Android发送post请求

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android 向web服务器发送post请求并获取结果，因为 需要访问到网络必须要有权限，先在AndroidManifest.xml中加入如下配置：

1. <uses-permission  android:name="android.permission.INTERNET"/>

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1. package httppost.pack;
   
2. import java.util.ArrayList;
   
3. import java.util.List;
   
4. import org.apache.http.HttpResponse;
   
5. import org.apache.http.NameValuePair;
   
6. import org.apache.http.client.entity.UrlEncodedFormEntity;
   
7. import org.apache.http.client.methods.HttpPost;
   
8. import org.apache.http.impl.client.DefaultHttpClient;
   
9. import org.apache.http.message.BasicNameValuePair;
   
10. import org.apache.http.protocol.HTTP;
    
11. import org.apache.http.util.EntityUtils;
    
12. 
    
13. import android.app.Activity;
    
14. import android.os.Bundle;
    
15. import android.widget.TextView;
    
16. public class AndroidHttpPost extends Activity {
    
17.      /** Called when the activity is first created. */
    
18.      String action="http://www.beijibear.com/android_post.php";
    
19.      HttpPost httpRequest=null;
    
20.      List <NameValuePair> params=null;
    
21.      HttpResponse httpResponse;
    
22.      TextView tv=null;
    
23. @Override
    
24. public void onCreate(Bundle savedInstanceState) {
    
25.      super.onCreate(savedInstanceState);
    
26.      setContentView(R.layout.main);
    
27.      tv=(TextView)findViewById(R.id.textView1);
    
28.      /*建立HttpPost连接*/
    
29.      httpRequest=new HttpPost(action);
    
30.      /*Post运作传送变数必须用NameValuePair[]阵列储存*/
    
31.      params=new ArrayList<NameValuePair>();
    
32.      params.add(new BasicNameValuePair("username","beijibear"));
    
33. try {
    
34.      //发出HTTP request
    
35.       httpRequest.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));
    
36.      //取得HTTP response
    
37.      httpResponse=new DefaultHttpClient().execute(httpRequest);
    
38.      //若状态码为200
    
39.      if(httpResponse.getStatusLine().getStatusCode()==200){
    
40.      //取出回应字串
    
41.      String strResult=EntityUtils.toString(httpResponse.getEntity());
    
42.       tv.setText(strResult);
    
43.      }else{
    
44.      tv.setText("Error Response"+httpResponse.getStatusLine().toString());
    
45. }
    
46. } catch (Exception e) {
    
47.      // TODO Auto-generated catch block
    
48.      tv.setText(e.getMessage().toString());
    
49.     }
    
50.   }
    
51. }

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