【超级简单】SpringBoot+poi实现excel导入导出

一、pom引入

  
            org.apache.poi
            poi
            RELEASE
        
        
            org.apache.poi
            poi-ooxml
            RELEASE
        

        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        

二、实体类

package com.re.r.pojo;


import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;

import java.io.Serializable;



@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
public class Teacher implements Serializable {

    private Integer id;

    private String teaNo;

    private String teaName;

}

三、ExcelUntil类

package com.re.r.until;


import com.re.r.pojo.Teacher;
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.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.awt.Color;
import java.net.URLEncoder;

public class ExcelUtils2 {
    public static void exportExcel(HttpServletResponse response, String fileName, ExcelData data) throws Exception {
        // 告诉浏览器用什么软件可以打开此文件
        response.setHeader("content-Type", "application/vnd.ms-excel");
        // 下载文件的默认名称
        response.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "utf-8"));
        exportExcel(data, response.getOutputStream());
    }

    public static void exportExcel(ExcelData data, OutputStream out) throws Exception {

        XSSFWorkbook wb = new XSSFWorkbook();
        try {
            String sheetName = data.getName();
            if (null == sheetName) {
                sheetName = "Sheet1";
            }
            XSSFSheet sheet = wb.createSheet(sheetName);
            writeExcel(wb, sheet, data);

            wb.write(out);
        } catch(Exception e){
            e.printStackTrace();
        }finally{
            //此处需要关闭 wb 变量
            out.close();
        }
    }

    private static void writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {

        int rowIndex = 0;

        rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
        writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
        autoSizeColumns(sheet, data.getTitles().size() + 1);

    }

    private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List titles) {
        int rowIndex = 0;
        int colIndex = 0;

        XSSFFont titleFont = wb.createFont();
        titleFont.setFontName("simsun");
        titleFont.setColor(IndexedColors.BLACK.index);
        XSSFCellStyle titleStyle = wb.createCellStyle();
       // titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
       // titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        //titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
       // titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
        titleStyle.setFont(titleFont);
        //setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        Row titleRow = sheet.createRow(rowIndex);
        colIndex = 0;

        for (String field : titles) {
            Cell cell = titleRow.createCell(colIndex);
            cell.setCellValue(field);
            cell.setCellStyle(titleStyle);
            colIndex++;
        }

        rowIndex++;
        return rowIndex;
    }

    private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List> rows, int rowIndex) {
        int colIndex = 0;
        XSSFFont dataFont = wb.createFont();
        dataFont.setFontName("simsun");
        dataFont.setColor(IndexedColors.BLACK.index);
        XSSFCellStyle dataStyle = wb.createCellStyle();
        //dataStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        //dataStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        dataStyle.setFont(dataFont);
       // setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        for (List