Warning: file_get_contents(/data/phpspider/zhask/data//catemap/9/java/345.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181
Java Android-如何验证url和添加http://www_Java_Android - Fatal编程技术网

Java Android-如何验证url和添加http://www

Java Android-如何验证url和添加http://www,java,android,Java,Android,我想验证url字符串并在需要时添加。 url可能是google.com或google.co.in,因此很难在字符串末尾传递 如何操作?如果您只想验证字符串是否为有效URL,可以使用类。示例代码也在那里。如果您只想验证您的字符串是有效的URL,您可以使用类。示例代码也在那里。您可以尝试正则表达式: if (!url.contains("http://www") { url = "http://www" + url; } public static final String URL_REG

我想验证url字符串并在需要时添加。 url可能是google.com或google.co.in,因此很难在字符串末尾传递


如何操作?

如果您只想验证字符串是否为有效URL,可以使用类。示例代码也在那里。

如果您只想验证您的字符串是有效的URL,您可以使用类。示例代码也在那里。

您可以尝试正则表达式:

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

信用证:

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");
}

信用证:

好吧,在我看来,验证URL的最佳方法就是实际尝试。有很多方法可以搞乱URL,然后是http://或https://之类的东西

无论如何,如果您想实际测试URL,以确保其真正有效且实际在线,这里有一个替代方案。是的,我知道这要慢得多,但至少你肯定知道这是好的

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());
            }

        }
    }
}

嗯,在我看来,验证URL的最好方法就是实际尝试。有很多方法可以搞乱URL,然后是http://或https://之类的东西

无论如何,如果您想实际测试URL,以确保其真正有效且实际在线,这里有一个替代方案。是的,我知道这要慢得多,但至少你肯定知道这是好的

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());
            }

        }
    }
}

有很多方法。请发布您的尝试,以便您可以获得更好的帮助。我唯一认为的是使用endswith,但它不会有效…为什么使用endswith?它不是更愿意开始吗?有很多方法。请发布您的尝试,以便您可以获得更好的帮助。我唯一认为的是使用endswith,但它不会有效…为什么使用endswith?它不是更愿意开始吗?