Android使用获取HTML
1 public byte[] readStream(InputStream inputStream) throws Exception 2 { 3 byte[] buffer = new byte[1024]; 4 int len = -1; 5 ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); 6 7 while ((len = inputStream.read(buffer)) != -1) 8 { 9 byteArrayOutputStream.write(buffer, 0, len); 10 } 11 12 inputStream.close(); 13 byteArrayOutputStream.close(); 14 return byteArrayOutputStream.toByteArray(); 15 } 16 17 public String testGetHtml(String urlpath) throws Exception 18 { 19 URL url = new URL(urlpath); 20 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 21 conn.setConnectTimeout(1000);//超时时间1秒钟 22 conn.setRequestMethod("GET"); 23 24 if (conn.getResponseCode() == 200) 25 { 26 InputStream inputStream = conn.getInputStream(); 27 byte[] data = readStream(inputStream); 28 String html = new String(data); 29 return html; 30 } 31 return "bb"; 32 }
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
1 private static final int MSG_SUCCESS = 0;// 获取成功的标识 2 private static final int MSG_FAILURE = 1;// 获取失败的标识 3 4 protected void onCreate(Bundle savedInstanceState) { 5 super.onCreate(savedInstanceState); 6 setContentView(R.layout.activity_main); 7 tx = (TextView) findViewById(R.id.tx); 8 html = (Button) findViewById(R.id.Button1); 9 html.setOnClickListener(new View.OnClickListener(){ 10 @Override 11 public void onClick(View v) { 12 new Thread(){ 13 public void run(){ 14 try { 15 String testStr="aa"; 16 testStr = testGetHtml("http://www.baidu.com/"); 17 mHandler.obtainMessage(MSG_SUCCESS, testStr).sendToTarget(); 18 } catch (Exception e) { 19 e.printStackTrace(); 20 StringWriter sw = new StringWriter(); 21 e.printStackTrace(new PrintWriter(sw, true)); 22 String str = sw.toString(); 23 mHandler.obtainMessage(MSG_FAILURE, str).sendToTarget(); 24 } 25 } 26 }.start(); 27 } 28 }); 29 30 31 //HttpGetData(); 32 } 33 private Handler mHandler = new Handler(){ 34 public void handleMessage(Message msg) 35 { 36 switch(msg.what) 37 { 38 case MSG_SUCCESS: 39 tx.setText(msg.obj.toString());break; 40 case MSG_FAILURE: 41 tx.setText(msg.obj.toString());break; 42 } 43 } 44 };
