Java读取excel

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.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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 rex {

    public static void main(String[] args) throws Exception {
        Map<Object, Object> map = new LinkedHashMap<Object, Object>();
        String s = "C:\\Users\\Lenovo\\Desktop\\文档\\test.xls";
        File file = new File(s);
        String[][] result = getData(file, 1);
        int rowLength = result.length;
        System.out.println("..." + rowLength);
        for (int i = 0; i < rowLength; i++) {
            map.put(result[i][0], new String[] { result[i][1], result[i][2] });
            System.out.println(result[i][0] + result[i][1] + result[i][2]);
        }
//        net.sf.json.JSONObject jo = net.sf.json.JSONObject.fromObject(map);
//        Map<Object, Object> m = jo;
//        for (Entry<Object, Object> mp : m.entrySet()) {
//            System.out.println(mp.getKey() + ":" + mp.getValue().toString());
//        }

    }

    /**
     * 
     * 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<String[]> result = new ArrayList<String[]>();
        int rowSize = 0;
        BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
//           POIFSFileSystem fs = new POIFSFileSystem(in);
        XSSFWorkbook wb = new XSSFWorkbook(in);
        XSSFCell cell = null;
        for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {
            XSSFSheet st = wb.getSheetAt(sheetIndex);
            // 第一行为标题，不取
            for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) {
                XSSFRow 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);
    }

}