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

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
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;

/**
 * 
 * Title: ExcelReader<br>
 * Description: 可以读取xls,xlsx等文件<br>
 * Copyright @ 2012~2016 xiaour.github.com<span style="font-size: 1em;"> .All rights reserved.<br></span>
 * @author  小鱼儿
 * @createDate 2016年8月23日
 * @version v1.0
 */
public class ExcelReader {
    private POIFSFileSystem fs;
    private HSSFWorkbook wb;
    private HSSFSheet sheet;
    private HSSFRow row;
    private static Logger logger = LogManager.getLogger(ExcelReader.class);

    private String fileFullPath;
    
    private int sheetNo;
    
    
    
    public ExcelReader(String fileFullPath, int sheetNo) {
        super();
        this.fileFullPath = fileFullPath;
        this.sheetNo = sheetNo;
    }

    /**
     * 读取Excel数据内容
     * @param InputStream 
     * @param sheetNo sheet 页号
     * @return Map 包含单元格数据内容的Map对象
     */
    public List<Map<String,Object>> readExcel() {
        logger.info("开始解析xls...");
        sheetNo--;//从1开始及从0开始
        InputStream is = null;
        try {
            is = new FileInputStream(fileFullPath);
        } catch (FileNotFoundException e1) {
            logger.error(e1);
        }
        Map<String,Object> dataMap = null;
        List<Map<String,Object>> dataList= new ArrayList<>();
        String value = "";
         try {
             fs = new POIFSFileSystem(is);
             wb = new HSSFWorkbook(fs);
         } catch (IOException e) {
             logger.error(e);
         }
         sheet = wb.getSheetAt(sheetNo);
         row = sheet.getRow(0);
         // 标题总列数
         int colNum = row.getPhysicalNumberOfCells();
         String[] keyArray = new String[colNum];
         for (int i = 0; i < colNum; i++) {
             keyArray[i] = getCellFormatValue(row.getCell((short) i));
         }
        int rowNum = sheet.getLastRowNum();
        // 正文内容应该从第二行开始,第一行为表头的标题
        for (int i = 2; i <= rowNum; i++) {
            dataMap= new HashMap<>();
            row = sheet.getRow(i);
            if(row!=null){
                int j = 0;
                while (j < colNum) {
                    //这里把列循环到Map
                    if(row.getCell((short) j)!=null){
                    value = getCellFormatValue(row.getCell((short) j)).trim();
                    dataMap.put(keyArray[j],value);
                    }
                    j++;
                }
                value = "";
                dataList.add(dataMap);
            }
        }
        logger.info("解析xls完成...");
        try {
            if(is!=null)
            is.close();
        } catch (IOException e) {
            logger.error(e.toString());
        }
        return dataList;
    }

    /**
     * 根据HSSFCell类型设置数据
     * @param cell
     * @return
     */
    private String getCellFormatValue(HSSFCell cell) {
        String cellvalue = "";
        if (cell != null) {
            // 判断当前Cell的Type
            switch (cell.getCellType()) {
            // 如果当前Cell的Type为NUMERIC
            case HSSFCell.CELL_TYPE_NUMERIC:
            case HSSFCell.CELL_TYPE_FORMULA: {
                // 判断当前的cell是否为Date
                if (HSSFDateUtil.isCellDateFormatted(cell)) {
                    Date date = cell.getDateCellValue();
                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                    cellvalue = sdf.format(date);
                }
                // 如果是纯数字
                else {
                    // 取得当前Cell的数值
                    DecimalFormat df = new DecimalFormat("0");  
                    String dfStr = df.format(cell.getNumericCellValue()); 
                    cellvalue = dfStr;
                }
                break;
            }
            // 如果当前Cell的Type为STRIN
            case HSSFCell.CELL_TYPE_STRING:
                // 取得当前的Cell字符串
                cellvalue = cell.getRichStringCellValue().getString();
                break;
            // 默认的Cell值
            default:
                cellvalue = " ";
            }
        } else {
            cellvalue = "";
        }
        return cellvalue;

    }

    public static void main(String[] args) {
            List<Map<String, Object>> dataList;
            // 对读取Excel表格标题测试
            ExcelReader excelReader = new ExcelReader("D:\\okcoin-2016-08-3XZS.xls",1);
            dataList = excelReader.readExcel();
            for(Map<String,Object> theMap:dataList){
                System.out.println(theMap);
            }
    }
}