前端实现下载pdf功能

vue点击下载，下载pdf

图片展示

前端代码

 //下载
      downloadFile(){
        let params = { //参数列表
        path: this.fileName
      };
      var Axios = axios.create({
        timeout: 3600 * 1000
      });

      //添加请求拦截器
      Axios.interceptors.request.use(
        function (config) {
          // 在发送请求之前处理
          // header头添加token 
          config.headers['authc-token'] = window.localStorage.token;
          return config;
        },
        function (error) {
          // 发送请求错误处理
          return Promise.reject(error);
        }
      );
      let url = "请求接口"

      Axios.post(url, params, { headers: { 'Content-Type': 'application/x-www-form-urlencoded' }, responseType: "blob" }).then(res => {
        const link = document.createElement("a");
        let blob = new Blob([res.data], { type: "application/pdf" }); //类型excel 
        link.style.display = "none";
        link.href = URL.createObjectURL(blob);
        link.setAttribute("download", this.fileName);
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
      }).catch(res => {
        console.log(res);
      });
      },

后端代码

Controller层

    /**
     * 下载接口，传入一个路径就可以了
     * @param request
     * @param response
     * @return
     */
    @RequestMapping(value = "/download", method = RequestMethod.POST)
    public byte[] download(HttpServletRequest request, HttpServletResponse response) {
        byte[] bytes = null;
        try{
        //将传入参数转换为JSONObject，这里是我自己写记的，换成自己的
            JSONObject requestJson = JsonUtil.httpParameterToJSONObject(request);
             bytes = pdfService.downFile(requestJson);
        }catch (Exception e){
            e.printStackTrace();
        }
        return bytes;
    }

interface接口

    /**
     * 前端下载文件
     * @param jsonObject
     * @return
     */
    byte[] downFile(JSONObject jsonObject);

service层

    @Override
    public byte[] downFile(JSONObject jsonObject) {
        byte[] bytes = null;
        try{
        	//传过来的文件名
            String path = jsonObject.getString("path");

            File file = new File("自己的文件路径"+path);
            bytes = DownloadFile.File2byte(file);
        }catch (Exception e){
            logger.error("PdfServiceImpl——>downFile——>下载pdf异常",e.fillInStackTrace());
        }

        return bytes;
    }

DownloadFile类

    /**
     * 将文件转换成byte数组
     * @param filePath  文件File类 通过new File(文件路径)
     * @return byte数组
     */
    public static byte[] File2byte(File filePath) {
        byte[] buffer = null;
        try {
            FileInputStream fis = new FileInputStream(filePath);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            byte[] b = new byte[1024];
            int n;
            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }
            fis.close();
            bos.close();
            buffer = bos.toByteArray();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return buffer;
    }