android - 发出Http Get和Post请求

我是android编程新手，我正在尝试开发一个应用程序，它调用这个web服务，传递值并以xml的形式返回，但是每次发出请求时，我都会得到一个返回，因为数据条目无效。我试着通过http get和post来实现，但这两种方法都没有效果。网址如下：
http://hiscentral.cuahsi.org/webservices/hiscentral.asmx?op=GetSeriesCatalogForBox2
密码是，

HttpGet:

public class Main extends Activity implements OnClickListener
{
 String xml=null;
 String responseBody;
 String text = null;
 @Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    findViewById(R.id.my_button).setOnClickListener(this);
}

public void onClick(View arg0)
{
    Button b = (Button)findViewById(R.id.my_button);
    b.setClickable(false);
    new LongRunningGetIO().execute();
}

private class LongRunningGetIO extends AsyncTask <Void, Void, String>
{


    @Override
    protected String doInBackground(Void... params)
    {

try
         {
        HttpClient httpclient = new DefaultHttpClient();
         HttpContext localContext = new BasicHttpContext();
         HttpGet httpGet = new     HttpGet("http://hiscentral.cuahsi.org/webservices/hiscentral.asmx/GetSeriesCatalogForBox2?xmin=-100 &xmax=-90 &ymin=40 &ymax=55 &conceptKeyword=precipitation &beginDate=1/1/2009&endDate=1/1/2010 HTTP/1.1");
         HttpResponse response = httpclient.execute(httpGet, localContext);
          HttpEntity entity = response.getEntity();
          text = getASCIIContentFromEntity(entity);
         }

         catch (Exception e)
         {
             return e.getLocalizedMessage();
         }
         return text;
    }



     catch (ClientProtocolException e)
                     {
                         e.printStackTrace();
                     }
                     catch (IOException e)
                     {
                         e.printStackTrace();
                     }

                 }
             catch (UnsupportedEncodingException e)
             {
              e.printStackTrace();
              }
             return responseBody;
    }
      protected void onPostExecute(String results)
                    {
                        if (results!=null)
                        {
                            EditText et = (EditText)findViewById(R.id.my_edit);
                            et.setText(results);
                        }
                        Button b = (Button)findViewById(R.id.my_button);
                        b.setClickable(true);
                    }
                }
            }

而httppost是，

HttpPost
public class Main extends Activity implements OnClickListener
{
String xml=null;
String responseBody;
String text = null;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findViewById(R.id.my_button).setOnClickListener(this);
}

public void onClick(View arg0)
{
Button b = (Button)findViewById(R.id.my_button);
b.setClickable(false);
new LongRunningGetIO().execute();
}

private class LongRunningGetIO extends AsyncTask <Void, Void, String>
{


@Override
protected String doInBackground(Void... params)
{
 HttpClient httpclient = new DefaultHttpClient();
         String Url = "http://hiscentral.cuahsi.org/webservices/hiscentral.asmx?op=GetSeriesCatalogForBox2";
         if(!Url.endsWith("?"))
         {
                Url += "?";
         }
         HttpPost httppost = new HttpPost(Url);
             // Add data

             List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(5);
             nameValuePairs.add(new BasicNameValuePair("xmin", "-100"));
             nameValuePairs.add(new BasicNameValuePair("xmax", "-90"));
             nameValuePairs.add(new BasicNameValuePair("ymin", "40"));
             nameValuePairs.add(new BasicNameValuePair("ymax", "55"));
             nameValuePairs.add(new BasicNameValuePair("networkIDs", ""));
             nameValuePairs.add(new BasicNameValuePair("conceptKeyword", "precipitation"));
             nameValuePairs.add(new BasicNameValuePair("beginDate", "1/1/2009"));
             nameValuePairs.add(new BasicNameValuePair("endDate", "1/1/2010"));
             try
             {
                      httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                     //  Log.d("myapp", "works till here. 2");
                      HttpResponse response = httpclient.execute(httppost);
                      responseBody = EntityUtils.toString(response.getEntity());
                     //    Log.d("myapp", "response " + response.getEntity());
                     // HttpEntity entity = response.getEntity();
                      //   xml = getASCIIContentFromEntity(entity);
                     }
                     catch (Exception e)
                     {
                         return e.getLocalizedMessage();
                     }
             return responseBody;
    }

                     protected void onPostExecute(String results)
                    {
                        if (results!=null)
                        {
                            EditText et = (EditText)findViewById(R.id.my_edit);
                            et.setText(results);
                        }
                        Button b = (Button)findViewById(R.id.my_button);
                        b.setClickable(true);
                    }
                }
            }

请帮忙！啊！
在阿德凡斯…

最佳答案

httpget中缺少networkids参数，请尝试以下操作：

    http://hiscentral.cuahsi.org/webservices/hiscentral.asmx/GetSeriesCatalogForBox2?xmin=-100&xmax=-90&ymin=40&ymax=55&conceptKeyword=precipitation&
networkIDs=YOUR_NETWORK_IDS&beginDate=1/1/2009&endDate=1/1/2010

而不是

    http://hiscentral.cuahsi.org/webservices/hiscentral.asmx/GetSeriesCatalogForBox2?xmin=-100&xmax=-90&ymin=40&ymax=55&
conceptKeyword=precipitation&beginDate=1/1/2009&endDate=1/1/2010%20HTTP/1.1

在httppost中，将url更改为：

String Url = "http://hiscentral.cuahsi.org/webservices/hiscentral.asmx/GetSeriesCatalogForBox2";