I am working on with:
org.apache.http.HttpResponse; org.apache.http.client.HttpClient; org.apache.http.client.methods.HttpGet; org.apache.http.impl.client.DefaultHttpClient; i am using jsp for writing server side code.
i am unaware of the procedure of sending some value to server from my emulator. and get a value o a string from the server response.
I mean to say... what are the methods to be used? How to use them.?
To send a HTTP GET request and retrieve response:
private static void get(final Context context, final String url) { new Thread() { @Override public void run() { HttpClient client = new DefaultHttpClient(); HttpGet request = Utils.createHttpRequest(context, url, true, false); setProxyIfNecessary(context, request); try { HttpResponse response = client.execute(request); Log.v("Test", "StatusCode: " + response.getStatusLine().getStatusCode() + ", Entity: " + EntityUtils.toString(response.getEntity())); } catch (Exception e) { // Oh, crash } } }.start(); } private static void setProxyIfNecessary(Context context, HttpUriRequest request) { ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connectivity == null ? null : connectivity.getActiveNetworkInfo(); if (networkInfo == null || networkInfo.getType() == ConnectivityManager.TYPE_WIFI) { return; } String proxyHost = Proxy.getHost(context); if (proxyHost == null) { return; } int proxyPort = Proxy.getPort(context); if (proxyPort < 0) { return; } HttpHost proxy = new HttpHost(proxyHost, proxyPort); ConnRouteParams.setDefaultProxy(request.getParams(), proxy); } Call it by:
get(context, "http://developer.android.com/index.html"); And you will get log by logcat *:S Test:V
Notice that the new thread is to avoid blocking UI thread
Below is a code i implemented for sending username and password from android to server side JSP page. The response from the server is a json object which is then processed.The code is as given below.
import java.util.ArrayList; import java.util.List; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.app.ProgressDialog; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class Login_Menu extends Activity { EditText usname; EditText pass; TextView tv; HttpClient client; HttpPost post; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login_lay); tv=(TextView) findViewById(R.id.login_stat_tv); usname=(EditText)findViewById(R.id.uname); pass=(EditText)findViewById(R.id.pass); Button login=(Button)findViewById(R.id.login_but); Button cancel=(Button)findViewById(R.id.cancel_but); client = new DefaultHttpClient(); String url="http://10.0.2.2:7001/proj/login.jsp"; post = new HttpPost(url); login.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { new login().execute(""); } }); cancel.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { usname.getText().clear(); pass.getText().clear(); } }); } private class login extends AsyncTask<String, Void, JSONObject>{ ProgressDialog dialog = ProgressDialog.show(Login_Menu.this, "", "Authenticating, Please wait..."); @Override protected JSONObject doInBackground(String... params) { Log.i("thread", "Doing Something..."); //authentication operation try{ List<NameValuePair> pairs = new ArrayList<NameValuePair>(); pairs.add(new BasicNameValuePair("username",usname.getText().toString())); pairs.add(new BasicNameValuePair("password",pass.getText().toString())); post.setEntity(new UrlEncodedFormEntity(pairs)); HttpResponse response = client.execute(post); int status=response.getStatusLine().getStatusCode(); if(status == 200) { HttpEntity e=response.getEntity(); String data=EntityUtils.toString(e); JSONObject last=new JSONObject(data); return last; } } catch(Exception e) { e.printStackTrace(); } return null; } protected void onPreExecute(){ //dialog.dismiss(); Log.i("thread", "Started..."); dialog.show(); } protected void onPostExecute(JSONObject result){ Log.i("thread", "Done..."); String status; String name; try { status= result.getString("status"); name=result.getString("uname"); if(dialog!=null) { dialog.dismiss(); } else{} if(status.equalsIgnoreCase("yes")) { tv.setText("Login Successful..."); Bundle newbundle=new Bundle(); newbundle.putString("uname",name); Intent myIntent=new Intent(Login_Menu.this,Instruction.class); myIntent.putExtras(newbundle); startActivity(myIntent); } else{ tv.setText("No User Found, please try again!"); } } catch (JSONException e) { e.printStackTrace(); } } } }