java对excel写入与读取

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maven:

<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi</artifactId>
	<version>3.16</version>
</dependency>

java代码:

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFFont;
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.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.HorizontalAlignment;

/**
 * excel导出工具类
 */
public class ExcelUtils {
	// excel默认宽度；
	private static int width = 256 * 14;
	// 默认字体
	private static String excelfont = "微软雅黑";
	private static HSSFWorkbook wb;
	private static HSSFWorkbook workbookRead;

	/**
	 * @param excelName  导出的EXCEL名字
	 * @param headers    导出的表格的表头
	 * @param ds_titles  导出的数据 map.get(key) 对应的 key
	 * @param data       数据集 List<Map>
	 */
	public static void export(String excelName, String[] headers, String[] ds_titles, List<Map<String, Object>> data, 
			HttpServletRequest request, HttpServletResponse response)
			throws IOException {
		export(excelName, "sheet1", headers, ds_titles, data, request, response);
	}
	
	/**
	 * @param excelName  导出的EXCEL名字
	 * @param sheetName  导出的SHEET名字 当前sheet数目只为1
	 * @param headers    导出的表格的表头
	 * @param ds_titles  导出的数据 map.get(key) 对应的 key
	 * @param data       数据集 List<Map>
	 */
	public static void export(String excelName, String sheetName, String[] headers, String[] ds_titles, List<Map<String, Object>> data, 
			HttpServletRequest request, HttpServletResponse response)
			throws IOException {
		int[] ds_format = new int[ds_titles.length];
		int[] widths = new int[ds_titles.length];
		for(int i=0;i<ds_titles.length;i++){
			ds_format[i] = 1;
			widths[i] = width;
		}
		export(excelName, sheetName, headers, ds_titles, ds_format, widths, data, request, response);
	}
	
	/**
	 * @param excelName    导出的EXCEL名字
	 * @param sheetName    导出的SHEET名字 当前sheet数目只为1
	 * @param headers      导出的表格的表头
	 * @param ds_titles    导出的数据 map.get(key) 对应的 key
	 * @param ds_format    导出数据的样式 
	 * 1:String left; 2:String center 3:String right 4 int  right 5:float ###,###.## right 6:number: #.00% 百分比 right
	 * @param widths       表格的列宽度 默认为 256*14
	 * @param data         数据集 List<Map>
	 */
	public static void export(String excelName, String sheetName, String[] headers, String[] ds_titles, int[] ds_format,
			int[] widths, List<Map<String, Object>> data, HttpServletRequest request, HttpServletResponse response)
			throws IOException {
		HttpSession session = request.getSession();
		session.setAttribute("state", null);
		if (widths == null) {
			widths = new int[ds_titles.length];
			for (int i = 0; i < ds_titles.length; i++) {
				widths[i] = width;
			}
		}
		if (ds_format == null) {
			ds_format = new int[ds_titles.length];
			for (int i = 0; i < ds_titles.length; i++) {
				ds_format[i] = 1;
			}
		}
		// 设置文件名
		String fileName = "";
		if (StringUtils.isNotEmpty(excelName)) {
			fileName = excelName;
		}
		wb = new HSSFWorkbook();
		// 创建一个sheet
		HSSFSheet sheet = wb.createSheet(StringUtils.isNotEmpty(sheetName) ? sheetName : "excel");
		// 创建表头，如果没有跳过
		int headerrow = 0;
		if (headers != null) {
			HSSFRow row = sheet.createRow(headerrow);
			// 表头样式
			HSSFCellStyle style = wb.createCellStyle();
			HSSFFont font = wb.createFont();
			font.setBold(true);
			font.setFontName(excelfont);
			font.setFontHeightInPoints((short) 11);
			style.setFont(font);
			style.setAlignment(HorizontalAlignment.CENTER);
			style.setBorderBottom(BorderStyle.THIN);
			style.setBorderLeft(BorderStyle.THIN);
			style.setBorderRight(BorderStyle.THIN);
			style.setBorderTop(BorderStyle.THIN);
			for (int i = 0; i < headers.length; i++) {
				sheet.setColumnWidth((short) i, (short) widths[i]);
				HSSFCell cell = row.createCell(i);
				cell.setCellValue(headers[i]);
				cell.setCellStyle(style);
			}
			headerrow++;
		}
		// 表格主体 解析list
		if (data != null) {
			List<HSSFCellStyle> styleList = new ArrayList<HSSFCellStyle>();
			for (int i = 0; i < ds_titles.length; i++) { // 列数
				HSSFCellStyle style = wb.createCellStyle();
				HSSFFont font = wb.createFont();
				font.setFontName(excelfont);
				font.setFontHeightInPoints((short) 10);
				style.setFont(font);
				style.setBorderBottom(BorderStyle.THIN);
				style.setBorderLeft(BorderStyle.THIN);
				style.setBorderRight(BorderStyle.THIN);
				style.setBorderTop(BorderStyle.THIN);
				if (ds_format[i] == 1) {
					style.setAlignment(HorizontalAlignment.LEFT);
				} else if (ds_format[i] == 2) {
					style.setAlignment(HorizontalAlignment.CENTER);
				} else if (ds_format[i] == 3) {
					style.setAlignment(HorizontalAlignment.RIGHT);
					// 整型
				} else if (ds_format[i] == 4) {
					style.setAlignment(HorizontalAlignment.RIGHT);
					// 整型
					style.setDataFormat(HSSFDataFormat.getBuiltinFormat("0"));
				} else if (ds_format[i] == 5) {
					// float类型
					style.setAlignment(HorizontalAlignment.RIGHT);
					style.setDataFormat(HSSFDataFormat.getBuiltinFormat("#,##0.00"));
				} else if (ds_format[i] == 6) {
					// 百分比类型
					style.setAlignment(HorizontalAlignment.RIGHT);
					style.setDataFormat(HSSFDataFormat.getBuiltinFormat("0.00%"));
				}
				styleList.add(style);
			}
			for (int i = 0; i < data.size(); i++) { // 行数
				HSSFRow row = sheet.createRow(headerrow);
				@SuppressWarnings("rawtypes")
				Map map = data.get(i);
				for (int j = 0; j < ds_titles.length; j++) { // 列数
					HSSFCell cell = row.createCell(j);
					Object o = map.get(ds_titles[j]);
					if (o == null || "".equals(o)) {
						cell.setCellValue("");
					} else if (ds_format[j] == 4) {
						cell.setCellValue((Long.valueOf((map.get(ds_titles[j])) + "")).longValue());
					} else if (ds_format[j] == 5 || ds_format[j] == 6) {
						cell.setCellValue((Double.valueOf((map.get(ds_titles[j])) + "")).doubleValue());
					} else {
						cell.setCellValue(map.get(ds_titles[j]) + "");
					}
					cell.setCellStyle((HSSFCellStyle) styleList.get(j));
				}
				headerrow++;
			}
		}
		fileName = fileName + ".xls";
		String filename = "";
		try {
			filename = encodeChineseDownloadFileName(request, fileName);
		} catch (Exception e) {
			e.printStackTrace();
		}
		response.setHeader("Content-disposition", filename);
		response.setContentType("application/vnd.ms-excel");
		response.setHeader("Content-disposition", "attachment;filename=" + filename);
		response.setHeader("Pragma", "No-cache");
		OutputStream ouputStream = response.getOutputStream();
		wb.write(ouputStream);
		ouputStream.flush();
		ouputStream.close();
		session.setAttribute("state", "open");

	}

	/**
	 * 对文件流输出下载的中文文件名进行编码 屏蔽各种浏览器版本的差异性
	 */
	public static String encodeChineseDownloadFileName(HttpServletRequest request, String pFileName) throws Exception {
		String filename = null;
		String agent = request.getHeader("USER-AGENT");
		if (null != agent) {
			if (-1 != agent.indexOf("Firefox")) {
				filename = "=?UTF-8?B?" + (new String(Base64.encodeBase64(pFileName.getBytes("UTF-8")))) + "?=";
			} else if (-1 != agent.indexOf("Chrome")) {
				filename = new String(pFileName.getBytes(), "ISO8859-1");
			} else {
				filename = URLEncoder.encode(pFileName, "UTF-8");
				filename = filename.replace("+", "%20");
			}
		} else {
			filename = pFileName;
		}
		return filename;
	}
	
	public static void main(String args[]){
		try {
			List<String> rs = getSheetData("D:\\工号比对结果.csv");
			for(int i=0;i<rs.size();i++){
				System.err.println(rs.get(i));
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 读取excel表格数据
	 * @param filePath  文件路径
	 */
	public static List<String> getSheetData(String filePath) throws IOException {
		return getSheetData(filePath,2);
	}
	
	/**
	 * 读取excel表格数据
	 * @param filePath  文件路径
	 * @param msgLine   从第几行开始读取
	 */
	public static List<String> getSheetData(String filePath,int msgLine) throws IOException {
		return getSheetData(filePath, "", msgLine);
	}
	
	/**
	 * 读取excel表格数据
	 * @param filePath  文件路径
	 * @param sheetName sheet名称:为空为读取所有
	 * @param msgLine   从第几行开始读取
	 */
	public static List<String> getSheetData(String filePath,String sheetName,int msgLine) throws IOException {
		if(msgLine==0){
			msgLine = 1;
		}
		List<String> rs = new ArrayList<String>();
		workbookRead = new HSSFWorkbook(new FileInputStream(new File(filePath)));
		HSSFSheet sheet = null;
		String excelStName = "";
		int cols = 0;
		StringBuffer stringBuffer = new StringBuffer();
		for (int i = 0; i < workbookRead.getNumberOfSheets(); i++) { // 获取每个Sheet表
			sheet = workbookRead.getSheetAt(i);
			excelStName = sheet.getSheetName();
			if (!"".equals(sheetName) && !sheetName.equals(excelStName)) {
				continue;
			}
			for (int j = 0; j < sheet.getPhysicalNumberOfRows(); j++) { // 获取每行
				HSSFRow row = sheet.getRow(j);
				if(j==0){
					cols = row.getPhysicalNumberOfCells(); // 以第一行为准获取总列数
				}
				if(j+1 < msgLine){
					continue;
				}
				stringBuffer = new StringBuffer();
				for (int k = 0; k < cols; k++) { // 获取每个单元格
					stringBuffer.append(StringUtil.strFormatNull(row.getCell(k))).append("|");
				}
				stringBuffer.append(excelStName);
				rs.add(stringBuffer.toString());
			}
		}
		return rs;
    }
	
}