Apache POI解析excel文件

这里需要用到poi.jar和poi-ooxml.jar  没有的可以去http://mvnrepository.com/下载

import org.apache.poi.POIXMLDocument;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * Created by Donge on 2017/1/3.
 */
public class ReadExcel {

    static private Workbook wb;
    static private Sheet sheet;
    static private Row row;

    /**
     * 读取 Excel 标题
     * @param fileName
     * @return
     */
    public static String[] readExcelTitle(String fileName) {
        try {
            wb = createWorkbook(new FileInputStream(fileName));
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InvalidFormatException e) {
            e.printStackTrace();
        }
        sheet = wb.getSheetAt(0);
        row = sheet.getRow(0);// 获取第一行（约定第一行是标题行）
        int colNum = row.getLastCellNum();// 获取行的列数
        String[] titles = new String[colNum];
        for (int i = 0; i < titles.length; i++) {
            titles[i] = getCellFormatValue(row.getCell(i));
        }
        return titles;
    }

    /**
     * 读取 Excel 内容
     * @param fileName
     * @return
     */
    public static List<Map<String, String>> readExcelContent(String fileName) {
        List<Map<String, String>> list = new ArrayList<>();
        Map<String, String> content;
        try {
            wb = createWorkbook(new FileInputStream(fileName));
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InvalidFormatException e) {
            e.printStackTrace();
        }
        sheet = wb.getSheetAt(0);
        int rowNum = sheet.getLastRowNum()+1;// 得到总行数
        row = sheet.getRow(0);
        int colNum = row.getLastCellNum();// 得到总列数
        String titles[] = readExcelTitle(fileName);
        // 正文内容应该从第二行开始,第一行为表头的标题
        for (int i = 1; i < rowNum; i++) {
            int j = 0;
            row = sheet.getRow(i);
            content = new LinkedHashMap<>();
            do {
                content.put(titles[j], getCellFormatValue(row.getCell(j)).trim());
                j++;
            } while (j < colNum);
            list.add(content);
        }
        return list;
    }

    /**
     * 根据Cell类型设置数据
     * @param cell
     * @return
     */
    private static String getCellFormatValue(Cell 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 Cell.CELL_TYPE_NUMERIC:
                case Cell.CELL_TYPE_FORMULA: {
                    // 判断当前的cell是否为Date
                    if (HSSFDateUtil.isCellDateFormatted(cell)) {
                        Date date = cell.getDateCellValue();
                        cellValue = new SimpleDateFormat("yyyy-MM-dd").format(date);// 时间格式化显示：2012-12-31
                    } else {
                        // 如果是纯数字取得当前Cell的数值
                        cellValue = String.valueOf(cell.getNumericCellValue());
                    }
                    break;
                }
                // 如果当前Cell的Type为STRIN
                case Cell.CELL_TYPE_STRING:
                    cellValue = cell.getRichStringCellValue().getString();
                    break;
                default:
                    // 默认的Cell值
                    cellValue = " ";
            }
        }
        return cellValue;

    }

    /**
     * 创建 Workbook
     * @param is
     * @return
     * @throws IOException
     * @throws InvalidFormatException
     */
    public static Workbook createWorkbook(InputStream is) throws IOException,InvalidFormatException {
        if (!is.markSupported()) {
            is = new PushbackInputStream(is, 8);
        }
        if (POIFSFileSystem.hasPOIFSHeader(is)) {
            return new HSSFWorkbook(is);
        }
        if (POIXMLDocument.hasOOXMLHeader(is)) {
            return new XSSFWorkbook(OPCPackage.open(is));
        }
        throw new IllegalArgumentException("POI解析不了您当前的Excel版本");
    }

    /**
     * 测试
     * @param args
     */
    public static void main(String args[]) {
        String filePath = "D:\\Test.xls";
        List<Map<String, String>> list = readExcelContent(filePath);
        Map<String, String> map;
        for (int i = 0; i < list.size(); i++) {
            map = list.get(i);
            System.out.println("**************THE START OF ROW("+(i+1)+")**************");
            for (String key : map.keySet()) {
                System.out.println(key + " : " + map.get(key));
            }
        }
    }
}