Java ClassPath Add addToClassPath(Vector cpV, String dir)

Description

Add all the jar files in a dir to the classpath, represented as a Vector of URLs.

License

Apache License

Declaration

public static void addToClassPath(Vector cpV, String dir) 

Method Source Code

//package com.java2s;
/*/*from   ww  w  .  j av  a  2s . c o m*/
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (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.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

import java.io.File;
import java.io.FilenameFilter;

import java.net.URL;

import java.util.Vector;

public class Main {
    /**
     * Add all the jar files in a dir to the classpath, represented as a Vector
     * of URLs.
     */
    public static void addToClassPath(Vector cpV, String dir) {
        try {
            String cpComp[] = getFilesByExt(dir, ".jar");
            if (cpComp != null) {
                int jarCount = cpComp.length;
                for (int i = 0; i < jarCount; i++) {
                    URL url = getURL(dir, cpComp[i]);
                    if (url != null)
                        cpV.addElement(url);
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /**
     * Return all files with a given extension in a dir
     */
    public static String[] getFilesByExt(String ld, String ext) {
        File dir = new File(ld);
        String[] names = null;
        final String lext = ext;
        if (dir.isDirectory()) {
            names = dir.list(new FilenameFilter() {
                public boolean accept(File d, String name) {
                    if (name.endsWith(lext)) {
                        return true;
                    }
                    return false;
                }
            });
        }
        return names;
    }

    /**
     * Construct a file url from a file, using a base dir
     */
    public static URL getURL(String base, String file) {
        try {
            File baseF = new File(base);
            File f = new File(baseF, file);
            String path = f.getCanonicalPath();
            if (f.isDirectory()) {
                path += "/";
            }
            if (!f.exists())
                return null;
            return new URL("file", "", path);
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }
}

Related

1. addPathToClassPath(String s)
2. addToClasspath(File f)
3. addToClassPath(File file)
4. addToClasspath(File file)
5. addToClassPath(String s)