java工具类之Excel文件导入、读取数据（支持xls、和xlsx）

所需的jar包：

poi的jar包尽量保持一致，不然会报版本不一致的错误

下面是代码：

package ReadExcel;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.*;
import java.util.List;
import java.util.Properties;

/**
 * @Author:青松
 * @Desc:
 * @Date: Create in 13:56 2018/5/26
 * @Modified by :
 */
public class ReadExcel_xlsx {
    private static int count = 0;
    private static String OutPictruePath = null;

    public static void main(String[] args) {
        getUrlByXlsx(getPath());
    }

    /**
     * 从配置文件中读取出Excel文件的路径
     *
     * @return
     */
    public static String getPath() {
        String filePath = null;
        InputStream in = null;
        try {
            Properties properties = new Properties();
            in = ReadExcelUtil.class.getClassLoader().getResourceAsStream("util.properties");
            properties.load(in);
            filePath = properties.getProperty("ExcelFilepath");
            OutPictruePath = properties.getProperty("OutPicturePath");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (in != null) in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return filePath;
    }

    /**
     * 读取excel文件
     *
     * @param filePath excel文件路径
     */
    public static void getUrlByXlsx(String filePath) {
        InputStream in = null;
        Row row = null;
        int rownum = 0;
        int colnum = 0;
        String url = null;
        Workbook workbook = null;
        try {
            in = new FileInputStream(new File(filePath));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        if (in != null && (workbook = getWorkbook(in, filePath)) != null) {
            int sheet_size = workbook.getNumberOfSheets();
            for (int i = 0; i < sheet_size; i++) {
                Sheet sheet = workbook.getSheetAt(i);
                rownum = sheet.getPhysicalNumberOfRows();//行数
                row = sheet.getRow(0);//获取第一行，读取出一共有几列数据
                colnum = row.getPhysicalNumberOfCells();//列数
                for (int j = 1; j < rownum; j++) {
                    row = sheet.getRow(j);
                    for (int k = 0; k < colnum; k++) {
//                           Cell cell=row.getCell(k);//获取单元
//                           String a=cell.getRichStringCellValue().toString();
//                           url=cell.getStringCellValue();
//                           System.out.println("a:"+a+",\n url:"+url);
                        url = (String) getCellFormatValue(row.getCell(k));
                        System.out.println("url:" + url);
                    }
                }
            }
        }
    }

    /**
     * 判断单元格的格式（string、int、date...）
     *
     * @param cell 单元格
     * @return
     */
    public static Object getCellFormatValue(Cell cell) {
        Object cellValue = null;
        if (cell != null) {
            //判断cell类型
            switch (cell.getCellType()) {
                case Cell.CELL_TYPE_NUMERIC: {
                    cellValue = String.valueOf(cell.getNumericCellValue());
                    break;
                }
                case Cell.CELL_TYPE_FORMULA: {
                    //判断cell是否为日期格式
                    if (DateUtil.isCellDateFormatted(cell)) {
                        //转换为日期格式YYYY-mm-dd
                        cellValue = cell.getDateCellValue();
                    } else {
                        //数字
                        cellValue = String.valueOf(cell.getNumericCellValue());
                    }
                    break;
                }
                case Cell.CELL_TYPE_STRING: {
                    cellValue = cell.getRichStringCellValue().getString();
                    break;
                }
                default:
                    cellValue = "";
            }
        } else {
            cellValue = "";
        }
        return cellValue;
    }

    /**
     * 判断是xls文件还是xlsx文件，并返回相对应的workbook
     *
     * @param in
     * @param filePath
     * @return
     */
    public static Workbook getWorkbook(InputStream in, String filePath) {
        if (filePath != null) {
            try {
                char[] utlChar = filePath.toCharArray();
                char end = utlChar[utlChar.length - 1];
                if (end == 's') {
                    return new HSSFWorkbook(in);
                } else if (end == 'x') {
                    return new XSSFWorkbook(in);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}