create Jar - Java Reflection

Java examples for Reflection:Jar

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Description

create Jar

Demo Code

/* Copyright (C) 2004 - 2008  Versant Inc.  http://www.db4o.com

This file is part of the sharpen open source java to c# translator.

sharpen is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at//from  ww  w.j a v a  2 s . co  m
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

sharpen 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, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
//package com.java2s;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class Main {
    public static String createJar(Class<?>... cookies) throws Exception {
        File file = java.io.File.createTempFile("sharpen", ".jar");
        java.io.FileOutputStream fos = new java.io.FileOutputStream(file);
        try {
            fillJar(fos, cookies);
        } finally {
            fos.close();
        }
        return file.getAbsolutePath();
    }

    private static void fillJar(java.io.FileOutputStream fos,
            Class<?>... cookies) throws Exception {
        ZipOutputStream out = new ZipOutputStream(fos);
        try {
            for (Class<?> clazz : cookies) {
                writeJarEntry(out, clazz);
            }
        } finally {
            out.close();
        }
    }

    private static void writeJarEntry(ZipOutputStream out, Class<?> clazz)
            throws Exception {
        ZipEntry ze = new ZipEntry(fileName(clazz));
        out.putNextEntry(ze);
        out.write(readBytes(clazz));
        out.closeEntry();
    }

    private static String fileName(Class<?> clazz) {
        return clazz.getName().replace('.', '/') + ".class";
    }

    private static byte[] readBytes(Class<?> clazz) throws IOException {
        String resourceName = "/" + fileName(clazz);
        InputStream stream = clazz.getResourceAsStream(resourceName);
        try {
            byte[] buffer = new byte[stream.available()];
            stream.read(buffer);
            return buffer;
        } finally {
            stream.close();
        }
    }
}

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