jspservlet.java

这是一个法律事务所系统源码

/*
 * 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.servlet;

import javax.servlet.Servlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.SingleThreadModel;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.HttpJspPage;
import javax.servlet.jsp.JspFactory;

import java.util.Hashtable;
import java.util.Enumeration;
import java.io.File;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.FileNotFoundException;

import org.apache.jasper.JasperException;
import org.apache.jasper.Constants;
import org.apache.jasper.Options;
import org.apache.jasper.EmbededServletOptions;
import org.apache.jasper.JspCompilationContext;
import org.apache.jasper.JspEngineContext;
import org.apache.jasper.compiler.Mangler;
import org.apache.jasper.runtime.*;

import org.apache.jasper.compiler.Compiler;

import org.apache.tomcat.logging.Logger;

/**
 * The JSP engine (a.k.a Jasper)! 
 *
 * @author Anil K. Vijendran
 * @author Harish Prabandham
 */
public class JspServlet extends HttpServlet {

    class JspServletWrapper {
        Servlet theServlet;
	String jspUri;
	boolean isErrorPage;
	// ServletWrapper will set this 
	Class servletClass;
	
	JspServletWrapper(String jspUri, boolean isErrorPage) {
	    this.jspUri = jspUri;
	    this.isErrorPage = isErrorPage;
	    this.theServlet = null;
	}
	
	private void load() throws JasperException, ServletException {
	    try {
		// Class servletClass = (Class) loadedJSPs.get(jspUri);
		// This is to maintain the original protocol.
		destroy();

		theServlet = (Servlet) servletClass.newInstance();
	    } catch (Exception ex) {
		throw new JasperException(ex);
	    }
	    theServlet.init(JspServlet.this.config);
	    if (theServlet instanceof HttpJspBase)  {
                HttpJspBase h = (HttpJspBase) theServlet;
                h.setClassLoader(JspServlet.this.parentClassLoader);
	    }
	}
	
	private void loadIfNecessary(HttpServletRequest req, HttpServletResponse res) 
            throws JasperException, ServletException, FileNotFoundException 
        {
            // First try context attribute; if that fails then use the 
            // classpath init parameter. 

            // Should I try to concatenate them if both are non-null?

            String cp = (String) context.getAttribute(Constants.SERVLET_CLASSPATH);

            String accordingto;

            if (cp == null || cp.equals("")) {
                accordingto = "according to the init parameter";
                cp = options.getClassPath();
            } else 
                accordingto = "according to the Servlet Engine";
            
            Constants.message("jsp.message.cp_is", 
                              new Object[] { 
                                  accordingto,
                                  cp == null ? "" : cp
                              }, 
                              Logger.INFORMATION);

            if (loadJSP(jspUri, cp, isErrorPage, req, res) 
                    || theServlet == null) {
                load();
            }
	}
	
	public void service(HttpServletRequest request, 
			    HttpServletResponse response,
			    boolean precompile)
	    throws ServletException, IOException, FileNotFoundException 
	{
            try {
                loadIfNecessary(request, response);

		// If a page is to only to be precompiled return.
		if (precompile)
		    return;

		if (theServlet instanceof SingleThreadModel) {
		    // sync on the wrapper so that the freshness
		    // of the page is determined right before servicing
		    synchronized (this) {
			theServlet.service(request, response);
		    }
		} else {
		    theServlet.service(request, response);
		}

            } catch (FileNotFoundException ex) {
		try {
                    if (insecure_TMI) {
                        response.sendError(HttpServletResponse.SC_NOT_FOUND, 
                                           Constants.getString
                                           ("jsp.error.file.not.found.TMI", 
                                            new Object[] {
                                                ex.getMessage()
                                            }));
                    } else {
                        response.sendError(HttpServletResponse.SC_NOT_FOUND, 
                                           Constants.getString
                                           ("jsp.error.file.not.found", 
                                            new Object[] {
                                                // Too Much Information -- ex.getMessage()
                                            }));
                    }
		} catch (IllegalStateException ise) {
                    // logs are presumed to be secure, thus the TMI info can be logged
		    Constants.jasperLog.log(Constants.getString
					    ("jsp.error.file.not.found.TMI",
					     new Object[] {
						 ex.getMessage()
					     }), ex,
					    Logger.ERROR);
		    // rethrow FileNotFoundException so someone higher up can handle
                    if (insecure_TMI)
                        throw ex;
                    else
			throw new FileNotFoundException(Constants.getString
                                           ("jsp.error.file.not.found", 
                                            new Object[] {
                                                // Too Much Information -- ex.getMessage()
                                            }));
		}
                return;
            }
	}

	public void destroy() {
	    if (theServlet != null)
		theServlet.destroy();
	}
    }
	
	
    protected ServletContext context = null;
    protected Hashtable jsps = new Hashtable();
    //    protected Hashtable loadedJSPs = new Hashtable();
    protected ServletConfig config;
    protected JasperLoader loader;
    protected Options options;
    protected ClassLoader parentClassLoader;
    protected ServletEngine engine;
    protected String serverInfo;
    
    /** Set to true to provide Too Much Information on errors */
    private final boolean insecure_TMI = false;

    static boolean firstTime = true;
    static boolean jdk12=false;
    static {
	try {
	    Class.forName( "java.security.PrivilegedAction" );
	    jdk12=true;
	} catch(Throwable ex ) {
	}
    }

    public void init(ServletConfig config)
	throws ServletException
    {
	super.init(config);
	this.config = config;
	this.context = config.getServletContext();
        this.serverInfo = context.getServerInfo();
        
	options = new EmbededServletOptions(config, context);

	parentClassLoader = (ClassLoader) context.getAttribute(Constants.SERVLET_CLASS_LOADER);
	if (parentClassLoader == null)
	    parentClassLoader = this.getClass().getClassLoader();