逍遥阁

java之DNS操作

关键词: dns

java之DNS操作

```
package dry.test;

import javax.naming.Context;
import javax.naming.directory.Attributes;
import javax.naming.directory.InitialDirContext;
import java.net.InetAddress;
import java.util.Properties;

/**
 * @author zc
 */
public class Dns {

public static void main(String[] args) {
        //查询域名解析的ip地址
        System.out.println(getIpByDomain("a.com"));
        //假设a.com解析了cname记录指向b.com，那么结果为b.com
        System.out.println(getCnameByDomain("a.com"));
    }

public static String getIpByDomain(String domain) {
        try {
            return InetAddress.getByName(domain).getHostAddress();
        } catch (Exception e) {
            return "";
        }
    }

public static String getCnameByDomain(String domain) {
        try {
            Properties p = new Properties();
            p.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.dns.DnsContextFactory");
            InitialDirContext idc = new InitialDirContext(p);
            Attributes a = idc.getAttributes(domain, new String[]{"CNAME"});
            return a.get("CNAME").get().toString();
        } catch (Exception e) {
            return "";
        }
    }

}
```

admin
2021-09-29 21:31:43
phantoscope

文章分类

文章标签

文章归档

友情链接

java之DNS操作