POI读取Excel指定数据

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1.代码展示 

package com.XXXX.util;

import java.io.FileInputStream;
import java.io.IOException;
import java.text.DecimalFormat;
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.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.DateUtil;

/**
 * 读取指定路径指定表工具类
 * 使用完需在调用位置：ReadExcelDataUtil.strLists.clear(); 将集合清空
 * 以实现不重启项目一次读取多个Excel表格
 * @author TL-thinkive-48
 *
 */
public class ReadExcelDataUtil {

	private static String val = null;
	private static SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
	private static DecimalFormat df = new DecimalFormat("0");
	public static List<List<String>> strLists = new ArrayList<List<String>>();
	private static HSSFWorkbook wb;

	/**
	 * 列数由形参传入，解决列情况： X,X,,X读取列数为3
	 * 
	 * @param filePath
	 * @param colNum
	 *            表的列数
	 * @param index
	 *            表的序号-部分表的字段采用vlookup关联，需上传多张表格
	 * @return
	 */
	public static List<List<String>> readExcelData(String filePath, int colNum,
			int index) {
		FileInputStream file = null;
		POIFSFileSystem ts = null;
		try {
			file = new FileInputStream(filePath);
			ts = new POIFSFileSystem(file);
			wb = new HSSFWorkbook(ts);
			HSSFSheet sheet = wb.getSheetAt(index); // 获取表
			int rowNum = sheet.getPhysicalNumberOfRows(); // 获取行数

			HSSFRow row = null;

			for (int i = 1; i < rowNum; i++) { 

				List<String> list = new ArrayList<String>();
				row = sheet.getRow(i);

				for (int j = 0; j < colNum; j++) {
					HSSFCell cell = row.getCell(j);
					list.add(getXcellVal(cell));
				}
				strLists.add(list);
			}
			return strLists;
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				file.close();
				wb.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return null;
	}

	/**
	 * 获取单元格的值
	 * 
	 * @param cell
	 * @return String
	 */
	public static String getXcellVal(HSSFCell cell) {

		if (null == cell) {
			return "";
		}
		switch (cell.getCellType()) {
		case HSSFCell.CELL_TYPE_NUMERIC:
			if (DateUtil.isCellDateFormatted(cell)) {
				val = fmt.format(cell.getDateCellValue()); // 日期型
			} else {
				val = df.format(cell.getNumericCellValue()); // 数字型
			}
			break;
		case HSSFCell.CELL_TYPE_STRING: // 文本类型
			val = cell.getStringCellValue();
			break;
		case HSSFCell.CELL_TYPE_FORMULA: // 公式
			try {
				val = String.valueOf(cell.getStringCellValue());
			} catch (IllegalStateException e) {
				val = String.valueOf(cell.getNumericCellValue());
			}
			break;
		case HSSFCell.CELL_TYPE_BLANK: // 空
			val = cell.getStringCellValue();
			break;
		case HSSFCell.CELL_TYPE_BOOLEAN:// 布尔
			val = String.valueOf(cell.getBooleanCellValue());
			break;
		case HSSFCell.CELL_TYPE_ERROR:// 错误
			val = "ERROR..CHECK DATA";
			break;
		default:
			val = cell.getRichStringCellValue() == null ? null : cell
					.getRichStringCellValue().toString();
		}

		return val;
	}
}

2.实例调用

List<List<String>> dataList = ReadExcelUtil.readExcelData("filePath",要读取的列数,要读取的第几张表);

以下表为例：

则，调用如下

List<List<String>> dataList = ReadExcelUtil.readExcelData("filePath",2,0);