Question

我使用＆＃34; JAVAMail＆＃34;成功阅读了gmail-email的内容。我能够将它存储在一个字符串中。现在我想从内容（String）获取特定的注册URL。我怎么能这样做，字符串包含大量的标签和href，但我想只提取一个单词的超链接中提供的URL＆＃34;点击这里＆＃34;存在于下面提到的陈述中

"Please <a class="h5" href="https://newstaging.mobilous.com/en/user-register/******" target="_blank">click here</a> to complete your registration".

超链接上的

＆＃34;点击此处＆＃34;网址

HREF =＆＃34; HTTPS：//newstaging.mobilous.com/en/user-register/******"目标=＆＃34; _blank＆＃34;

我已尝试使用以下代码

package email;

import java.util.ArrayList;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.NoSuchProviderException;
import javax.mail.Session;
import javax.mail.Store;

public class emailAccess {

    public static void check(String host, String storeType, String user,
             String password) 
          {
             try {

             //create properties field
             Properties properties = new Properties();

             properties.put("mail.imap.host",host);
             properties.put("mail.imap.port", "993");
             properties.put("mail.imap.starttls.enable", "true");
             properties.setProperty("mail.imap.socketFactory.class","javax.net.ssl.SSLSocketFactory");
               properties.setProperty("mail.imap.socketFactory.fallback", "false");
               properties.setProperty("mail.imap.socketFactory.port",String.valueOf(993));
             Session emailSession = Session.getDefaultInstance(properties);

             //create the POP3 store object and connect with the pop server
             Store store = emailSession.getStore("imap");

             store.connect(host, user, password);

             //create the folder object and open it
             Folder emailFolder = store.getFolder("INBOX");
             emailFolder.open(Folder.READ_ONLY);

             // retrieve the messages from the folder in an array and print it
             Message[] messages = emailFolder.getMessages();
             System.out.println("messages.length---" + messages.length);
                int n=messages.length;
                for (int i = 0; i<n; i++) {
                Message message = messages[i];
                ArrayList<String> links = new ArrayList<String>();
                if(message.getSubject().contains("Thank you for signing up for AppExe")){
                String desc=message.getContent().toString();

              // System.out.println(desc);
              Pattern linkPattern = Pattern.compile(" <a\\b[^>]*href=\"[^>]*>(.*?)</a>",  Pattern.CASE_INSENSITIVE|Pattern.DOTALL);
               Matcher pageMatcher = linkPattern.matcher(desc);

               while(pageMatcher.find()){
                   links.add(pageMatcher.group());
               } 
                }else{
                System.out.println("Email:"+ i + " is not a wanted email");
                }
                for(String temp:links){
                if(temp.contains("user-register")){
                    System.out.println(temp);
                }
                }

                /*System.out.println("---------------------------------");
                System.out.println("Email Number " + (i + 1));
                System.out.println("Subject: " + message.getSubject());
                System.out.println("From: " + message.getFrom()[0]);
                System.out.println("Text: " + message.getContent().toString());*/

             }
             //close the store and folder objects
             emailFolder.close(false);
             store.close();

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


    public static void main(String[] args) {
        // TODO Auto-generated method stub

        String host = "imap.gmail.com";
         String mailStoreType = "imap";
         String username = "rameshakur@gmail.com";
         String password = "*****";

         check(host, mailStoreType, username, password);


    }

}

在执行时我得到了输出

＆LT;类=＆＃34; H5＆＃34; HREF =＆＃34; HTTPS：//newstaging.mobilous.com/en/user-register/******"目标=＆＃34; _blank＆＃34;＆GT;

如何仅提取href值，即https://newstaging.mobilous.com/en/user-register/ ******

请建议，谢谢。

Answer 1

你关闭了。你正在使用group（），但是你有几个问题。这里有一些应该有用的代码，只取代了你所获得的一些代码：

Pattern linkPattern = Pattern.compile(" <a\\b[^>]*href=\"([^\"]*)[^>]*>(.*?)</a>",  Pattern.CASE_INSENSITIVE|Pattern.DOTALL);
Matcher pageMatcher = linkPattern.matcher(desc);
while(pageMatcher.find()){
    links.add(pageMatcher.group(1));
}

我所做的只是改变你的模式，以便它明确地查找href属性的结束引用，然后包裹你在括号中寻找的字符串模式部分。

我还在pageMather.group()方法中添加了一个参数，因为它需要一个参数。

说实话，你可能只是使用这种模式（以及.group(1)更改）：

Pattern linkPattern = Pattern.compile("href=\"([^\"]*)",  Pattern.CASE_INSENSITIVE|Pattern.DOTALL);

如何提取＆＃34;注册＆＃34;来自邮件内容的URL

1 个答案: