Read/Catch stdout message in another application

Question

I have an application A which writes a stdout message. Now i will build a second application B which reads the stdout from A.

I don't want create a file, the message will be write in the console and should be read from console.

I know, that i have some possibilities to read from console (Scanner, System.console(), BufferedInputstream), but how can i catch the stdout from another application?

Are your applications batch applications? Which Operating System do you use? — Mirko Ebert, Dec 14 '18 at 10:07
No batch application. OS is linux. I need a platform-independent solution. — HaDo, Dec 14 '18 at 10:14

score 0 · Answer 1 · answered Dec 14 '18 at 10:03

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You can try communication through sockets. This guide seems useful http://cs.lmu.edu/~ray/notes/javanetexamples/

answered Dec 14 '18 at 10:03

Lyubomir Papazov

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Thx, I'll take a look at it. – HaDo Dec 14 '18 at 10:13

score 0 · Answer 2 · answered Dec 14 '18 at 10:13

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If your program B executed program A (either through ProcessBuilder.start() or System.exec()) you have a Process instance. Then you can use Process.getInputStream() to obtain an input stream which is connected to program A's standard output stream.

Otherwise, there is no platform-independent way to obtain the other program's catch the other program's output. You will need to use some other form of communication.

answered Dec 14 '18 at 10:13

Hoopje

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Thx for your the note. Unfortunately B is not executed A. What form of communication would you recommend ? – HaDo Dec 14 '18 at 10:19

Read/Catch stdout message in another application

2 Answers2