void
rdataFromString(Tokenizer st, Name origin) throws IOException {
	priority = st.getUInt16();
	weight = st.getUInt16();
	port = st.getUInt16();
	target = st.getName(origin);
}
Creates an SRV Record from the given data
@param priority The priority of this SRV.  Records with lower priority
are preferred.
@param weight The weight, used to select between records at the same
priority.
@param port The TCP/UDP port that the service uses
@param target The host running the service
src/main/java/core/org/xbill/DNS/SRVRecord.java