Java File Extension Name Extract extractFileExtension(String path)

Description

Extract the file extension from the given URI path.

License

Apache License

Parameter

Parameter	Description
path	the URI path (e.g. "/products/index.html")

Return

the extracted file extension (e.g. "html")

Declaration

public static String extractFileExtension(String path) 

Method Source Code

//package com.java2s;
/*/*from   w ww  .j ava  2  s .  com*/
 * Copyright 2002-2016 the original author or authors.
 *
 * 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.
 */

public class Main {
    /**
     * Extract the file extension from the given URI path.
     * @param path the URI path (e.g. "/products/index.html")
     * @return the extracted file extension (e.g. "html")
     * @since 4.3.2
     */
    public static String extractFileExtension(String path) {
        int end = path.indexOf('?');
        if (end == -1) {
            end = path.indexOf('#');
            if (end == -1) {
                end = path.length();
            }
        }
        int begin = path.lastIndexOf('/', end) + 1;
        int paramIndex = path.indexOf(';', begin);
        end = (paramIndex != -1 && paramIndex < end ? paramIndex : end);
        int extIndex = path.lastIndexOf('.', end);
        if (extIndex != -1 && extIndex > begin) {
            return path.substring(extIndex + 1, end);
        }
        return null;
    }
}

Related

1. extractFileExtension(String fileName)
2. extractFileExtension(String filename)
3. extractFileExtension(String filename)
4. extractFileExtension(String fileName)
5. extractFileExtension(String filePath)
6. extractFileExtensionFromPath(String path)
7. getFileExtension(File f)
8. getFileExtension(File file)
9. getFileExtension(File file)