Spring : get response as Multipart File from REST WebService

Question

我正在使用 Spring 4.0 为 RESTFUL Web 服务创建 POC。 要求是从 REST WEB-Service 接收 MultipartFile 作为响应。

REST 服务 Controller

@RequestMapping(value="/getcontent/file", method=RequestMapping.post)
public MultipartFile getMultipartAsFileAsObject() {

    File file = new File("src/test/resources/input.docx");
    FileInputStream input = new FileInputStream(file);
    MultipartFile multipartFile = new MockMultipartFile("file",file.getName(),
                                 "application/docx", IOUtils.toByteArray(input));

    return multipartFile        
}

我也使用第三方客户端和 Apache Http 客户端调用此服务。请看看输出。

使用第三方 REST 客户端，即。 postman

输出看起来像 Json -

{
    "name" : "file",
    "originalfilename" : "sample.docx",
    "contentType" : "application/docx",
    "content" : [
                82,
                101,
                97,
                100,
                101,    
                32,
                32,
                .
                .
                .
                .
                .
            ]  
}

Apache HTTP 客户端示例代码

private static void executeClient() {
HttpClient client = new DefaultHttpClient();
HttpPost postReqeust = new HttpPost(SERVER_URI);

try{
    // Set Various Attributes

    HttpResponse response = client.execute(postReqeust) ;

    //Verify response if any
    if (response != null)
    {
        InputStream inputStream = response.getEntity().getContent();
        byte[] buffer = new byte[inputStream.available()];
        inputStream.read(buffer);

        OutputStream outputStream = new FileOutputStream
                                   (new File("src/main/resource/sample.docx"));
        outputStream.write(buffer);
        outputStream.flush();
        outputStream.close();
    }

}
catch(Exception ex){
    ex.printStackTrace();
}

Apache Http 客户端的输出

文件正在创建，但它是空的。 (0 字节)。

Answer 1

 I found some interesting answers from multiple stackoverflow questions.  Links are given below

file downloading in restful web services

what's the correct way to send a file from REST web service to client?

For Sending single file : (copied from above sources)

@GET
@Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response getFile() {
  File file = ... // Initialize this to the File path you want to serve.
  return Response.ok(file, MediaType.APPLICATION_OCTET_STREAM)
      .header("Content-Disposition", "attachment; filename=\"" + file.getName() + "\"" ) //optional
      .build();
}

用于发送 Zip 文件:(从上述来源复制)

1)方法第一:

您可以使用上述方法发送任何文件/Zip。

private static final String FILE_PATH = "d:\\Test2.zip";
@GET
@Path("/get")
@Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response getFile() {
    File file = new File(FILE_PATH);
    ResponseBuilder response = Response.ok((Object) file);
    response.header("Content-Disposition", "attachment; filename=newfile.zip");
    return response.build();

}

2)方法二:

@GET
@Path("/get") 
@Produces(MediaType.APPLICATION_OCTET_STREAM)
public StreamingOutput helloWorldZip() throws Exception {
    return new StreamingOutput(){
    @Override
        public void write(OutputStream arg0) throws IOException, WebApplicationException {
            // TODO Auto-generated method stub
            BufferedOutputStream bus = new BufferedOutputStream(arg0);
            try {
                Thread.currentThread().getContextClassLoader().getResource("");
                File file = new File("d:\\Test1.zip");
                FileInputStream fizip = new FileInputStream(file);
                byte[] buffer2 = IOUtils.toByteArray(fizip);
                bus.write(buffer2);
            } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            }
        }
    };
}