Question

我想验证网址字符串，并在需要时添加http://www。该网址可能是＆＃34; google.com＆＃34;或＆＃34; google.co.in＆＃34;所以很难在字符串的末尾进行中继。

我该怎么做？

Answer 1

if (!url.contains("http://www") {
    url = "http://www" + url;
}

Answer 2

您可以尝试正则表达式：

public static final String URL_REGEX = "^((https?|ftp)://|(www|ftp)\\.)?[a-z0-9-]+(\\.[a-z0-9-]+)+([/?].*)?$";

Pattern p = Pattern.compile(URL_REGEX);
Matcher m = p.matcher("example.com");//replace with string to compare
if(m.find()) {
    System.out.println("String contains URL");
}

信用：https://stackoverflow.com/a/11007981/4211264

Answer 3

嗯，在我看来，验证网址的最佳方法是实际尝试。有很多方法搞砸了网址，然后是http：//或http s ：//的东西。

无论如何，如果您想要实际测试URL以确保它真正有效并且实际上是在线，那么这里是另一种选择。是的，我知道它要慢得多，但至少你肯定知道这很好。

以下是基本代码：

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.UnknownHostException;

public class ValidateURL {


    public static void main(String[] args) {

        String urlString = "https://www.google.com";

        // Make sure "http://" or "https://" is located
        // at the beginning of the supplied URL.
        if (urlString.matches("((http)[s]?(://).*)")) {
            try {
                final URL url = new URL(urlString);
                HttpURLConnection huc = (HttpURLConnection) url.openConnection();
                int responseCode = huc.getResponseCode();
                if (responseCode != 200) {
                    System.out.println("There was a problem connecting to:\n\n" + 
                            urlString + "\n\nResponse Code: [" + responseCode + "]");
                }
                System.out.println("The supplied URL is GOOD!"); 
            }  
            catch (UnknownHostException | MalformedURLException ex) { 
                System.out.println("Either the supplied URL is good or\n" + 
                        "there is No Network Connection!\n" + urlString);
            } 
            catch (IOException ex) { 
                System.out.println(ex.getMessage());
            }

        }
    }
}

Answer 4

如果您只想验证String是否为有效URL，则可以使用Apache Validator类。示例代码也在那里。

Android - 如何验证网址并添加http：// www

4 个答案: