Build a fully qualified URL from the pieces provided. - Java Network

Java examples for Network:URL

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Description

Build a fully qualified URL from the pieces provided.

Demo Code

/**/*from w w  w.  j  a v  a 2s. c  o  m*/
 * Copyright (c) 2000-2016 Liferay, Inc. All rights reserved.
 *
 * 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.
 */
//package com.java2s;

public class Main {
    /**
     * Build a fully qualified URL from the pieces provided. This method does not call any encoding methods, so the path
     * argument has to be properly encoded.
     *
     * @param   scheme  server protocol.
     * @param   host    server name.
     * @param   port    server port.
     * @param   path    properly encoded relative URL.
     *
     * @throws  IllegalArgumentException  if scheme, host or port is null.
     */
    public static String buildUrlAsString(String scheme, String host,
            int port, String path) {

        if ((scheme == null) || scheme.equals("") || (host == null)
                || host.equals("") || (port == 0)) {
            throw new IllegalArgumentException(
                    "Cannot build a URL using following scheme: " + scheme
                            + " host: " + host + " port: " + port
                            + " path: " + path);
        }

        StringBuilder url = new StringBuilder(200);

        url.append(scheme).append("://").append(host);

        // check for protocol default port number
        if ((scheme.equalsIgnoreCase("http") && (port != 80))
                || (scheme.equalsIgnoreCase("https") && (port != 443))) {
            url.append(":").append(port);
        }

        if (path != null) {
            url.append(path);
        }

        return url.toString();
    }
}

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