jsploader.java

低版本的tomcat 对于有些老版本的应用还真的需要老版的中间件

/*
 * ====================================================================
 * 
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */ 

package org.apache.jasper.runtime;

import java.io.FileInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.IOException;

import java.util.Hashtable;
import java.util.Vector;
import java.util.zip.ZipFile;
import java.util.zip.ZipEntry;
import java.net.URL;

import java.security.*;

import org.apache.jasper.JasperException;
import org.apache.jasper.Constants;
import org.apache.jasper.Options;

import org.apache.tomcat.logging.Logger;
import javax.servlet.http.*;
/**
 * Jsp compiler and runtime depends on special features from the
 * ClassLoader.
 *
 *  It has to allow run-time addition of class paths and provide
 *  access to the class path.
 *
 *  The loader is also responsible for detecting changes and reloading.
 *
 * @author Anil K. Vijendran
 * @author Harish Prabandham
 * @author Costin Manolache
 */
public abstract class JspLoader extends ClassLoader {
    protected ClassLoader parent;
    protected Options options;
    //    Object pd;

    /*
     * This should be factoried out
     */
    protected JspLoader() {
	super();
    }

    public void setParentClassLoader( ClassLoader cl) 
    {
	this.parent = cl;
    }

    // The only thing we use is getScratchDir !
    public void setOptions( Options options) {
	this.options = options;
    }

    protected Vector jars = new Vector();
    
    public void addJar(String jarFileName) throws IOException {
        if (!jars.contains(jarFileName)) {
            Constants.message("jsp.message.adding_jar",
                              new Object[] { jarFileName },
                              Logger.INFORMATION);
            
            jars.addElement(jarFileName);
        }
    }
    
    public String getClassPath() {
        StringBuffer cpath = new StringBuffer();
        String sep = System.getProperty("path.separator");

        for(int i = 0; i < jars.size(); i++) {
            cpath.append((String)jars.elementAt(i)+sep);
        }
        
        return cpath.toString();
    }
}