根据excel模板导出excel表格 返回流给前端_后端生成excel文件,以流的形式返回给前端

java代码

pom文件

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>2.2.4</version>
</dependency>

java代码

public void exportStoreSignList(HttpServletResponse response,@RequestParam(value="createTime",required = false)String createTime,@RequestParam(value="topic",required = false)String topic,
                                      @RequestParam(value="nowTime",required = false)String nowTime,@RequestParam(value="name",required = false)String name,
                                      @RequestParam(value="tableName",required = false)String tableName) throws Exception {
        //获取模板
        ClassPathResource classPathResource = new ClassPathResource("/excel/excelCharts.xlsx");
        //输入流
        InputStream inputStream = null;
        //输出流
        ServletOutputStream outputStream = null;
        //处理填充数据
        List<Map<String,Object>> storeList = new ArrayList<>();
        storeList = this.excelcharts(createTime,topic);
        ExcelWriter excelWriter = null;
        Map<String,Object> map = new HashMap<>();
        if(tableName != null && tableName != ""){
            map.put("name",name);
        }else{
            map.put("name","");
        }
        if(tableName != null && tableName != ""){
            String rkDateFormat = createTime.substring(0, 4) + "年" + createTime.substring(5, 7) + "月" + createTime.substring(8, 10) + "日";
            map.put("createTime",rkDateFormat);
        }else{
            map.put("createTime","");
        }
        try {
            //输入流
            inputStream = classPathResource.getInputStream();
            String fileName = URLEncoder.encode(tableName, "UTF-8");
            response.setCharacterEncoding("utf-8");
            //返回的数据类型
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            //响应头
            response.setHeader("Content-Disposition", "attachment;fileName="
                + fileName);
            outputStream = response.getOutputStream();
 
            excelWriter = EasyExcel.write(outputStream).withTemplate(inputStream).build();
            WriteSheet writeSheet = EasyExcel.writerSheet().build();
            FillConfig fillConfig = FillConfig.builder().forceNewRow(Boolean.TRUE).build();
            excelWriter.fill(map, writeSheet);
            excelWriter.fill(new FillWrapper("data", storeList), fillConfig, writeSheet);
            outputStream.flush();
 
            excelWriter.finish();
        } catch (IOException e) {
            e.printStackTrace();
            throw new RuntimeException("导出错误！");
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("异常！");
        }finally {
            // 千万别忘记finish 会帮忙关闭流
            if (excelWriter != null) {
                excelWriter.finish();
            }
            //关闭流
            if (outputStream != null) {
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

vue

await exportStoreList(createTime,topic,nowTime,name,tableName).then((res) => {
        console.log("exportStoreList==================>",res)
 
        if (!res) {
            return
        }
        let url = window.URL.createObjectURL(new Blob([res]))
        let link = document.createElement('a')
        link.style.display = 'none'
        link.href = url
        link.setAttribute('download', this.excelChartsName)
 
        document.body.appendChild(link)
        link.click()
      }).catch(err => console.log('下载失败', err))