POI 处理Excel工具类

package com.sofly.peak3.parser.utils;


import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

/**
 * Ning.G
 * Excel处理工具类
 */
public class ExcelUtils {

    private Logger logger = Logger.getLogger(this.getClass());
    private Workbook wb;
    private Sheet sheet;
    private Row row;

    public ExcelUtils(String filepath) {
        if (filepath == null) {
            return;
        }
        String fileType = filepath.substring(filepath.lastIndexOf("."));
        try {
            InputStream