后台接口返回void有设置response相关内容,前端通过open打开接口下载excel文件

1、引入依赖，用来生成excel

            com.alibaba
            easyexcel
            2.1.2
        

2、接口类代码如下：

/**
     * 企业列表--导出
     */
    @ApiOperation("企业列表--导出")
    @GetMapping(value = "/downloadTenantList")
    public void downloadTenantList(HttpServletRequest request,
                   HttpServletResponse response) throws IOException {
        log.info("downloadTenantList begin.");
        String tenantIds = request.getParameter("tenantIds");
        Map map = tenantService.exportTenantListByIds(tenantIds);
        String filePath = map.get("filePath");
        String fileName = map.get("fileName");
        InputStream is = new FileInputStream(new File(filePath));
        // 设置response参数，可以打开下载页面
        response.reset();
        response.setContentType("application/octet-stream;charset=utf-8");
        response.setHeader("Access-Control-Expose-Headers", "content-disposition");
        response.setHeader("Content-Disposition", "attachment;filename="+fileName);
        ServletOutputStream out = response.getOutputStream();
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            bis = new BufferedInputStream(is);
            bos = new BufferedOutputStream(out);
            byte[] buff = new byte[2048];
            int bytesRead;
            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, bytesRead);
            }
            log.info("downloadTenantList end.");
        } catch (final IOException e) {
            log.error("downloadTenantList errors, reason:{}", e.getMessage());
        } finally {
            if (bis != null){
                bis.close();
            }
            if (is != null){
                is.close();
            }
            if (bos != null){
                bos.close();
            }
            if (out != null){
                out.close();
            }
        }
        // 用后删除临时用途的文件
        File fileTempZip = new File(filePath);
        if(fileTempZip.exists()){
            fileTempZip.delete();
        }
    }
	

3、服务层代码如下：

public Map exportTenantListByIds(String ids) {
        String[] idStrs = ids.split(",");
        List list = tenantMapper.listTenantsByIds(Arrays.asList(idStrs));
        List listExport = new ArrayList();
        if(list!=null && !list.isEmpty()) {
            // 处理企业相关信息，管理员、人数、企业行业、企业类型、企业规模
            handleTenantRelatedInfo(list);
            listExport = handleTenantListForExport(list);
        }
        String fileName = UuidUtil.getUuid() + ".xlsx";
        String filePath = filePathTemp + fileName;
        EasyExcel.write(filePath, TenantInfoExcelDTO.class)
                .sheet("企业列表")
                .doWrite(listExport);
        Map map = new HashMap();
        map.put("fileName",fileName);
        map.put("filePath",filePath);
        return map;
    }

4、TenantInfoExcelDTO类代码如下：

package cn.iiot.myth.platform.dto.tenant;
import com.alibaba.excel.annotation.ExcelProperty;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.Date;
/**
 * 
 * 企业列表
 * 
 *
 * @author heming@iiot.cn
 * @date 2024-05-06
 */
@NoArgsConstructor
@AllArgsConstructor
@Data
@Builder
public class TenantInfoExcelDTO {
    @ExcelProperty(value = "编号")
    private String tenantId;
    @ExcelProperty(value = "企业/组织机构名称")
    private String companyName;
    @ExcelProperty(value = "所属行业")
    private String companyIndustry;
    @ExcelProperty(value = "规模")
    private String companyScale;
    @ExcelProperty(value = "联系人")
    private String contacts;
    @ExcelProperty(value = "管理员")
    private String managerNames;
    @ExcelProperty(value = "平台成员数量")
    private int userCount;
    @ExcelProperty(value = "联系号码")
    private String mobile;
    @ExcelProperty(value = "联系邮箱")
    private String email;
    @ExcelProperty(value = "认证状态")
    private String auditStatus;
    @ExcelProperty(value = "入驻时间")
    private Date createTime;
    @ExcelProperty(value = "认证时间")
    private Date joinDate;
}

5、前端使用window.open("接口路径");下载该excel文件。

功能正常使用，但是这种方式，前端加不了认证头信息，该后台接口不安全。

解决方案参考：后台接口返回void但是response有设置合适的相关信息，前端调用接口解析Blob数据下载excel文件-CSDN博客