以编程方式在Java中检查centos'网络'服务状态

Question

I'm performing network service restart in java as below.

String[] serviceStop = { "service","network","restart" };
Process networkProc = new ProcessBuilder(serviceStop).start();
networkProc.waitFor();
Integer returncode=networkProc.exitValue();

which returns success code even if it is still restarting. but I need to make sure restart went successfully and return once complete by checking the network service status. how to achieve this in Java?

Answer 1

You can use service network status to display the network status. With loop and sleep you should achieve what you want but I'm realy surprised about your need.

• Are you sure the exitValue is 0?
• Are you sure that you have all permissions to execute this command ?

• Do you look at the process output ? (some processes exit with 0 but display an error)

   Process networkProc = new ProcessBuilder(serviceStop) .redirectOutput(new File("serviceRestartOuput.txt")) .start(); 

Instead of service, you can also use ifdown and ifup ifdown eth0 && ifup eth0 , replace eth0 with the name of your network interface. Call the processes like you do for service network restart .