Java Minecraft-Bukkit插座
我试图获取远程服务器的MOTD,但无法获取颜色。当MOTD上色时,插件不工作。 我知道为什么,但我不知道如何解决它Java Minecraft-Bukkit插座,java,sockets,ping,minecraft,bukkit,Java,Sockets,Ping,Minecraft,Bukkit,我试图获取远程服务器的MOTD,但无法获取颜色。当MOTD上色时,插件不工作。 我知道为什么,但我不知道如何解决它 public PingServer(String host, int port) { this.host = host; this.port = port; try { socket.connect(new InetSocketAddress(host, port)); OutputStream out = socket.g
public PingServer(String host, int port) {
this.host = host;
this.port = port;
try {
socket.connect(new InetSocketAddress(host, port));
OutputStream out = socket.getOutputStream();
InputStream in = socket.getInputStream();
out.write(0xFE);
int b;
StringBuffer str = new StringBuffer();
while ((b = in.read()) != -1) {
if (b != 0 && b > 16 && b != 255 && b != 23 && b != 24) {
str.append((char) b);
}
}
data = str.toString().split("§");
data[0] = data[0].substring(1, data[0].length());
} catch (IOException e) {
e.printStackTrace();
}
}
根据,插件将得到如下响应:
MOTD§ONLINEPLAYERS§MAXPLAYERS
,应该在§
上拆分以获得不同的部分。然而,§
也用于,我不知道如何区分这两者。如何解决此问题?您当前使用的是,专为beta版设计的。通过仅向服务器发送FE
即可触发该事件。虽然当前的服务器仍然支持此ping,但它非常旧,并且有几个缺陷(包括您发现的那个)
相反,您应该执行以下操作。虽然这稍微复杂一些,但您不需要实现协议的大部分内容来实际执行它
您只需要了解协议的一个复杂部分:VarInt
s。这些有点复杂,因为它们根据值使用不同的字节数。因此,数据包的长度可能有点难以计算
/** See http://wiki.vg/Protocol_version_numbers. 47 = 1.8.x */
private static final int PROTOCOL_VERSION_NUMBER = 47;
private static final int STATUS_PROTOCOL = 1;
private static final JsonParser PARSER = new JsonParser();
/** Pings a server, returning the MOTD */
public static String pingServer(String host, int port) {
this.host = host;
this.port = port;
try {
socket.connect(new InetSocketAddress(host, port));
OutputStream out = socket.getOutputStream();
InputStream in = socket.getInputStream();
byte[] hostBytes = host.getBytes("UTF-8");
int handshakeLength =
varIntLength(0) + // Packet ID
varIntLength(PROTOCOL_VERSION_NUMBER) + // Protocol version number
varIntLength(hostBytes.length) + hostBytes.length + // Host
2 + // Port
varIntLength(STATUS_PROTOCOL); // Next state
writeVarInt(handshakeLength, out);
writeVarInt(0, out); // Handshake packet
writeVarInt(PROTOCOL_VERSION_NUMBER, out);
writeVarInt(hostBytes.length, out);
out.write(hostBytes);
out.write((port & 0xFF00) >> 8);
out.write(port & 0xFF);
writeVarInt(STATUS_PROTOCOL, out);
writeVarInt(varIntLength(0));
writeVarInt(0); // Request packet (has no payload)
int packetLength = readVarInt(in);
int payloadLength = readVarInt(in);
byte[] payloadBytes = new int[payloadLength];
int readLength = in.read(payloadBytes);
if (readLength < payloadLength) {
throw new RuntimeException("Unexpected end of stream");
}
String payload = new String(payloadBytes, "UTF-8");
// Now you need to parse the JSON; this is using GSON
// See https://github.com/google/gson
// and http://www.javadoc.io/doc/com.google.code.gson/gson/2.8.0
JsonObject element = (JsonObject) PARSER.parse(payload);
JsonElement description = element.get("description");
// This is a naive implementation; it assumes a specific format for the description
// rather than parsing the entire chat format. But it works for the way the
// notchian server impmlements the ping.
String motd = ((JsonObject) description).get("text").getAsString();
return motd;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
public static int varIntLength(int value) {
int length = 0;
do {
// Note: >>> means that the sign bit is shifted with the rest of the number rather than being left alone
value >>>= 7;
length++;
} while (value != 0);
}
public static void writeVarInt(int value, OutputStream out) {
do {
byte temp = (byte)(value & 0b01111111);
// Note: >>> means that the sign bit is shifted with the rest of the number rather than being left alone
value >>>= 7;
if (value != 0) {
temp |= 0b10000000;
}
out.write(temp);
} while (value != 0);
}
public static int readVarInt(InputStream in) {
int numRead = 0;
int result = 0;
int read;
do {
read = in.read();
if (read < 0) {
throw new RuntimeException("Unexpected end of stream");
}
int value = (read & 0b01111111);
result |= (value << (7 * numRead));
numRead++;
if (numRead > 5) {
throw new RuntimeException("VarInt is too big");
}
} while ((read & 0b10000000) != 0);
return result;
}
但是,我仍然不建议使用传统的ping。请指定一些示例以及它们应该如何解码。您使用的是旧的MC版本吗?从1.6开始就没有这样过。真的没有。我使用的是1.8.8,我可以说这个方法很有效。只有颜色…:(你有更好的主意吗?Xan-好吧,假设Motd是§ALOBY(绿色标题游说团),在线玩家是1,最大玩家是50。结果:§aLobby§1§50,所以拆分现在不起作用,因为Motd不是数据[0],而是数据[1]MOTD不是彩色的,但看起来是这样的:aLobbyOh,您正在执行传统服务器列表ping。您不应该这样做,因为它是为传统客户端设计的,并且丢失了很多信息(可能包括颜色)。请参阅。您不再需要在
§
上拆分,因此嵌入颜色代码的问题将不再存在(它将正确地存储在JSON blob中)。
String legacyPingResult = str.toString();
String[] data = new String[3];
int splitPoint2 = legacyPingResult.lastIndexOf('§');
int splitPoint1 = legacyPingResult.lastIndexOf('§', splitPoint2 - 1);
data[0] = legacyPingResult.substring(0, splitPoint1);
data[1] = legacyPingResult.substring(splitPoint1 + 1, splitPoint2);
data[2] = legacyPingResult.substring(splitPoint2 + 1);