在android中的http請求和http響應？

我的工作有：在android中的http請求和http響應？

org.apache.http.HttpResponse; 
org.apache.http.client.HttpClient; 
org.apache.http.client.methods.HttpGet; 
org.apache.http.impl.client.DefaultHttpClient;

我使用JSP編寫服務器端代碼。

我不知道從我的模擬器發送一些值給服務器的過程。並從服務器響應中獲取一個字符串的值。

我的意思是說...有什麼方法可以使用？如何使用它們。？

來源

2012-02-29 sagar

下面是我執行的代碼編輯發送用戶名和密碼從android到服務器端JSP頁面。來自服務器的響應是一個json對象，然後進行處理。代碼如下所示。

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(); 
    } 
    } 

    } 

}

來源

2012-11-08 10:38:52 sagar

要發送一個HTTP GET請求和檢索響應：

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); 
}

調用它通過：

get(context, "http://developer.android.com/index.html");

，您將獲得由logcat *:S Test:V

注意，新線程是記錄避免阻塞UI線程

來源

2012-02-29 07:57:47

在android中的http請求和http響應？

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