环境说明

jdk1.8，springboot2.5.3

项目结构

1.controller层

package com.example.pdf.controller;import com.example.pdf.service.ExportDataToExcelService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;@RestController
@RequestMapping(value = "export")
public class ExportDataToExcelController {@Resourceprivate ExportDataToExcelService exportDataToExcelService;@GetMapping("dataToExcel")public void dataToExcel(HttpServletResponse response) {exportDataToExcelService.dataToExcel(response);}
}

2.service层

package com.example.pdf.service;import javax.servlet.http.HttpServletResponse;public interface ExportDataToExcelService {/*** 导出数据到excel表中** @param response*/void dataToExcel(HttpServletResponse response);
}

3.实现层

package com.example.pdf.service.impl;import com.example.pdf.model.ProductModel;
import com.example.pdf.service.ExportDataToExcelService;
import com.example.utils.ExcelUtil;
import org.springframework.stereotype.Service;import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;@Service
public class ExportDataToExcelServiceImpl implements ExportDataToExcelService {/*** 导出数据到excel表中** @param response*/@Overridepublic void dataToExcel(HttpServletResponse response) {List<ProductModel> models = new ArrayList<>();// 模拟5条数据ProductModel p1 = new ProductModel("矿泉水", 2, "瓶");ProductModel p2 = new ProductModel("凤梨", 4, "个");ProductModel p3 = new ProductModel("笔记本", 1, "台");ProductModel p4 = new ProductModel("球鞋", 1, "双");ProductModel p5 = new ProductModel("超跑", 10, "辆");// 将模拟数据存入集合models.add(p1);models.add(p2);models.add(p3);models.add(p4);models.add(p5);try {// 导出数据ExcelUtil.export(response, ProductModel.class, models, "商品列表", ExcelUtil.getStyleStrategy());} catch (Exception e) {System.out.println("商品列表导出异常！");}}
}

4.工具类：ExcelUtil.java

package com.example.utils;import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.springframework.stereotype.Component;import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;@Component
public class ExcelUtil {/*** 导出excel** @param response* @param head* @param data* @param sheetName* @param horizontalCellStyleStrategy*/public static void export(HttpServletResponse response, Class head, List data, String sheetName, HorizontalCellStyleStrategy horizontalCellStyleStrategy) throws IOException {//给定导出实体类EasyExcel.write(response.getOutputStream(), head)//给定工作表名称.sheet(sheetName)//给定样式.registerWriteHandler(horizontalCellStyleStrategy)//给定导出数据.doWrite(data);}/*** 设置生成excel样式 去除默认表头样式及设置内容居中，如有必要可重载该方法给定参数配置不同样式** @return HorizontalCellStyleStrategy*/public static HorizontalCellStyleStrategy getStyleStrategy() {//内容样式策略WriteCellStyle contentWriteCellStyle = new WriteCellStyle();//垂直居中,水平居中contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 设置单元格边框contentWriteCellStyle.setBorderLeft(BorderStyle.THIN);contentWriteCellStyle.setBorderTop(BorderStyle.THIN);contentWriteCellStyle.setBorderRight(BorderStyle.THIN);contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);//设置 自动换行contentWriteCellStyle.setWrapped(false);// 字体策略WriteFont contentWriteFont = new WriteFont();// 字体大小contentWriteFont.setFontHeightInPoints((short) 12);contentWriteCellStyle.setWriteFont(contentWriteFont);//头策略使用默认WriteCellStyle headWriteCellStyle = new WriteCellStyle();headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());return new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);}}

5.ProductModel.java类

package com.example.pdf.model;import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import lombok.Data;@Data
public class ProductModel {public ProductModel(String productName, Integer number, String unit) {this.productName = productName;this.number = number;this.unit = unit;}@ColumnWidth(15)@ExcelProperty("商品名称")private String productName;@ColumnWidth(15)@ExcelProperty("商品数量")private Integer number;@ColumnWidth(15)@ExcelProperty("商品单位")private String unit;
}

使用的Maven依赖

<!-- lombok插件 --><dependency><artifactId>lombok</artifactId><groupId>org.projectlombok</groupId><scope>provided</scope><version>1.18.10</version></dependency><!-- alibaba Excel --><dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.3.2</version></dependency>

postman请求展示，返回内容需要前端接收

浏览器接收说明（如果下载下来的为zip类型，记得将后缀改为：xlsx，再打开）

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