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Tomcat example source code file (

This example Tomcat source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

buffer_size, bufferedreader, bufferedreader, couldn't, couldn't, interruptedexception, io, ioexception, printwriter, runtime, ssiexec, ssiinclude, ssiinclude, string, string

The Tomcat source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.catalina.ssi;

import org.apache.catalina.util.IOTools;
 * Implements the Server-side #exec command
 * @author Bip Thelin
 * @author Amy Roh
 * @author Paul Speed
 * @author Dan Sandberg
 * @author David Becker
 * @version $Revision: 531303 $, $Date: 2007-04-23 02:24:01 +0200 (lun., 23 avr. 2007) $
public class SSIExec implements SSICommand {
    protected SSIInclude ssiInclude = new SSIInclude();
    protected final static int BUFFER_SIZE = 1024;

     * @see SSICommand
    public long process(SSIMediator ssiMediator, String commandName,
            String[] paramNames, String[] paramValues, PrintWriter writer) {
        long lastModified = 0;
        String configErrMsg = ssiMediator.getConfigErrMsg();
        String paramName = paramNames[0];
        String paramValue = paramValues[0];
        String substitutedValue = ssiMediator.substituteVariables(paramValue);
        if (paramName.equalsIgnoreCase("cgi")) {
            lastModified = ssiInclude.process(ssiMediator, "include",
                    			new String[]{"virtual"}, new String[]{substitutedValue},
        } else if (paramName.equalsIgnoreCase("cmd")) {
            boolean foundProgram = false;
            try {
                Runtime rt = Runtime.getRuntime();
                Process proc = rt.exec(substitutedValue);
                foundProgram = true;
                BufferedReader stdOutReader = new BufferedReader(
                        new InputStreamReader(proc.getInputStream()));
                BufferedReader stdErrReader = new BufferedReader(
                        new InputStreamReader(proc.getErrorStream()));
                char[] buf = new char[BUFFER_SIZE];
                IOTools.flow(stdErrReader, writer, buf);
                IOTools.flow(stdOutReader, writer, buf);
                lastModified = System.currentTimeMillis();                
            } catch (InterruptedException e) {
                ssiMediator.log("Couldn't exec file: " + substitutedValue, e);
            } catch (IOException e) {
                if (!foundProgram) {
                    //apache doesn't output an error message if it can't find
                    // a program
                ssiMediator.log("Couldn't exec file: " + substitutedValue, e);
        return lastModified;

Other Tomcat examples (source code examples)

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