Android中使用Post请求的方法

package com.justsy.url;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
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.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.os.Bundle;
public class HttpURLActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    System.out.println("start url...");
    String url = "http://192.168.2.112:8080/JustsyApp/Applet";
    // 第一步，创建HttpPost对象
    HttpPost httpPost = new HttpPost(url);
    // 设置HTTP POST请求参数必须用NameValuePair对象
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("action", "downloadAndroidApp"));
    params.add(new BasicNameValuePair("packageId", "89dcb664-50a7-4bf2-aeed-49c08af6a58a"));
    params.add(new BasicNameValuePair("uuid", "test_ok1"));
    HttpResponse httpResponse = null;
    try {
      // 设置httpPost请求参数
      httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
      httpResponse = new DefaultHttpClient().execute(httpPost);
      //System.out.println(httpResponse.getStatusLine().getStatusCode());
      if (httpResponse.getStatusLine().getStatusCode() == 200) {
        // 第三步，使用getEntity方法活得返回结果
        String result = EntityUtils.toString(httpResponse.getEntity());
        System.out.println("result:" + result);
        T.displayToast(HttpURLActivity.this, "result:" + result);
      }
    } catch (ClientProtocolException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    System.out.println("end url...");
    setContentView(R.layout.main);
  }
}

String path = "http://192.168.2.115:8080/android-web-server/httpConnectServlet.do?PackageID=89dcb664-50a7-4bf2-aeed-49c08af6a58a";
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setConnectTimeout(5000);
System.out.println(conn.getResponseCode());