Java URL Value Check isValidURL(String urlStr)

Description

is Valid URL

License

Open Source License

Declaration

public static final boolean isValidURL(String urlStr) 

Method Source Code

//package com.java2s;
/**//from  w  w w. ja  v  a 2 s  .  co m
 * This file is part of the Gribbit Web Framework.
 * 
 *     https://github.com/lukehutch/gribbit
 * 
 * @author Luke Hutchison
 * 
 * --
 * 
 * @license Apache 2.0 
 * 
 * Copyright 2015 Luke Hutchison
 *
 * 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.
 */

import java.net.URI;
import java.net.URISyntaxException;

public class Main {
    public static final boolean isValidURL(String urlStr) {
        return parseURI(urlStr) != null;
    }

    /**
     * Run a URI through the Java URI parser class to validate the URI.
     * 
     * @return the parsed URI, or null if the URI is invalid.
     */
    public static final URI parseURI(String uriStr) {
        // Double-check for XSS-unsafe characters in URIs. Most of these (except for single quote) are
        // caught by the URI parser, but just to be safe we also manually check here.
        for (int i = 0; i < uriStr.length(); i++) {
            char c = uriStr.charAt(i);
            if (c < (char) 33 || c > (char) 126 || c == '<' || c == '>' || c == '\'' || c == '"' || c == '\\') {
                return null;
            }
        }
        try {
            // Returns new URI object if URI parses OK
            return new URI(uriStr);
        } catch (URISyntaxException e) {
            return null;
        }
    }
}

Related

1. isValidUrl(String url)
2. isValidURL(String url)
3. isValidURL(String url)
4. isValidURL(String URL_String)
5. isValidURL(String urlStr)
6. isValidURL(String urlString)
7. isValidUrl(URI uri)
8. isValidURL(URL url)
9. isValidUrlDataType(URL value)