Question

我正在尝试检查是否有几个pors是打开的，如果80端口是打开的 - 发送http请求然后在控制台中显示结果。每个端口都在他自己的线程中检查。

我发送这样的请求

public static void send(Socket sock, String host) throws IOException{
    PrintWriter pw = new PrintWriter(sock.getOutputStream());
    pw.println("GET / HTTP/1.1");
    pw.println("Host: " + host);
    pw.println("");
    pw.flush();
}

在类TCPClient中，我使用它并将结果作为字节返回，然后将其显示为控制台。

    try {
        sock = new Socket(host, port);
        System.out.println("port " + port + " is in use");
        // send request
        HttpSender.send(sock, host);
        BufferedReader bf = new BufferedReader(new InputStreamReader(sock.getInputStream()));
        StringBuffer response = new StringBuffer(); 
        String line = "";
        while((line = bf.readLine()) != null) {
          response.append(line);
          response.append('\r');
        }
        bf.close();
        return String.valueOf(response).getBytes(); // in method run I show it
    } catch (SocketException e) {
        return ("port " + port + " is free").getBytes();
    }

我为端口检查创建了线程池。

public class ThreadPool {

private static int MAX_THREADS = 5;
private static String DESTINATION = "http://stackoverflow.com/";
private ExecutorService es = null;

public ThreadPool() {
    es = Executors.newFixedThreadPool(MAX_THREADS);
}

public void perform(int start, int end) throws UnknownHostException {
    for (int i = start; i <= end; i++) {
        Runnable req = new TCPClient(DESTINATION, i);
        es.execute(req);
    }
    es.shutdown();
    while (!es.isTerminated()) {
    }
    ;
    System.out.println("all ports checked!");
}

}

当我将目的地设置为www.stackoverflow.com并获得包含it was moved permanently to http://stackoverflow.com/的文字的文档时。当我设置此目的地时 - 我已经UnknownhostException。

问题出在哪里？

Answer 1

你试过private static String DESTINATION = "stackoverflow.com";吗？字符串"http://stackoverflow.com"不是主机名，而是URL。

我尝试发送请求时出现未知主机异常

1 个答案: