poi实现Excel文件的导入导出

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Maven坐标

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.17</version>
</dependency>

源码

实体类

public class TblVoucher {
    private String identiCode;
    private String ticketCode;
    private String ticketPwd;
    private BigDecimal faceValue;
    private Date createTime;
    private Date endTime;
    private String isValid;

    public String getIdentiCode() {
        return identiCode;
    }

    public void setIdentiCode(String identiCode) {
        this.identiCode = identiCode;
    }

    public String getTicketCode() {
        return ticketCode;
    }

    public void setTicketCode(String ticketCode) {
        this.ticketCode = ticketCode;
    }

    public String getTicketPwd() {
        return ticketPwd;
    }

    public void setTicketPwd(String ticketPwd) {
        this.ticketPwd = ticketPwd;
    }

    public BigDecimal getFaceValue() {
        return faceValue;
    }

    public void setFaceValue(BigDecimal faceValue) {
        this.faceValue = faceValue;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public Date getEndTime() {
        return endTime;
    }

    public void setEndTime(Date endTime) {
        this.endTime = endTime;
    }

    public String getIsValid() {
        return isValid;
    }

    public void setIsValid(String isValid) {
        this.isValid = isValid;
    }
}

读取Excel工具类

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.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import sto.customerapp.materialquery.entity.TblVoucher;

import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class ReadExcelUtils {

	// XSSF -- 提供读写Microsoft Excel OOXML格式档案的功能
	// XSSFWorkbook:是操作Excel2007（以上）的版本，扩展名是.xlsx
	public static List<TblVoucher> read2007Xlsx(InputStream is) throws IOException {
		XSSFWorkbook xWorkbook = new XSSFWorkbook(is);
		List<TblVoucher> list = new ArrayList<>();

		// Read the Sheet
		XSSFSheet xssfSheet = xWorkbook.getSheetAt(0);
		// Read the Row
		for (int rowNum = 1; rowNum <= xssfSheet.getLastRowNum(); rowNum++) {
			XSSFRow xssfRow = xssfSheet.getRow(rowNum);
			if (xssfRow != null) {
				TblVoucher voucher = new TblVoucher();
				voucher.setIdentiCode(xssfRow.getCell(0).getStringCellValue());// 验证码
				voucher.setTicketCode(xssfRow.getCell(1).getStringCellValue());// 券号码
				voucher.setTicketPwd(xssfRow.getCell(2).getStringCellValue());// 券密码
				voucher.setFaceValue(BigDecimal.valueOf(xssfRow.getCell(3).getNumericCellValue()));// 面值
				voucher.setCreateTime(new Date());// 生成时间
				voucher.setEndTime(xssfRow.getCell(4).getDateCellValue());// 截止有效时间
				voucher.setIsValid("1");// 有效
				list.add(voucher);
			}
		}

		xWorkbook.close();
		return list;
	}

	// HSSF -- 提供读写Microsoft Excel格式档案的功能。
	// HSSFWorkbook:是操作Excel2003以前（包括2003）的版本，扩展名是.xls
	public static List<TblVoucher> read2003Xls(InputStream is) throws IOException {
		HSSFWorkbook hWorkbook = new HSSFWorkbook(is);
		List<TblVoucher> list = new ArrayList<>();

		// Read the Sheet
		HSSFSheet hssfSheet = hWorkbook.getSheetAt(0);
		// Read the Row
		for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
			HSSFRow xssfRow = hssfSheet.getRow(rowNum);
			if (xssfRow != null) {
				TblVoucher voucher = new TblVoucher();
				voucher.setIdentiCode(xssfRow.getCell(0).getStringCellValue());// 验证码
				voucher.setTicketCode(xssfRow.getCell(1).getStringCellValue());// 券号码
				voucher.setTicketPwd(xssfRow.getCell(2).getStringCellValue());// 券密码
				voucher.setFaceValue(BigDecimal.valueOf(xssfRow.getCell(3).getNumericCellValue()));// 面值
				voucher.setCreateTime(new Date());// 生成时间
				voucher.setIsValid("1");// 有效
				list.add(voucher);
			}
		}

		hWorkbook.close();
		return list;
	}
}

导出Excel工具类

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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 sto.customerapp.materialquery.entity.TblVoucher;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

public class WriteExcelUtils {
	private static final String EXCEL_XLS = "xls";
	private static final String EXCEL_XLSX = "xlsx";

	public static void writeExcel(String[] titles, List<TblVoucher> list, String fullFileName) {
		Workbook workBook = null;
		OutputStream out = null;
		Sheet sheet = null;
		Row row = null;

		try {
			// 创建Excel文档
			File file = new File(fullFileName);
			if (!file.exists()) {
				// 判断父目录是否存在
				if (!file.getParentFile().exists()) {
					file.getParentFile().mkdirs();// 多层目录创建
				}
				if (file.getName().endsWith(EXCEL_XLS)) { // Excel 2003
					workBook = new HSSFWorkbook();
				} else if (file.getName().endsWith(EXCEL_XLSX)) { // Excel // 2007/2010
					workBook = new XSSFWorkbook();
				}

				// 创建sheet对象
				sheet = (Sheet) workBook.createSheet("sheet1");
				out = new FileOutputStream(fullFileName);
				workBook.write(out);
				out.flush();
				out.close();
			} else {
				if (file.getName().endsWith(EXCEL_XLS)) { // Excel 2003
					workBook = new HSSFWorkbook();
				} else if (file.getName().endsWith(EXCEL_XLSX)) { // Excel // 2007/2010
					workBook = new XSSFWorkbook();
				}
			}

			if (sheet == null) {
				sheet = workBook.createSheet("sheet1");
			}

			// 设置标题行
			row = sheet.createRow(0);
			for (int i = 0; i < titles.length; i++) {
				row.createCell(i).setCellValue(titles[i]);
			}

			for (int j = 1; j <= list.size(); j++) {
				row = sheet.createRow(j);
				TblVoucher voucher = list.get(j - 1);
				row.createCell(0).setCellValue(voucher.getIdentiCode());
				row.createCell(1).setCellValue(voucher.getTicketCode());
			}

			// 创建文件输出流，准备输出电子表格
			out = new FileOutputStream(fullFileName);
			workBook.write(out);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (out != null) {
					out.flush();
					out.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	public static void writeExcelDownload(String[] titles, List<TblVoucher> list, String filename,
			HttpServletRequest request, HttpServletResponse response) throws IOException {
		@SuppressWarnings("resource")
		Workbook wb = new XSSFWorkbook();
		// 创建第一个sheet（页），并命名
		Sheet sheet = wb.createSheet("Hello Sheet");
		// 创建标题行
		Row row = sheet.createRow(0);
		for (int i = 0; i < titles.length; i++) {
			row.createCell(i).setCellValue(titles[i]);
		}
		for (int j = 1; j <= list.size(); j++) {
			row = sheet.createRow(j);
			TblVoucher voucher = list.get(j - 1);
			row.createCell(0).setCellValue(voucher.getIdentiCode());
			row.createCell(1).setCellValue(voucher.getTicketCode());
		}

		response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
		SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
		String currentTime = sdf.format(new Date());
		response.setHeader("Content-disposition",
				"attachment;filename=" + URLEncoder.encode(filename + currentTime + ".xlsx", "UTF-8"));
		OutputStream ouputStream = response.getOutputStream();
		wb.write(ouputStream);
		ouputStream.flush();
		ouputStream.close();
	}
}

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