如何停止HttpURLConnection.getInputStream（）？

问题描述

下面是我的code：

 私人HttpURLConnection的连接;
私人InputStream为;公共无效上传（）{
    尝试{
        网址URL =新的URL（URLPath）;
        连接=（HttpURLConnection类）url.openConnection（）;
        connection.setConnectTimeout（30000）;
        connection.setReadTimeout（30000）;
        connection.setDoInput（真）;
        connection.setUseCaches（假）;
        connection.connect（）;
        是= connection.getInputStream（）;
    }赶上（例外五）{
        e.printStackTrace（）;
    }
}公共无效stopupload（）{
    连接= NULL;
    是=无效;
}
 

当我上传的文件，该行是= connection.getInputStream（）; 会花很多的时间去回复。所以我想实现一个停止功能为 stopupload（）。但是，如果我叫 stopupload（），而code是在处理行为= connection.getInputStream（）; ，它仍然需要等待答复。

我要立即停止执行，同时等待 stopupload（）。我该怎么办呢？

解决方案

Starting from HoneyComb, all network operations are not allowed to be executed over main thread. To avoid getting NetworkOnMainThreadException, you may use Thread or AsyncTask.

Below code gives the user to stop uploading after 2 seconds, but you can modify the sleep times (should be less than 5 seconds) accordingly.

upload:

public void upload() {
    try {
        URL url = new URL(URLPath);
        connection = (HttpURLConnection) url.openConnection();
        connection.setConnectTimeout(30000);
        connection.setReadTimeout(30000);
        connection.setDoInput(true);
        connection.setUseCaches(false);
        connection.connect();
        // run uploading activity within a Thread
        Thread t = new Thread() {
            public void run() {
                is = connection.getInputStream();
                if (is == null) {
                    throw new RuntimeException("stream is null");
                }
                // sleep 2 seconds before "stop uploading" button appears
                mHandler.postDelayed(new Runnable() {
                    public void run() {
                        mBtnStop.setVisibility(View.VISIBLE);
                    }
                }, 2000);
            }
        };
        t.start();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (is != null) {
            try {
                is.close();
            } catch (IOException e) {
            }
        }
        if (connection != null) {
            connection.disconnect();
        }
    }
}

onCreate:

@Override
public void onCreate(Bundle savedInstanceState) {
    // more codes...
    Handler mHandler = new Handler();
    mBtnStop = (Button) findViewById(R.id.btn_stop);
    mBtnStop.setBackgroundResource(R.drawable.stop_upload);
    mBtnStop.setOnClickListener(mHandlerStop);
    mBtnStop.setVisibility(View.INVISIBLE);

    View.OnClickListener mHandlerStop = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            stopUpload(); // called when "stop upload" button is clicked
        }
    };

    // more codes...
}

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