java实现已知Host，提取主域名(Guava)

背景

有个需求需要统计某台机器访问其他网站的频次，同一个主域名下的频次需要合并，即例如访问

mp.csdn.net 和 blog.csdn.net 各一次，应该统计为 csdn.net 两次。

引入guava

​​https://mvnrepository.com/artifact/com.google.guava/guava​​

<dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>15.0</version>
            <scope>compile</scope>
 </dependency>

案例

private String dealHost(String host) {
        InternetDomainName domainName = InternetDomainName.from(host);
        String top = domainName.topPrivateDomain().toString();

        return top;
    }

测试

public static void mainHostTest(){
        String urlstr = "https://abc.news.sina.com.cn/123/ref?free=key&kt=3";
        try {
            URL url = new URL(urlstr);
            String host = url.getHost();
            System.out.println("host: "+host);
            InternetDomainName domainName = InternetDomainName.from(host);
            String top = domainName.topPrivateDomain().toString();
            System.out.println("top: "+top);

        } catch (Exception e) {
          e.printStackTrace();
        }
    }

结果

host: abc.news.sina.com.cn
top: sina.com.cn