java socket编程开发简单例子 与 nio非阻塞通道

// 客户端
public static void main(String[] args) {
try (Scanner scan = new Scanner(System.in);
Socket client = new Socket("127.0.0.1", 8484);
PrintWriter writer = new PrintWriter(client.getOutputStream());
BufferedReader reader = new BufferedReader(new InputStreamReader(client.getInputStream()));) {
while (true) {
// writer.print(scan.nextLine() + "\n");
// Writer 的 write(scan.nextLine() + "\n");方法
// 注意：由于服务器端是使用readLine，如果是用上面两种方式写入，必须加换行符，否则readLine是读取不到数据的
writer.println(scan.nextLine());
writer.flush();
while (reader.ready()) {
System.out.println(reader.readLine());
}
}
} catch (IOException e) {
e.printStackTrace();
}
}

// 服务端
public static void main(String[] args) {
try (Scanner scan = new Scanner(System.in);
ServerSocket server = new ServerSocket(8484);
Socket sc = server.accept();
BufferedReader reader = new BufferedReader(new InputStreamReader(sc.getInputStream()));
PrintWriter writer = new PrintWriter(sc.getOutputStream());) {
while (true) {
writer.println(scan.nextLine());
writer.flush();
while (reader.ready()) {
System.out.println(reader.readLine());
}
} } catch (Exception e) {
e.printStackTrace();
}
}