Table of contents
1. Introduce alibaba easyexcel maven version 2.1.7 in pom.xml
Notice:! ! ! This case is not available 2.2.? above version
4. Write ExcelService to prepare data, which can be written in the Controller layer
5. Write the Controller layer and call the interface
6. Test whether the export is successful
1. Introduce alibaba easyexcel maven version 2.1.7 in pom.xml
Notice:! ! ! This case is not available 2.2.? above version
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.1.7</version>
</dependency> <dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>4.1</version>
</dependency>2. Write ExcelVo
@Data
@ColumnWidth(value = 20) //列宽度 注解可以写在类上方，也可以写在字段上方
@ContentRowHeight(value = 30) //列高度
@HeadRowHeight(value = 35) //表头高度
public class ExcelVo {
@ExcelProperty(value = "表头单元格一", index = 0)
private String headOne;
@ExcelProperty(value = {"表头单元格二", "Come"}, index = 1)
private String headTwoCome;
@ExcelProperty(value = {"表头单元格二", "On"}, index = 2)
private String headTwoOn;
@ExcelProperty(value = {"表头单元格三", "Come"}, index = 3)
private String headThreeCome;
@ExcelProperty(value = {"表头单元格三", "On"}, index = 4)
private String headThreeOn;
@ExcelProperty(value = {"表头单元格四", "Come"}, index = 5)
private String headFourCome;
@ExcelProperty(value = {"表头单元格四", "On"}, index = 6)
private String headFourOn;
@ExcelProperty(value = {"表头单元格五", "Come"}, index = 7)
private String headFiveCome;
@ExcelProperty(value = {"表头单元格五", "On"}, index = 8)
private String headFiveOn;
@ExcelProperty(value = {"表头单元格六", "Come"}, index = 9)
private String headSixCome;
@ExcelProperty(value = {"表头单元格六", "On"}, index = 10)
private String headSixOn;
@ColumnWidth(value = 30)
@ExcelProperty(value = "表头单元格七", index = 11)
private String headSeven;
}3. Write ExcelUtils
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.write.builder.ExcelWriterBuilder;
import com.alibaba.excel.write.merge.OnceAbsoluteMergeStrategy;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import com.alibaba.excel.write.style.row.SimpleRowHeightStyleStrategy;
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 springboot.redis.demo.model.RetailTargetExcelVo;
import javax.servlet.http.HttpServletResponse;
import java.net.URLEncoder;
import java.util.List;
public class ExcelUtils {
public static void exportExcel(HttpServletResponse response, List<ExcelVo> data)throws Exception{
//1、设置数据表格的样式
// ---------- 头部样式 ----------
WriteCellStyle headStyle = new WriteCellStyle();
// 字体样式
WriteFont headFont = new WriteFont();
headFont.setFontHeightInPoints((short) 11);
headFont.setFontName("宋体");
headFont.setColor(IndexedColors.BLACK.index);
headStyle.setWriteFont(headFont);
WriteCellStyle contentStyle = new WriteCellStyle();
//垂直居中
contentStyle.setVerticalAlignment(VerticalAlignment.CENTER);
//水平居中
contentStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
// 设置边框
// bodyStyle.setBorderTop(BorderStyle.DOUBLE);
contentStyle.setBorderLeft(BorderStyle.THIN);
contentStyle.setBorderRight(BorderStyle.THIN);
contentStyle.setBorderBottom(BorderStyle.THIN);
WriteFont writeFont = new WriteFont();
//加粗
//字体大小为11
writeFont.setFontHeightInPoints((short) 11);
writeFont.setFontName("宋体");
writeFont.setColor(IndexedColors.BLACK.index);
contentStyle.setWriteFont(writeFont);
// 创建单元格策略1 参数1为头样式【不需要头部，设置为null】，参数2位表格内容样式
HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headStyle, contentStyle);
// 创建策略2
// HorizontalCellStyleStrategy dataTableStrategy = new HorizontalCellStyleStrategy(headStyle,bodyStyle);
// 设置数据表格的行高 null表示使用原来的行高
// SimpleRowHeightStyleStrategy rowHeightStrategy3 = new SimpleRowHeightStyleStrategy( null, (short) 18);
//循环合并策略
// LoopMergeStrategy loopMergeStrategy = new LoopMergeStrategy(2, 0);
//一次绝对合并策略
OnceAbsoluteMergeStrategy onceAbsoluteMergeStrategy1 = new OnceAbsoluteMergeStrategy(0, 1, 1, 2); //0，1表示第1行到第2行 1,2表示第2列到第3列
OnceAbsoluteMergeStrategy onceAbsoluteMergeStrategy2 = new OnceAbsoluteMergeStrategy(0, 1, 3, 4);
OnceAbsoluteMergeStrategy onceAbsoluteMergeStrategy3 = new OnceAbsoluteMergeStrategy(0, 1, 5, 6);
OnceAbsoluteMergeStrategy onceAbsoluteMergeStrategy4 = new OnceAbsoluteMergeStrategy(0, 1, 7, 8);
OnceAbsoluteMergeStrategy onceAbsoluteMergeStrategy5 = new OnceAbsoluteMergeStrategy(0, 1, 9, 10);
// response.setContentType("application/vnd.ms-excel");
response.setCharacterEncoding("utf-8");
String fileName = URLEncoder.encode("文件名", "UTF-8");
response.setHeader("content-type", "application/octet-stream");
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".xlsx");
ExcelWriterBuilder excelWriterBuilder = EasyExcel.write(response.getOutputStream(), ExcelVo.class)
// .registerWriteHandler(loopMergeStrategy) // 循环合并策略
.registerWriteHandler(onceAbsoluteMergeStrategy1)
.registerWriteHandler(onceAbsoluteMergeStrategy2)
.registerWriteHandler(onceAbsoluteMergeStrategy3)
.registerWriteHandler(onceAbsoluteMergeStrategy4)
.registerWriteHandler(onceAbsoluteMergeStrategy5)
// .registerWriteHandler(dataTableStrategy) //策略2
.registerWriteHandler(horizontalCellStyleStrategy); //策略1
excelWriterBuilder.sheet("sheet名称").doWrite(data);
}
}
4. Write ExcelService to prepare data, which can be written in the Controller layer
public class ExcelService {
public static List<ExcelVo> getExcelExportData() {
ExcelVo excelVo = new ExcelVo();
List<ExcelVo> list = new ArrayList<>();
for (int i = 0; i < 3; i++) {
excelVo.setHeadOne("qqqq");
excelVo.setHeadTwoCome("wwww");
excelVo.setHeadTwoOn("eee");
excelVo.setHeadThreeCome("rrr");
excelVo.setHeadThreeOn("bgbd");
excelVo.setHeadFourCome("qoqo");
excelVo.setHeadFourOn("规格");
excelVo.setHeadFiveCome("项链");
excelVo.setHeadFiveOn("等等");
excelVo.setHeadSixCome("测试");
excelVo.setHeadSixOn("测试");
excelVo.setHeadSeven("测试");
list.add(excelVo);
}
return list;
}
}5. Write the Controller layer and call the interface
@RestController
public class ExcelController {
//方式一：准备测试数据 ExcelService.getExcelExportData()
@GetMapping("/export")
public void export(HttpServletResponse response) throws Exception {
List<ExcelVo> data = ExcelService.getExcelExportData();
ExcelUtils.exportExcel(response,data);
}
//方式二：通过前端传值测试，前端传的excelVo 字段和ExcelVo类里面的字段对应
@GetMapping("/exportTwo")
public void aliExportDetail(@RequestBody List<ExcelVo> excelVo, HttpServletResponse response) throws Exception {
ExcelUtils.exportExcel(response,excelVo);
}
}6. Test whether the export is successful
Access in the browser address bar: http://localhost:port number/export
In this way, the address of the file to be saved will pop up, click Save, and the save will be successful.
If the port number is unknown,
Configure an application.yml file and simply configure the server port in the file. If redis and database are useful, redis and database must be configured
# 端口号配置
server:
port: 8081
# spring相关 配置
spring:
redis: # 配置redis
database: 0
host: localhost
port: 6379
datasource:# 配置数据库
name:
url: jdbc:mysql://ip地址:3306/test?useSSL=false
username:
password:
driver-class-name: com.mysql.jdbc.Driver #mysql 驱动程序
profiles:
active: def,dev,master
# 配置mybatis
mybatis:
mapper-locations: classpath:*mapper/*.xml
type-aliases-package: com.oda.mall.entity