Intellij stdin rederection

Question

What is a difference how Idea run Batch configuraton compare to pure cmd.exe in windows?

I create batch config for run my java app. When I run it, it show me result scipt in Idea console:

cmd.exe /c java -classpath C:\app;C:\app\libs.jar App < input.txt

This app waiting input from standard input. This line should run it and read from input.txt file. But insted of reading it waiting for input. When i press ^D in Idea console, App prints me that No inputs was.

In same time when i copy paste this starting script from Idea console direct to Windows cmd, everything happen as expected, App reads the file and finish correctly.

I did read stackoverflow answers and find suggestions to try External Tool Idea option. I try run it as:

java -classpath C:\app;C:\app\libs.jar App < input.txt

But it still waiting for input. As well as Java Application run configuration if I pass file name as argument, it wait for input:

"C:\Program Files\Java\jdk1.8.0_92\bin\java"
 -Didea.launcher.port=7533
"-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IDEA\bin"
 -Dfile.encoding=UTF-8
 -classpath "long..long..classpath"
 com.intellij.rt.execution.application.AppMain Col < input.txt

I did find few links (one,two,three) about stdin rederection and it seems like there is no way to do this from idea only from code. Thank you!

The only way I did find is pass filename as argument and add like at beginning of main something like: `if(args.length > 1)System.setIn(new FileInputStream(args[1]));` — Ivan Bryzzhin, Jun 18 '16 at 18:05
@useruser272933 Never knew about `System.setIn`. If you can write that as an answer, I'd certainly upvote it. — coding_idiot, Jan 09 '17 at 08:34

score 11 · Accepted Answer · answered Jan 10 '17 at 09:39

11

The only way I did find is pass filename as argument to main function and add line like this:

if(args.length > 1)
    System.setIn(new FileInputStream(args[1]));

answered Jan 10 '17 at 09:39

Ivan Bryzzhin

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Intellij stdin rederection

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