求助：如何正确将Jsoup的abs:href结果存入数组并遍历

Hey there! Let's fix this issue you're having with storing Jsoup's abs:href values into an array instead of a space-separated string. I've seen this common mistake before, so let's break it down step by step.

First, let's pinpoint what's likely going wrong: you're probably concatenating each URL into a single string with spaces instead of adding each one as a separate element to a collection or array. Here's how to fix it properly:

Step 1: Use a Flexible Collection First #

Since we don't know how many URLs we'll get upfront, an ArrayList<String> is ideal—it grows dynamically, unlike a fixed-size array.

Step 2: Extract and Store Each abs:href #

Loop through your Jsoup-selected elements, grab each abs:href value, and add it directly to the list as a distinct entry.

Step 3: Convert the Collection to a String Array #

Once you've collected all URLs, convert the list to a String[] array if you need that specific type for your use case.

Full Code Example #

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.util.ArrayList;
import java.util.List;

private static String[] extractLinks(String targetUrl) {
    List<String> linkList = new ArrayList<>();
    
    try {
        // Connect to the target URL and parse the document
        Document doc = Jsoup.connect(targetUrl).get();
        // Select all anchor tags that have an href attribute
        Elements anchorTags = doc.select("a[href]");
        
        for (Element tag : anchorTags) {
            // Get the absolute URL from the href attribute
            String absoluteLink = tag.absUrl("href");
            // Add each URL to our list as a separate element
            linkList.add(absoluteLink);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    
    // Convert the list to a String array and return it
    return linkList.toArray(new String[0]);
}

How to Traverse the Resulting Array #

Once you have the array, you can loop through it to use each URL individually:

public static void main(String[] args) {
    String[] websiteAddresses = extractLinks("https://example.com");
    
    // Loop through the array to process each URL
    for (String address : websiteAddresses) {
        System.out.println(address);
    }
}

Why Your Original Code Failed #

Chances are you had code that looked like this (which creates a space-separated string instead of an array):

// Incorrect approach that builds a single string
String linksAsString = "";
for (Element tag : anchorTags) {
    linksAsString += tag.absUrl("href") + " ";
}

This just appends each URL to a single string with spaces, rather than storing each as a separate array element. Using a list first fixes this because every URL gets its own entry in the collection.

内容的提问来源于stack exchange，提问作者Joshua Trimm