无模板实现导出操作

public void getexport(Ambassador ambassador,HttpServletResponse response) {
　　　　　//查询语句
        List<Ambassador> ambassadorList = rwAmbassadorApplyMapper.selectExport(ambassador);
　　　　　//创建一个新的list集合存放过滤之后的数据
        List<AmbassadorVo> detailVos = new ArrayList<>();
        for(Ambassador info : ambassadorList) {
　　　　　　　//创建一个新的实体类，该实体类放入导出需要的字段名称
            AmbassadorVo vo = new ambassadorVo();
            vo.setName(info.getName());
            vo.setPhone(info.getPhone());
            vo.setProductId(info.getProductId());
            vo.setTime(info.getTime());
            detailVos.add(vo);
        }
　　　　　//获取当前日期
        String currDate = DateUtil.getCurrentDateStr("yyyy-MM-dd");
        StringBuffer buff = new StringBuffer("导出xxx");
       　//下载
        String fileName = buff.append("_").append(currDate).append(".xlsx").toString();
　　　　　//导出文件存放的目录路径
        String path = SysConfig.getConfig("path");
        List<List<String>> head = getHead();
        EasyExcel.write(path + File.separator + fileName).head(head).registerWriteHandler(new CustomCellWriteHandler())
                .sheet("导出xxx").doWrite(detailVos);
        try {
            export(response, fileName);
            log.info("文件导出成功");
        } catch (Exception e) {
            e.printStackTrace();
            log.error("文件导出失败");
        }
    }
    
    public List<List<String>> getHead() {
        List<List<String>> head = new ArrayList<>();
        List<String> col1 = new ArrayList<>();
        List<String> col2 = new ArrayList<>();
        List<String> col3 = new ArrayList<>();
        List<String> col4 = new ArrayList<>();  
        col1.add("用户名");
        col2.add("手机号");
        col3.add("产品");
        col4.add("时间");
        head.add(col1);
        head.add(col2);
        head.add(col3);
        head.add(col4);
        return head;
    }

protected void export(HttpServletResponse response, String fileName) throws Exception {
        response.setCharacterEncoding("UTF-8");
        response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
        if (fileName.endsWith(".xlsx")) {
            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        } else {
            response.setContentType("application/octet-stream");
        }

        File file = new File(SysConfig.getConfig("path"), fileName);
        try (FileInputStream fileInputStream = new FileInputStream(file);
                InputStream is = new MultipartInputStream(fileInputStream);) {
            FileCopyUtils.copy(is, response.getOutputStream());
        } finally {
            if (file.exists()) {
                FileUtils.deleteQuietly(file);
            }
        }
    }

/**
*导出需要的实体类
**/
@Data
public class AmbassadorVo {
    
    /** 用户名 **/
　　/** 根据导出需要的顺序填写index值，防止导出的数据位置不正确 **/　　
    @ExcelProperty(value = "用户名", index = 0)
    private String name;
    
    /** 手机号 **/
    @ExcelProperty(value = "手机号", index = 1)
    private String phone;
    
    /** 产品 **/
    @ExcelProperty(value = "产品", index = 2)
    private String productId;
    
    /** 时间 **/
    @ExcelProperty(value = "时间", index = 3)
    private String time;

}