Question

我有一个要求，我必须创建一个流休息api来读取文件。我们正在构建类似于 cat linux命令的东西。

因此，如果用户键入 ccat filename |然后我们必须保持流打开并以256字节的块读出内容，并等待资源从客户端关闭。

我创建了一个POC。其余的api代码看起来像这样 -

@Produces(MediaType.APPLICATION_OCTET_STREAM)
@RequestMapping(method = RequestMethod.GET, value = "stream")
public void hello(@Context HttpServletRequest request, @Context HttpServletResponse response)
  throws InterruptedException {
String content = "This is the text content";
ServletOutputStream outputStream = null;
try {
  for(int i=0;i<100;i++){
    content = content + i;
    final byte[] bytes = content.getBytes();
    outputStream = response.getOutputStream();
    response.setContentType("application/octet-stream");
    response.setStatus(200);
    outputStream.write(bytes);
    Thread.sleep(1000l);
    outputStream.flush();
  }

  outputStream.close();
} catch (IOException e) {
  e.printStackTrace();
}

客户端代码如下 -

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class NetClientGet {
public static void main(String[] args) {

try {

  URL url = new URL("http://localhost:6868/api/stream");
  HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  conn.setRequestMethod("GET");
  conn.setRequestProperty("Accept", "application/json");
  if (conn.getResponseCode() != 200) {
    throw new RuntimeException("Failed : HTTP error code : "
        + conn);
  }
  BufferedReader br = new BufferedReader(new InputStreamReader(
      (conn.getInputStream())));
  String output;
  System.out.println("Output from Server .... \n");
  while ((output = br.readLine()) != null) {
    System.out.println(output);
  }
  conn.disconnect();
} catch (MalformedURLException e) {
  e.printStackTrace();
} catch (IOException e) {
  e.printStackTrace();
}
}
}

这工作正常，但问题是它不是一次性写入字节块，而是整个内容。我正在调用flush（）所以我希望它会在每次调用flush（）时将块发送到客户端，但这似乎并没有发生。它在调用close（）后发送给客户端。我该如何解决这个问题？

Streaming Rest Api - 以数据块的形式将数据发送到客户端，来自restful api

0 个答案: