问题描述
我对android开发相对较新。我正在开发一个Android应用程序，我正在向Web服务器发送请求并解析json对象。我经常收到 java.net.SocketTimeoutException：与服务器通信时连接超时异常。有时它会毫无问题地完美运行。
我知道这个问题在很多时候都被问过了。但我仍然没有得到任何满意的解决方案来解决这个问题。我在下面发布我的logcat和app-server通信代码。
I'm relatively new to android development. I'm developing an android application where i'm sending request to web server and parsing json objects. Frequently i'm getting java.net.SocketTimeoutException: Connection timed out exception while communicating with the server. Some times it will work perfectly without any problem.I know this same question has been asked in SO many times. But still i didn't get any satisfying solution to this problem. I'm posting my logcat and app-server communication code below.
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
$WrappedNetworkSystem.connect(BlockGuard.java:357)
03-25 10:55:32.617: W/System.err(18868):at
org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:204)
03-25 10:55:32.617: W/System.err(18868):at
org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:437)
03-25 10:55:32.617: W/System.err(18868):at java.net.Socket.connect(Socket.java:1002)
03-25 10:55:32.621: W/System.err(18868):at
org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>
(HttpConnection.java:75)
03-25 10:55:32.621: W/System.err(18868): at
org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>
(HttpConnection.java:48)03-25 10:55:32.624: W/System.err(18868):at
org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$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
任何人都可以帮我找到解决方案吗？在此先感谢....
Can anyone help me out to find out a solution for this? Thanks in Advance....
推荐答案
我在网上搜索了很多关于连接超时异常的文档，我理解的是，防止SocketTimeoutException超出了我们的限制......有效处理它的一种方法是定义连接超时，然后使用try catch块处理它....希望这将有助于将来的任何人谁面临同样的问题。
I've searched all over the web and after reading lot of docs regarding connection timeout exception, the thing i understood is that, preventing SocketTimeoutException is beyond our limit...One way to effectively handle it is to define a connection timeout and later handle it by using a try catch block.... hope this will help anyone in future who are facing the same issue.
HttpUrlConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(7000); //set the timeout in milliseconds
这篇关于获取java.net.SocketTimeoutException：连接在android中超时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！