Encapsulation of HTTP request classes in Android

In Android Network Development, HTTP requests are often used. To avoid code duplication, we must learn to encapsulate an HTTP request class.

Method 1:

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

First, create an http post online in the makehttpresquest method.

DefaultHttpClient httpClient = new DefaultHttpClient();

A new httppost object

HttpPost httpPost = new HttpPost(url);

Set the encoding format for the request

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

Execute request

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

Use bufferedreader to obtain the input stream

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;

Of course, various exceptions need to be caught in the middle. Finally, when we need to use it, we can just generate one instance.

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

Method 2:

Only requests the URL. This instance is used when I use Dom to parse XML files:

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;    }    

Different from method 1, entityutils is used here to directly obtain httpentity.