NET中对url字符串中域名的三种截取方式

水深无声 2021-06-26 16:06 442阅读 0赞

//业务需求：将网站URL地址进行截取，获得网站的主域名。 
    //3种截取方式：切分，indexOf截取，正则表达式截取

代码如下：

public class Test1 { 
        public static void main(String[] args) { 
            String Str = "http://www.baidu.com/free/play?chapterId=766";
            getStr1(Str);
            getStr2(Str);
            getStr3(Str);
    
        }
    
        private static void getStr1(String Str) { 
            //切分
            String regex = "/";
            String[] strings = Str.split(regex);
            //输出结果
            System.out.println(strings[2]);
        }
    
        private static void getStr2(String Str) { 
            String newStr = Str.replace("http://", "");
            String string = newStr.substring(0, newStr.indexOf("/"));
            System.out.println(string);
        }
    
    
        private static String getStr3(String Str) { 
            Pattern pattern = Pattern.compile("[^http://]*?.com");
            Matcher matcher = pattern.matcher(Str);
            while(matcher.find()){ 
                String group = matcher.group();
                System.out.println(group);
            }
            return null;
        }
    }

输出结果：

www.baidu.com

--------------------

## 获取url的第一个`/`的路径 ##

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text.RegularExpressions;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    
    namespace Pro
    { 
        public partial class TEST : System.Web.UI.Page
        { 
            protected void Page_Load(object sender, EventArgs e)
            { 
                string imgurl = "http://img.com/5MA.jpg";
                
                Regex regex = new Regex(@"^(http|https):\/\/[^\/]*\/");
                Match match = regex.Match(imgurl);
                string oldimgurl = imgurl.Replace(match.Value, "");
                //Uri uri = new Uri(fs);
                //Response.Write(uri.AbsolutePath);
                Response.Write(oldimgurl);
                Response.End();
            }
        }
    }