java Excel操作类

[java]代码库

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
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 ExcelOpearate {

    /**
     * 读取Excel的内容，第一维数组储存的是一行中格列的值，二维数组中储存的是多少行
     *
     * @param file
     *            读取数据源Excel
     * @param ignoreRows
     *            读取数据忽略的行数，
     * @return 读出的Excel中数据的内容
     * @throws IOException
     */
    public static String[][] getData(File file, int ignoreRows)
    throws IOException {
        List<String[]> result = new ArrayList<String[]>();
        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);
            // 第一行为标题不读取
            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：一定要設成這個。否則可能會出現亂碼
                        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());
                                DecimalFormat df = new DecimalFormat("#");//解决读取长数据为科学计数的问题
                                value = String.valueOf(df.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:
                            value = "";
                            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) {
        // TODO Auto-generated method stub
        if (str == "") {
            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);
    }
}