Return the "Version" entry from the given JAR's manifest file. - Java Reflection

Java examples for Reflection:Jar

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Description

Return the "Version" entry from the given JAR's manifest file.

Demo Code

/*//from w  w  w  . jav  a 2 s .c o m
 * Copyright (C) 2006-2007 Mindquarry GmbH, All Rights Reserved
 * 
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 */
//package com.java2s;

import java.io.IOException;

import java.util.jar.JarFile;

public class Main {
    /**
     * Return the "Version" entry from the given JAR's manifest file.
     * @throws IOException
     */
    public static String getVersion(String jarFileName) throws IOException {
        JarFile jarFile = new JarFile(jarFileName);
        return jarFile.getManifest().getMainAttributes()
                .getValue("Version");
    }
}

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