添加到路径，确保生成的路径以“/”开头，而不是以“/”结尾。

/*

 * ? Copyright IBM Corp. 2012-2013

 * 

 * Licensed 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.

 */
// 来自 nowjava.com - 时  代  Java

public class Main{

    /**

     * Add to path ensuring that the resulting path will start with a '/' and

     * doesn't end with a '/'.

     * @ibm-api

     */

    public static String concatPath(String path1, String path2, char sep) {

        StringBuilder b = new StringBuilder();

        if (StringUtil.isNotEmpty(path1)) {

            if (path1.charAt(0) != sep) {

                b.append(sep);

            }

            if (path1.charAt(path1.length() - 1) == sep) {

                b.append(path1, 0, path1.length() - 1);

            } else {

                b.append(path1);

            }

        }

        if (StringUtil.isNotEmpty(path2)) {

            if (path2.charAt(0) != sep) {

                b.append(sep);

            }

            if (pat