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在我的应用程序中，我正在使用 webservices 获取数据。但是当服务器关闭或未处于活动状态时，它会给出响应代码 500 并且我的应用程序强制关闭。

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

请参阅以下代码：

调用函数以调用 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 的函数：

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;
}

查看我正在比较响应代码的行。请指导我如何在那里破解我的代码并在 ui 上显示 ua toast

4

3 回答 3

3

同时你应该检查响应码，通过这个码你可以很容易地发现请求是由于服务器宕机或其他原因而成功还是失败。

您可以使用以下方法检查响应状态代码：

response.getStatusLine().getStatusCode();
于 2011-12-05T06:56:03.627 回答
3

问题是您正在使用空响应或不代表 json 字符串的响应创建 JSON 对象。

因此，如果出现以下情况，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 '['
于 2011-12-05T06:57:57.193 回答
1

看到您发布的 logcat 后，我​​觉得您正在获取 JSON 字符串作为响应。当你得到你想要的响应时，你需要解析它。

因此，为了以后您的代码不会受到阻碍，我会在您收到回复后帮助您继续，提供以下我的示例：

在我的一个项目中，我从 Web 服务得到的响应是：

{"checkrecord":[{"rollno":"abc2","percentage":40,"attended":12,"missed":34}],"Table1":[]}

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 看起来像这样：

{"Table1":[],"checkrecord":[{"missed":34,"attended":12,"percentage":40,"rollno":"abc2"}]}

这就是@gwa 试图提出的建议。我刚刚给你一个代码示例。首先获取您的结果并确定它是否有效。

希望能帮助到你

干杯

于 2011-12-05T07:05:10.653 回答