我试图制作一个Java远程控制程序,通过客户端访问它,这是来自服务器的一些代码。我是编程新手,我希望获得帮助。
我希望服务器继续运行->问题是,当我将字符串值分配给CmdMenuDecision时,服务器崩溃。有什么办法吗?
我也收到内存泄漏,int CmdMenuDecision = new Scanner(System.in).nextInt(); ,,,我使用@SuppressWarnings(“ resource”),但我不确定它是否好。
private static Scanner SCANNER = new Scanner(System. in );
private String command1;
private String command2;
private String command3;
private String command4;
public void runtimeChoice() {
System.out.println("what do you want to do? 1. Execute CMD Command");
int CmdMenuDecision = new Scanner(System. in ).nextInt();
switch (CmdMenuDecision) {
case 1:
CMDCommand();
break;
default:
System.out.println("No valid answer");
break;
}
private void CMDCommand() {
System.out.println("CMD is working!");
Runtime rt = Runtime.getRuntime();
try {
System.out.println("Insert desired command");
command1 = CmdCommand.nextLine();
command2 = CmdCommand.nextLine();
command3 = CmdCommand.nextLine();
command4 = CmdCommand.nextLine();
rt.exec(new String[] {
"cmd.exe", "/c", /*"start",*/
command1, command2, command3, command4
});
System.out.println("Command: " + command1 + " " + command2 + " " + command3 + " " + command4 + " executed succesfully");
} catch (IOException e) {
e.printStackTrace();
}
}
}
最佳答案
更改
int CmdMenuDecision = new Scanner(System.in).nextInt();
至
boolean flag = false;
do {
try {
int CmdMenuDecision = new Scanner(System.in).nextInt();
flag = true; // If the execution flow reached this line then that means that the user input was correct; break the loop.
}
catch(InputMismatchException e) {
System.out.println("Invalid input, try again.");
}
}while(!flag);
这将确保您获得
Integer
变量的CmdMenuDecision
输入。当
String
期望Scanner
时输入int
将引发InputMismatchException;您需要处理它。