我正在使用Codename One进行一个项目，在该项目中我需要检查某些地址。如果该地址不存在，则我的代码中名为lectura的变量应为404。但是，当我找到一个不存在的地址时，我的代码将停止并在屏幕上显示一条消息，指出java.net.SocketTimeoutException与选项取消或重试。我需要我的程序知道地址不存在并继续前进，而不要暂停。我的代码是：
public int readCNO(String cantidad, int number){
ConnectionRequest r3 = new ConnectionRequest();
r3.setUrl("http://" + ipZona + "/arduino/" + cantidad + "!" + type + "/" + Integer.toString(number));
r3.setPost(false);
r3.setDuplicateSupported(true);
r3.setTimeout(100);
NetworkManager.getInstance().addToQueueAndWait(r3);
r3.addResponseListener(new ActionListener()
{
public void actionPerformed(ActionEvent ev)
{
try
{
NetworkEvent event = (NetworkEvent) ev;
byte[] data= (byte[]) event.getMetaData();
String decodedData = new String(data,"UTF-8");
System.out.println(decodedData);
lectura = Integer.parseInt(decodedData.trim());
} catch (Exception e)
{
//ex.printStackTrace();
lectura = 404;
}
}
});
NetworkManager.getInstance().addToQueue(r3);
//NetworkManager.getInstance().killAndWait(r3);
return lectura;
}
帮助真的很感激！
大卫。
完整的异常将在以后显示，但是它没有引用我的任何类，没有引用上面的代码，也没有引用它。
java.net.SocketTimeoutException: connect timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
at sun.net.www.http.HttpClient.New(HttpClient.java:308)
at sun.net.www.http.HttpClient.New(HttpClient.java:326)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:996)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:932)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:850)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1300)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
at com.codename1.impl.javase.JavaSEPort.getResponseCode(JavaSEPort.java:4557)
at com.codename1.io.ConnectionRequest.performOperation(ConnectionRequest.java:330)
at com.codename1.io.NetworkManager$NetworkThread.run(NetworkManager.java:261)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)
java.net.SocketTimeoutException: connect timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
at sun.net.www.http.HttpClient.New(HttpClient.java:308)
at sun.net.www.http.HttpClient.New(HttpClient.java:326)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:996)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:932)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:850)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1300)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
at com.codename1.impl.javase.JavaSEPort.getResponseCode(JavaSEPort.java:4557)
at com.codename1.io.ConnectionRequest.performOperation(ConnectionRequest.java:330)
at com.codename1.io.NetworkManager$NetworkThread.run(NetworkManager.java:261)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)
最佳答案
我用这篇文章catching unknown host exception in codename one的答案解决了我的问题，代码是：
NetworkManager.getInstance().addErrorListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
//handle your error here consume the event
evt.consume();
}
});