没有从Servlet Page得到任何响应

Question

在Android中，我编写了一个程序，并在单击“ Servlet页面”的按钮上进行了请求，作为响应，它将执行写在该Servlet页面上的消息，但是当我运行我的项目时，它对该按钮单击不执行任何操作。

这是我的代码，

public static final String URL = "http://10.0.2.2:8080/HttpGetServlet/HelloWorldServlet";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    button = (Button) findViewById(R.id.button);
    outputText = (TextView) findViewById(R.id.outputTxt);

    button.setOnClickListener(this);
}

public void onClick(View view) 
{
    GetXMLTask task = new GetXMLTask();
    task.execute(new String[] { URL });
}

private class GetXMLTask extends AsyncTask<String, Void, String> 
{
    @Override
    protected String doInBackground(String... urls) 
    {
        String output = null;
        for (String url : urls) 
        {
            output = getOutputFromUrl(url);
        }
        return output;
    }

    private String getOutputFromUrl(String url) 
    {
        String output = null;
        try 
        {
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(url);

            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            output = EntityUtils.toString(httpEntity);
        } 
        catch (UnsupportedEncodingException e) 
        {
            e.printStackTrace();
        } 
        catch (ClientProtocolException e) 
        {
            e.printStackTrace();
        } 
        catch (IOException e) 
        {
            e.printStackTrace();
        }
        catch (Exception e)
        {
            Toast.makeText(getApplicationContext(), "Server Not Found!", Toast.LENGTH_LONG).show();
        }
        return output;
    }

    @Override
    protected void onPostExecute(String output) 
    {

        if(output==null)
            Toast.makeText(getApplicationContext(), "Server Not Found!", Toast.LENGTH_LONG).show(); 
        outputText.setText(output);
    }
}

如果找不到URL，则应该生成一个异常，但我正在捕获异常，那么也没有任何异常。

我错了。

请帮忙。

谢谢。

Answer 1

       try 
            {
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpGet httpGet = new HttpGet(url);

                HttpResponse httpResponse = httpClient.execute(httpGet);
                HttpEntity httpEntity = httpResponse.getEntity();

                output = EntityUtils.toString(httpEntity);

                System.out.println(output); // here you can check the value of the output String.
            } 

如果它有一个值（应该），那么您的问题出在您的用户界面上。

也许您需要配置界面获取响应的方式。