致命异常：Android JSON响应中的AsyncTask#3

我有下一个例外，但我不知道为什么。我正在尝试从Django服务器获取JSON响应对象（Django服务器可以正常工作），但我遇到了下一个错误：

    05-13 19:57:29.069: E/AndroidRuntime(8845): FATAL EXCEPTION: AsyncTask #3
    05-13 19:57:29.069: E/AndroidRuntime(8845): Process: com.example.webservicestemperatura, PID: 8845
    05-13 19:57:29.069: E/AndroidRuntime(8845): java.lang.RuntimeException: An error occured while executing doInBackground()
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at android.os.AsyncTask$3.done(AsyncTask.java:300)
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at java.util.concurrent.FutureTask.run(FutureTask.java:242)
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at java.lang.Thread.run(Thread.java:841)
    05-13 19:57:29.069: E/AndroidRuntime(8845): Caused by: java.lang.IllegalArgumentException: Illegal character in scheme at index 0: 192.168.1.68:8000/c_f/4.0
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at java.net.URI.create(URI.java:727)
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:75)
    05-13 19:57:29.069: E/AndroidRuntime(8845):     at com.example.webservicestemperatura.MainActivity$sampleService.doInBackground(MainActivity

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您的URI无效，因为它缺少协议。如果在前面附加

http://

，它应该可以正常工作

作为对更新的响应，您应该学会正确阅读日志

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写有“

由：

引起”的行需要查找，因为它们通常会告诉您问题的根本原因。在这种情况下，快速的google for会提供许多堆栈溢出的答案来解决您的问题。

您的Url格式不正确，您需要定义“htttp://”

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如果我使用http://它说：连接被拒绝：在浏览器中它工作得很好，我得到了json的答案，那么异常的其余部分是什么？可能会拒绝连接的原因有很多。更新OP

class sampleService extends AsyncTask<Boolean, Boolean, Boolean> {

        @Override
        protected Boolean doInBackground(Boolean... params) {
            HttpClient httpClient = new DefaultHttpClient();
            HttpGet del = new HttpGet("192.168.1.68:8000/c_f/4.0");
            del.setHeader("content-type", "application/json");
            try {
                HttpResponse resp = httpClient.execute(del);
                String respStr = EntityUtils.toString(resp.getEntity());
                JSONObject respJSON = new JSONObject(respStr);
                String far = respJSON.getString ("far"); //Check your type data to return in your web service.


                System.out.println("HOLAAAAAAAAAAAAAAAAAAAAAA" + far);
                Log.d("Service", far);
            } catch(Exception ex) {
                Log.e("Service","Error!", ex);
            }
            return null;
        }

05-13 20:10:56.935: E/Service(12445): Error!
05-13 20:10:56.935: E/Service(12445): org.apache.http.conn.HttpHostConnectException: Connection to http://192.168.1.68:8000 refused
05-13 20:10:56.935: E/Service(12445):   at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
05-13 20:10:56.935: E/Service(12445):   at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
05-13 20:10:56.935: E/Service(12445):   at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
05-13 20:10:56.935: E/Service(12445):   at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
05-13 20:10:56.935: E/Service(12445):   at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
05-13 20:10:56.935: E/Service(12445):   at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
05-13 20:10:56.935: E/Service(12445):   at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
05-13 20:10:56.935: E/Service(12445):   at com.example.webservicestemperatura.MainActivity$sampleService.doInBackground(MainActivity.java:53)
05-13 20:10:56.935: E/Service(12445):   at com.example.webservicestemperatura.MainActivity$sampleService.doInBackground(MainActivity.java:1)
05-13 20:10:56.935: E/Service(12445):   at android.os.AsyncTask$2.call(AsyncTask.java:288)
05-13 20:10:56.935: E/Service(12445):   at java.util.concurrent.FutureTask.run(FutureTask.java:237)
05-13 20:10:56.935: E/Service(12445):   at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
05-13 20:10:56.935: E/Service(12445):   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
05-13 20:10:56.935: E/Service(12445):   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
05-13 20:10:56.935: E/Service(12445):   at java.lang.Thread.run(Thread.java:841)
05-13 20:10:56.935: E/Service(12445): Caused by: java.net.ConnectException: socket failed: EACCES (Permission denied)
05-13 20:10:56.935: E/Service(12445):   at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:181)

http://192.168.1.68:8000/c_f/4.0