java - 将 InputStream 作为参数传递给 Web 服务

Question

我正在尝试上传文件，但我不是通过 html 表单上传文件。无法使用 QueryParam 和 PathParam。那么谁能告诉我如何传递流。

我的 HttPClient 看起来像:

try
    {
        HttpClient httpclient = new DefaultHttpClient();
        InputStream stream=new FileInputStream(new File("C:/localstore/ankita/Desert.jpg"));
        String url="http://localhost:8080/Cloud/webresources/fileupload";
        HttpPost httppost = new HttpPost(url);
        HttpResponse response = httpclient.execute(httppost);
    }
    catch(Exception e){}

我的网络服务类看起来有点像:

@Path("/fileupload")
public class UploadFileService {

@POST
@Consumes(MediaType.APPLICATION_OCTET_STREAM)

public Response uploadFile(InputStream in) throws IOException
{     
    String uploadedFileLocation = "c://filestore/Desert.jpg" ;

    // save it
    saveToFile(in, uploadedFileLocation);

    String output = "File uploaded via Jersey based RESTFul Webservice to: " + uploadedFileLocation;

    return Response.status(200).entity(output).build();

}

// save uploaded file to new location
private void saveToFile(InputStream uploadedInputStream,String uploadedFileLocation) 
{
    try {
        OutputStream out = null;
        int read = 0;
        byte[] bytes = new byte[1024];

        out = new FileOutputStream(new File(uploadedFileLocation));
        while ((read = uploadedInputStream.read(bytes)) != -1) 
        {
            out.write(bytes, 0, read);
        }
        out.flush();
        out.close();
    } catch (IOException e) 
    {
        e.printStackTrace();
    }

}

}

有人可以帮忙吗？

 String url="http://localhost:8080/Cloud/webresources/fileupload";
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(url);
        InputStreamEntity reqEntity = new InputStreamEntity(new FileInputStream(new File("C:/localstore/ankita/Desert.jpg")), -1);
        reqEntity.setContentType("binary/octet-stream");
        reqEntity.setChunked(true); // Send in multiple parts if needed
        httppost.setEntity(reqEntity);
        HttpResponse response = httpclient.execute(httppost);   

网络服务会是什么样子？

Answer 1

你不能那样做。您无法在 HTTP 请求中传递流，因为流不可序列化。

执行此操作的方法是创建一个 HttpEntity 来包装流(例如 InputStreamEntity)，然后将其附加到 HttpPOST使用setEntity 对象。然后发送 POST，客户端将从您的流中读取并将字节作为请求的“POST 数据”发送。