android获取超时异常,获取java.net.SocketTimeoutException：连接超时在android
我比较新的android开发。我正在开发一个Android应用程序，我发送请求到Web服务器和解析json对象。我经常收到java.net.SocketTimeoutException：与服务器通信时连接超时异常。有些时候，它会工作完美没有任何问题。
我知道这个问题已经问了很多次。但仍然没有得到任何令人满意的解决这个问题。我发布我的logcat和应用服务器通信代码下面。
public JSONObject RequestWithHttpUrlConn(String _url, String param){
HttpURLConnection con = null;
URL url;
String response = "";
Scanner inStream = null;
PrintWriter out = null;
try {
url = new URL(_url);
con = (HttpURLConnection) url.openConnection();
con.setDoOutput(true);
con.setRequestMethod("POST");
if(param != null){
con.setFixedLengthStreamingMode(param.getBytes().length);
}
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
out = new PrintWriter(con.getOutputStream());
if(param != null){
out.print(param);
}
out.flush();
out.close();
inStream = new Scanner(con.getInputStream());
while(inStream.hasNextLine()){
response+=(inStream.nextLine());
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
if(con != null){
con.disconnect();
}if(inStream != null){
inStream.close();
}if(out != null){
out.flush();
out.close();
}
}
}
Logcat：
03-25 10:55:32.613: W/System.err(18868): java.net.SocketTimeoutException: Connection
timed out
03-25 10:55:32.617: W/System.err(18868):at org.apache.harmony.luni.platform.OSNetworkSystem.connect(Native Method)
03-25 10:55:32.617: W/System.err(18868):at dalvik.system.BlockGuard
$WrappedNetworkSystem.connect(BlockGuard.java:357)
03-25 10:55:32.617: W/System.err(18868):at
org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:204)
03-25 10:55:32.617: W/System.err(18868):at
org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:437)
03-25 10:55:32.617: W/System.err(18868):at java.net.Socket.connect(Socket.java:1002)
03-25 10:55:32.621: W/System.err(18868):at
org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.
(HttpConnection.java:75)
03-25 10:55:32.621: W/System.err(18868): at
org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.
(HttpConnection.java:48)03-25 10:55:32.624: W/System.err(18868):at
org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect
(HttpConnection.java:322)03-25 10:55:32.624: W/System.err(18868):at
org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get
(HttpConnectionPool.java:89)03-25 10:55:32.628: W/System.err(18868):at
org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpCon
nection(HttpURLConnectionImpl.java:285)
03-25 10:55:32.628: W/System.err(18868):at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConn
ection(HttpURLConnectionImpl.java:267)
03-25 10:55:32.636: W/System.err(18868):at
org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect
(HttpURLConnectionImpl.java:205)
03-25 10:55:32.636: W/System.err(18868):at
org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getOutputS
tream(HttpURLConnectionImpl.java:614)
03-25 10:55:32.636: W/System.err(18868):at
com.myapp.core.JSONRequest.RequestWithHttpUrlConn(JSONRequest.java:63)
03-25 10:55:32.636: W/System.err(18868): at com.myapp.core.DetailPage
$AsyncRecBooks.doInBackground(AKBookDetailView.java:265)
03-25 10:55:32.640: W/System.err(18868): at com.myapp.core.DetailPage
$AsyncRecBooks.doInBackground(AKBookDetailView.java:1)
03-25 10:55:32.640: W/System.err(18868): at android.os.AsyncTask$2.call
(AsyncTask.java:185)
03-25 10:55:32.640: W/System.err(18868): at java.util.concurrent.FutureTask
$Sync.innerRun(FutureTask.java:306)
03-25 10:55:32.640: W/System.err(18868): at java.util.concurrent.FutureTask.run
(FutureTask.java:138)
03-25 10:55:32.640: W/System.err(18868): at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
03-25 10:55:32.648: W/System.err(18868): at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
03-25 10:55:32.648: W/System.err(18868): at java.lang.Thread.run(Thread.java:1019)
03-25 10:55:32.652: E/JSON Parser(18868): Error parsing data org.json.JSONException:
End of input at character 0 of
任何人都可以帮助我找出一个解决方案？提前致谢….