各顾各

如果端口不可用，捕获异常
try
{
ServerSocket testPort = new ServerSocket(8282);
}
catch(Exception ex)
{
ex.printStackTrace();
}

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netstat -ano

------其他回答（1分）---------

在windows命令行窗口下执行：

>netstat -aon|findstr "8000"

TCP 127.0.0.1:8000 0.0.0.0:0 LISTENING 4292

看到了吗，端口被进程号(PID)为4292的进程占用，继续执行下面命令：

>tasklist|findstr "4292"

python.exe*32

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mark一下，我一直也想做个程序监视各个端口，并且能得到流量

------其他回答（1分）---------

try
{
ServerSocket testPort = new ServerSocket(8282);
}
catch(Exception ex)
{
ex.printStackTrace();
}

------其他回答（40分）---------

Java code

public class TestPort
{

    public static void main(String[] args)
    {
        System.out.println(getPID("3306"));//得到进程ID,3306是端口名称
        System.out.println(getProgramName(getPID("3306")));//根据进程ID得到映像名称
        killTask(getProgramName(getPID("3306")));//根据映像名称关闭进程
    }
    
    
    // 得到进程ID
    public static String getPID(String port){
        InputStream is = null;
        BufferedReader br = null;
        String pid = null;
        try
        {
            String[] args = new String[]{"cmd.exe","/c","netstat -aon|findstr",port};
            is = Runtime.getRuntime().exec(args).getInputStream();
            br = new BufferedReader(new InputStreamReader(is));
            String temp = br.readLine();
            if(temp != null){
                String[] strs = temp.split("\\s");
                pid=strs[strs.length-1];
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }finally{
            try
            {
                br.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
        return pid;
    }
    
    //根据进程ID得到映像名称
    public static String getProgramName(String pid){
        InputStream is = null;
        BufferedReader br = null;
        String programName = null;
        try
        {
            String[] args = new String[]{"cmd.exe","/c","tasklist|findstr",pid};
            is = Runtime.getRuntime().exec(args).getInputStream();
            br = new BufferedReader(new InputStreamReader(is));
            String temp = br.readLine();
            if(temp != null){
                String[] strs = temp.split("\\s");
                programName=strs[0];
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }finally{
            try
            {
                br.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
        return programName;
    }
    
    //根据映像名称关闭进程
    public static void killTask(String programName){
        String[] args = new String[]{"Taskkill","/f","/IM",programName};
        try
        {
            Runtime.getRuntime().exec(args);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}