Question

在我的应用程序中，我使用webservices获取数据。但是当服务器关闭或处于活动状态时，它会给出响应代码500并关闭我的应用程序。

请指导我如何在我的应用程序中处理这种情况.logcat输出如下所示：

12-05 12:17:22.337: V/response code(950): 500
12-05 12:17:22.347: W/System.err(950): org.json.JSONException: A JSONArray text must start with '[' at character 1 of <html>

12-05 12:17:22.347: W/System.err(950):     <head>

12-05 12:17:22.347: W/System.err(950):         <title>Configuration Error</title>

12-05 12:17:22.347: W/System.err(950):         <style>

12-05 12:17:22.347: W/System.err(950):          body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;} 

12-05 12:17:22.347: W/System.err(950):          p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px}

12-05 12:17:22.347: W/System.err(950):          b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}

12-05 12:17:22.347: W/System.err(950):          H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }

12-05 12:17:22.347: W/System.err(950):          H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }

12-05 12:17:22.356: W/System.err(950):          pre {font-family:"Lucida Console";font-size: .9em}

12-05 12:17:22.356: W/System.err(950):          .marker {font-weight: bold; color: black;text-decoration: none;}

12-05 12:17:22.356: W/System.err(950):          .version {color: gray;}

12-05 12:17:22.356: W/System.err(950):          .error {margin-bottom: 10px;}

12-05 12:17:22.356: W/System.err(950):          .expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; }

12-05 12:17:22.356: W/System.err(950):         </style>

12-05 12:17:22.356: W/System.err(950):     </head>

12-05 12:17:22.356: W/System.err(950): 

12-05 12:17:22.356: W/System.err(950):     <body bgcolor="white">

12-05 12:17:22.366: W/System.err(950): 

12-05 12:17:22.366: W/System.err(950):             <span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>

12-05 12:17:22.366: W/System.err(950): 

12-05 12:17:22.366: W/System.err(950):             <h2> <i>Configuration Error</i> </h2></span>

12-05 12:17:22.366: W/System.err(950): 

12-05 12:17:22.366: W/System.err(950):             <font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">

12-05 12:17:22.366: W/System.err(950): 

12-05 12:17:22.366: W/System.err(950):             <b> Description: </b>An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

12-05 12:17:22.377: W/System.err(950):             <br><br>

12-05 12:17:22.377: W/System.err(950): 

12-05 12:17:22.377: W/System.err(950):             <b> Parser Error Message: </b>Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive.<br><br>

12-05 12:17:22.377: W/System.err(950): 

12-05 12:17:22.377: W/System.err(950):             <b>Source Error:</b> <br><br>

12-05 12:17:22.377: W/System.err(950): 

12-05 12:17:22.377: W/System.err(950):             <table width=100% bgcolor="#ffffcc">

12-05 12:17:22.377: W/System.err(950):                <tr>

12-05 12:17:22.377: W/System.err(950):                   <td>

12-05 12:17:22.377: W/System.err(950):                       <code><pre>

12-05 12:17:22.377: W/System.err(950): 

12-05 12:17:22.377: W/System.err(950): Line 30:             &lt;error statusCode=&quot;404&quot; redirect=&quot;filenotfound.htm&quot; /&gt;

12-05 12:17:22.377: W/System.err(950): Line 31:         &lt;/customErrors&gt;

12-05 12:17:22.377: W/System.err(950): <font color=red>Line 32:         &lt;compilation debug=&quot;true&quot; targetFramework=&quot;4.0&quot;&gt;

12-05 12:17:22.396: W/System.err(950): </font>Line 33:          &lt;expressionBuilders&gt;

12-05 12:17:22.396: W/System.err(950): Line 34:                 &lt;add expressionPrefix=&quot;NopResources&quot; type=&quot;NopSolutions.NopCommerce.BusinessLogic.Localization.NopResourceExpressionBuilder, Nop.BusinessLogic&quot; /&gt;</pre></code>

12-05 12:17:22.396: W/System.err(950): 

12-05 12:17:22.396: W/System.err(950):                   </td>

12-05 12:17:22.396: W/System.err(950):                </tr>

12-05 12:17:22.396: W/System.err(950):             </table>

12-05 12:17:22.396: W/System.err(950): 

12-05 12:17:22.396: W/System.err(950):             <br>

12-05 12:17:22.396: W/System.err(950): 

12-05 12:17:22.396: W/System.err(950):             <b> Source File: </b> C:\Websites\balajeebazaar\web.config<b> &nbsp;&nbsp; Line: </b> 32

12-05 12:17:22.396: W/System.err(950):             <br><br>

12-05 12:17:22.396: W/System.err(950): 

12-05 12:17:22.396: W/System.err(950):             <hr width=100% size=1 color=silver>

12-05 12:17:22.407: W/System.err(950): 

12-05 12:17:22.407: W/System.err(950):             <b>Version Information:</b>&nbsp;Microsoft .NET Framework Version:2.0.50727.4963; ASP.NET Version:2.0.50727.4955

12-05 12:17:22.407: W/System.err(950): 

12-05 12:17:22.407: W/System.err(950):             </font>

12-05 12:17:22.407: W/System.err(950): 

12-05 12:17:22.416: W/System.err(950):     </body>

12-05 12:17:22.416: W/System.err(950): </html>

12-05 12:17:22.416: W/System.err(950): <!-- 

12-05 12:17:22.416: W/System.err(950): [ConfigurationErrorsException]: Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive. (C:\Websites\balajeebazaar\web.config line 32)

12-05 12:17:22.416: W/System.err(950):    at System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags hostingFlags)

12-05 12:17:22.416: W/System.err(950): [HttpException]: Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive. (C:\Websites\balajeebazaar\web.config line 32)

12-05 12:17:22.416: W/System.err(950):    at System.Web.HttpRuntime.FirstRequestInit(HttpContext context)

12-05 12:17:22.416: W/System.err(950):    at System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context)

12-05 12:17:22.416: W/System.err(950):    at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context)

12-05 12:17:22.416: W/System.err(950): --><!-- 

12-05 12:17:22.426: W/System.err(950): This error page might contain sensitive information because ASP.NET is configured to show verbose error messages using &lt;customErrors mode="Off"/&gt;. Consider using &lt;customErrors mode="On"/&gt; or &lt;customErrors mode="RemoteOnly"/&gt; in production environments.-->
12-05 12:17:22.426: W/System.err(950):  at org.json.JSONTokener.syntaxError(JSONTokener.java:448)
12-05 12:17:22.426: W/System.err(950):  at org.json.JSONArray.<init>(JSONArray.java:104)
12-05 12:17:22.426: W/System.err(950):  at org.json.JSONArray.<init>(JSONArray.java:150)
12-05 12:17:22.426: W/System.err(950):  at cm.bzaar.CallWebservices.getCategory(CallWebservices.java:48)
12-05 12:17:22.426: W/System.err(950):  at cm.bzaar.CategoryActivity$Loader.doInBackground(CategoryActivity.java:98)
12-05 12:17:22.426: W/System.err(950):  at cm.bzaar.CategoryActivity$Loader.doInBackground(CategoryActivity.java:1)
12-05 12:17:22.436: W/System.err(950):  at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-05 12:17:22.436: W/System.err(950):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:256)
12-05 12:17:22.436: W/System.err(950):  at java.util.concurrent.FutureTask.run(FutureTask.java:122)
12-05 12:17:22.436: W/System.err(950):  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:648)
12-05 12:17:22.436: W/System.err(950):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:673)
12-05 12:17:22.436: W/System.err(950):  at java.lang.Thread.run(Thread.java:1060)
12-05 12:17:22.436: W/dalvikvm(950): threadid=17: thread exiting with uncaught exception (group=0x4001aa28)
12-05 12:17:22.446: E/AndroidRuntime(950): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception
12-05 12:17:22.446: E/AndroidRuntime(950): java.lang.RuntimeException: An error occured while executing doInBackground()
12-05 12:17:22.446: E/AndroidRuntime(950):  at android.os.AsyncTask$3.done(AsyncTask.java:200)
12-05 12:17:22.446: E/AndroidRuntime(950):  at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:234)
12-05 12:17:22.446: E/AndroidRuntime(950):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:258)
12-05 12:17:22.446: E/AndroidRuntime(950):  at java.util.concurrent.FutureTask.run(FutureTask.java:122)
12-05 12:17:22.446: E/AndroidRuntime(950):  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:648)
12-05 12:17:22.446: E/AndroidRuntime(950):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:673)
12-05 12:17:22.446: E/AndroidRuntime(950):  at java.lang.Thread.run(Thread.java:1060)
12-05 12:17:22.446: E/AndroidRuntime(950): Caused by: java.lang.NullPointerException
12-05 12:17:22.446: E/AndroidRuntime(950):  at cm.bzaar.CategoryActivity$Loader.doInBackground(CategoryActivity.java:100)
12-05 12:17:22.446: E/AndroidRuntime(950):  at cm.bzaar.CategoryActivity$Loader.doInBackground(CategoryActivity.java:1)
12-05 12:17:22.446: E/AndroidRuntime(950):  at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-05 12:17:22.446: E/AndroidRuntime(950):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:256)
12-05 12:17:22.446: E/AndroidRuntime(950):  ... 4 more

查看以下代码：

调用函数调用webservice的代码段：

@Override
        protected Void doInBackground(Void... arg0) {
            CategoryArray = new JSONArray();
            CategoryArray = CW
                    .getCategory("url");

            for (int i = 0; i <= CategoryArray.length() - 1; i++) {
                try {
                    Log.v("category array : ", CategoryArray.getString(i));
                    String[] val = CategoryArray.getString(i).split("•");
                    CategoryID.add(i, val[0]);
                    CategoryList.add(i, val[1]);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
            adapter = new CategoryListAdapter(CategoryActivity.this,
                    CategoryList);
            return null;
        }

调用webservice的功能：

public JSONArray getCategory(String URL){

try {
            HttpPost request = new HttpPost(URL);
            request.setHeader("Accept", "application/json");
            request.setHeader("Content-type", "application/json");
            // Send request to WCF service
            DefaultHttpClient httpClient1 = new DefaultHttpClient();
            HttpResponse response = httpClient1.execute(request);
            Log.v("response code", response.getStatusLine().getStatusCode()
                    + "");
            responseCode = response.getStatusLine().getStatusCode();
//          if(responseCode > 200){                   // HERE I WS TRYING TO BREAK THE CODE AND TRYING TO RETURN NULL BT UNABLE TO DO SO
//              CategoryArray = new JSONArray();
//              CategoryArray.put(false);
//              return null;
//          }else{
            HttpEntity responseEntity = response.getEntity();
            // Read response data into buffer
            char[] buffer = new char[(int) responseEntity.getContentLength()];
            InputStream stream = responseEntity.getContent();
            InputStreamReader reader = new InputStreamReader(stream);
            reader.read(buffer);
            stream.close();
            CategoryArray = new JSONArray(new String(buffer));
            Log.v("results length : ", CategoryArray.length() + "");
//          }
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return CategoryArray;
}

看到我在比较响应代码的行。请指导我如何在那里打破我的代码并在ui上显示你的祝酒

Answer 1

同时您应该检查响应代码，通过使用此代码，您可以轻松找出请求是否由于服务器关闭或任何其他原因而成功或失败。

您可以使用以下方法检查响应状态代码：

response.getStatusLine().getStatusCode();

Answer 2

问题是您使用空的或不表示json字符串的响应创建JSON对象。

因此，您应该根据您的响应创建一个JSON对象：

- the status code is 200
- the response is not empty
- the response starts with '['

Answer 3

看到你发布的logcat后，我觉得你正在获取一个JSON字符串作为响应。当你得到你想要的答案时，你需要解析它。

因此，为了让您在代码中不被阻止，我正在帮助您继续通过举出以下我的例子得到你的答复之后：

在我的一个项目中，我从Web服务获得的响应是：

{ “checkrecord”：[{ “rollno”： “ABC2”， “百分比”：40， “出席”：12， “遗漏”：34}]， “表1”：[]}

为了解析我做了以下事情：

      JSONObject jsonobject = new JSONObject(result);
      JSONArray array = jsonobject.getJSONArray("checkrecord"); 
      int max = array.length();
      for (int j = 0; j < max; j++) 
   {
      JSONObject obj = array.getJSONObject(j);
      JSONArray names = obj.names();

     for (int k = 0; k < names.length(); k++) 
   {
      String name = names.getString(k);
      String value= obj.getString(name);  

   }

我的JSONObject如下所示：

{ “表1”：[]， “checkrecord”：[{ “遗漏”：34， “出席”：12， “百分比”：40 “rollno”： “ABC2”}]}

这是@gwa试图建议的内容。我刚给你一个代码示例。首先获得结果并确定其是否有效。

希望有所帮助

干杯

处理Android中的服务器响应

3 个答案: