HTTP通訊（HttpURLConnection）

 

Android發送HTTP請求有兩種，HttpURLConnection和HttpClient

用法：

1.獲取HttpURLConnection實例

new一個URL對象，傳入一個網絡地址；而後調用openConnection方法

 

2.設置HTTP請求的方法

經常使用的方法有兩種：GET和POST方法，GET：從服務器獲取數據；POST：發送數據給服務器

 

3.設置一些東西

好比設置鏈接超時，讀取超時，服務器但願獲得的消息頭等

 

4.getInputStream獲取服務器返回的輸入流

 

5.對輸入流進行讀取

 

6.disconnect關閉HTTP鏈接

---

private void sendResquestWithURLConnection(){
new Thread(new Runnable() {
@Override
public void run() {
            HttpURLConnection connection = null;
try{
                URL url = new URL("http://www.baidu.com");
                connection = (HttpURLConnection) url.openConnection();

                connection.setRequestMethod("GET");

                connection.setConnectTimeout(8000);
                connection.setReadTimeout(8000);

                InputStream in = connection.getInputStream();

                BufferedReader reader = new BufferedReader(new InputStreamReader(in));
                StringBuilder response = new StringBuilder();
                String line;
while((line = reader.readLine()) != null){
                    response.append(line);
                }
                Message message = new Message();
                message.what = SHOW_RESPONSE;

                message.obj = response.toString();
handler.sendMessage(message);
            }catch(Exception e){
                e.printStackTrace();
            }finally{
if (connection != null){
                    connection.disconnect();
                }
            }
        }
    }).start();

---

private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what){
case SHOW_RESPONSE:
                String response = (String)msg.obj;
              responseText.setText(response);
        }

    }
};

---

@Override

protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    sendRequest = (Button) findViewById(R.id.send_request);    responseText = (TextView) findViewById(R.id.response_text);    sendRequest.setOnClickListener(this);}@Overridepublic void onClick(View v) {if (v.getId() == R.id.send_request){        sendResquestWithURLConnection();    }}