dnsjava是DNS协议的一个Java开源实现。
示例代码：
Record [] records = new Lookup("gmail.com", Type.MX).run();
for (int i = 0; i < records.length; i++) {
MXRecord mx = (MXRecord) records[i];
System.out.println("Host " + mx.getTarget() + " has preference ", mx.getPriority());
}
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