Android使用获取HTML

public byte[] readStream(InputStream inputStream) throws Exception 
    {
        byte[] buffer = new byte[1024];
        int len = -1;
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

        while ((len = inputStream.read(buffer)) != -1) 
        {
            byteArrayOutputStream.write(buffer, 0, len);
        }

        inputStream.close();
        byteArrayOutputStream.close();
        return byteArrayOutputStream.toByteArray();
    }

    public String testGetHtml(String urlpath) throws Exception 
    {
        URL url = new URL(urlpath);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(1000);//超时时间1秒钟
        conn.setRequestMethod("GET");

        if (conn.getResponseCode() == 200) 
        {
            InputStream inputStream = conn.getInputStream();
            byte[] data = readStream(inputStream);
            String html = new String(data);
            return html;
        }
        return "bb";
    }

如果在android4.0以下的版本中，可以直接使用。否则，这部分网络编程就需要使用到多线程，如果不使用多线程就会抛出android.os.NetworkOnMainThreadException异常。下面是多线程的代码

private static final int MSG_SUCCESS = 0;// 获取成功的标识
private static final int MSG_FAILURE = 1;// 获取失败的标识

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tx = (TextView) findViewById(R.id.tx);
        html = (Button) findViewById(R.id.Button1);
        html.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                new Thread(){
                    public void run(){
                        try {
                            String testStr="aa";
                            testStr = testGetHtml("http://www.baidu.com/");
                            mHandler.obtainMessage(MSG_SUCCESS, testStr).sendToTarget();
                        } catch (Exception e) {
                            e.printStackTrace();
                            StringWriter sw = new StringWriter();  
                            e.printStackTrace(new PrintWriter(sw, true));  
                            String str = sw.toString();  
                            mHandler.obtainMessage(MSG_FAILURE, str).sendToTarget();
                        }
                    }
                }.start();
            }
        });
        
        
        //HttpGetData();
    }
    private Handler mHandler = new Handler(){
        public void handleMessage(Message msg)
        {
            switch(msg.what)
            {
                case MSG_SUCCESS:
                    tx.setText(msg.obj.toString());break;
                case MSG_FAILURE:
                    tx.setText(msg.obj.toString());break;
            }
        }
    };