java - 帮助第一个网络程序

Question

这是代码。

public class testClient {
public static void main(String[] args) {
    testClient abc = new testClient();
    abc.go();
}
public void go() {
    try {
        Socket s = new Socket("127.0.0.1",  5000);
        InputStreamReader  sr = new InputStreamReader(s.getInputStream());
        BufferedReader reader = new BufferedReader(sr);
        String x = reader.readLine();
        System.out.println(x);
        reader.close();
    } catch(IOException ex) {
        ex.printStackTrace();
    }
  }
}

public class testServer {
public static void main(String[] args) {
    testServer server = new testServer();
    server.go();
}
public void go() {
    try {
        ServerSocket s = new ServerSocket(5000);
        while(true) {
            Socket sock = s.accept();

            PrintWriter writer = new PrintWriter(sock.getOutputStream());
            String toReturn = "No cake for you.";
            writer.println(toReturn);
        }
    } catch(IOException ex) {
        ex.printStackTrace();
    }
  }
}

java.io.* 和 java.net.* 在两个类中导入。

现在，当我尝试运行这些(使用不同的终端)时，没有任何反应。我做错了什么？

屏幕:http://i29.tinypic.com/250qlmt.jpg

Answer 1

使用 PrintWriter 时需要调用 flush 方法。将您的代码更改为以下并且它有效:)。

public class testServer {
public static void main(String[] args) {
    testServer server = new testServer();
    server.go();
}
public void go() {
    try {
        ServerSocket s = new ServerSocket(5000);
        while(true) {
            Socket sock = s.accept();

            PrintWriter writer = new PrintWriter(sock.getOutputStream());
            String toReturn = "No cake for you.";
            writer.println(toReturn);
            writer.flush();
        }
    } catch(IOException ex) {
        ex.printStackTrace();
    }
  }
}