HttpClient in Android practice

Recently, I am reading Android development. HttpClient is used to submit or obtain server-side data. However, the API provided by Android is still a little unavailable, so I made a package according to my own needs, as shown below:

 

The HttpConnectionUtil class is a tool class that provides synchronous and asynchronous methods, and currently supports http Get and Post methods.

Import java. io. bufferedReader; <br/> import java. io. IOException; <br/> import java. io. inputStreamReader; <br/> import java. io. unsupportedEncodingException; <br/> import java.net. URLEncoder; <br/> import java. util. arrayList; <br/> import java. util. list; <br/> import java. util. map; <br/> import org. apache. http. httpResponse; <br/> import org. apache. http. httpStatus; <br/> import org. apache. http. nameValuePair; <br /> Import org. apache. http. client. clientProtocolException; <br/> import org. apache. http. client. httpClient; <br/> import org. apache. http. client. entity. urlEncodedFormEntity; <br/> import org. apache. http. client. methods. httpGet; <br/> import org. apache. http. client. methods. httpPost; <br/> import org. apache. http. client. methods. httpUriRequest; <br/> import org. apache. http. impl. client. defaultHttpClient; <br/> imp Ort org. apache. http. message. basicNameValuePair; <br/> import android. OS. handler; <br/> import android. util. log; <br/> public class HttpConnectionUtil {<br/> public static enum HttpMethod {GET, POST} </p> <p> public void asyncConnect (final String url, final HttpMethod method, final HttpConnectionCallback callback) {<br/> asyncConnect (url, null, method, callback ); <br/>}</p> <p> public void syncConnect (fina L String url, final HttpMethod method, final HttpConnectionCallback callback) {<br/> syncConnect (url, null, method, callback ); <br/>}</p> <p> public void asyncConnect (final String url, final Map <String, String> params, <br/> final HttpMethod method, final HttpConnectionCallback callback) {<br/> Handler handler = new Handler (); <br/> Runnable runnable = new Runnable () {<br/> public void run () {<br/> sy NcConnect (url, params, method, callback); <br/>}< br/>}; <br/> handler. post (runnable); <br/>}</p> <p> public void syncConnect (final String url, final Map <String, String> params, <br/> final HttpMethod method, final HttpConnectionCallback callback) {<br/> String json = null; <br/> BufferedReader reader = null; </p> <p> try {<br/> HttpClient client = new DefaultHttpClient (); <br/> HttpUriRequest request = ge TRequest (url, params, method); <br/> HttpResponse response = client.exe cute (request); <br/> if (response. getStatusLine (). getStatusCode () = HttpStatus. SC _ OK) {<br/> reader = new BufferedReader (new InputStreamReader (response. getEntity (). getContent (); <br/> StringBuilder sb = new StringBuilder (); <br/> for (String s = reader. readLine (); s! = Null; s = reader. readLine () {<br/> sb. append (s); <br/>}< br/> json = sb. toString (); <br/>}< br/>} catch (ClientProtocolException e) {<br/> Log. e ("HttpConnectionUtil", e. getMessage (), e); <br/>}catch (IOException e) {<br/> Log. e ("HttpConnectionUtil", e. getMessage (), e); <br/>}finally {<br/> try {<br/> if (reader! = Null) {<br/> reader. close (); <br/>}< br/>} catch (IOException e) {<br/> // ignore me <br/>}< br/> callback.exe cute (json ); <br/>}</p> <p> private HttpUriRequest getRequest (String url, Map <String, String> params, HttpMethod) {<br/> if (method. equals (HttpMethod. POST) {<br/> List <NameValuePair> listParams = new ArrayList <NameValuePair> (); <br/> if (params! = Null) {<br/> for (String name: params. keySet () {<br/> listParams. add (new BasicNameValuePair (name, params. get (name); <br/>}< br/> try {<br/> UrlEncodedFormEntity entity = new UrlEncodedFormEntity (listParams ); <br/> HttpPost request = new HttpPost (url); <br/> request. setEntity (entity); <br/> return request; <br/>} catch (UnsupportedEncodingException e) {<br/> // shocould not come here, ignore Me. <br/> throw new java. lang. runtimeException (e. getMessage (), e); <br/>}< br/>} else {<br/> if (url. indexOf ("? ") <0) {<br/> url + = "? "; <Br/>}< br/> if (params! = Null) {<br/> for (String name: params. keySet () {<br/> url + = "&" + name + "=" + URLEncoder. encode (params. get (name); <br/>}< br/> HttpGet request = new HttpGet (url); <br/> return request; <br/>}< br/> 

 

 

The HttpConnectionCallback class is a callback class used to process the logic after the request is completed.

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