停止从 readLine() 方法读取被阻止的线程

Question

while (active) {
   String message = reader.readLine();
}


public void stop(){
   active = false;
}

How do i stop this Thread before readLine() return a String ?

Answer 1

As you've likely identified, your boolean check is all well and good, but doesn't work if your thread blocks on network I/O, or is sleeping. Instead you need to interrupt this thread. See here for more details.

Answer 2

In this case, your BufferedReader has to be closed to unblock the reading thread.

public void stop() {
    closeQuietly(reader); // unblock
    active = false;
}

public static void closeQuietly(Closable c) {
    if(c != null)
        try {
            c.close();
        } catch(IOException ignored) { }
}