File excel export

1. rely on

	<!--easyExcel-->
	<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>easyexcel</artifactId>
		<version>2.1.4</version>
	</dependency>

2.controller

@RequestMapping(method = RequestMethod.GET, value = "/export")
@Accessable(moduleName = " export ", name = " Inquire about ", function = "EnrollInfo", requireRole = false, requireLogin = false, log = false)
@ApiOperation(value = " export ")
public void export(HttpServletResponse response, String productId) {
    this.codeService.export(response, productId);
}

3.serviceImpl Function realization

    @Override
public void export(HttpServletResponse response, String productId) {

    String fileName = filePath;

    log.info(" Export file path ：{}", fileName);
    ExcelWriter excelWriter = null;
    WriteSheet writeSheet = EasyExcel.writerSheet("sheet1").build();
    fileName += "/export/" + " Code table " + System.currentTimeMillis() + ".xlsx";
    excelWriter = EasyExcel.write(fileName, CodeExcelVo.class).build();
    excelWriter.write(data_export(productId), writeSheet);

    //  Don't forget finish  Will help shut down the flow 
    excelWriter.finish();
    response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.DEFAULT.encode(" Code table ", StandardCharsets.UTF_8));
    response.setContentType("application/octet-stream");
    try {
        byte[] bytes = Files.toByteArray(new File(fileName));
        ServletOutputStream stream = response.getOutputStream();
        stream.write(bytes);
        stream.flush();
        stream.close();
    } catch (IOException e) {
        throw new BusinessException(" Please try again ");
    }
}


//   The query needs to export the set 		
    private List<CodeExcelVo> data_export(String productId) {
    
    List<CodeExcelVo> list = new ArrayList<>();
    LambdaQueryWrapper<Code> wrapper = new LambdaQueryWrapper<>();
    List<Code> codes = codeMapper.selectList(wrapper.eq(Code::getDataStatus, 		     0).eq(Code::getProductId, productId));
    codes.forEach(c -> {
        CodeExcelVo vo = new CodeExcelVo();
        BeanUtils.copyProperties(c, vo);
        list.add(vo);
    });
//         Mapping values 
        List<User> allUser = userDao.getAllUser();
        Map<Long, String> userMap = allUser.stream().collect(Collectors.toMap(User::getId, User::getUserName));
        if (!ObjectUtils.isEmpty(list)) {
            list.forEach(a -> {
                // Whether to spend 
                a.setIsConsumeStr(a.getIsConsume() == 1 ? " Have consumed " : " Not consumed ");
                if (!ObjectUtils.isEmpty(a.getConsumeBy())) {
                    a.setConsumeBy(userMap.get(Long.valueOf(a.getConsumeBy())));
                }
            });
        }
        return list;
    }

4.Code It maps to —>CodeExcelVo export

import com.alibaba.excel.annotation.ExcelIgnore;
import com.alibaba.excel.annotation.ExcelProperty;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import lombok.experimental.Accessors;
import java.util.Date;
@Data
@ApiModel(value = " Code table excel Mapping entities ")
@Accessors(chain = true)
public class CodeExcelVo {
    @TableId(type = IdType.AUTO)
    private String id;

    @ExcelProperty(" The product name ")
    @ApiModelProperty(required = false, value = " The product name ")
    private String productName;

    @ExcelIgnore
    @ApiModelProperty(required = false, value = " product id")
    private String productId;

    @ExcelProperty(" Product model ")
    @ApiModelProperty(required = false, value = " Product model ")
    private String productModel;

    @ExcelProperty(" Code year ")
    @ApiModelProperty(required = false, value = " Code year ")
    private String codeYear;

    @ExcelProperty(" Coding batch ")
    @ApiModelProperty(required = false, value = " Coding batch ")
    private int codeBatch;

    @ExcelProperty("S/N code ")
    @ApiModelProperty(required = false, value = "S/N code ")
    private String snCode;

    @ExcelProperty("mac code ")
    @ApiModelProperty(required = false, value = "mac code ")
    private String macCode;


    @ExcelProperty(" Whether to spend ")
    @ApiModelProperty(required = false, value = " Whether to spend ")
    private String isConsumeStr;

    @ExcelIgnore
    @ApiModelProperty(required = false, value = " Whether to spend ")
    private int isConsume;

    @ExcelProperty(" dissipate ")
    @ApiModelProperty(required = false, value = " dissipate ")
    private Date consumeTime;

    @ExcelProperty(" Consumer ")
    @ApiModelProperty(required = false, value = " Consumer ")
    private String consumeBy;

}