java使用poi操作excel表

excel表的后缀分为xls和xlsx，下文中都有提到怎么遍历：

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
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;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import com.alibaba.fastjson.JSON;
import com.baidu.aip.run.entity.Shieldkw;
import com.baidu.aip.run.entity.GaShieldkw;

/**
 * 用于将关键字数据导入数据库
 * @author zyl
 * @date 2019年6月5日
 */
public class GetExcel {
	public static void main(String[] args) throws Exception {
		String excel1 = "D:\\QQfile\\1154929934\\FileRecv\\屏蔽关键词2019-05-05 (1).xlsx";
		String excel2 = "D:\\QQfile\\1154929934\\FileRecv\\新建文件夹\\公安部关键词\\公安部关键词\\搜索型关键词.xls";
		InputStream is = new FileInputStream(excel1);
		String[] split = excel1.split("\\.");
		if(split[1].equals("xlsx")) {
			System.out.println("您已进入XSSFWorkbook类型方法...");
			List<List<String>> resultList = getXSSFWorkbook(is,3);
			List<Shieldkw> intoDataExcel1 = intoDataExcel1(resultList);
			System.out.println("最终组装的数据为："+JSON.toJSONString(intoDataExcel1));
		}else {
			System.out.println("您已进入HSSFWorkbook类型方法...");
			List<List<String>> list = getHSSFWorkbook(is);
			List<GaShieldkw> intoDataExcel2 = intoDataExcel2(list);
			System.out.println(JSON.toJSONString(intoDataExcel2));
		}
	}
	
	public static List<List<String>> getHSSFWorkbook(InputStream is) throws IOException {
		// HSSFWorkbook 标识整个excel
        HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);
        List<List<String>> result = new ArrayList<List<String>>();
        int size = hssfWorkbook.getNumberOfSheets();
        // 循环每一页，并处理当前循环页
        for (int numSheet = 0; numSheet < size; numSheet++) {
            // HSSFSheet 标识某一页
            HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
            if (hssfSheet == null) {
                continue;
            }
            // 处理当前页，循环读取每一行
            for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
                // HSSFRow表示行
                HSSFRow hssfRow = hssfSheet.getRow(rowNum);
                int minColIx = hssfRow.getFirstCellNum();
                int maxColIx = hssfRow.getLastCellNum();
                List<String> rowList = new ArrayList<String>();
                // 遍历改行，获取处理每个cell元素
                for (int colIx = minColIx; colIx < maxColIx; colIx++) {
                    // HSSFCell 表示单元格
                    HSSFCell cell = hssfRow.getCell(colIx);
                    if (cell == null) {
                        continue;
                    }
                    rowList.add(cell.toString());
                }
                result.add(rowList);
            }
        }
        return result;
	}
	
	public static List<List<String>> getXSSFWorkbook(InputStream is, Integer index) throws Exception {
		// HSSFWorkbook 标识整个excel
		XSSFWorkbook hssfWorkbook = new XSSFWorkbook(is);
		List<List<String>> result = new ArrayList<List<String>>();
        // 循环每一页，并处理当前循环页
        for (int numSheet = 0; numSheet < size; numSheet++) {
            // HSSFSheet 标识某一页
            XSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
            if (hssfSheet == null) {
                continue;
            }
            // 处理当前页，循环读取每一行
            for (int rowNum = index; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
                // HSSFRow表示行
                XSSFRow hssfRow = hssfSheet.getRow(rowNum);
                int minColIx = hssfRow.getFirstCellNum();
                int maxColIx = hssfRow.getLastCellNum();
                System.out.println("进入单元格便利阶段："+minColIx);
                List<String> rowList = new ArrayList<String>();
                // 遍历该行，获取处理每个cell元素
                for (int colIx = minColIx; colIx < maxColIx; colIx++) {
                    // HSSFCell 表示单元格
                    XSSFCell cell = hssfRow.getCell(colIx);
                    if (cell == null) {
                        continue;
                    }
					rowList.add(cell.toString());
				}
				result.add(rowList);
				break;
			}
        }
        return result;
	}