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【Java】读取Excel并转化为List
作者:雅玉 / 发布于2018/3/22/ 701
读取Excel并转化为List
import java.io.InputStream;
import java.util.*;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
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;

public class ExcelUtils {
	//读取两种格式的Excel内容
	/**
	 * @description: 读取两种格式的Excel
	 * @param stream 输入流
	 * @param extString excel后缀
	 * @param columns 列名称
	 * @author: baipengfei
	 * @since: 2018年3月21日 下午12:01:44
	 */
	public static List<Map<String, String>> readExcelByStream(InputStream stream, String extString, String[] columns) throws Exception {
		Workbook wb = getExcelWb(stream, extString);
		List<Map<String, String>> list = null;
		String cellData = null;
		if(wb != null){
			//用来存放表中数据
			list = new ArrayList<Map<String,String>>();
			//获取第一个sheet
			Sheet sheet = wb.getSheetAt(0);
			//获取最大行数
			int rownum = sheet.getPhysicalNumberOfRows();
			//获取第一行
			Row row = sheet.getRow(0);
			//获取最大列数
			int column = row.getPhysicalNumberOfCells();
			for(int i = 1; i < rownum; i++){
				Map<String, String> map = new LinkedHashMap<String, String>();
				row = sheet.getRow(i);
				if(row != null){
					for(int j = 0; j < column; j++){
						cellData = String.valueOf(getCellFormatValue(row.getCell(j)));
						map.put(columns[j], cellData);
					}
				}else {
					break;
				}
				list.add(map);
			}
			
		}
		return list;
	}
	
	//获取Workbook对象
	public static Workbook getExcelWb(InputStream stream, String extString) throws Exception {
		Workbook wb = null;
		if(stream == null){
			return null;
		}
		
		if(".xls".equals(extString)){
			return wb = new HSSFWorkbook(stream);
		}else if(".xlsx".equals(extString)){
			return wb = new XSSFWorkbook(stream);
		}else{
			return wb = null;
		}

	}
	
	//获取单元格值
	public static Object getCellFormatValue(Cell cell) {
		Object cellValue = null;
		if(cell != null){
			switch (cell.getCellType()) {
			case Cell.CELL_TYPE_NUMERIC:{
				cellValue = String.valueOf(cell.getNumericCellValue());
				break;
			}
			
			case Cell.CELL_TYPE_FORMULA:{
				if(DateUtil.isCellDateFormatted(cell)){
					cellValue = cell.getDateCellValue();
				}else {
					cellValue = String.valueOf(cell.getNumericCellValue());
				}
				break;
			}
			
			case Cell.CELL_TYPE_STRING:{
				cellValue = cell.getRichStringCellValue();
				break;
			}
			
			default:
				cellValue = "";
				
			}
		}else {
			cellValue = "";
		}
		return cellValue;
	}
}
//需引入poi-version.jar和poi-ooxml-version.jar
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