java使用POI实现excel文件的读取

框架这些就不用说了,主要是POIUtil类

首先是jar包

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->  
<dependency>  
    <groupId>org.apache.poi</groupId>  
    <artifactId>poi</artifactId>  
    <version>3.14</version>  
</dependency>  
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->  
<dependency>  
    <groupId>org.apache.poi</groupId>  
    <artifactId>poi-ooxml</artifactId>  
    <version>3.14</version>  
</dependency> 

然后工具类POIUtil.java

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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 org.springframework.web.multipart.MultipartFile;

/**
 * excel读写工具类
 * 
 * @author sun.kai 2016年8月21日
 */
public class POIUtil {
	private static Logger logger = Logger.getLogger(POIUtil.class);
	private final static String xls = "xls";
	private final static String xlsx = "xlsx";

	/**
	 * 读入excel文件,解析后返回
	 * 
	 * @param file
	 * @throws IOException
	 */
	public static List<String[]> readExcel(MultipartFile file) throws IOException {
		// 检查文件
		checkFile(file);
		// 获得Workbook工作薄对象
		Workbook workbook = getWorkBook(file);
		// 创建返回对象,把每行中的值作为一个数组,所有行作为一个集合返回
		List<String[]> list = new ArrayList<String[]>();
		if (workbook != null) {
			for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
				// 获得当前sheet工作表
				Sheet sheet = workbook.getSheetAt(sheetNum);
				if (sheet == null) {
					continue;
				}
				// 获得当前sheet的开始行
				int firstRowNum = sheet.getFirstRowNum();
				// 获得当前sheet的结束行
				int lastRowNum = sheet.getLastRowNum();
				// 循环除了第一行的所有行
				for (int rowNum = firstRowNum; rowNum <= lastRowNum; rowNum++) {
					// 获得当前行
					Row row = sheet.getRow(rowNum);
					if (row == null) {
						continue;
					}
					// 获得当前行的开始列
					int firstCellNum = row.getFirstCellNum();
					// 获得当前行的列数
					int lastCellNum = row.getPhysicalNumberOfCells();
					String[] cells = new String[row.getPhysicalNumberOfCells()];
					// 循环当前行
					for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {
						Cell cell = row.getCell(cellNum);
						cells[cellNum] = getCellValue(cell);
					}
					list.add(cells);
				}
			}
			workbook.close();
		}
		return list;
	}

	public static void checkFile(MultipartFile file) throws IOException {
		// 判断文件是否存在
		if (null == file) {
			logger.error("文件不存在!");
			throw new FileNotFoundException("文件不存在!");
		}
		// 获得文件名
		String fileName = file.getOriginalFilename();
		// 判断文件是否是excel文件
		if (!fileName.endsWith(xls) && !fileName.endsWith(xlsx)) {
			logger.error(fileName + "不是excel文件");
			throw new IOException(fileName + "不是excel文件");
		}
	}

	public static Workbook getWorkBook(MultipartFile file) {
		// 获得文件名
		String fileName = file.getOriginalFilename();
		// 创建Workbook工作薄对象,表示整个excel
		Workbook workbook = null;
		try {
			// 获取excel文件的io流
			InputStream is = file.getInputStream();
			// 根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
			if (fileName.endsWith(xls)) {
				// 2003
				workbook = new HSSFWorkbook(is);
			} else if (fileName.endsWith(xlsx)) {
				// 2007
				workbook = new XSSFWorkbook(is);
			}
		} catch (IOException e) {
			logger.info(e.getMessage());
		}
		return workbook;
	}

	public static String getCellValue(Cell cell) {
		String cellValue = "";
		if (cell == null) {
			return cellValue;
		}
		// 把数字当成String来读,避免出现1读成1.0的情况
		if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
			cell.setCellType(Cell.CELL_TYPE_STRING);
		}
		// 判断数据的类型
		switch (cell.getCellType()) {
		case Cell.CELL_TYPE_NUMERIC: // 数字
			cellValue = String.valueOf(cell.getNumericCellValue());
			break;
		case Cell.CELL_TYPE_STRING: // 字符串
			cellValue = String.valueOf(cell.getStringCellValue());
			break;
		case Cell.CELL_TYPE_BOOLEAN: // Boolean
			cellValue = String.valueOf(cell.getBooleanCellValue());
			break;
		case Cell.CELL_TYPE_FORMULA: // 公式
			cellValue = String.valueOf(cell.getCellFormula());
			break;
		case Cell.CELL_TYPE_BLANK: // 空值
			cellValue = "";
			break;
		case Cell.CELL_TYPE_ERROR: // 故障
			cellValue = "非法字符";
			break;
		default:
			cellValue = "未知类型";
			break;
		}
		return cellValue;
	}
}

页面:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>导入Excel表</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body class="dialogBody">
	<div>
		<form id="form2" method="post" action="http://localhost:8080/iot-web-admin/file.do"
			enctype="multipart/form-data" style="align: center">
			<table width="100%" border="0" cellspacing="0" cellpadding="6"
				class="blockTable">
				<tr>
					<td></td>
				</tr>
				<tr>
					<td align="center"><h2>选择Excel表:</h2></td>
					<td align="center">
						<div>
							<input type="file" name="myfile" />
						</div>
					</td>
				</tr>
				<tr>
					<td align="center"><input type="submit" name="submit" value="上传" /></td>
				</tr>
				<tr></tr>
				<tr></tr>
				<tr></tr>
			</table>
		</form>
	</div>
</body>
</html>

Controller

package com.sll.iot.admin.controller.file;

import java.io.IOException;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
@RequestMapping("/")
public class FileController {
	
	@RequestMapping("file")
	public void file(@RequestParam(value="myfile",required=false)MultipartFile myfile) {
		try {
			List<String[]> lists = POIUtil.readExcel(myfile);
			for (String[] list : lists) {
				for (int i = 0; i < list.length; i++) {
					System.out.println(list[i]);
				}
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}


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转载自blog.csdn.net/qq_38157516/article/details/80222990