SpringBoot实现导出Excel表格功能

源码下载

添加依赖 pom.xml

        
        
            org.apache.poi
            poi
            3.13
        
        
            org.apache.poi
            poi-ooxml
            3.13
        
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.1.1
        
        
        
            com.sdsvs.finsvc
            mysql-connector
            1.1
        
        
        
            org.projectlombok
            lombok
            true
        

配置文件配置 application.yml

#端口号
server:
  port: 8080
##数据库的配置信息
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/user?serverTimezone=UTC&?useUnicode=true&characterEncoding=utf8 #自己的 数据库 名称
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver
mybatis:
  #开启驼峰命名法
  configuration:
    map-underscore-to-camel-case: true
mybatis-plus:
  # xml地址
  mapper-locations: classpath:mapper/*Mapper.xml
  # 实体扫描，多个package用逗号或者分号分隔
  type-aliases-package: com.niuben.entity   #自己的实体类地址
  configuration:
    # 这个配置会将执行的sql打印出来，在开发或测试的时候可以用
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

Excel工具类 ExcelUtils

package com.niuben.utils;

import com.niuben.model.ExcelData;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder.BorderSide;

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

/**
 * @author： NiuBen
 * @date： Created in 2019/12/15 19:48
 * @description：
 */
public class ExcelUtils {
    /**
     * 使用浏览器选择路径下载
     * @param response
     * @param fileName
     * @param data
     * @throws Exception
     */
    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 + ".xlsx", "utf-8"));
        exportExcel(data, response.getOutputStream());
    }


    private static int exportExcel(ExcelData data, OutputStream out) throws Exception {
        XSSFWorkbook wb = new XSSFWorkbook();
        int rowIndex = 0;
        try {
            String sheetName = data.getName();
            if (null == sheetName) {
                sheetName = "Sheet1";
            }
            XSSFSheet sheet = wb.createSheet(sheetName);
            rowIndex = writeExcel(wb, sheet, data);
            wb.write(out);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //此处需要关闭 wb 变量
            out.close();
        }
        return rowIndex;
    }


    /**
     * 表显示字段
     * @param wb
     * @param sheet
     * @param data
     * @return
     */
    private static int writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {
        int rowIndex = 0;
        rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
        rowIndex = writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
        autoSizeColumns(sheet, data.getTitles().size() + 1);
        return rowIndex;
    }
    /**
     * 设置表头
     *
     * @param wb
     * @param sheet
     * @param titles
     * @return
     */
    private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List titles) {
        int rowIndex = 0;
        int colIndex = 0;
        Font titleFont = wb.createFont();
        //设置字体
        titleFont.setFontName("simsun");
        //设置粗体
        titleFont.setBoldweight(Short.MAX_VALUE);
        //设置字号
        titleFont.setFontHeightInPoints((short) 14);
        //设置颜色
        titleFont.setColor(IndexedColors.BLACK.index);
        XSSFCellStyle titleStyle = wb.createCellStyle();
        //水平居中
        titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        //垂直居中
        titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        //设置图案颜色
        titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
        //设置图案样式
        titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
        titleStyle.setFont(titleFont);
        setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));
        Row titleRow = sheet.createRow(rowIndex);
        titleRow.setHeightInPoints(25);
        colIndex = 0;
        for (String field : titles) {
            Cell cell = titleRow.createCell(colIndex);
            cell.setCellValue(field);
            cell.setCellStyle(titleStyle);
            colIndex++;
        }
        rowIndex++;
        return rowIndex;
    }

    /**
     * 设置内容
     *
     * @param wb
     * @param sheet
     * @param rows
     * @param rowIndex
     * @return
     */
    private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List> rows, int rowIndex) {
        int colIndex;
        Font dataFont = wb.createFont();
        dataFont.setFontName("simsun");
        dataFont.setFontHeightInPoints((short) 14);
        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