invokerinterceptor.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

/*
 * ====================================================================
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 * The Apache Software License, Version 1.1
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 * 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. 
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 *    the documentation and/or other materials provided with the
 *    distribution.
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 *    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.
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package org.apache.tomcat.request;

import org.apache.tomcat.util.*;
import org.apache.tomcat.core.*;
import org.apache.tomcat.facade.*;
import org.apache.tomcat.core.Constants;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 *
 * @author James Duncan Davidson [[e-mail]]
 * @author Jason Hunter [[e-mail]]
 * @author James Todd [[e-mail]]
 * @author Costin Manolache
 */
public class InvokerInterceptor extends BaseInterceptor {

    String prefix="/servlet/";
    int prefixLen=prefix.length();

    public String getPrefix() {
        return (prefix);
    }

    public void setPrefix(String prefix) {
        this.prefix = prefix;
	this.prefixLen = prefix.length();
    }

    public int requestMap(Request req) {
	// If we have an explicit mapper - return
	Container ct=req.getContainer();

	// 	log( "Ct: " + ct.getHandler() + " " +
// 	     ct.getPath() + " " + ct.getMapType());
	
	if(  req.getWrapper()!=null &&
	     ct!=null &&
	     ct.getMapType() != Container.DEFAULT_MAP )
	    return 0;
	
	// default servlet / container
	
	// if doesn't starts with /servlet - return
	String pathInfo = req.getPathInfo();
	String servletPath=req.getServletPath();
	
	// Now we need to fix path info and servlet path
	if( servletPath == null ||
	    ! servletPath.startsWith( prefix ))
	    return 0;

	Context ctx=req.getContext();
	// Set the wrapper, and add a new mapping - next time
	// we'll not have to do that ( the simple mapper is
	// supposed to be faster )
	
	String servletName = null;
	String newPathInfo = null;
	
	if( debug>0 )
	    log( "Original ServletPath=" +servletPath +
		 " PathInfo=" + pathInfo);

	int secondSlash=servletPath.indexOf("/", prefixLen );
	if ( secondSlash > -1) {
	    servletName = servletPath.substring(prefixLen, secondSlash );
	    newPathInfo = servletPath.substring( secondSlash );
	} else {
	    servletName = servletPath.substring( prefixLen );
	}
	
	String newServletPath = prefix + servletName;

	if( debug > 0)
	    log( "After pathfix SN=" + servletName +
		 " SP=" + newServletPath +
		 " PI=" + newPathInfo);
	
	ServletWrapper wrapper = ctx.getServletByName(servletName);
 	req.setServletPath(newServletPath);
	req.setPathInfo(newPathInfo);
	
	if (wrapper != null) {
	    req.setWrapper( wrapper );
	    return 0;
	}
	    
	// Dynamic add for the wrapper
	
	// even if the server doesn't supports dynamic mappings,
	// we'll avoid the interceptor for include() and
	// it's a much cleaner way to construct the servlet and
	// make sure all interceptors are up to date.
	try {
	    wrapper = ctx.addServlet( servletName, servletName );
	    ctx.addServletMapping( newServletPath + "/*" ,
				   servletName );
	    wrapper.setOrigin( ServletWrapper.ORIGIN_INVOKER );
	    if( debug > 0)
		log( "Added mapping " + wrapper +
		     " path=" + newServletPath + "/*" );
	} catch( TomcatException ex ) {
	    ex.printStackTrace();
	    return 404;
	}

	req.setWrapper( wrapper );
	return 0;
    }
    

}