Reading STDIN in Java that was started from a batch file
I have a console Java application, that depends on a lot of jar package. Therefore, I put all these packages in a batch file together. The only problem is, that if I start the Java app from the batch file I can't read from STDIN. I mean, I would like to process some user input, that was typed on the console, but nothing happens in the app.
To start the app from within the batch, I use this code (based upon this thread):
setlocal
for /F "tokens=*" %%a in ('more') do (
#%%a java -classpath ...
)
If I just invoke the Java app from the batch without the FOR loop, I also can't access to STDIN.
If I start the app directly from cmd, I can read from STDIN without any problems.
This is the code I am using to read from STDIN.
I really would like to use a batch file, because the command-line for the Java app is very long.
Is there a trick to redirect the STDIN to Java, or at least to a file ?
java batch-file stdin
edited Nov 27 '18 at 12:35
double-beep
2,39641026
asked Nov 27 '18 at 0:14
awgold90awgold90
316
add a comment |
I have a console Java application, that depends on a lot of jar package. Therefore, I put all these packages in a batch file together. The only problem is, that if I start the Java app from the batch file I can't read from STDIN. I mean, I would like to process some user input, that was typed on the console, but nothing happens in the app.
To start the app from within the batch, I use this code (based upon this thread):
setlocal
for /F "tokens=*" %%a in ('more') do (
#%%a java -classpath ...
)
If I just invoke the Java app from the batch without the FOR loop, I also can't access to STDIN.
If I start the app directly from cmd, I can read from STDIN without any problems.
This is the code I am using to read from STDIN.
I really would like to use a batch file, because the command-line for the Java app is very long.
Is there a trick to redirect the STDIN to Java, or at least to a file ?
java batch-file stdin
edited Nov 27 '18 at 12:35
double-beep
2,39641026
asked Nov 27 '18 at 0:14
awgold90awgold90
316
Why do you use more (like this)? It captures stdin and does not pass it to any subcommand (java in your case). It might be better to usejava -cp ... | moreinstead, but even then the resulting batch file is hard to use for scripting. (and the purpose of the tokens parsing is not clear to me at all)
– eckes
Nov 27 '18 at 3:41
Don't have the answer but this is not a java question, it's a cmd batch question. You want to redirect cmd batch stdin to the process called from within the batch.
– Perdi Estaquel
Nov 27 '18 at 4:51
TheFORloop you have used doesn't make any sense,Themorecommand captures thestdinand blocks the execution of the batch code until it terminates by pressingCTRL-Z(orCTRL-C) then you have#%%a java -classpath ...it would be translated to#WhatEverHaveBeenCapturedByMore java -classpath .... What are you trying to achieve with that? Did you get that code from someone or wrote it yourself?"If i start the app directly from cmd.exe, i can read from STDIN without any problems."Just do the same in the batch file as you did in CMD prompt.
– sst
Nov 27 '18 at 5:32
I added the thread, i used to build the batch command. My first try was to invoke the Java app from the batch without the <code>FOR</code> loop, but it didn't work. Then i thought maybe it have to be forced, so i used <code>more</code>. I would like to access to STDIN from the Java app, that is invoked from the batch, but it seems, the batch is blocking Java from doing that.
– awgold90
Nov 27 '18 at 9:12
My next try was to use the commandstartto execute the Java application in an other window. This worked well. But after this, i realized that invoking the Java app directly from a batch also worked. I have no imagination, what could be the problem.
– awgold90
Nov 28 '18 at 9:00
add a comment |
I have a console Java application, that depends on a lot of jar package. Therefore, I put all these packages in a batch file together. The only problem is, that if I start the Java app from the batch file I can't read from STDIN. I mean, I would like to process some user input, that was typed on the console, but nothing happens in the app.
To start the app from within the batch, I use this code (based upon this thread):
setlocal
for /F "tokens=*" %%a in ('more') do (
#%%a java -classpath ...
)
If I just invoke the Java app from the batch without the FOR loop, I also can't access to STDIN.
If I start the app directly from cmd, I can read from STDIN without any problems.
This is the code I am using to read from STDIN.
I really would like to use a batch file, because the command-line for the Java app is very long.
Is there a trick to redirect the STDIN to Java, or at least to a file ?
java batch-file stdin
edited Nov 27 '18 at 12:35
double-beep
2,39641026
asked Nov 27 '18 at 0:14
awgold90awgold90
316
I have a console Java application, that depends on a lot of jar package. Therefore, I put all these packages in a batch file together. The only problem is, that if I start the Java app from the batch file I can't read from STDIN. I mean, I would like to process some user input, that was typed on the console, but nothing happens in the app.
To start the app from within the batch, I use this code (based upon this thread):
setlocal
for /F "tokens=*" %%a in ('more') do (
#%%a java -classpath ...
)
If I just invoke the Java app from the batch without the FOR loop, I also can't access to STDIN.
If I start the app directly from cmd, I can read from STDIN without any problems.
This is the code I am using to read from STDIN.
I really would like to use a batch file, because the command-line for the Java app is very long.
Is there a trick to redirect the STDIN to Java, or at least to a file ?
java batch-file stdin
java batch-file stdin
edited Nov 27 '18 at 12:35
double-beep
2,39641026
asked Nov 27 '18 at 0:14
awgold90awgold90
316
edited Nov 27 '18 at 12:35
double-beep
2,39641026
asked Nov 27 '18 at 0:14
awgold90awgold90
316
edited Nov 27 '18 at 12:35
double-beep
2,39641026
edited Nov 27 '18 at 12:35
double-beep
2,39641026
edited Nov 27 '18 at 12:35
double-beep
2,39641026
2,39641026
asked Nov 27 '18 at 0:14
awgold90awgold90
316
asked Nov 27 '18 at 0:14
awgold90awgold90
316
asked Nov 27 '18 at 0:14
awgold90awgold90
316
316
Why do you use more (like this)? It captures stdin and does not pass it to any subcommand (java in your case). It might be better to usejava -cp ... | moreinstead, but even then the resulting batch file is hard to use for scripting. (and the purpose of the tokens parsing is not clear to me at all)
– eckes
Nov 27 '18 at 3:41
Don't have the answer but this is not a java question, it's a cmd batch question. You want to redirect cmd batch stdin to the process called from within the batch.
– Perdi Estaquel
Nov 27 '18 at 4:51
TheFORloop you have used doesn't make any sense,Themorecommand captures thestdinand blocks the execution of the batch code until it terminates by pressingCTRL-Z(orCTRL-C) then you have#%%a java -classpath ...it would be translated to#WhatEverHaveBeenCapturedByMore java -classpath .... What are you trying to achieve with that? Did you get that code from someone or wrote it yourself?"If i start the app directly from cmd.exe, i can read from STDIN without any problems."Just do the same in the batch file as you did in CMD prompt.
– sst
Nov 27 '18 at 5:32
I added the thread, i used to build the batch command. My first try was to invoke the Java app from the batch without the <code>FOR</code> loop, but it didn't work. Then i thought maybe it have to be forced, so i used <code>more</code>. I would like to access to STDIN from the Java app, that is invoked from the batch, but it seems, the batch is blocking Java from doing that.
– awgold90
Nov 27 '18 at 9:12
My next try was to use the commandstartto execute the Java application in an other window. This worked well. But after this, i realized that invoking the Java app directly from a batch also worked. I have no imagination, what could be the problem.
– awgold90
Nov 28 '18 at 9:00
add a comment |
Why do you use more (like this)? It captures stdin and does not pass it to any subcommand (java in your case). It might be better to usejava -cp ... | moreinstead, but even then the resulting batch file is hard to use for scripting. (and the purpose of the tokens parsing is not clear to me at all)
– eckes
Nov 27 '18 at 3:41
Don't have the answer but this is not a java question, it's a cmd batch question. You want to redirect cmd batch stdin to the process called from within the batch.
– Perdi Estaquel
Nov 27 '18 at 4:51
TheFORloop you have used doesn't make any sense,Themorecommand captures thestdinand blocks the execution of the batch code until it terminates by pressingCTRL-Z(orCTRL-C) then you have#%%a java -classpath ...it would be translated to#WhatEverHaveBeenCapturedByMore java -classpath .... What are you trying to achieve with that? Did you get that code from someone or wrote it yourself?"If i start the app directly from cmd.exe, i can read from STDIN without any problems."Just do the same in the batch file as you did in CMD prompt.
– sst
Nov 27 '18 at 5:32
I added the thread, i used to build the batch command. My first try was to invoke the Java app from the batch without the <code>FOR</code> loop, but it didn't work. Then i thought maybe it have to be forced, so i used <code>more</code>. I would like to access to STDIN from the Java app, that is invoked from the batch, but it seems, the batch is blocking Java from doing that.
– awgold90
Nov 27 '18 at 9:12
My next try was to use the commandstartto execute the Java application in an other window. This worked well. But after this, i realized that invoking the Java app directly from a batch also worked. I have no imagination, what could be the problem.
– awgold90
Nov 28 '18 at 9:00
Why do you use more (like this)? It captures stdin and does not pass it to any subcommand (java in your case). It might be better to use
java -cp ... | more instead, but even then the resulting batch file is hard to use for scripting. (and the purpose of the tokens parsing is not clear to me at all)– eckes
Nov 27 '18 at 3:41
Why do you use more (like this)? It captures stdin and does not pass it to any subcommand (java in your case). It might be better to use
java -cp ... | more instead, but even then the resulting batch file is hard to use for scripting. (and the purpose of the tokens parsing is not clear to me at all)– eckes
Nov 27 '18 at 3:41
Don't have the answer but this is not a java question, it's a cmd batch question. You want to redirect cmd batch stdin to the process called from within the batch.
– Perdi Estaquel
Nov 27 '18 at 4:51
Don't have the answer but this is not a java question, it's a cmd batch question. You want to redirect cmd batch stdin to the process called from within the batch.
– Perdi Estaquel
Nov 27 '18 at 4:51
The
FOR loop you have used doesn't make any sense,The more command captures the stdin and blocks the execution of the batch code until it terminates by pressing CTRL-Z (or CTRL-C) then you have #%%a java -classpath ... it would be translated to #WhatEverHaveBeenCapturedByMore java -classpath .... What are you trying to achieve with that? Did you get that code from someone or wrote it yourself? "If i start the app directly from cmd.exe, i can read from STDIN without any problems." Just do the same in the batch file as you did in CMD prompt.– sst
Nov 27 '18 at 5:32
The
FOR loop you have used doesn't make any sense,The more command captures the stdin and blocks the execution of the batch code until it terminates by pressing CTRL-Z (or CTRL-C) then you have #%%a java -classpath ... it would be translated to #WhatEverHaveBeenCapturedByMore java -classpath .... What are you trying to achieve with that? Did you get that code from someone or wrote it yourself? "If i start the app directly from cmd.exe, i can read from STDIN without any problems." Just do the same in the batch file as you did in CMD prompt.– sst
Nov 27 '18 at 5:32
I added the thread, i used to build the batch command. My first try was to invoke the Java app from the batch without the <code>FOR</code> loop, but it didn't work. Then i thought maybe it have to be forced, so i used <code>more</code>. I would like to access to STDIN from the Java app, that is invoked from the batch, but it seems, the batch is blocking Java from doing that.
– awgold90
Nov 27 '18 at 9:12
I added the thread, i used to build the batch command. My first try was to invoke the Java app from the batch without the <code>FOR</code> loop, but it didn't work. Then i thought maybe it have to be forced, so i used <code>more</code>. I would like to access to STDIN from the Java app, that is invoked from the batch, but it seems, the batch is blocking Java from doing that.
– awgold90
Nov 27 '18 at 9:12
My next try was to use the command
start to execute the Java application in an other window. This worked well. But after this, i realized that invoking the Java app directly from a batch also worked. I have no imagination, what could be the problem.– awgold90
Nov 28 '18 at 9:00
My next try was to use the command
start to execute the Java application in an other window. This worked well. But after this, i realized that invoking the Java app directly from a batch also worked. I have no imagination, what could be the problem.– awgold90
Nov 28 '18 at 9:00
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Why do you use more (like this)? It captures stdin and does not pass it to any subcommand (java in your case). It might be better to use
java -cp ... | moreinstead, but even then the resulting batch file is hard to use for scripting. (and the purpose of the tokens parsing is not clear to me at all)– eckes
Nov 27 '18 at 3:41
Don't have the answer but this is not a java question, it's a cmd batch question. You want to redirect cmd batch stdin to the process called from within the batch.
– Perdi Estaquel
Nov 27 '18 at 4:51
The
FORloop you have used doesn't make any sense,Themorecommand captures thestdinand blocks the execution of the batch code until it terminates by pressingCTRL-Z(orCTRL-C) then you have#%%a java -classpath ...it would be translated to#WhatEverHaveBeenCapturedByMore java -classpath .... What are you trying to achieve with that? Did you get that code from someone or wrote it yourself?"If i start the app directly from cmd.exe, i can read from STDIN without any problems."Just do the same in the batch file as you did in CMD prompt.– sst
Nov 27 '18 at 5:32
I added the thread, i used to build the batch command. My first try was to invoke the Java app from the batch without the <code>FOR</code> loop, but it didn't work. Then i thought maybe it have to be forced, so i used <code>more</code>. I would like to access to STDIN from the Java app, that is invoked from the batch, but it seems, the batch is blocking Java from doing that.
– awgold90
Nov 27 '18 at 9:12
My next try was to use the command
startto execute the Java application in an other window. This worked well. But after this, i realized that invoking the Java app directly from a batch also worked. I have no imagination, what could be the problem.– awgold90
Nov 28 '18 at 9:00