSSFCell.CELL_TYPE_FORMULA: // 导入时如果为公式生成的数据则无值 if (!cell.getStringCellValue().equals("")) { value = cell.getStringCellValue(); } else { value = cell.getNumericCellValue() + ""; } break; case HSSFCell.CELL_TYPE_BLANK: break; case HSSFCell.CELL_TYPE_ERROR: value = ""; break; case HSSFCell.CELL_TYPE_BOOLEAN: value = (cell.getBooleanCellValue() == true ? "Y" : "N"); break; default: value = ""; } } if (columnIndex == 0 && value.trim().equals("")) { break; } values[columnIndex] = rightTrim(value); hasValue = true; } if (hasValue) { result.add(values); } } } in.close(); String[][] returnArray = new String[result.size()][rowSize]; for (int i = 0; i < returnArray.length; i++) { returnArray[i] = (String[]) result.get(i); } return returnArray; } /** * 去掉字符串右边的空格 * @param str 要处理的字符串 * @return 处理后的字符串 */ public static String rightTrim(String str) { if (str == null) { return ""; } int length = str.length(); for (int i = length - 1; i >= 0; i--) { if (str.charAt(i) != 0x20) { break; } length--; } return str.substring(0, length); }}