如何在 Java 中执行 shell 脚本

Question

I have to run a shell script from Java in a Linux box for eg, Below is the script path and all parameters needed by the script.

"ksh /xyz/abc/data/code_base/RUN_SCRIPTS/dev/my_script.sh param1 param2 20200901 459 121"

Below is the code,

String script = "ksh /xyz/abc/data/code_base/RUN_SCRIPTS/dev/my_script.sh param1 param2 20200901 459 121";
ProcessBuilder processBuilder = new ProcessBuilder();                       
processBuilder.command(script);
processBuilder.redirectErrorStream(true);
//start() will be in try catch
process = processBuilder.start();

int exitVal = process.waitFor();

if(exitVal == 0){
   //code
}

Do i need to pass the script as a List by adding each as a separate String in the List ? "ksh" , "/xyz/abc/data/code_base/RUN_SCRIPTS/dev/my_script.sh" , "param1" "param2" "20200901" "459" "121"

On my Windows machine, i am opening a Notepad as below and it works fine,

ProcessBuilder processBuilder = new ProcessBuilder("Notepad.exe", "C:/Dev/Test.txt");
processBuilder.redirectErrorStream(true);
process = processBuilder.start();

Will the script get executed on the Linux box properly or any more changes are required in the code ??

Answer 1

You should be able to use Runtime.exec() or ProcessBuilder to invoke a shell to run a script, but the whole process is full of pitfalls.

I would suggest reading this article:

https://www.infoworld.com/article/2071275/when-runtime-exec---won-t.html

which explains many of these pitfalls, and how to avoid them. In particular, on Linux you'll almost certainly need to consume stdout and stderr from your shell invocation -- that's sometimes true even if the script doesn't produce any output. You'll also need to be careful how you handle spaces and special characters -- if there are any -- in the arguments to your script. The parser that Java uses for the command line blindly breaks a command line at whitespace.

Answer 2

看看这个 Runtime.getRunTime().exec