添加依赖

implementation ('io.socket:socket.io-client:2.0.0') {
    exclude group: 'org.json', module: 'json'
}

创建一个 Socket 实例

URI uri = URI.create("https://example.com");
IO.Options options = IO.Options.builder()
        // ...
        .build();

Socket socket = IO.socket(uri, options);

Socket socket = IO.socket(URI.create("https://example.com")); // the main namespace
Socket productSocket = IO.socket(URI.create("https://example.com/product")); // the "product" namespace
Socket orderSocket = IO.socket(URI.create("https://example.com/order")); // the "order" namespace

一些默认配置

IO.Options options = IO.Options.builder()
    // IO factory options
    .setForceNew(false)
    .setMultiplex(true)

    // low-level engine options
    .setTransports(new String[] { Polling.NAME, WebSocket.NAME })
    .setUpgrade(true)
    .setRememberUpgrade(false)
    .setPath("/socket.io/")
    .setQuery(null)
    .setExtraHeaders(null)

    // Manager options
    .setReconnection(true)
    .setReconnectionAttempts(Integer.MAX_VALUE)
    .setReconnectionDelay(1_000)
    .setReconnectionDelayMax(5_000)
    .setRandomizationFactor(0.5)
    .setTimeout(20_000)

    // Socket options
    .setAuth(null)
    .build();

https://socketio.github.io/socket.io-client-java/initialization.html