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A-Jetty Base can run on Android Java as well as on standard Java 7+ and it can run precompiled JSP/JSTL.
//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.server;
import java.io.IOException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import javax.servlet.DispatcherType;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.util.Attributes;
import org.eclipse.jetty.util.MultiMap;
public class Dispatcher implements RequestDispatcher
{
/** Dispatch include attribute names */
public final static String __INCLUDE_PREFIX="javax.servlet.include.";
/** Dispatch include attribute names */
public final static String __FORWARD_PREFIX="javax.servlet.forward.";
private final ContextHandler _contextHandler;
private final String _uri;
private final String _path;
private final String _query;
private final String _named;
public Dispatcher(ContextHandler contextHandler, String uri, String pathInContext, String query)
{
_contextHandler=contextHandler;
_uri=uri;
_path=pathInContext;
_query=query;
_named=null;
}
public Dispatcher(ContextHandler contextHandler, String name) throws IllegalStateException
{
_contextHandler=contextHandler;
_named=name;
_uri=null;
_path=null;
_query=null;
}
@Override
public void forward(ServletRequest request, ServletResponse response) throws ServletException, IOException
{
forward(request, response, DispatcherType.FORWARD);
}
public void error(ServletRequest request, ServletResponse response) throws ServletException, IOException
{
forward(request, response, DispatcherType.ERROR);
}
@Override
public void include(ServletRequest request, ServletResponse response) throws ServletException, IOException
{
Request baseRequest=(request instanceof Request)?((Request)request):HttpChannel.getCurrentHttpChannel().getRequest();
if (!(request instanceof HttpServletRequest))
request = new ServletRequestHttpWrapper(request);
if (!(response instanceof HttpServletResponse))
response = new ServletResponseHttpWrapper(response);
final DispatcherType old_type = baseRequest.getDispatcherType();
final Attributes old_attr=baseRequest.getAttributes();
final MultiMap old_query_params=baseRequest.getQueryParameters();
try
{
baseRequest.setDispatcherType(DispatcherType.INCLUDE);
baseRequest.getResponse().include();
if (_named!=null)
{
_contextHandler.handle(_named,baseRequest, (HttpServletRequest)request, (HttpServletResponse)response);
}
else
{
IncludeAttributes attr = new IncludeAttributes(old_attr);
attr._requestURI=_uri;
attr._contextPath=_contextHandler.getContextPath();
attr._servletPath=null; // set by ServletHandler
attr._pathInfo=_path;
attr._query=_query;
if (_query!=null)
baseRequest.mergeQueryParameters(_query, false);
baseRequest.setAttributes(attr);
_contextHandler.handle(_path, baseRequest, (HttpServletRequest)request, (HttpServletResponse)response);
}
}
finally
{
baseRequest.setAttributes(old_attr);
baseRequest.getResponse().included();
baseRequest.setQueryParameters(old_query_params);
baseRequest.resetParameters();
baseRequest.setDispatcherType(old_type);
}
}
protected void forward(ServletRequest request, ServletResponse response, DispatcherType dispatch) throws ServletException, IOException
{
Request baseRequest=(request instanceof Request)?((Request)request):HttpChannel.getCurrentHttpChannel().getRequest();
Response base_response=baseRequest.getResponse();
base_response.resetForForward();
if (!(request instanceof HttpServletRequest))
request = new ServletRequestHttpWrapper(request);
if (!(response instanceof HttpServletResponse))
response = new ServletResponseHttpWrapper(response);
final boolean old_handled=baseRequest.isHandled();
final String old_uri=baseRequest.getRequestURI();
final String old_context_path=baseRequest.getContextPath();
final String old_servlet_path=baseRequest.getServletPath();
final String old_path_info=baseRequest.getPathInfo();
final String old_query=baseRequest.getQueryString();
final MultiMap old_query_params=baseRequest.getQueryParameters();
final Attributes old_attr=baseRequest.getAttributes();
final DispatcherType old_type=baseRequest.getDispatcherType();
try
{
baseRequest.setHandled(false);
baseRequest.setDispatcherType(dispatch);
if (_named!=null)
{
_contextHandler.handle(_named, baseRequest, (HttpServletRequest)request, (HttpServletResponse)response);
}
else
{
ForwardAttributes attr = new ForwardAttributes(old_attr);
//If we have already been forwarded previously, then keep using the established
//original value. Otherwise, this is the first forward and we need to establish the values.
//Note: the established value on the original request for pathInfo and
//for queryString is allowed to be null, but cannot be null for the other values.
if (old_attr.getAttribute(FORWARD_REQUEST_URI) != null)
{
attr._pathInfo=(String)old_attr.getAttribute(FORWARD_PATH_INFO);
attr._query=(String)old_attr.getAttribute(FORWARD_QUERY_STRING);
attr._requestURI=(String)old_attr.getAttribute(FORWARD_REQUEST_URI);
attr._contextPath=(String)old_attr.getAttribute(FORWARD_CONTEXT_PATH);
attr._servletPath=(String)old_attr.getAttribute(FORWARD_SERVLET_PATH);
}
else
{
attr._pathInfo=old_path_info;
attr._query=old_query;
attr._requestURI=old_uri;
attr._contextPath=old_context_path;
attr._servletPath=old_servlet_path;
}
baseRequest.setRequestURI(_uri);
baseRequest.setContextPath(_contextHandler.getContextPath());
baseRequest.setServletPath(null);
baseRequest.setPathInfo(_uri);
if (_query!=null)
baseRequest.mergeQueryParameters(_query, true);
baseRequest.setAttributes(attr);
_contextHandler.handle(_path, baseRequest, (HttpServletRequest)request, (HttpServletResponse)response);
if (!baseRequest.getHttpChannelState().isAsync())
commitResponse(response,baseRequest);
}
}
finally
{
baseRequest.setHandled(old_handled);
baseRequest.setRequestURI(old_uri);
baseRequest.setContextPath(old_context_path);
baseRequest.setServletPath(old_servlet_path);
baseRequest.setPathInfo(old_path_info);
baseRequest.setQueryString(old_query);
baseRequest.setQueryParameters(old_query_params);
baseRequest.resetParameters();
baseRequest.setAttributes(old_attr);
baseRequest.setDispatcherType(old_type);
}
}
private void commitResponse(ServletResponse response, Request baseRequest) throws IOException
{
if (baseRequest.getResponse().isWriting())
{
try
{
response.getWriter().close();
}
catch (IllegalStateException e)
{
response.getOutputStream().close();
}
}
else
{
try
{
response.getOutputStream().close();
}
catch (IllegalStateException e)
{
response.getWriter().close();
}
}
}
private class ForwardAttributes implements Attributes
{
final Attributes _attr;
String _requestURI;
String _contextPath;
String _servletPath;
String _pathInfo;
String _query;
ForwardAttributes(Attributes attributes)
{
_attr=attributes;
}
/* ------------------------------------------------------------ */
@Override
public Object getAttribute(String key)
{
if (Dispatcher.this._named==null)
{
if (key.equals(FORWARD_PATH_INFO))
return _pathInfo;
if (key.equals(FORWARD_REQUEST_URI))
return _requestURI;
if (key.equals(FORWARD_SERVLET_PATH))
return _servletPath;
if (key.equals(FORWARD_CONTEXT_PATH))
return _contextPath;
if (key.equals(FORWARD_QUERY_STRING))
return _query;
}
if (key.startsWith(__INCLUDE_PREFIX))
return null;
return _attr.getAttribute(key);
}
@Override
public Enumeration getAttributeNames()
{
HashSet set=new HashSet<>();
Enumeration e=_attr.getAttributeNames();
while(e.hasMoreElements())
{
String name=e.nextElement();
if (!name.startsWith(__INCLUDE_PREFIX) &&
!name.startsWith(__FORWARD_PREFIX))
set.add(name);
}
if (_named==null)
{
if (_pathInfo!=null)
set.add(FORWARD_PATH_INFO);
else
set.remove(FORWARD_PATH_INFO);
set.add(FORWARD_REQUEST_URI);
set.add(FORWARD_SERVLET_PATH);
set.add(FORWARD_CONTEXT_PATH);
if (_query!=null)
set.add(FORWARD_QUERY_STRING);
else
set.remove(FORWARD_QUERY_STRING);
}
return Collections.enumeration(set);
}
@Override
public void setAttribute(String key, Object value)
{
if (_named==null && key.startsWith("javax.servlet."))
{
if (key.equals(FORWARD_PATH_INFO))
_pathInfo=(String)value;
else if (key.equals(FORWARD_REQUEST_URI))
_requestURI=(String)value;
else if (key.equals(FORWARD_SERVLET_PATH))
_servletPath=(String)value;
else if (key.equals(FORWARD_CONTEXT_PATH))
_contextPath=(String)value;
else if (key.equals(FORWARD_QUERY_STRING))
_query=(String)value;
else if (value==null)
_attr.removeAttribute(key);
else
_attr.setAttribute(key,value);
}
else if (value==null)
_attr.removeAttribute(key);
else
_attr.setAttribute(key,value);
}
@Override
public String toString()
{
return "FORWARD+"+_attr.toString();
}
@Override
public void clearAttributes()
{
throw new IllegalStateException();
}
@Override
public void removeAttribute(String name)
{
setAttribute(name,null);
}
}
private class IncludeAttributes implements Attributes
{
final Attributes _attr;
String _requestURI;
String _contextPath;
String _servletPath;
String _pathInfo;
String _query;
IncludeAttributes(Attributes attributes)
{
_attr=attributes;
}
@Override
public Object getAttribute(String key)
{
if (Dispatcher.this._named==null)
{
if (key.equals(INCLUDE_PATH_INFO)) return _pathInfo;
if (key.equals(INCLUDE_SERVLET_PATH)) return _servletPath;
if (key.equals(INCLUDE_CONTEXT_PATH)) return _contextPath;
if (key.equals(INCLUDE_QUERY_STRING)) return _query;
if (key.equals(INCLUDE_REQUEST_URI)) return _requestURI;
}
else if (key.startsWith(__INCLUDE_PREFIX))
return null;
return _attr.getAttribute(key);
}
@Override
public Enumeration getAttributeNames()
{
HashSet set=new HashSet<>();
Enumeration e=_attr.getAttributeNames();
while(e.hasMoreElements())
{
String name=e.nextElement();
if (!name.startsWith(__INCLUDE_PREFIX))
set.add(name);
}
if (_named==null)
{
if (_pathInfo!=null)
set.add(INCLUDE_PATH_INFO);
else
set.remove(INCLUDE_PATH_INFO);
set.add(INCLUDE_REQUEST_URI);
set.add(INCLUDE_SERVLET_PATH);
set.add(INCLUDE_CONTEXT_PATH);
if (_query!=null)
set.add(INCLUDE_QUERY_STRING);
else
set.remove(INCLUDE_QUERY_STRING);
}
return Collections.enumeration(set);
}
@Override
public void setAttribute(String key, Object value)
{
if (_named==null && key.startsWith("javax.servlet."))
{
if (key.equals(INCLUDE_PATH_INFO)) _pathInfo=(String)value;
else if (key.equals(INCLUDE_REQUEST_URI)) _requestURI=(String)value;
else if (key.equals(INCLUDE_SERVLET_PATH)) _servletPath=(String)value;
else if (key.equals(INCLUDE_CONTEXT_PATH)) _contextPath=(String)value;
else if (key.equals(INCLUDE_QUERY_STRING)) _query=(String)value;
else if (value==null)
_attr.removeAttribute(key);
else
_attr.setAttribute(key,value);
}
else if (value==null)
_attr.removeAttribute(key);
else
_attr.setAttribute(key,value);
}
@Override
public String toString()
{
return "INCLUDE+"+_attr.toString();
}
@Override
public void clearAttributes()
{
throw new IllegalStateException();
}
@Override
public void removeAttribute(String name)
{
setAttribute(name,null);
}
}
}