package com.xxl.job.core.util;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.IOException;
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import java.net.ServerSocket;
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/**
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* net util
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*
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* @author xuxueli 2017-11-29 17:00:25
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*/
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public class NetUtil {
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private static Logger logger = LoggerFactory.getLogger(NetUtil.class);
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/**
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* find avaliable port
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*
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* @param defaultPort
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* @return
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*/
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public static int findAvailablePort(int defaultPort) {
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int portTmp = defaultPort;
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while (portTmp < 65535) {
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if (!isPortUsed(portTmp)) {
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return portTmp;
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} else {
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portTmp++;
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}
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}
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portTmp = defaultPort--;
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while (portTmp > 0) {
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if (!isPortUsed(portTmp)) {
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return portTmp;
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} else {
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portTmp--;
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}
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}
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throw new RuntimeException("no available port.");
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}
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/**
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* check port used
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*
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* @param port
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* @return
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*/
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public static boolean isPortUsed(int port) {
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boolean used = false;
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ServerSocket serverSocket = null;
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try {
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serverSocket = new ServerSocket(port);
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used = false;
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} catch (IOException e) {
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logger.info(">>>>>>>>>>> xxl-rpc, port[{}] is in use.", port);
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used = true;
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} finally {
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if (serverSocket != null) {
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try {
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serverSocket.close();
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} catch (IOException e) {
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logger.info("");
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}
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}
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}
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return used;
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}
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}
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