receive()会阻塞在readLine()这一行接收消息，如果client发送quit退出的同时，调用了socket.close()，那么readLine()会抛异常，怎样避免呢，或者怎样优雅的处理呢？

public String receive() throws IOException {
        String message = null;
        if (!this.socket.isInputShutdown()) {
            message = this.reader.readLine();
        }
        return message;
    }

quit
java.net.SocketException: Socket closed
	at java.base/java.net.SocketInputStream.read(SocketInputStream.java:183)
	at java.base/java.net.SocketInputStream.read(SocketInputStream.java:140)
	at java.base/sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
	at java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
	at java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
	at java.base/java.io.InputStreamReader.read(InputStreamReader.java:185)
	at java.base/java.io.BufferedReader.fill(BufferedReader.java:161)
	at java.base/java.io.BufferedReader.readLine(BufferedReader.java:326)
	at java.base/java.io.BufferedReader.readLine(BufferedReader.java:392)