add JAR Entry - Java Reflection

Java examples for Reflection:Jar

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Description

add JAR Entry

Demo Code

/**/*from   w  w w  .  ja va2  s  . c o  m*/
 * Tangara is an educational platform to get started with programming.
 * Copyright (C) 2008 Colombbus (http://www.colombbus.org)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;
import java.util.zip.ZipEntry;
import org.apache.log4j.Logger;

public class Main{
    /** Class logger */
    private static Logger LOG = Logger.getLogger(JARUtils.class);
    public static void addJAREntry(JarOutputStream jarOut,
            String entryName, File sourceFile) throws Exception {
        try {
            JarEntry entry = new JarEntry(entryName);
            entry.setSize(sourceFile.length());
            entry.setMethod(ZipEntry.DEFLATED);
            jarOut.putNextEntry(entry);
            FileInputStream sourceFileIn = new FileInputStream(sourceFile);
            copyStream(sourceFileIn, jarOut);
            jarOut.closeEntry();
        } catch (IOException e) {
            String msg = "Access error while saving JAR file";
            LOG.warn(msg, e);
            throw new Exception(msg, e);
        }
    }
    private static void copyStream(InputStream in, OutputStream out)
            throws IOException {
        BufferedInputStream source = new BufferedInputStream(in);
        int read;
        byte[] buffer = new byte[4096];
        while ((read = source.read(buffer)) != -1) {
            out.write(buffer, 0, read);
        }
    }
}

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