通过文件路径下载

川长思鸟来 2023-10-14 09:21 64阅读 0赞

/**
         * 上传文件存储在本地的根路径
         */
        @Value("${file.local.path}")
        private String localFilePath;
    
        /**
         * url前缀
         */
        @Value("${file.local.urlPrefix}")
        public String localFileUrlPrefix;
    
    
    /**
         * 通过路径下载
      
         */
        @ApiImplicitParams({
                @ApiImplicitParam(paramType = "query", name = "filepath", dataType = "String", required = true, value = "文件虚拟地址"),
        })
        @ApiOperation("通过路径下载")
        @GetMapping(value = "/downloadPathFile")
        public String downloadPathFile(HttpServletRequest request, HttpServletResponse response) {
            String filepath = request.getParameter("filepath");// 文件名
            try {
                filepath= URLDecoder.decode(filepath,"UTF-8");
            } catch (UnsupportedEncodingException e) {
                log.error("文件路径解码失败，{}",e);
            }
            if (filepath != null) {
                String fileName=filepath.substring(filepath.lastIndexOf("/")+1);
                fileName = filepath.substring(0,fileName.indexOf("."));
                //设置文件路径
                File file = new File(filepath.replace(localFileUrlPrefix,localFilePath));
                if (file.exists()) {
    
                    //设置授权包的名字，date为时间戳
                    String downloadName =  "授权包"+String.valueOf(new Date().getTime()) + ".txt";
    
                    //返回浏览器的版本号、类型
                    String agent = request.getHeader("USER-AGENT");
                    try {
                        //针对IE或者以IE为内核的浏览器：
                        if (agent.contains("MSIE") || agent.contains("Trident")) {
                            downloadName = java.net.URLEncoder.encode(downloadName, "UTF-8");
                        } else {
                            //非IE浏览器的处理：
                            downloadName = new String(downloadName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    response.setContentType("application/force-download");// 设置强制下载不打开
                    response.setContentLength((int)file.length());
                    response.setHeader("Content-Disposition", "attachment;fileName=\"" + downloadName + "\"");
                    byte[] buffer = new byte[1024];
                    FileInputStream fis = null;
                    BufferedInputStream bis = null;
                    try {
                        fis = new FileInputStream(file);
                        bis = new BufferedInputStream(fis);
                        OutputStream os = response.getOutputStream();
                        int i = bis.read(buffer);
                        while (i != -1) {
                            os.write(buffer, 0, i);
                            i = bis.read(buffer);
                        }
                        return "";
                    } catch (Exception e) {
                        log.error("下载文件失败1，失败原因：{}",e);
                    } finally {
                        if (bis != null) {
                            try {
                                bis.close();
                            } catch (IOException e) {
                                log.error("下载文件失败2，失败原因：{}",e);
                            }
                        }
                        if (fis != null) {
                            try {
                                fis.close();
                            } catch (IOException e) {
                                log.error("下载文件失败3，失败原因：{}",e);
                            }
                        }
                    }
                }else {
                    log.error("找不到文件"+filepath.replace(localFileUrlPrefix,localFilePath));
                }
            }
            return "下载失败";
        }