Android 網絡請求方法

HttpURLConnectionText.java:

public class HttpURLConnectionText extends Activity implements OnClickListener {

	private final static int SUCCESS = 1;
	private final static int FAILE = 0;
	private TextView result;
	private Button send;
	private LoadingDialog loadingDialog;
	private Context mContext;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		initData();
	}

	private void initData() {
		mContext = this;
		result = (TextView) findViewById(R.id.result);
		send = (Button) findViewById(R.id.send);
		send.setOnClickListener(this);
	}

	private Handler mHandler = new Handler() {
		public void handleMessage(Message msg) {
			String response;
			if(loadingDialog != null && loadingDialog.isShowing()){
				loadingDialog.dismiss();
			}
			switch (msg.what) {
			case SUCCESS:
				response = msg.obj.toString();
				result.setText(response);
				break;
			case FAILE:
				response = msg.obj.toString();
				result.setText(response);
				break;
			}
		};
	};

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.send:
			loadingDialog = new LoadingDialog(mContext);
			loadingDialog.setCancel(false);
			loadingDialog.show();
			startSend();
			break;
		}
	}

	private void startSend() {
		new Thread(new Runnable() {

			@Override
			public void run() {
				HttpURLConnection connection = null;
				try {
					URL url = new URL("http://www.baidu.com/");
					// 調用URL的openConnection()方法，得到HttpURLConnection的實例
					connection = (HttpURLConnection) url.openConnection();
					// 設置HTTP請求方法為GET，一般GET為從服務器獲取數據，POST為提交數據給服務器
					connection.setRequestMethod("GET");
					// 設置連接超時的毫秒數
					connection.setConnectTimeout(8000);
					// 設置讀取超時的毫秒數
					connection.setReadTimeout(8000);
					// 獲取服務器返回的輸入流
					InputStream in = connection.getInputStream();
					// 對獲取到的輸入流進行讀取
					BufferedReader reader = new BufferedReader(
							new InputStreamReader(in));
					String response = "", line;
					while ((line = reader.readLine()) != null) {
						response += line;
					}
					//獲取成功，發送成功信息
					Message message = new Message();
					message.what = SUCCESS;
					message.obj = response;
					mHandler.sendMessage(message);
				} catch (Exception e) {
					//發送失敗信息
					Message message = new Message();
					message.what = FAILE;
					message.obj = "請求失敗";
					mHandler.sendMessage(message);
					e.printStackTrace();
				} finally {
					if (connection != null) {
						//如果connection為null，則關閉它
						connection.disconnect();
					}
				}
			}

		}).start();
	}

}

HttpClientText.java:

public class HttpClientText extends Activity implements OnClickListener {

	private final static int SUCCESS = 1;
	private final static int FAILE = 0;
	private TextView result;
	private Button send;
	private LoadingDialog loadingDialog;
	private Context mContext;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		initData();
	}

	private void initData() {
		mContext = this;
		result = (TextView) findViewById(R.id.result);
		send = (Button) findViewById(R.id.send);
		send.setOnClickListener(this);
	}

	private Handler mHandler = new Handler() {
		public void handleMessage(Message msg) {
			String response;
			if(loadingDialog != null && loadingDialog.isShowing()){
				loadingDialog.dismiss();
			}
			switch (msg.what) {
			case SUCCESS:
				response = msg.obj.toString();
				result.setText(response);
				break;
			case FAILE:
				response = msg.obj.toString();
				result.setText(response);
				break;
			}
		};
	};

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.send:
			loadingDialog = new LoadingDialog(mContext);
			loadingDialog.setCancel(false);
			loadingDialog.show();
			startSend();
			break;
		}
	}

	private void startSend() {
		new Thread(new Runnable() {

			@Override
			public void run() {
				try {
					//因為HttpClient是一個接口，所以用DefaultHttpClient()方法創建一個實例
					HttpClient httpClient = new DefaultHttpClient();
					//創建HttpGet對象並傳入網絡地址，並調用HttpClient的execute方法發送GET請求
					HttpGet httpGet = new HttpGet("http://www.baidu.com");
					HttpResponse httpResponse = httpClient.execute(httpGet);
					//先取出服務器返回的狀態碼，如果是200則說明請求響應成功，這裡可以自行判斷獲得的狀態碼
					//是什麼來判斷是否成功或是什麼失敗
					if(httpResponse.getStatusLine().getStatusCode() == 200){
						//請求響應成功,調用getEntity()方法獲取HttpEntity實例並轉換成字符串
						HttpEntity entity = httpResponse.getEntity();
						String response = EntityUtils.toString(entity, "utf-8");

						//獲取成功，發送成功信息
						Message message = new Message();
						message.what = SUCCESS;
						message.obj = response;
						mHandler.sendMessage(message);
					}
				} catch (Exception e) {
					//發送失敗信息
					Message message = new Message();
					message.what = FAILE;
					message.obj = "請求失敗";
					mHandler.sendMessage(message);
					e.printStackTrace();
				}
			}

		}).start();
	}

}