Android實戰之HttpClient

最近在看Android的開發，其中用到了HttpClient來提交或者獲取server端的數據，但是Android自帶的API還是有點不好用，所以自己根據自己的需要就做了一個包裝，如下：

 

HttpConnectionUtil類是一個工具類，其中提供了同步和異步方法，並且目前是支持http的Get和Post方法

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.util.ArrayList; import java.util.List; import java.util.Map; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.NameValuePair; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.methods.HttpUriRequest; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import android.os.Handler; import android.util.Log; public class HttpConnectionUtil { public static enum HttpMethod {GET, POST} public void asyncConnect(final String url, final HttpMethod method, final HttpConnectionCallback callback) { asyncConnect(url, null, method, callback); } public void syncConnect(final String url, final HttpMethod method, final HttpConnectionCallback callback) { syncConnect(url, null, method, callback); } public void asyncConnect(final String url, final Map<String, String> params, final HttpMethod method, final HttpConnectionCallback callback) { Handler handler = new Handler(); Runnable runnable = new Runnable() { public void run() { syncConnect(url, params, method, callback); } }; handler.post(runnable); } public void syncConnect(final String url, final Map<String, String> params, final HttpMethod method, final HttpConnectionCallback callback) { String json = null; BufferedReader reader = null; try { HttpClient client = new DefaultHttpClient(); HttpUriRequest request = getRequest(url, params, method); HttpResponse response = client.execute(request); if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); StringBuilder sb = new StringBuilder(); for (String s = reader.readLine(); s != null; s = reader.readLine()) { sb.append(s); } json = sb.toString(); } } catch (ClientProtocolException e) { Log.e("HttpConnectionUtil", e.getMessage(), e); } catch (IOException e) { Log.e("HttpConnectionUtil", e.getMessage(), e); } finally { try { if (reader != null) { reader.close(); } } catch (IOException e) { // ignore me } } callback.execute(json); } private HttpUriRequest getRequest(String url, Map<String, String> params, HttpMethod method) { if (method.equals(HttpMethod.POST)) { List<NameValuePair> listParams = new ArrayList<NameValuePair>(); if (params != null) { for (String name : params.keySet()) { listParams.add(new BasicNameValuePair(name, params.get(name))); } } try { UrlEncodedFormEntity entity = new UrlEncodedFormEntity(listParams); HttpPost request = new HttpPost(url); request.setEntity(entity); return request; } catch (UnsupportedEncodingException e) { // Should not come here, ignore me. throw new java.lang.RuntimeException(e.getMessage(), e); } } else { if (url.indexOf("?") < 0) { url += "?"; } if (params != null) { for (String name : params.keySet()) { url += "&" + name + "=" + URLEncoder.encode(params.get(name)); } } HttpGet request = new HttpGet(url); return request; } } }  

 

 

HttpConnectionCallback類是一個回調類，用來處理請求完畢后的邏輯。

public interface HttpConnectionCallback { /** * Call back method will be execute after the http request return. * @param response the response of http request. * The value will be null if any error occur. */ void execute(String response); }