Question

我在链接中的Web服务器中有一些数据：http://tonyjoseph.site90.com/demo/现在我需要使用url连接将这些数据接收到我的android中。我在异步任务中给出了一些代码。代码如下：

String link18="http://tonyjoseph.site90.com/demo/";
URL url18 = new URL(link18);
URLConnection conn18 = url18.openConnection();
conn18.setDoOutput(true);
OutputStreamWriter wr18 = new OutputStreamWriter (conn18.getOutputStream());
BufferedReader reader18 = new BufferedReader (new InputStreamReader(conn18.getInputStream()));
StringBuilder sb18=new StringBuilder();
String line18 = null;
while((line18 = reader18.readLine()) !=null)
{
    sb18.append(line18);
    break;
}
status18=sb18.toString();
Log.d("Status 18",status18);// Nothing displayed in logcat even the Status18 tag is not displayed in log
System.out.println(status18); // Here also System.out.println tag is not displayed in logcat.

但问题是我在String status18中获得空值。在异步任务的doinBackground中调用此代码之后。当我试图向这个值吐司时，它显示出一个空的吐司。

如果我错了，有人可以通过纠正代码来帮助我。提前谢谢..

Answer 1

您没有提到您使用哪种语言连接android和服务器
假设您使用Jason，请遵循以下代码：

try{
                    HttpClient httpclient = new DefaultHttpClient();
                        HttpPost httppost = new HttpPost("http://yourwebsiteAdrress");
                        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                        HttpResponse response = httpclient.execute(httppost); 
                        HttpEntity entity = response.getEntity();
                        is = entity.getContent();
                        Log.e("pass 1", "connection success ");
                }
                     catch(Exception e){
                        Log.e("Fail 1", e.toString());
                        showToast("Connect to the internet");}


                    try
                     {
                         BufferedReader reader = new BufferedReader
                        (new InputStreamReader(is,"iso-8859-1"),8);
                         StringBuilder sb = new StringBuilder();
                         while ((line = reader.readLine()) != null)
                    {
                             sb.append(line + "\n");
                         }
                         is.close();
                         result = sb.toString();
                    Log.e("pass 2", "connection success ");

                }
                     catch(Exception e)
                     {Log.e("Fail 2", e.toString());}



                    try
                    {
                            //to receive web page information
                             JSONObject json_data = new JSONObject(result);
                             Yourjsonmessage=(json_data.getInt("code")); 


         // in my case the information is error message so I wanted to print it to the user                                
                     if(!"".equals( Yourjsonmessage))
                     {
                      showToast( Yourjsonmessage);
                     }
                     else if 
                     {
                        showToast("done!");

                     }

使用url连接和异步任务未从Web服务器接收数据

1 个答案: