Java HTTP Port Find getAvailablePort()

Description

get Available Port

License

Apache License

Declaration

public static int getAvailablePort() 

Method Source Code

//package com.java2s;
/*/*  ww  w  . ja  va2s  .  c o m*/
 * Copyright 1999-2011 Alibaba Group.
 *  
 * 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.io.IOException;
import java.net.*;

import java.util.Random;

public class Main {
    private static final int RND_PORT_START = 30000;
    private static final int RND_PORT_RANGE = 10000;
    private static final Random RANDOM = new Random(System.currentTimeMillis());

    public static int getAvailablePort() {
        ServerSocket ss = null;
        try {
            ss = new ServerSocket();
            ss.bind(null);
            return ss.getLocalPort();
        } catch (IOException e) {
            return getRandomPort();
        } finally {
            if (ss != null) {
                try {
                    ss.close();
                } catch (IOException e) {
                }
            }
        }
    }

    public static int getRandomPort() {
        return RND_PORT_START + RANDOM.nextInt(RND_PORT_RANGE);
    }
}

Related

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9. getAvailablePort()