Java關閉Socket來終止執行緒

Java程式碼：

package Threads;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

/**
 * Created by Frank
 */
public class StopClose extends Thread {
    protected Socket io;

    public void run() {
        try {
            io = new Socket("java.sun.com", 80);
            BufferedReader is = new BufferedReader(new InputStreamReader(io.getInputStream()));
            System.out.println("StopClose reading");

            /**
             * 死鎖，因為讀取響應之前，HTTP責成客戶端傳送一個請求（像GET/HTTP/1.0）和一個空行
             */
            String line = is.readLine();

            /**
             * 所以我們永遠不可能到達這裡
             */
            System.out.printf("StopClose FINISHED after reading %s!", line);

        } catch (IOException ex) {
            System.out.println("StopClose terminating:" + ex);
        }
    }

    public void shutDown() throws IOException {
        if (io != null) {
            synchronized (io) {
                io.close();
            }
        }
        System.out.println("StopClose.shutDown() complete");
    }

    public static void main(String[] args) throws InterruptedException, IOException {
        StopClose t = new StopClose();
        t.start();
        sleep(1000*5);
        t.shutDown();
    }
}