Android中Http請求類的封裝

在Android的網路開發中，會常用到Http請求，為了避免代碼的重複編寫，我們要學會封裝一個Http請求類。

方法1：

public class Network {public String  makeHttpRequest(String url, List<NameValuePair> params) {try{ .............}catch (JSONException e) {         e.printStackTrace();    }    }}

首先在makeHttpResquest 的方法中建立HTTP Post聯機

DefaultHttpClient httpClient = new DefaultHttpClient();

new 一個新的httppost對象

HttpPost httpPost = new HttpPost(url);

佈建要求時候的編碼格式

httpPost.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));

執行請求

HttpResponse httpResponse = httpClient.execute(httpPost);HttpEntity httpEntity = httpResponse.getEntity();is = httpEntity.getContent();        

利用BufferedReader擷取輸入資料流

BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));StringBuilder sb = new StringBuilder();String line = null;while ((line = reader.readLine()) != null) {        sb.append(line + "\n");        }is.close();

return line;

當然這中間要捕獲各種異常。最後當我們需要用的時候 執行個體化出一個就行了。

Network net=new Network();net.makeHttpRequest(url_up,params);

方法2：

只對url進行請求,這個執行個體在我用Dom解析XML檔案時候用到了:

public String getXmlFromUrl(String url) {        String xml = null;        try {            // defaultHttpClient            DefaultHttpClient httpClient = new DefaultHttpClient();            HttpPost httpPost = new HttpPost(url);            HttpResponse httpResponse = httpClient.execute(httpPost);            HttpEntity httpEntity = httpResponse.getEntity();            xml = EntityUtils.toString(httpEntity,"utf-8");        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        } catch (ClientProtocolException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        // return XML        return xml;    }    

跟方法一不同的是，這裡用到了 EntityUtils 這個類，直接獲得httpEntity。