Java读取Excel的内容

借助于apache的poi.jar完成Excel内容的读取

package com.util;

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("E:\\ExcelDemo.xls");

        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<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，设置的数值为1则不取
            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) {
                        // 新的poi已经删除了setEncoding方法
                        // 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);
    }
}