Android从URL获取文本时始终为空

我想发送一个http请求并从该请求中获取一个字符串

我目前正在使用这段代码，但无论我的URL是什么，我总是得到null。有什么问题吗

试一试{ //为所需页面创建URL URL=新URL（“http://hostname:80/index.html”

试试这个

URL url = new URL("http://whatever");
URLConnection urlConnection = url.openConnection();
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
//read stream here    

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尝试使用此代码

此代码对我有效：

httpClient = AndroidHttpClient.newInstance("Android");
        String url = "Your URL";
        try{
            HttpGet httpGet = new HttpGet(url);
            HttpResponse response = httpClient.execute(httpGet);
            if(response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){ //Don't know what string you are waiting for
                 //do something
            }
        }
        catch(IOException e){
            httpClient.close();
        }

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如果您提供了正确的url，代码工作正常。当您尝试在Android上执行此操作时，您是否在AndroidManifest.xml中设置了正确的Internet权限？我已在AndroidManifest.xml中添加了Internet权限。我确实为其提供了正确的url，但每次都为空。事实上，我的url不正确，现在我已更正它，并将其设置为空设置一个异常“java.io.EOFException”。这当然是用我的原始代码测试的。url是This=>需要从该特定url返回的字符串是：YldZbUZNakF3TUE9PQ==我测试了上述内容，但仍然是一样的。事实上，我的url是不正确的，现在我已经更正了它，我得到了一个异常“java.io.EOFException”。这当然是用我的原始代码测试的。我在这一行得到一个错误：“HttpResponse response=httpClient.execute（httpGet）；”这些是错误的第一行：//字段描述符#9 Lorg/apache/http/conn/ClientConnectionManager；受保护的final org.apache.http.conn.ClientConnectionManager connManager；//字段描述符#11 Lorg/apache/http/conn/routing/HttpRoutePlanner；受保护的final org.apache.http.conn.routing.HttpRoutePlanner；//字段描述符#13 Lorg/apache/http/ConnectionReuseStrategy；protectedfinal org.apache.http.ConnectionReuseStrategy-reuseStrategy；

                String URL = "http://hostname:80/index.html"
                String XML = stringWriter.toString();
                // System.out.println(XML);

                se = new StringEntity(XML, "UTF-8");
                se.setContentType("text/xml;charset=UTF-8");
                HttpPost httppost = new HttpPost(URL);
                httppost.setEntity(se);

                HttpClient httpclient = new DefaultHttpClient();
                response = httpclient.execute(httppost);

                HttpEntity entity = response.getEntity();

httpClient = AndroidHttpClient.newInstance("Android");
        String url = "Your URL";
        try{
            HttpGet httpGet = new HttpGet(url);
            HttpResponse response = httpClient.execute(httpGet);
            if(response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){ //Don't know what string you are waiting for
                 //do something
            }
        }
        catch(IOException e){
            httpClient.close();
        }