发送字节数组并通过REST Web服务接收字符串

Question

在我的Spring Rest Web服务中我发送一个文件（甚至是大尺寸）作为字节数组，但是当我收到信息时，该对象是一个String，所以当我从目的是字节[]我收到以下错误：

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

的originl文件通过

Files.readAllBytes(Paths.get(path))

转换和这byte[]填充在一个对象与对象类型的字段result 。 当客户端取回该对象和它得到result类采用铸造到它出现在上面的异常byte[]，这是客户机代码

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

如果我使用强制转换将字符串转换为字节，则文件内容与原始文件不同。我不在乎的文件类型，文件的内容，我只有从服务器复制到客户端目录 我该怎么办谢谢

服务器类：

@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); 
     }  
    } 

与文件传输是：

public class FileTransfer { 

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

客户端类：

@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

所以客户应该是这样的

@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

我相信内容类型是这里text/plain，因此该文件的内容是纯文本。只需从反应生成的字节数组：

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