将指定文件添加或删除到现有的jar文件中。

/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *//*来 自 N o  w  J a v a . c o m - 时  代  Java*/

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Enumeration;

import java.util.List;

import java.util.jar.JarEntry;

import java.util.jar.JarFile;

import java.util.jar.JarOutputStream;

import java.util.jar.Manifest;


public class Main{

    /**

     * Add or remove specified files to existing jar file. If a specified file

     * to be updated or added does not exist, the jar entry will be created

     * with the file name itself as the content.

     *

     * @param src the original jar file name

     * @param dest the new jar file name

     * @param files the files to update. The list is broken into 2 groups

     *              by a "-" string. The files before in the 1st group will

     *              be either updated or added. The files in the 2nd group

     *              will be removed. If no "-" exists, all files belong to

     *              the 1st group.

     */

    public static void updateJar(String src, String dest, String... files)

            throws IOException {

        try (JarOutputStream jos = new JarOutputStream(/**来自 N o w J a v a . c o m - 时代Java**/

                new FileOutputStream(dest))) {


            // copy each old entry into destination unless the entry name

            // is in the updated list

            List<String> updatedFiles = new ArrayList<>();

            try (JarFile srcJarFile = new JarFile(src)) {

                Enumeration<JarEntry> entries = srcJarFile.entries();

                while (entries.hasMoreElements()) {

                    JarEntry entry = entries.nextElement();

                    String name = entry.getName();

                    boolean found = false;

                    boolean update = true;

                    for (String file : files) {

                        if (file.equals("-")) {

                            update = false;

                        } else if (name.equals(file)) {

                            updatedFiles.add(file);

                            found = true;

                            break;

                        }

                    }


                    if (found) {

                        if (update) {

                            System.out.println(String.format(

                                    "Updating %s with %s", dest, name));

                            jos.putNextEntry(new JarEntry(name));

                            try (FileInputStream fis = new FileInputStream(

                                    name)) {

                                fis.transferTo(jos);

                            } catch (FileNotFoundException e) {

                                jos.write(name.getBytes());

                            }

                        } else {

                            System.out.println(String.format(

                                    "Removing %s from %s", name, dest));

                        }

                    } else {

                        System.out.println(String.format(

                                "Copying %s to %s", name, dest));

                        jos.putNextEntry(entry);

                        srcJarFile.getInputStream(entry).transferTo(jos);

                    }

                }

            }