用JAVA写个简易的DNS域名查询工具

在加入GE之前没怎么写过JAVA程序, 其实JAVA挺好的, API多, 而且跨平台, 并且速度也不慢 (已经优化很多了).

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最近用到了 iNetAddress 这个库, 写了一命令行工具, 可以简易根据域名查询 IP 地址.

代码也在 https://github.com/DoctorLai/DNSLookup

import java.net.InetAddress;
import java.net.UnknownHostException;
 
public class DNSLookup {
  // https://helloacm.com/the-dns-lookup-tool-in-java-inetaddress/
  public static void main(String args[]) {
    try {
      InetAddress host;
      if (args.length == 0) {
        host = InetAddress.getLocalHost();
        displayHost(host);
      } else {
        for (int i = 0; i < args.length; ++ i) {
          host = InetAddress.getByName(args[i]);
          displayHost(host);
        }
      }      
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
  }
 
  private static void displayHost(InetAddress host) {
    System.out.println("Host:'" + host.getHostName()
          + "' has address: " + host.getHostAddress());    
  }
}

import java.net.InetAddress;
import java.net.UnknownHostException;

public class DNSLookup {
  // https://helloacm.com/the-dns-lookup-tool-in-java-inetaddress/
  public static void main(String args[]) {
    try {
      InetAddress host;
      if (args.length == 0) {
        host = InetAddress.getLocalHost();
        displayHost(host);
      } else {
        for (int i = 0; i < args.length; ++ i) {
          host = InetAddress.getByName(args[i]);
          displayHost(host);
        }
      }      
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
  }

  private static void displayHost(InetAddress host) {
    System.out.println("Host:'" + host.getHostName()
          + "' has address: " + host.getHostAddress());    
  }
}

通过 javac DNSLookup.java 命令编译成 DNSLookup.class (或者下载提前编译好的). 然后就可以通过以下例子来查询一个或者多个域名了

# java DNSLookup
Host:'HP-PC' has address: 192.168.0.102

HP@HP-PC D:\
# java DNSLookup localhost
Host:'localhost' has address: 127.0.0.1

HP@HP-PC D:\
# java DNSLookup localhost www.google.com
Host:'localhost' has address: 127.0.0.1
Host:'www.google.com' has address: 216.58.201.36

简单好用.

英文: The DNS Lookup Tool in Java (InetAddress)

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用JAVA写个简易的DNS域名查询工具. (AMP 移动加速版本)
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用JAVA写个简易的DNS域名查询工具

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