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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.util.resource;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
import java.util.jar.Manifest;
import org.eclipse.jetty.util.IO;
import org.eclipse.jetty.util.URIUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
public class JarResource extends URLResource
{
private static final Logger LOG = Log.getLogger(JarResource.class);
protected JarURLConnection _jarConnection;
/* -------------------------------------------------------- */
protected JarResource(URL url)
{
super(url,null);
}
/* ------------------------------------------------------------ */
protected JarResource(URL url, boolean useCaches)
{
super(url, null, useCaches);
}
/* ------------------------------------------------------------ */
@Override
public synchronized void close()
{
_jarConnection=null;
super.close();
}
/* ------------------------------------------------------------ */
@Override
protected synchronized boolean checkConnection()
{
super.checkConnection();
try
{
if (_jarConnection!=_connection)
newConnection();
}
catch(IOException e)
{
LOG.ignore(e);
_jarConnection=null;
}
return _jarConnection!=null;
}
/* ------------------------------------------------------------ */
/**
* @throws IOException Sub-classes of JarResource may throw an IOException (or subclass)
*/
protected void newConnection() throws IOException
{
_jarConnection=(JarURLConnection)_connection;
}
/* ------------------------------------------------------------ */
/**
* Returns true if the represented resource exists.
*/
@Override
public boolean exists()
{
if (_urlString.endsWith("!/"))
return checkConnection();
else
return super.exists();
}
/* ------------------------------------------------------------ */
@Override
public File getFile()
throws IOException
{
return null;
}
/* ------------------------------------------------------------ */
@Override
public InputStream getInputStream()
throws java.io.IOException
{
checkConnection();
if (!_urlString.endsWith("!/"))
return new FilterInputStream(getInputStream(false))
{
@Override
public void close() throws IOException {this.in=IO.getClosedStream();}
};
URL url = new URL(_urlString.substring(4,_urlString.length()-2));
InputStream is = url.openStream();
return is;
}
/* ------------------------------------------------------------ */
@Override
public void copyTo(File directory)
throws IOException
{
if (!exists())
return;
if(LOG.isDebugEnabled())
LOG.debug("Extract "+this+" to "+directory);
String urlString = this.getURL().toExternalForm().trim();
int endOfJarUrl = urlString.indexOf("!/");
int startOfJarUrl = (endOfJarUrl >= 0?4:0);
if (endOfJarUrl < 0)
throw new IOException("Not a valid jar url: "+urlString);
URL jarFileURL = new URL(urlString.substring(startOfJarUrl, endOfJarUrl));
String subEntryName = (endOfJarUrl+2 < urlString.length() ? urlString.substring(endOfJarUrl + 2) : null);
boolean subEntryIsDir = (subEntryName != null && subEntryName.endsWith("/")?true:false);
if (LOG.isDebugEnabled())
LOG.debug("Extracting entry = "+subEntryName+" from jar "+jarFileURL);
try (InputStream is = jarFileURL.openConnection().getInputStream();
JarInputStream jin = new JarInputStream(is))
{
JarEntry entry;
boolean shouldExtract;
while((entry=jin.getNextJarEntry())!=null)
{
String entryName = entry.getName();
if ((subEntryName != null) && (entryName.startsWith(subEntryName)))
{
// is the subentry really a dir?
if (!subEntryIsDir && subEntryName.length()+1==entryName.length() && entryName.endsWith("/"))
subEntryIsDir=true;
//if there is a particular subEntry that we are looking for, only
//extract it.
if (subEntryIsDir)
{
//if it is a subdirectory we are looking for, then we
//are looking to extract its contents into the target
//directory. Remove the name of the subdirectory so
//that we don't wind up creating it too.
entryName = entryName.substring(subEntryName.length());
if (!entryName.equals(""))
{
//the entry is
shouldExtract = true;
}
else
shouldExtract = false;
}
else
shouldExtract = true;
}
else if ((subEntryName != null) && (!entryName.startsWith(subEntryName)))
{
//there is a particular entry we are looking for, and this one
//isn't it
shouldExtract = false;
}
else
{
//we are extracting everything
shouldExtract = true;
}
if (!shouldExtract)
{
if (LOG.isDebugEnabled())
LOG.debug("Skipping entry: "+entryName);
continue;
}
String dotCheck = entryName.replace('\\', '/');
dotCheck = URIUtil.canonicalPath(dotCheck);
if (dotCheck == null)
{
if (LOG.isDebugEnabled())
LOG.debug("Invalid entry: "+entryName);
continue;
}
File file=new File(directory,entryName);
if (entry.isDirectory())
{
// Make directory
if (!file.exists())
file.mkdirs();
}
else
{
// make directory (some jars don't list dirs)
File dir = new File(file.getParent());
if (!dir.exists())
dir.mkdirs();
// Make file
try (OutputStream fout = new FileOutputStream(file))
{
IO.copy(jin,fout);
}
// touch the file.
if (entry.getTime()>=0)
file.setLastModified(entry.getTime());
}
}
if ((subEntryName == null) || (subEntryName != null && subEntryName.equalsIgnoreCase("META-INF/MANIFEST.MF")))
{
Manifest manifest = jin.getManifest();
if (manifest != null)
{
File metaInf = new File (directory, "META-INF");
metaInf.mkdir();
File f = new File(metaInf, "MANIFEST.MF");
try (OutputStream fout = new FileOutputStream(f))
{
manifest.write(fout);
}
}
}
}
}
public static Resource newJarResource(Resource resource) throws IOException
{
if (resource instanceof JarResource)
return resource;
return Resource.newResource("jar:" + resource + "!/");
}
}