TCP Client

Creating a TCP client

最简单的创建TCP客户端的方式是使用默认的NetClientOptions：

NetClient client = vertx.createNetClient();

Configuring a TCP client

如果你不想要使用默认的NetClientOptions配置,那么你可以创建一个NetClientOptions实例进行TCP客户端创建：

NetClientOptions options = new NetClientOptions().setConnectTimeout(10000);
NetClient client = vertx.createNetClient(options);

Making connections

为了和服务器创建一个连接,你需要使用connect方法,在该方法中需要指定hsot和port,同时需要设置一个handler,当连接成功或者失败之后,handler会获得一个NetSocket的参数.

NetClientOptions options = new NetClientOptions().setConnectTimeout(10000);
NetClient client = vertx.createNetClient(options);
client.connect(4321, "localhost", res -> {
  if (res.succeeded()) {
    System.out.println("Connected!");
    NetSocket socket = res.result();
  } else {
    System.out.println("Failed to connect: " + res.cause().getMessage());
  }
});

Configuring connection attempts

A client can be configured to automatically retry connecting to the server in the event that it cannot connect. This is configured with setReconnectInterval and setReconnectAttempts. 客户端可以被配制成当连接不成功的时候在event里自动响应服务器的应答. 通过setReconnectInterval和setReconnectAttempts来设置这种机制.

NOTE Currently Vert.x will not attempt to reconnect if a connection fails, reconnect attempts and interval only apply to creating initial connections. 注意：当连接失败之后,Vertx不会尝试自动重连,

NetClientOptions options = new NetClientOptions();
options.setReconnectAttempts(10).setReconnectInterval(500);
NetClient client = vertx.createNetClient(options);

在默认情况下,创建多个连接是会失败的.