Java提取字符串中的域名或ip

String hostIP = "http://www.baidu.com/s/t";
hostIP = hostIP.replace("http://","").replace("https://","");//去除http和https前綴
String [] arr = hostIP.split("/");//按‘/’分隔，取第一個
hostIP = arr[0];

 

正則提取：

String host1 = "";
Pattern p = Pattern.compile("(?<=//|)((\\w)+\\.)+\\w+");
Matcher matcher = p.matcher(" 10.135.12.32/codes.html#multiple_bindings");
if (matcher.find()) {
    host1 = matcher.group();
}
System.out.println(host1);

 

使用java標準類庫java.net.URL

java.net.URL  url = new  java.net.URL("https://i.cnblogs.com/EditPosts.aspx?postid=9007907");

String host = url.getHost();// 獲取主機名 

System.out.println("host:"+host);// 結果 blog.csdn.net