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Android - 在网络中查找服务器

发布于 2024-10-08 15:30:09 字数 82 浏览 1 评论 0原文

我目前正在编写一个客户端-服务器应用程序，我问自己是否有更好的方法来在本地网络中查找服务器，然后遍历所有可用的 IP 地址并查看是否提供了正确的答案？

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凉城凉梦凉人心 2024-10-15 15:30:09

您可能想要研究 UDP 广播，其中您的服务器会自我宣布，并且手机会侦听广播。

有一个来自 Boxee 远程项目的示例，如下所述。

获取广播地址

您需要访问 wifi 管理器以获取 DHCP 信息并从中构建广播地址：

InetAddress getBroadcastAddress() throws IOException {
    WifiManager wifi = mContext.getSystemService(Context.WIFI_SERVICE);
    DhcpInfo dhcp = wifi.getDhcpInfo();
    // handle null somehow

    int broadcast = (dhcp.ipAddress & dhcp.netmask) | ~dhcp.netmask;
    byte[] quads = new byte[4];
    for (int k = 0; k < 4; k++)
      quads[k] = (byte) ((broadcast >> k * 8) & 0xFF);
    return InetAddress.getByAddress(quads);
}

发送和接收 UDP 广播数据包

构建了广播地址后，一切正常。以下代码将通过广播发送字符串数据，然后等待响应：

DatagramSocket socket = new DatagramSocket(PORT);
socket.setBroadcast(true);
DatagramPacket packet = new DatagramPacket(data.getBytes(), data.length(),
    getBroadcastAddress(), DISCOVERY_PORT);
socket.send(packet);

byte[] buf = new byte[1024];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);

您还可以查看 Bonjour/zeroconf，其中有一个 Java 实现，应该可以在 Android 上运行。

You might want to look into UDP broadcasts, where your server announces itself and the phone listens for the broadcasts.

There is an example from the Boxee remote project, quoted below.

Getting the Broadcast Address

You need to access the wifi manager to get the DHCP info and construct a broadcast address from that:

InetAddress getBroadcastAddress() throws IOException {
    WifiManager wifi = mContext.getSystemService(Context.WIFI_SERVICE);
    DhcpInfo dhcp = wifi.getDhcpInfo();
    // handle null somehow

    int broadcast = (dhcp.ipAddress & dhcp.netmask) | ~dhcp.netmask;
    byte[] quads = new byte[4];
    for (int k = 0; k < 4; k++)
      quads[k] = (byte) ((broadcast >> k * 8) & 0xFF);
    return InetAddress.getByAddress(quads);
}

Sending and Receiving UDP Broadcast Packets

Having constructed the broadcast address, things work as normal. The following code would send the string data over broadcast and then wait for a response:

DatagramSocket socket = new DatagramSocket(PORT);
socket.setBroadcast(true);
DatagramPacket packet = new DatagramPacket(data.getBytes(), data.length(),
    getBroadcastAddress(), DISCOVERY_PORT);
socket.send(packet);

byte[] buf = new byte[1024];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);

You could also look into Bonjour/zeroconf, and there is a Java implementation that should work on Android.

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