loaderinterceptor.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/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */


package org.apache.tomcat.context;

import org.apache.tomcat.core.*;
import org.apache.tomcat.core.Constants;
import org.apache.tomcat.request.*;
import org.apache.tomcat.util.*;
import java.io.*;
import java.net.*;
import java.util.*;
import java.security.*;

import org.apache.tomcat.logging.*;
import org.apache.tomcat.loader.*;
/**
 * Set class loader based on WEB-INF/classes, lib.
 * Uses the protection domain - if any, so PolicyInterceptor
 * must be called before it.
 * 
 * This is just an adapter between tomcat and the loader interface.
 * 
 *
 * @author [e-mail]
 */
public class LoaderInterceptor extends BaseInterceptor {

    public LoaderInterceptor() {
    }

    public void contextInit( Context context)
	throws TomcatException
    {
        ContextManager cm = context.getContextManager();
	AdaptiveServletLoader loader=new AdaptiveServletLoader();
	ClassLoader cl= cm.getParentClassLoader();
	if( cl==null ) 
	    loader.setParentLoader(this.getClass().getClassLoader());
	else
	    loader.setParentLoader( cl );
	
	context.setServletLoader( loader );

        String base = context.getDocBase();
	Object p = context.getPermissions();
	Object pd=context.getProtectionDomain();

	// Add "WEB-INF/classes"
	File dir = new File(base + "/WEB-INF/classes");

        // GS, Fix for the jar@lib directory problem.
        // Thanks for Kevin Jones for providing the fix.
        dir = cm.getAbsolute(dir);
	if( dir.exists() ) {
	    loader.addRepository( dir, pd );
        }

        File f = cm.getAbsolute(new File(base + "/WEB-INF/lib"));
	Vector jars = new Vector();
	getJars(jars, f);

	for(int i=0; i < jars.size(); ++i) {
	    String jarfile = (String) jars.elementAt(i);
	    File jarF=new File(f, jarfile );
	    loader.addRepository( cm.getAbsolute( jarF ), pd );
	}
    }

    private void getJars(Vector v, File f) {
        FilenameFilter jarfilter = new FilenameFilter() {
		public boolean accept(File dir, String fname) {
		    if(fname.endsWith(".jar"))
			return true;

		    return false;
		}
	    };
/* Don't include subdirectories. Spec says just WEB-INF/lib/*.jar
        FilenameFilter dirfilter = new FilenameFilter() {
		public boolean accept(File dir, String fname) {
		    File f1 = new File(dir, fname);
		    if(f1.isDirectory())
			return true;

		    return false;
		}
	    };
*/

        if(f.exists() && f.isDirectory() && f.isAbsolute()) {
            String[] jarlist = f.list(jarfilter);

            for(int i=0; (jarlist != null) && (i < jarlist.length); ++i) {
                v.addElement(jarlist[i]);
            }

/* Don't include subdirectories. Spec says just WEB-INF/lib/*.jar
            String[] dirlist = f.list(dirfilter);

            for(int i=0; (dirlist != null) && (i < dirlist.length); ++i) {
                File dir = new File(f, dirlist[i]);
                getJars(v, dir);
            }
*/
        }
    }

}