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项目需要扫描占用的端口来判断服务是否启动，通过查资料发现大多数方法都是ServerSocket socket = new ServerSocket(port);代码如下：
package com.frank.util;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
public class NetUtil {
/***
* true:already in using false:not using
* @param port
*/
public static boolean isLoclePortUsing(int port){
boolean flag = true;
try {
flag = isPortUsing("127.0.0.1", port);
} catch (Exception e) {
}
return flag;
}
/***
* true:already in using false:not using
* @param host
* @param port
* @throws UnknownHostException
*/
public static boolean isPortUsing(String host,int port) throws UnknownHostException{
boolean flag = false;
InetAddress theAddress = InetAddress.getByName(host);
try {
Socket socket = new Socket(theAddress,port);
flag = true;
} catch (IOException e) {
}
return flag;
}
}
经过测试发现如果端口没有占用，此方法的时间消耗比较大，大概在1s左右，如果是循环扫描端口，无疑是无法接受的。
可以用java.net.ServerSocket包的ServerSocket代替Socket去检测端口，方法如下：
public static boolean isPortUsing(String host,int port) throws UnknownHostException{
boolean flag = true;
// InetAddress theAddress = InetAddress.getByName(host);
try {
// Socket socket = new Socket(theAddress,port);
ServerSocket socket = new ServerSocket(port);
flag = false;
socket.close();
} catch (IOException e) {
}
return flag;
}
对Socket等知识研究较少，如有问题，请大家及时提出，尽快改正，谢谢！
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原文地址：http://www.cnblogs.com/superJF/p/5157997.html
