發送字節數組並通過REST Web服務接收字符串

Question

在我的Spring Rest Web服務中我發送一個文件（甚至是大尺寸）作爲字節數組，但是當我收到信息時，該對象是一個String，所以當我從目的是字節[]我收到以下錯誤：

java.lang.ClassCastException: java.lang.String cannot be cast to [B

的originl文件通過

Files.readAllBytes(Paths.get(path))

轉換和這byte[]填充在一個對象與對象類型的字段result 。 當客戶端取回該對象和它得到result類採用鑄造到它出現在上面的異常byte[]，這是客戶機代碼

Files.write(Paths.get("test.txt"),((byte[])response.getResult()));

如果我使用強制轉換將字符串轉換爲字節，則文件內容與原始文件不同。我不在乎的文件類型，文件的內容，我只有從服務器複製到客戶端目錄 我該怎麼辦謝謝

服務器類：

@Override 
    @RequestMapping(value = "/", method = RequestMethod.GET) 
    public @ResponseBody Response getAcquisition(@RequestParam(value="path", defaultValue="/home") String path){ 
     try { 
      byte[] file = matlabClientServices.getFile(path); 
      if (file!=null){ 
       FileTransfer fileTransfer= new FileTransfer(file, Paths.get(path).getFileName().toString()); 
       return new Response(true, true, fileTransfer, null); 
      } 
      else 
       return new Response(false, false, "File doesn't exist!", null);   
     } catch (Exception e) { 
      ErrorResponse errorResponse= ErrorResponseBuilder.buildErrorResponse(e); 
      LOG.error("Threw exception in MatlabClientControllerImpl::getAcquisition :" + errorResponse.getStacktrace()); 
      return new Response(false, false, "Error during file retrieving!", errorResponse); 
     }  
    } 

與文件傳輸是：

public class FileTransfer { 

     private byte[] content; 
     private String name; 
..get and set 

客戶端類：

@RequestMapping(value = "/", method = RequestMethod.GET) 
public @ResponseBody Response getFile(@RequestParam(value="path", defaultValue="/home") String path){ 
    RestTemplate restTemplate = new RestTemplate(); 
    Response response = restTemplate.getForObject("http://localhost:8086/ATS/client/file/?path={path}", Response.class, path); 
    if (response.isStatus() && response.isSuccess()){ 
     try { 
      @SuppressWarnings("unchecked") 
      LinkedHashMap<String,String> result= (LinkedHashMap<String,String>)response.getResult(); 
      //byte[] parseBase64Binary = DatatypeConverter.parseBase64Binary((String)fileTransfer.getContent()); 
      Files.write(Paths.get(result.get("name")), DatatypeConverter.parseBase64Binary(result.get("content"))); 
      return new Response(true, true, "Your file has been written!", null); 
      } catch (IOException e) { 
      return new Response(true, true, "Error writing your file!!", null); 
     } 
    } 
    return response; 
} 

Answer 1

所以客戶應該是這樣的

@RequestMapping(value = "/test/", method = RequestMethod.GET) 
    public Response getFileTest(@RequestParam(value="path", defaultValue="/home") String path){ 
     RestTemplate restTemplate = new RestTemplate(); 
     Response response = restTemplate.getForObject("http://localhost:8086/ATS/client/file/?path={path}", Response.class, path); 
     if (response.isStatus() && response.isSuccess()){ 
      try { 
       byte[] parseBase64Binary = DatatypeConverter.parseBase64Binary((String)response.getResult()); 
       Files.write(Paths.get("test.txt"),parseBase64Binary); 
      } catch (IOException e) { 
      } 
     } 
     return response; 
    } 

Answer 2

我相信內容類型是這裏text/plain，因此該文件的內容是純文本。只需從反應生成的字節數組：

Files.write(Paths.get("test.txt"),((String)response.getResult()).getBytes());