本文介绍了如何在J2ME中使用HTTP范围头?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述


  1. 是否可以在HTTP中使用带有HTTP GET请求的范围标头?

  2. 如果是,那么是什么?

我只想从服务器下载指定字节的字节。
即如果我想从0到255下载字节。

I just want to download bytes from server with specified bytes.i.e if I want to download bytes from 0 to 255.

推荐答案

请参阅此示例代码,

      HttpConnection connection = null;
      InputStream inputstream = null;
      try
      {
        connection = (HttpConnection) Connector.open(url); // Enter your URL here.
        //HTTP Request
        connection.setRequestMethod(HttpConnection.GET);
        connection.setRequestProperty("Content-Type","//text plain");
        connection.setRequestProperty("Connection", "close");
        // HTTP Response
        System.out.println("Status Line Code: " + connection.getResponseCode());
        System.out.println("Status Line Message: " + connection.getResponseMessage());
        if (connection.getResponseCode() == HttpConnection.HTTP_OK)
        {
          System.out.println(
            connection.getHeaderField(0)+ " " + connection.getHeaderFieldKey(0));
          System.out.println(
           "Header Field Date: " + connection.getHeaderField("date"));
          String str;
          inputstream = connection.openInputStream();
          int length = (int) connection.getLength();
          if (length != -1)
          {
            byte incomingData[] = new byte[length];
            inputstream.read(incomingData);
            str = new String(incomingData);
          }
          else
          {
            ByteArrayOutputStream bytestream =
                  new ByteArrayOutputStream();
            int ch;
            while ((ch = inputstream.read()) != -1)
            {
              bytestream.write(ch);
            }
            str = new String(bytestream.toByteArray());
            bytestream.close();
          }
          System.out.println(str);
        }
      }
      catch(IOException error)
      {
       System.out.println("Caught IOException: " + error.toString());
      }
      finally
      {
        if (inputstream!= null)
        {
          try
          {
            inputstream.close();
          }
          catch( Exception error)
          {
             /*log error*/
          }
        }
        if (connection != null)
        {
          try
          {
             connection.close();
          }
          catch( Exception error)
          {
             /*log error*/
          }

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07-31 06:32