HttpClient

發送get請求

創建一個客戶端對象

    HttpClient client = new DefaultHttpClient();

創建一個get請求對象

    HttpGet hg = new HttpGet(path);

發送get請求，建立連接，返回響應頭對象

    HttpResponse hr = hc.execute(hg);

獲取狀態行對象，獲取狀態碼，如果為200則說明請求成功

        if(hr.getStatusLine().getStatusCode() == 200){
            //拿到服務器返回的輸入流
            InputStream is = hr.getEntity().getContent();
            String text = Utils.getTextFromStream(is);
        }

發送post請求

        //創建一個客戶端對象
        HttpClient client = new DefaultHttpClient();
        //創建一個post請求對象
        HttpPost hp = new HttpPost(path);

往post對象裡放入要提交給服務器的數據

        //要提交的數據以鍵值對的形式存在BasicNameValuePair對象中
        List parameters = new ArrayList();
        BasicNameValuePair bnvp = new BasicNameValuePair(name, name);
        BasicNameValuePair bnvp2 = new BasicNameValuePair(pass, pass);
        parameters.add(bnvp);
        parameters.add(bnvp2);
        //創建實體對象，指定進行URL編碼的碼表
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters, utf-8);
        //為post請求設置實體
        hp.setEntity(entity);

---

異步HttpClient框架

 

發送get請求

        //創建異步的httpclient對象
        AsyncHttpClient ahc = new AsyncHttpClient();
        //發送get請求
        ahc.get(path, new MyHandler());

注意AsyncHttpResponseHandler兩個方法的調用時機

        class MyHandler extends AsyncHttpResponseHandler{

            //http請求成功，返回碼為200，系統回調此方法
            @Override
            public void onSuccess(int statusCode, Header[] headers,
                    //responseBody的內容就是服務器返回的數據
                    byte[] responseBody) {
                Toast.makeText(MainActivity.this, new String(responseBody), 0).show();

            }

            //http請求失敗，返回碼不為200，系統回調此方法
            @Override
            public void onFailure(int statusCode, Header[] headers,
                    byte[] responseBody, Throwable error) {
                Toast.makeText(MainActivity.this, 返回碼不為200, 0).show();

            }

        }

發送post請求

使用RequestParams對象封裝要攜帶的數據

        //創建異步httpclient對象
        AsyncHttpClient ahc = new AsyncHttpClient();
        //創建RequestParams封裝要攜帶的數據
        RequestParams rp = new RequestParams();
        rp.add(name, name);
        rp.add(pass, pass);
        //發送post請求
        ahc.post(path, rp, new MyHandler());