Mini scripting in Java?

What I want to be able to do is the following.
Lets say we have the following simple method
String echo(String str) {
return str;
}So I want to be able to give Java a piece of String like "echo(\"Hello\")" and get back "Hello".
So in essence I want a mini parser from string to code. This is something scripting languages do (like Groovy) but since Groovy is Java there will be a way to do it with only pure Java.
Thanks

Thanks for your replies.
I think this is the way forward:
[Adding dynamic Java code to your application - Java World|http://www.javaworld.com/javaworld/jw-06-2006/jw-0612-dynamic.html]

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How can i execute vb scripts in java program

hi
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Hi,
You use Runtime.exec to execute commands / exe-files. See the documentation (and remember that it will only work on windows):
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html
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How to call a shell script in Java ?

Hi there,
i try to call a shell script in java but it wont work.
please can anybody help me.
my Code :
import java.io.*;
public class SendMessage{
Runtime rt;
public SendMessage(){
rt = Runtime.getRuntime();
public void send(){
try{
rt.exec("sendMessage.sh");
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catch(IOException ex)
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the exception never cames up but the script also never starts.
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need help !
}

rt.exec("sendMessage.sh");Oh, sorry, I didn't see that you tried under UNIX.
BTW you should check for the OS - this stuff is very os and os release dependent.
I have not experimented with this under unix.
But something must interpret that sendMessage.sh file.
Perhaps the hash bang info is used by exec() (did you put a
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Converting Perl Scripts into Java Servlets

Hello,
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jonhorsman said
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JSP
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How to run Perl script in Java program?

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Hello sabre,
First of all thanks for your reply.
I have tried like what you mentioned.
Eventhough, i could get the exact error message.
I could get the Exception
"Exception:java.lang.IllegalThreadStateException: process hasn't exited"
<code>
import java.io.*;
public class Sample{
public static void main(String args[]) {
String s = null;
Process p;
try
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But it is throwing
"Error opening message catalog 'Logging.cat': No such file or directory
Exception:java.lang.IllegalThreadStateException: process hasn't exited
CommandFailure"
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I dont know what is Logging.cat could you explain me its urgent.
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tskarthikeyan

As i am fresher Please share the doc of ECMA script using java script in SharePoint 2013 also how we can insert,update,delete records in list using ECMA script.

As i am fresher Please share the doc of ECMA script using java script in SharePoint 2013 step by step also how we can insert,update,delete records in list using ECMA script.
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Hi,
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Jason Guo
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Scripting in java

Hi All
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Unix scripting in java

hello
im new to java.
and i need to learn unix scripting in java. is it difficult to learn? can one learn it within a short span of time?! could anyone please give me some links where i can learn.
tks

I run UNIX systems, what do you mean by Java scripting?
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p.s. Go FreeBSD!!

How to execute unix shell script from Java ...

Hi,
Anyone know how to execute unix shell script from Java?
Suppose I have several shell scripts written in perl or tcl or bash.
I just want to catch the output of that script.
Is there any ready to use module/object for this?
Please let me know, this is quite urgent for my study assigment.
Thanks in advance,
Regards,
me

Look up Runtime.exec()

Run a UNIX Script from java

Hi,
how can i run a unix script from java application. This java application is on windows.
How can i do this.
thanks,

Hi,
how can i run a unix script from java application.
This java application is on windows.
So I think it's safe to assume that the target script is on a remote unix server.
Take a look at http://sourceforge.net/projects/sshtools/

Excute unix script from java.

Hi need to excute unix script from java application.
My code is:
public class Test
public static void main(String args[])
try{
p = Runtime.getRuntime().exec("./qfe0"); //qfe0 is the name of the script.
p.waitFor();
catch(Exception e)
e.printStackTrace();
My problem is that using the waitFor() statement stuck the the script. if i don't use the waitFor() it works good but then i don't know when the script is finished.
Any idea?

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How execute Unix script from java?

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Oh, bummer. Would be much more convenient if I could just use iTunes for everything. Can't stand WMP. I wonder if WinAmp might be a good compromise?
Thanks for this answer . . .
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Example: Executing a shell script from java

Hi. There are many other posts in the forums related to executing a unix script from java, but I wanted to post another example that I thought might be helpful...
The key thing to executing the script is to include the -c switch for the sh command. This tells the sh command that you are passing a string to be interpreted as input. Without this switch, the script does not execute as you'd expect it to. Also, use a string array to pass each part of the sh command.
Here is a working sample class, along with a test script to execute it:
public class TestShellScript {
public static void main(String[] args)
String[] chmod = {"chmod","777","testscript1"};
String[] runscript = {"sh","-c","./testscript1 > jdata.out"};
Runtime rtime = Runtime.getRuntime();
try
rtime.exec(chmod); // Set the authorities for testing
rtime.exec(runscript); // Run the script with redirection
catch (IOException e)
e.printStackTrace();
rtime = null;
Here is a test script to wrap the java call:
#!/bin/sh
cd /<your script dir>
export -s CLASSPATH=/<your jar dir>/TestShellScript.jar
export -s PATH=/<your script dir>:/usr/bin
java TestShellScript
- Hope this helps.

I don't know exactly but the code written below is working fine try the same with your code .Even with your code instead running the code with
" ./<filename> ",if you execute it with "sh <filename>" command without changing the mode of the file it is executing properly.
import java.io.*;
import java.util.*;
public class ScriptBuilder
public ScriptBuilder()
public void writeScript() throws java.io.IOException
FileWriter writer = new FileWriter(new File("test_script"));
writer.write("#! /bin/sh\n");
writer.write("ll>/home/faiyaz/javaprac/checkll");
writer.flush();
writer.close();
Runtime rt= Runtime.getRuntime();
rt.exec("chmod 777 test_script");
rt.exec("./test_script");
} public static void main (String[] args)throws java.io.IOException
ScriptBuilder sb = new ScriptBuilder();
sb.writeScript();
}

Mini scripting in Java?

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