我正在使用 InetAddress 来确定我的服务器是否在线。
如果服务器离线,它将重新启动服务器。
此过程每 5 分钟循环一次,以再次检查服务器是否在线。
它工作正常,但现在我需要弄清楚如何指定在检查服务器状态时使用端口 43594 而不是默认端口 80。
谢谢!这是我的代码:
import java.net.InetAddress;
public class Test extends Thread {
public static void main(String args[]) {
try {
while (true) {
try
{
InetAddress address = InetAddress.getByName("cloudnine1999.no-ip.org");
boolean reachable = address.isReachable(10000);
if(reachable){
System.out.println("Online");
}
else{
System.out.println("Offline: Restarting Server...");
Runtime.getRuntime().exec("cmd /c start start.bat");
}
}
catch (Exception e)
{
e.printStackTrace();
}
Thread.sleep(5 * 60 * 1000);
}
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
}
EDIT:
好吧,所以我接受了别人的建议,然后就做到了这一点。但现在当我取消注释这一行时..Runtime.getRuntime().exec("cmd /c start start.bat");
我收到这个错误..
error: unreported exception IOException; must be caught or declared to be thrown
这是我当前的代码:
import java.net.*;
import java.io.*;
public class Test extends Thread {
public static void main(String args[]) {
try {
while (true) {
SocketAddress sockaddr = new InetSocketAddress("cloudnine1999.no-ip.org", 43594);
Socket socket = new Socket();
boolean online = true;
try {
socket.connect(sockaddr, 10000);
}
catch (IOException IOException) {
online = false;
}
if(!online){
System.out.println("OFFLINE: Restarting Server..");
//Runtime.getRuntime().exec("cmd /c start start.bat");
}
if(online){
System.out.println("ONLINE");
}
Thread.sleep(1 * 10000);
}
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
}
正如我在评论中已经提到的,根据JavadocisReachable 的实现方式不允许您控制所选端口。实际上,如果系统权限允许这样做,它只会对机器执行 ping 操作(ICMP 请求)。
手动执行此操作(即使用套接字)肯定会起作用,并且实际上并不会更复杂和/或更长时间:
SocketAddress sockaddr = new InetSocketAddress("cloudnine1999.no-ip.org", 43594);
// Create your socket
Socket socket = new Socket();
boolean online = true;
// Connect with 10 s timeout
try {
socket.connect(sockaddr, 10000);
} catch (SocketTimeoutException stex) {
// treating timeout errors separately from other io exceptions
// may make sense
online=false;
} catch (IOException iOException) {
online = false;
} finally {
// As the close() operation can also throw an IOException
// it must caught here
try {
socket.close();
} catch (IOException ex) {
// feel free to do something moderately useful here, eg log the event
}
}
// Now, in your initial version all kinds of exceptions were swallowed by
// that "catch (Exception e)". You also need to handle the IOException
// exec() could throw:
if(!online){
System.out.println("OFFLINE: Restarting Server..");
try {
Runtime.getRuntime().exec("cmd /c start start.bat");
} catch (IOException ex) {
System.out.println("Restarting Server FAILED due to an exception " + ex.getMessage());
}
}
编辑:忘记处理IOException
补充说,这也意味着服务器无法运行
EDIT2:添加了 close() 可以抛出的 IOException 的处理
EDIT3:以及 exec() 的异常处理
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