/*
 * 使用POI讀取EXCEL文件
 */
import java.io.File;
import java.io.FileInputStream;
import java.util.ArrayList;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

/**
 *
 * @author Hanbin
 */
public class ReadExcel {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)throws Exception {
        read("d://demo.xls");
    }

    public static ArrayList read(String fileName){
        ArrayList list = new ArrayList();
        String sql = "";
        try{
            File f = new File(fileName);
            FileInputStream fis = new FileInputStream(f);
            HSSFWorkbook wbs = new HSSFWorkbook(fis);
            HSSFSheet childSheet = wbs.getSheetAt(0);
            System.out.println("行數:" + childSheet.getLastRowNum());
            for(int i = 4;i<childSheet.getLastRowNum();i++){
                HSSFRow row = childSheet.getRow(i);
                System.out.println("列數:" + row.getPhysicalNumberOfCells());
                if(null != row){
                    for(int k=1;k<row.getPhysicalNumberOfCells();k++){
                        HSSFCell cell;
                        cell = row.getCell((short)k);
                       // System.out.print(getStringCellValue(cell) + "/t");
                        list.add(getStringCellValue(cell) + "/t");
                    }
                }
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return list;
    }
    /**
     * 獲取單元格數據內容為字符串類型的數據
     *
     * @param cell Excel單元格
     * @return String 單元格數據內容
     */
    private static String getStringCellValue(HSSFCell cell) {
        String strCell = "";
        switch (cell.getCellType()) {
        case HSSFCell.CELL_TYPE_STRING:
            strCell = cell.getStringCellValue();
            break;
        case HSSFCell.CELL_TYPE_NUMERIC:
            strCell = String.valueOf(cell.getNumericCellValue());
            break;
        case HSSFCell.CELL_TYPE_BOOLEAN:
            strCell = String.valueOf(cell.getBooleanCellValue());
            break;
        case HSSFCell.CELL_TYPE_BLANK:
            strCell = "";
            break;
        default:
            strCell = "";
            break;
        }
        if (strCell.equals("") || strCell == null) {
            return "";
        }
        if (cell == null) {
            return "";
        }
        return strCell;
    }
}

package edu.sjtu.erplab.poi;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

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;

/**
 * 操作Excel表格的功能類
 */
public class ExcelReader {
    private POIFSFileSystem fs;
    private HSSFWorkbook wb;
    private HSSFSheet sheet;
    private HSSFRow row;

    /**
     * 讀取Excel表格表頭的內容
     * @param InputStream
     * @return String 表頭內容的數組
     */
    public String[] readExcelTitle(InputStream is) {
        try {
            fs = new POIFSFileSystem(is);
            wb = new HSSFWorkbook(fs);
        } catch (IOException e) {
            e.printStackTrace();
        }
        sheet = wb.getSheetAt(0);
        row = sheet.getRow(0);
        // 標題總列數
        int colNum = row.getPhysicalNumberOfCells();
        System.out.println("colNum:" + colNum);
        String[] title = new String[colNum];
        for (int i = 0; i < colNum; i++) {
            //title[i] = getStringCellValue(row.getCell((short) i));
            title[i] = getCellFormatValue(row.getCell((short) i));
        }
        return title;
    }

    /**
     * 讀取Excel數據內容
     * @param InputStream
     * @return Map 包含單元格數據內容的Map對象
     */
    public Map<Integer, String> readExcelContent(InputStream is) {
        Map<Integer, String> content = new HashMap<Integer, String>();
        String str = "";
        try {
            fs = new POIFSFileSystem(is);
            wb = new HSSFWorkbook(fs);
        } catch (IOException e) {
            e.printStackTrace();
        }
        sheet = wb.getSheetAt(0);
        // 得到總行數
        int rowNum = sheet.getLastRowNum();
        row = sheet.getRow(0);
        int colNum = row.getPhysicalNumberOfCells();
        // 正文內容應該從第二行開始,第一行為表頭的標題
        for (int i = 1; i <= rowNum; i++) {
            row = sheet.getRow(i);
            int j = 0;
            while (j < colNum) {
                // 每個單元格的數據內容用"-"分割開，以后需要時用String類的replace()方法還原數據
                // 也可以將每個單元格的數據設置到一個javabean的屬性中，此時需要新建一個javabean
                // str += getStringCellValue(row.getCell((short) j)).trim() +
                // "-";
                str += getCellFormatValue(row.getCell((short) j)).trim() + "    ";
                j++;
            }
            content.put(i, str);
            str = "";
        }
        return content;
    }

    /**
     * 獲取單元格數據內容為字符串類型的數據
     *
     * @param cell Excel單元格
     * @return String 單元格數據內容
     */
    private String getStringCellValue(HSSFCell cell) {
        String strCell = "";
        switch (cell.getCellType()) {
        case HSSFCell.CELL_TYPE_STRING:
            strCell = cell.getStringCellValue();
            break;
        case HSSFCell.CELL_TYPE_NUMERIC:
            strCell = String.valueOf(cell.getNumericCellValue());
            break;
        case HSSFCell.CELL_TYPE_BOOLEAN:
            strCell = String.valueOf(cell.getBooleanCellValue());
            break;
        case HSSFCell.CELL_TYPE_BLANK:
            strCell = "";
            break;
        default:
            strCell = "";
            break;
        }
        if (strCell.equals("") || strCell == null) {
            return "";
        }
        if (cell == null) {
            return "";
        }
        return strCell;
    }

    /**
     * 獲取單元格數據內容為日期類型的數據
     *
     * @param cell
     *            Excel單元格
     * @return String 單元格數據內容
     */
    private String getDateCellValue(HSSFCell cell) {
        String result = "";
        try {
            int cellType = cell.getCellType();
            if (cellType == HSSFCell.CELL_TYPE_NUMERIC) {
                Date date = cell.getDateCellValue();
                result = (date.getYear() + 1900) + "-" + (date.getMonth() + 1)
                        + "-" + date.getDate();
            } else if (cellType == HSSFCell.CELL_TYPE_STRING) {
                String date = getStringCellValue(cell);
                result = date.replaceAll("[年月]", "-").replace("日", "").trim();
            } else if (cellType == HSSFCell.CELL_TYPE_BLANK) {
                result = "";
            }
        } catch (Exception e) {
            System.out.println("日期格式不正確!");
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 根據HSSFCell類型設置數據
     * @param cell
     * @return
     */
    private String getCellFormatValue(HSSFCell cell) {
        String cellvalue = "";
        if (cell != null) {
            // 判斷當前Cell的Type
            switch (cell.getCellType()) {
            // 如果當前Cell的Type為NUMERIC
            case HSSFCell.CELL_TYPE_NUMERIC:
            case HSSFCell.CELL_TYPE_FORMULA: {
                // 判斷當前的cell是否為Date
                if (HSSFDateUtil.isCellDateFormatted(cell)) {
                    // 如果是Date類型則，轉化為Data格式

                    //方法1：這樣子的data格式是帶時分秒的：2011-10-12 0:00:00
                    //cellvalue = cell.getDateCellValue().toLocaleString();

                    //方法2：這樣子的data格式是不帶帶時分秒的：2011-10-12
                    Date date = cell.getDateCellValue();
                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                    cellvalue = sdf.format(date);

                }
                // 如果是純數字
                else {
                    // 取得當前Cell的數值
                    cellvalue = String.valueOf(cell.getNumericCellValue());
                }
                break;
            }
            // 如果當前Cell的Type為STRIN
            case HSSFCell.CELL_TYPE_STRING:
                // 取得當前的Cell字符串
                cellvalue = cell.getRichStringCellValue().getString();
                break;
            // 默認的Cell值
            default:
                cellvalue = " ";
            }
        } else {
            cellvalue = "";
        }
        return cellvalue;

    }

    public static void main(String[] args) {
        try {
            // 對讀取Excel表格標題測試
            InputStream is = new FileInputStream("d://test2.xls");
            ExcelReader excelReader = new ExcelReader();
            String[] title = excelReader.readExcelTitle(is);
            System.out.println("獲得Excel表格的標題:");
            for (String s : title) {
                System.out.print(s + " ");
            }

            // 對讀取Excel表格內容測試
            InputStream is2 = new FileInputStream("d://test2.xls");
            Map<Integer, String> map = excelReader.readExcelContent(is2);
            System.out.println("獲得Excel表格的內容:");
            for (int i = 1; i <= map.size(); i++) {
                System.out.println(map.get(i));
            }

        } catch (FileNotFoundException e) {
            System.out.println("未找到指定路徑的文件!");
            e.printStackTrace();
        }
    }
}