android http 连接通信

一共有三个文件，JAVA，MAIN.XML,AndroidManifest.xml
JAVA文件：

package Android_https.com;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class Android_httpsActivity extends Activity {       privateButton sendbutton = null;       privateHttpResponse httpResponse = null;    privateHttpEntity httpEntity = null;       @Override    public voidonCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.main);              sendbutton = (Button)findViewById(R.id.sendbutton);       sendbutton.setOnClickListener(new OnClickListener() {                  @Override         public void onClick(View v) {            HttpGet httpget = newHttpGet("http://localhost/");            HttpClient httpClient = newDefaultHttpClient();            InputStream inputStream = null;            try {               httpResponse = httpClient.execute(httpget);               httpEntity = httpResponse.getEntity();               inputStream = httpEntity.getContent();               BufferedReader reader = new BufferedReader(newInputStreamReader(inputStream));                              String result = "" ;               String line = "";               while ((line = reader.readLine()) != null){                  result = result + line;               }               System.out.println(result);            } catch (Exception e) {               // TODO Auto-generated catch block               System.out.println("有错误！！！");               e.printStackTrace();            }                     }      });           }}

<?xml version="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   android:orientation="vertical" >   <TextView       android:layout_width="fill_parent"       android:layout_height="wrap_content"       android:text="@string/hello" />      <Button       android:id="@+id/sendbutton"       android:layout_width="fill_parent"       android:layout_height="wrap_content"       android:text="简单发送请求，并回得报文"              /></LinearLayout>

<?xml version="1.0"encoding="utf-8"?><manifestxmlns:android="http://schemas.android.com/apk/res/android"   package="Android_https.com"   android:versionCode="1"   android:versionName="1.0" >   <uses-sdk android:minSdkVersion="3"/>   <uses-permissionandroid:name="android.permission.INTERNET"/>   <application       android:icon="@drawable/ic_launcher"       android:label="@string/app_name" >       <activity           android:label="@string/app_name"           android:name=".Android_httpsActivity" >           <intent-filter >               <action android:name="android.intent.action.MAIN"/>               <categoryandroid:name="android.intent.category.LAUNCHER"/>           </intent-filter>       </activity>   </application></manifest>