Question

我正在尝试用Java创建一个非常简单的Socket / ServerSocket程序。下面列出了我的两个类，它们都在同一台机器上运行。问题是，连接似乎建立得很好，但是当我尝试将套接字从客户端写入服务器时，似乎没有任何事情发生。服务器永远不会从in.readLine()返回，程序停止运行。我无法弄清楚为什么会这样。

以下是我的课程：

TheServer.java：

public class TheServer {
  public static void main(String[] args) {
    BufferedReader in = null;
    PrintWriter out = null;

    try {
        ServerSocket serv = new ServerSocket(2255);
        Socket sock = serv.accept();
        in = new BufferedReader(
                new InputStreamReader(sock.getInputStream()));
        out = new PrintWriter(sock.getOutputStream());

    } catch (IOException e) {
        e.printStackTrace();
    }

    System.out.println("Connection established by Server");

    try {
        String line;
        while ((line = in.readLine()) != "Bye") {
            System.out.println(line + "Received");
            out.println(line.toUpperCase());
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

  }
}

TheClient.java：

public class theClient {
  public static void main(String[] args) {
    BufferedReader in = null;
    PrintWriter out = null;

    try {
        Socket sock = new Socket("localhost", 2255);
        in = new BufferedReader(
                new InputStreamReader(sock.getInputStream()));
        out = new PrintWriter(sock.getOutputStream());
    } catch (Exception e) {
        e.printStackTrace();
    }

    System.out.println("Connection established by Client");

    try {
        while (true) {
            BufferedReader read = new BufferedReader(new InputStreamReader(
                    System.in));
            String line = read.readLine();
            out.println(line.trim());
            System.out.println(in.readLine().trim());

            if (line == "Bye")
                break;
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

  }
}

Answer 1

对于PrintWriter对象，在每次写入尝试后，

    obj.flush();

Java中的基本Socket编程

1 个答案: