如何使用resttemplate下载文件答案

【问题标题】：how to downlod file using resttemplate如何使用resttemplate下载文件
【发布时间】：2022-01-28 11:10:42
【问题描述】：

        String uri = "URL";
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(new ByteArrayHttpMessageConverter());    
        HttpHeaders headers = new HttpHeaders();
        headers.setAccept(Arrays.asList(MediaType.APPLICATION_OCTET_STREAM));
        HttpEntity<String> entity = new HttpEntity<String>(headers);

        ResponseEntity<byte[]> response = restTemplate.exchange(uri, HttpMethod.GET, entity, byte[].class, "1");

我收到类似的响应-> 我想下载 (935436242330664960_pratikpopo.txt) 这个文件。 有什么方法可以下载这个文件

【问题讨论】：

看看这是否有帮助 - stackoverflow.com/a/26615303/17981941
欢迎来到 StackOverflow。您能否详细说明什么不起作用？
我收到此回复，但我无法下载 pratikpopo.txt 文件下载。我的动机是将此文件存储在本地机器中我们应该怎么做

标签： java spring-boot rest resttemplate

【解决方案1】：

{
        URL link = new URL("your full url http://........");
        InputStream in = new BufferedInputStream(link.openStream());
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buf = new byte[1024];
        int n = 0;
        while (-1!=(n=in.read(buf)))
        {
           out.write(buf, 0, n);
        }
        out.close();
        in.close();
        byte[] response = out.toByteArray();
        
        FileOutputStream fos = new FileOutputStream("C:/download-file/YourFileName.txt");
        fos.write(response);
        fos.close();
 }

【讨论】：

【解决方案2】：

  @RequestMapping(value = "/download3/{path}", method = RequestMethod.GET)
    public String downloadFile4( @RequestParam("file_name") String path) throws IOException
    {
        String uri = "File Path-URL(location wehere your file is stored on server)";
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(new ByteArrayHttpMessageConverter());    
        HttpHeaders headers = new HttpHeaders();
        headers.setAccept(Arrays.asList(MediaType.APPLICATION_OCTET_STREAM));
        HttpEntity<String> entity = new HttpEntity<String>(headers);

        ResponseEntity<byte[]> response = restTemplate.exchange(uri, HttpMethod.GET, entity, byte[].class, "1");
        
        URL furl = new URL(uri);
        ReadableByteChannel rbc = Channels.newChannel(furl.openStream());
        FileOutputStream fos = new FileOutputStream("C:/download-file/"+ response.getHeaders().getContentDisposition().getFilename());
        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
        
        return "file downloaded";
    }

【讨论】：