Android's HttpClient

Apache package is a good package for Android networking access and is the most commonly used class for Android access to the network.

Here's how to implement a Get,post request with HttpClient, respectively.

1.Get Request

HttpGet get = new HttpGet ("http://www.baidu.com"); HttpClient hclient = new Defaulthttpclient (); HttpResponse = Hclient.execute (get);

　　

2.Post Request

map<string, string> map = new hashmap<string, string> (), Map.put ("id", id), Map.put ("name", name), Map.put (" Permission ", string.valueof (permission)); list<namevaluepair> list = new arraylist<namevaluepair> (); if (map! = null &&!map.isempty ()) {for (map.entry<string, string> entry:map.entrySet ()) {///iterators//Key-value pairs Nameva Luepair Namevaluepair = new Basicnamevaluepair (Entry.getkey (), Entry.getvalue ()); List.add (Namevaluepair); }}urlencodedformentity entity = new Urlencodedformentity (list, encode);//use Post to submit data httppost post = new HttpPost (path) ;p ost.setentity (entity);//request body in//default client httpClient = HttpClient; HttpResponse HttpResponse = Client.execute (POST);

　　

3. code example:

First GET request

Import Java.io.BufferedReader;  Import java.io.IOException;  Import Java.io.InputStream;    Import Java.io.InputStreamReader;  Import org.apache.http.HttpEntity;  Import Org.apache.http.HttpResponse;  Import org.apache.http.client.ClientProtocolException;  Import org.apache.http.client.HttpClient;  Import Org.apache.http.client.methods.HttpGet;  Import org.apache.http.impl.DefaultHttpClientConnection;    Import org.apache.http.impl.client.DefaultHttpClient;  Import android.app.Activity;  Import Android.os.Bundle;  Import Android.view.Menu;  Import Android.view.MenuItem;  Import Android.view.View;  Import Android.view.View.OnClickListener;    Import Android.widget.Button;      public class Mainactivity extends Activity {private Button Requestbutton;      Private HttpResponse HttpResponse;      Private httpentity entity;          @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main);                    Requestbutton = (Button) Findviewbyid (R.id.requestbutton);                   Requestbutton.setonclicklistener (New Onclicklistener () {public void OnClick (View v) {              New Thread (New Downtest ()). Start ();      }          }); } class Downtest implements runnable{public void run () {//Generate a Request object, request HttpGet get = N              EW HttpGet ("http://www.baidu.com");              Generates an HTTP client object HttpClient hclient = new Defaulthttpclient ();              Use HTTP client to send Request object InputStream InputStream = null;                                  try {HttpResponse = Hclient.execute (get),//httpresponse return response//Return response data is placed inside                  entity = httpresponse.getentity ();                  InputStream = Entity.getcontent ();                  BufferedReader reader = new BufferedReader (new InputStreamReader (InputStream));             String result = "";     String line = "";                 while (line = Reader.readline ())! = null) {result = result+ line;              } System.out.println (Result); } catch (Clientprotocolexception e) {//TODO auto-generated catch block E.printstacktra              CE ();              } catch (IOException e) {//TODO auto-generated catch block E.printstacktrace ();                  }finally{try{inputstream.close ();                  }catch (Exception e) {e.printstacktrace ();   }              }       }     }        }

Again a POST request

public class Accounthttputils {//private static String PATH = "Http://192.168.253.1:8088/CallName/servlet/AccountS      Ervler ";      private static HttpClient HttpClient;      Public accounthttputils (HttpClient HttpClient) {this.httpclient = HttpClient; } public static string Sendhttpclient (String path,map<string,string> map,string encode) {List<namevalu        epair> list = new arraylist<namevaluepair> ();                if (map! = null &&!map.isempty ()) {for (map.entry<string, string> entry:map.entrySet ()) {//iterator                Key-value pairs namevaluepair Namevaluepair = new Basicnamevaluepair (Entry.getkey (), Entry.getvalue ());            List.add (Namevaluepair); }} try {//implement encapsulates the requested parameter into the form, urlencodedformentity entity = new Urlencodedformentity (list          , encode);          Submit data using post HttpPost post = new HttpPost (path);       Post.setentity (entity);//In the request body   Default clients HttpClient client = HttpClient;          HttpResponse HttpResponse = Client.execute (POST);              if (Httpresponse.getstatusline (). Getstatuscode () = = () {httpentity httpentity = httpresponse.getentity ();              InputStream InputStream = Httpentity.getcontent ();          Return Changeinputestream (InputStream, encode); }} catch (Unsupportedencodingexception e) {//TODO auto-generated catch block E.printstacktrace ()      ;      } catch (Clientprotocolexception e) {//TODO auto-generated catch block E.printstacktrace ();      } catch (IOException e) {//TODO auto-generated catch block E.printstacktrace ();     } return ""; /** * Convert an input stream into a string * @param inputstream * @param encode * @return * * * private static string C Hangeinputestream (InputStream inputstream,string encode) {//often called memory stream, written in memory BytearrayoutputstrEAM outputstream = new Bytearrayoutputstream ();          byte[] data = new byte[1024];          int len = 0;          String result = "";                      if (InputStream! = null) {try {while (len = inputstream.read (data))!=-1) {                      Data.tostring ();                  Outputstream.write (data, 0, Len);                  }//result is the result = new String (Outputstream.tobytearray (), encode) in the Dopost function set on the server side;                  Outputstream.flush ();                  Outputstream.close ();              Inputstream.close ();              } catch (IOException e) {//TODO auto-generated catch block E.printstacktrace ();      }} return result;          } public static string set (String id,string name,int permission) {//TODO auto-generated method stub          map<string, string> map = new hashmap<string, string> (); Map.put ("id", ID);          Map.put ("name", name);          Map.put ("Permission", string.valueof (permission));          String result = Accounthttputils.sendhttpclient (abstracthttputils.path+ "Servlet/accountservler", Map, "Utf-8");          SYSTEM.OUT.PRINTLN ("Result:" + result);      return result;   }    }

4.get request to access is Baidu, the return is Baidu home source code

Post is a class in one of my small projects

But the structure is already very clear ....

Keep the spare ...

Http://www.cnblogs.com/jycboy/p/httpclient.html

Android's HttpClient