如何在android中通过wifi发送固定字符串

WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

if (!wifiManager.isWifiEnabled()) {
    wifiManager.setWifiEnabled(true);
}

WifiInfo wifiInfo = wifiManager.getConnectionInfo();
String ssid = wifiInfo.getSSID(); // 获取WiFi名称
int ipAddress = wifiInfo.getIpAddress(); // 获取IP地址

String serverIP = "192.168.0.100"; // 服务器IP地址
int serverPort = 1234; // 服务器端口号
String message = "Hello, World!"; // 要发送的字符串

try {
    Socket socket = new Socket(serverIP, serverPort);
    PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
    out.println(message);
    socket.close();
} catch (IOException e) {
    e.printStackTrace();
}