java socket编程开发简单例子

1、以下只是简单例子，没有用多线程处理，只能一发一收(由于scan.nextLine()线程会进入等待状态)，使用时可以根据具体项目功能进行优化处理

2、以下代码使用了1.8新特性，如果要测试以下代码，java版本不能低于1.8

    // 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();
        }
    }