How to switch to another server if connection refused? [closed]
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13-07-2021 - |
質問
I need to switch to another if on current connection, connection refused, or if current IP do not exist. Here is a part of code:
String [] server= {"10.201.30.200", "10.66.20.70",}; // Servers array
public void Telnet(String[] server) {
try {
out2 = new PrintStream(new FileOutputStream("output.txt"));
String [] hrnc = {"HRNC01_", "HRNC02_", "HRNC03_","NRNC01_", "NRNC02_"};
for (int i = 0; i < server.length; i++) {
// Connect to the specified server
if (server[i].equals("10.201.30.200")) {
// Commands via telnet
} else if (server[i].equals("10.66.20.70")) {
// Commands
}
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
For example if first IP don't exist i need to connect to the next server.
解決
Try to do the connection, capture exceptions and if it happen try another IP Address.
EDIT: Of course! This is my implementation
package tests;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;
public class Connection {
// Servers array
private static final String[] server = { "10.201.30.200", "10.66.20.70" };
// @logoff: default Telnet port
private static final int port = 23;
public static void telnet(String[] server) {
PrintStream out2;
try {
out2 = new PrintStream(new FileOutputStream("output.txt"));
String[] hrnc = { "HRNC01_", "HRNC02_", "HRNC03_", "NRNC01_",
"NRNC02_" };
for (int i = 0; i < server.length; i++) {
try {
// @logoff: try connection
Socket socket = new Socket(server[i], port);
} catch (IOException e) {
// @logoff: typical "Connection timed out" or
// "Connection refused"
System.err.println("Error connecting to " + server[i]
+ ". Error = " + e.getMessage());
// @logoff: continue to next for element
continue;
}
// Connect to the specified server
if (server[i].equals("10.201.30.200")) {
// Commands via telnet
}
else if (server[i].equals("10.66.20.70")) {
// Commands
}
}
} catch (Exception e) {
e.printStackTrace();
}
// @logoff: your method returns void
return;
}
public static void main(String[] args) {
telnet(server);
}
}
他のヒント
Try putting each connection attempt in a try/catch statement
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