How to see output on command prompt by running a jar/exe file?

Question

I have created a jar which reads values from excel, does some manipulations and write the results back to excel.

When I run the jar, it works perfectly. I have also created an exe file for the jar and it works very well too.

However, while the values are being calculated for data on each row of the excel, I want the result to be displayed on command prompt too, for which i have syso statements.

I am able to achieve this by creating a batch file and running the jar through .bat file. But when i run the exe file through a bat file, I'm not able to see the calculations on cmd.

Is there any way where I can see the calculated values in runtime through syso statements, on command prompt, just by double clicking on exe file?

PS: I do not want to run the jar through java -jar command on cmd. I want calculation results to be displayed on cmd if i just double click the jar/exe.

Answer 1

Noted down steps how to create a Runnable Jar file from eclipse tool. Oncle you done with below steps, you will get a runnable jar file. If you double click on the jar file, it will start executing your jar file through a command prompt.

• Create a batch file, and placed under any path in your system. In the example "C:\\Users\\username\\Desktop\\test\\my_script.bat"

    @ECHO OFF set java_path=D:\\Java\\jdk1.6.0_41 cd /d D:\\rootFolder\\extractData %java_path%\\bin\\java -jar yourJARfilename.jar cmd /K EXIT /B 0 

  • Create a java project.

  • Create a java a class for executing batch file. Specify your batch file path as coded below.

     package com.cmd.test; import java.io.IOException; public class AutoExeJAR { public static void main(String[] args) { try{ Runtime r=Runtime.getRuntime(); r.exec("cmd.exe /c start call C:\\\\Users\\\\username\\\\Desktop\\\\\\test\\\\my_script"); }catch( IOException ex ){ //Validate the case the file can't be accesed (not enought permissions) }}} 

  • Right click on the above java project --> Export --> Runnable Jar -> (Select the above class file in Launch configuration dropdown in the popup window) -> Give the path for exporting as runnable jar file. NOTE : Selecting your class file name here is specifying invoking point soon after the jar file is double clicked.

  • Double click on that exported runnable jar file which executes the batch file automatically.
  • Please refer the link as well.

Answer 2

There is an option on Launch4J to choose if the output should be displayed on console during runtime! I just selected it and the results are shown on console while running the exe file.

Thank you all for the suggestions.