Android Network programming uses HttpClient to access Web sites

Httpclientdemo.java interface is a two-button and a text box

/* * Use Httpclientlai to access submit request, receive response * A, send GET request * 1, create HttpClient object; HttpClient httpclient=new defaulthttpclient (); * 2, send GET request, create HttpGet object: HttpGet httpget=new httpget ("http://www.baidu.com"); * 3, the HttpGet object implemented with HttpClient object will get the object HttpResponse the server response object, the response is encapsulated in HttpResponse: * HttpResponse httpresponse= Httpclient.execute (HttpGet);  * 4, Get HTTP instance httpentity entity=httpresponse.getentity () from HttpResponse response;   * */public class Httpclientdemo extends Activity {TextView response;   Declares the HttpClient object HttpClient HttpClient; Handler handler=new Handler () {public void Handlemessage (Message msg) {if (msg.what==0x123) {///Use response to display the response of the server Respo  Nse.append (msg.obj.toString () + "\ n");    }  }   };        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (r.layout.activity_http_client);        1, create Defaulthttpclient object, interface callback HttpClient is an interface httpclient=new defaulthttpclient ();  Response= (TextView) Findviewbyid (r.id.response);  }/* * Send a GET request process to the service * * */public void Accesssecret (View v) {response.settext (""); Click the button to open the thread, send a GET request in the process new thread () {public void run () {//2, create a HttpGet object HttpGet httpget=new httpget ("http:/ /localhost:8080/foo/secret.jsp ");//jsp deployed on to cat server try {//3, HttpGet object with HttpClient object will get the object HttpResponse the server response object,    The response is encapsulated in the HttpResponse HttpResponse Httpresponse=httpclient.execute (httpget);    4, obtain the HTTP instance httpentity entity=httpresponse.getentity () from the HttpResponse response; The IF (entity!=null) {//5,entity instance obtains the content, establishes the input stream, reads the server content BufferedReader br=new BufferedReader (The new InputStreamReader (entity    . GetContent ()));    String Line=null;    while ((Line=br.readline ())!=null) {//loop reads the content from the input stream message msg=new message ();    msg.what=0x123;        Msg.obj=line; Handler.sendmessage (msg);//Send UI thread update UI component}}} catch (Clientprotocolexception e) {//TODO auto-generated catch Blo Cke.printstacktrace ();} catch (IOException e) {//TODO auto-generated catch blockE.printstacktrace ();}    }}.start (); */* * Send POST Request Flow * * * */public void Showlogin (View v) {Final view logindialog=getlayoutinflate   R (). Inflate (r.layout.login, NULL); New Alertdialog.builder (Httpclientdemo.this). Settitle ("Login System"). Setview (Logindialog). Setpositivebutton ( OK, new Dialoginterface.onclicklistener () {@Overridepublic void OnClick (dialoginterface dialog, int which) {// Gets the user name and password for the dialog box, final string name= ((EditText) Logindialog.findviewbyid (R.id.name)). GetText (). toString (); final string Pass= ((EditText) Logindialog.findviewbyid (R.id.pass)). GetText (). toString ();//Click OK to open the thread and send the POST request new thread () { public void Run () {try {//2, create HttpPost object HttpPost httppost=new httppost ("http://localhost:8080/foo/login.jsp");// JSP deployment on the to Cat server//3, the passed parameters are encapsulated, Namevaluepair is a simple name value to the node type list<namevaluepair> params=new arraylist< Namevaluepair> ();p Arams.add (New Basicnamevaluepair ("name", name)),//Add parameter Params.add (new Basicnamevaluepair (" Pass ", p);//3, set the encoding httppost.setentity (new Urlencodedformentity (params,http). Utf_8));//4,httpclient Object executes HttpPost request, obtains corresponding HttpResponse httpresponse=httpclient.execute (httppost);//5, If the status code is 200, the server succeeds in the appropriate if (Httpresponse.getstatusline (). Getstatuscode () ==200) {//200: Response succeeded, 301/302: Redirect, 404:not Found the resource was not found, the 501 server encountered an error that made it unable to service the request string msg = Entityutils.tostring (httpresponse.getentity ()); Looper.prepare ();//Prompt Login Success Toast.maketext (Httpclientdemo.this, MSG, Toast.length_long). Show (); Looper.loop ();}} catch (ParseException e) {//Todo auto-generated catch Blocke.printstacktrace ();} catch (IOException e) {//Todo Auto-gene Rated catch Blocke.printstacktrace ();}}.       Start ();}    }). Setnegativebutton ("Cancel", null). Show (); }

Android Network programming uses HttpClient to access Web sites