Java后端压缩文件并下载

前端下载文件

//差旅费报销单zip导出
viewModel.get('button9ag').on('click', function () {
  const prefix = cb.utils.getServiceUrl()
        debugger
        let rows= viewModel.getGridModel().getSelectedRows();
        if(rows.length === 0){
         cb.utils.alert('请先选择数据', 'warring');
         return;
        };

        let ids=[];
        for(let i=0;i<rows.length;i++){
        ids.push(rows[i].id);
        }
        const getTableData =async()=>{
             httpPost(
              '/files/billExport/queryBillDataAndAttachment',
              {
                json:{
                  ids: ids
                }
              },
              {
                uniform:false,
                responseType:'blob'
              }
              ).then((res)=>{
                debugger
　　　　　　　　//const blob = new Blob([res.data],{type:'application/vnd-ms-excel'});
              const blob = new Blob([res.data],{type:'application/zip'});
              const a = document.createElement("a");
              const URL = window.URL || window.webkitURL;
              const href = URL.createObjectURL(blob);
              a.href= href;
              a.download='差旅费报销单.zip';
              document.body.appendChild(a);
              a.click();
              document.body.removeChild(a);
              window.URL.revokeObjectURL(href);
              }).catch((error)=>{
                debugger
                 cb.utils.alert("error")
              })
      
 };
 getTableData()
})


// http请求发送
const httpAjax = (method, url, payload = {},optionData) => {
 return new Promise((resolve, reject) => {
   cb.rest.DynamicProxy.create({
     ensure: {
       url: url,
       method: method,
       options: {
         domainKey: 'npic',
         ...optionData
       }
     }
   }).ensure(payload, (err, res) => {
     if (err) {
       reject(err);
     } else {
       resolve(res);
       }
   });
 });
};
// 提取get请求
const httpGet = (url, payload,optionData) => {
 return httpAjax('GET', url, payload,optionData);
};
// 提取post请求
const httpPost = (url, payload,optionData) => {
 return httpAjax('POST', url, payload,optionData);
};

 

 

 

controller层

 @PostMapping("/queryBillDataAndAttachment")
    public void fileDownload(HttpServletRequest request, HttpServletResponse response, @RequestBody CommonRequestDTO requestDTO) throws Exception {

        OutputStream outputStream = response.getOutputStream();

        fileDownloadService.queryBillDataAndAttachment(requestDTO.getIds(),outputStream);
        response.setHeader("content-type", "application/octet-stream");
        response.setContentType("application/octet-stream");
    }

 

 

service层压缩逻辑

 /**
     * 传入文件file
     * @param outputStream 输出流，从response直接获取，zip文件名称，前端设置
     * @param fileList 需要压缩的文件集合
     */
    public static void downloadZipForFiles(OutputStream outputStream, List<File> fileList){

        ZipOutputStream zipOutputStream = null;
        try {
            zipOutputStream = new ZipOutputStream(outputStream);
            for (File file : fileList) {
　　　　　　　　　　//文件名最后会取new ZipEntity(String name)的name，可以在这里覆盖文件名
                ZipEntry zipEntry = new ZipEntry(file.getName());
                zipOutputStream.putNextEntry(zipEntry);
                byte[] buf = new byte[BUFFER_SIZE];
                int len;
                FileInputStream in = new FileInputStream(file);
                while ((len = in.read(buf)) != -1) {
                    zipOutputStream.write(buf, 0, len);
                    zipOutputStream.flush();
                }
            }
            zipOutputStream.flush();
            zipOutputStream.close();

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭流
            try {
                if (zipOutputStream != null ) {
                    zipOutputStream.close();
                }
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }