How can i call shell command in JSP?

Question

My OS is Linux, and my WWW server is Tomcat,
can i call shell command , such as gcc or setup,
If yes, how can i? Would you give a source example?
Thank you!

Answer 1

Hi,
I did this simple class to launch a process and after the cose there is an example to use it:
import java.io.*;
import java.util.*;
public class ProcessExec {
private String[] command;
private StreamGobbler errorGobbler;
private StreamGobbler outputGobbler;
public ProcessExec() {
public ProcessExec ( String[] command) {
this.command = command;
this.errorGobbler = null;
this.outputGobbler = null;
public String[] getCommand() {
return ( this.command );
public void setCommand( String[] command ) {
this.command = command;
public void exec() {
try{
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec(this.command);
// any error message?
errorGobbler = new StreamGobbler(proc.getErrorStream(), "ERROR");
// any output?
outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT");
// kick them off
errorGobbler.start();
outputGobbler.start();
}catch (Throwable t){
t.printStackTrace();
}//catch
public String getErrorMessage() {
while ( this.errorGobbler.isAlive() ) {;}
return ( this.errorGobbler.getResult().toString() );
public String getOutputMessage() {
while ( this.outputGobbler.isAlive() ) {;}
return ( this.outputGobbler.getResult().toString() );
} // ProcessExec
Example to use it:
try {
ProcessExec pe = new ProcessExec( command );
pe.exec();
errorMessage = pe.getErrorMessage();
outputMessage = pe.getOutputMessage();
} catch ( Exception e ) {
System.out.println (e);
As you can guess the string "command" must be the command you have to launch and errorMessage and outputMessage will contain the error and the output that the process will generate.
Try it; i hope this will help you.
Cheers.
Stefano