我是android开发的新手。我正在开发一个android应用程序,向web服务器发送请求并解析JSON对象。在与服务器通信时,我经常会遇到java.net.SocketTimeoutException: Connection timed out
异常。有时,它会完美地工作,没有任何问题。我知道同样的问题已经被问了很多次了。但是,对于这个问题,我仍然没有得到令人满意的解决方案。我在下面发布了我的logcat和应用服务器通信代码。
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
有人能帮我找出解决方案吗?提前感谢....
发布于 2013-03-28 22:29:57
我在网上到处搜索,在阅读了很多关于连接超时异常的文档后,我所理解的是,阻止SocketTimeoutException
已经超出了我们的极限。有效处理连接超时的一种方法是定义连接超时,然后使用try-catch
块进行处理。希望这篇文章能帮助将来遇到同样问题的任何人。
HttpUrlConnection conn = (HttpURLConnection) url.openConnection();
//set the timeout in milliseconds
conn.setConnectTimeout(7000);
发布于 2014-07-08 00:02:28
我知道这个问题有点老了。但由于我在做研究时偶然发现了这一点,我想添加一点可能会有所帮助。
如上所述,错误不能由客户端解决,因为它是与网络相关的问题。但是,您可以做的是重新尝试连接几次。在实际问题得到解决之前,这可能是一种变通方法。
for (int retries = 0; retries < 3; retries++) {
try {
final HttpClient client = createHttpClientWithDefaultSocketFactory(null, null);
final HttpResponse response = client.execute(get);
final int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != 200) {
throw new IllegalStateException("GET Request on '" + get.getURI().toString() + "' resulted in " + statusCode);
} else {
return response.getEntity();
}
} catch (final java.net.SocketTimeoutException e) {
// connection timed out...let's try again
}
}
也许这对某些人有帮助。
发布于 2015-07-24 20:29:18
如果你在localhost中测试服务器,你的Android设备必须连接到同一个本地网络。然后,您的应用程序使用的服务器URL必须包括您的计算机IP地址,而不是"localhost“掩码。
https://stackoverflow.com/questions/15608499
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