Shell commands from JSP after Forms migration

Question

During application migration from forms 9i to JSP & BC4J, I have to code the following Forms code into my JSP application.This is for a button pressed trigger.
DECLARE
RENAME_STRING VARCHAR2(120):= 'RENAME C:\BRC\PDATA' ||:DRAWING_ACCOUNTS.ACCOUNT_ID|| '.TXT P' || :DRAWING_ACCOUNTS.ACCOUNT_ID || TO_CHAR(SYSDATE,'DDMMYY')|| '.txt';
BEGIN
HOST( RENAME_STRING, no_screen );
web.show_document( 'http://hostname/selectfile.html', '_new');
     IF NOT Form_Success THEN
          Message('Error -- File not Renamed.');
     END IF;
END;
How can I do this simple sending of OS commands in JSP, any ideas?

Answer 1

Hi,
Not only rename commands but I have to pass several other os commands like 'sqlldr' for data upload as well. Therefore, I need a reusable piece of code for that. I have acheived some way for that using the following code.
put the following file in that package.
package BankrecBC4J;
import java.util.*;
import java.io.*;
import java.net.*;
import java.text.*;
import java.util.zip.*;
class StreamGobbler extends Thread
InputStream is;
String type;
StreamGobbler(InputStream is, String type)
this.is = is;
this.type = type;
public void run()
try
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
System.out.println(type + ">" + line);
} catch (IOException ioe)
ioe.printStackTrace();
public class GoodWindowsExec
private static final boolean NATIVE_COMMANDS = true;
//Allow browsing and file manipulation only in certain directories
     private static final boolean RESTRICT_BROWSING = false;
//If true, the user is allowed to browse only in RESTRICT_PATH,
//if false, the user is allowed to browse all directories besides RESTRICT_PATH
private static final boolean RESTRICT_WHITELIST = false;
//Paths, sperated by semicolon
//private static final String RESTRICT_PATH = "C:\\CODE;E:\\"; //Win32: Case important!!
     private static final String RESTRICT_PATH = "/etc;/var";
     * Command of the shell interpreter and the parameter to run a programm
     private static final String[] COMMAND_INTERPRETER = {"cmd", "/C"}; // Dos,Windows
     //private static final String[] COMMAND_INTERPRETER = {"/bin/sh","-c"};      // Unix
     * Max time in ms a process is allowed to run, before it will be terminated
private static final long MAX_PROCESS_RUNNING_TIME = 30 * 1000; //30 seconds
     //Normally you should not change anything after this line
     //Change this to locate the tempfile directory for upload (not longer needed)
     private static String tempdir = ".";
     private static String VERSION_NR = "1.1a";
     private static DateFormat dateFormat = DateFormat.getDateTimeInstance();
public GoodWindowsExec(String g)
System.out.println(" hello " + g);
/*if (g.length < 1)
System.out.println("USAGE: java GoodWindowsExec <cmd>");
System.exit(1);
try
String osName = System.getProperty("os.name" );
String[] cmd = new String[3];
System.out.println("here ");
if( osName.equals( "Windows NT" ) )
cmd[0] = "cmd.exe" ;
cmd[1] = "/C" ;
cmd[2] = g;
else if( osName.equals( "Windows 2000" ) )
System.out.println("Windows 2000");
cmd[0] = "command.com" ;
cmd[1] = "/C" ;
cmd[2] = g;
else if( osName.equals( "Windows XP" ) )
System.out.println("Windows XP");
cmd[0] = "command.com" ;
cmd[1] = "/C" ;
cmd[2] = g;
else if( osName.equals( "Windows 95" ) )
cmd[0] = "command.com" ;
cmd[1] = "/C" ;
cmd[2] = g;
Runtime rt = Runtime.getRuntime();
System.out.println("Execing " + cmd[0] + " " + cmd[1]
+ " " + cmd[2]);
Process proc = rt.exec(cmd);
     * Starts a native process on the server
     *      @param command the command to start the process
     *     @param dir the dir in which the process starts
// any error message?
StreamGobbler errorGobbler = new
StreamGobbler(proc.getErrorStream(), "ERROR");
// any output?
StreamGobbler outputGobbler = new
StreamGobbler(proc.getInputStream(), "OUTPUT");
// kick them off
errorGobbler.start();
outputGobbler.start();
// any error???
int exitVal = proc.waitFor();
System.out.println("ExitValue: " + exitVal);
} catch (Throwable t)
t.printStackTrace();
     * Converts some important chars (int) to the corresponding html string
     static String conv2Html(int i) {
          if (i == '&') return "&amp;";
          else if (i == '<') return "&lt;";
          else if (i == '>') return "&gt;";
          else if (i == '"') return "&quot;";
          else return "" + (char) i;
static String startProcess(String command, String dir) throws IOException {
          StringBuffer ret = new StringBuffer();
          String[] comm = new String[3];
          comm[0] = COMMAND_INTERPRETER[0];
          comm[1] = COMMAND_INTERPRETER[1];
          comm[2] = command;
          long start = System.currentTimeMillis();
          try {
               //Start process
               Process ls_proc = Runtime.getRuntime().exec(comm, null, new File(dir));
               //Get input and error streams
               BufferedInputStream ls_in = new BufferedInputStream(ls_proc.getInputStream());
               BufferedInputStream ls_err = new BufferedInputStream(ls_proc.getErrorStream());
               boolean end = false;
               while (!end) {
                    int c = 0;
                    while ((ls_err.available() > 0) && (++c <= 1000)) {
                         ret.append(conv2Html(ls_err.read()));
                    c = 0;
                    while ((ls_in.available() > 0) && (++c <= 1000)) {
                         ret.append(conv2Html(ls_in.read()));
                    try {
                         ls_proc.exitValue();
                         //if the process has not finished, an exception is thrown
                         //else
                         while (ls_err.available() > 0)
                              ret.append(conv2Html(ls_err.read()));
                         while (ls_in.available() > 0)
                              ret.append(conv2Html(ls_in.read()));
                         end = true;
                    catch (IllegalThreadStateException ex) {
                         //Process is running
                    //The process is not allowed to run longer than given time.
                    if (System.currentTimeMillis() - start > MAX_PROCESS_RUNNING_TIME) {
                         ls_proc.destroy();
                         end = true;
                         ret.append("!!!! Process has timed out, destroyed !!!!!");
                    try {
                         Thread.sleep(50);
                    catch (InterruptedException ie) {}
          catch (IOException e) {
               ret.append("Error: " + e);
          return ret.toString();
In the first line of the JSP file include the package
<%@page import="BankrecBC4J.*" %>
and call
it this way:from the jsp page
new GoodWindowsExec ("calc"); //
which should open up the calciulator, and should do for other os commands as well.
Thanks