CODEWITHSUNDEEP
java
Marcus Junius Brutus
Marcus Junius Brutus

Reputation: 27286

java.io.Console - like utility that's compatible with stdin redirection?

Is there a utility class in some Java library offering amenities like those of java.io.Console but compatible with Bash pipe redirection of input?

The following code:

import java.io.Console;
public class Foo {
  public static void main(String args[]) {
    Console cons = System.console();
    String foo = cons.readLine(); // line-5
  }
}

will throw a NPE on line-5 when doing a:

echo "test" | java Foo

This is also mentioned in this SO discussion without offering any alternatives save the use of System.in.

Upvotes: 5

Views: 518

Answers (1)

Haim Sulam
Haim Sulam

Reputation: 324

Try the following:

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Foo {
    public static void main(String args[]) throws Exception {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String foo = in.readLine(); // line-5
        System.out.println(foo);
    }
}

The password related features should be done manually.

Upvotes: 3

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