多个HTML表行上的Java循环

请注意,我不是Java专家,但是如果可能的话,我将非常感谢任何帮助和指导。

我有一段Java代码,它读取文件的内容,并使用JSOUP将其解析为html。然后我需要将一个表转换为JSON。第一行成功转换,但以下行均未转换。

我确信我忽略了一些简单的东西,因此非常感谢您的指导/帮助。

package html_to_json_parser;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.json.JSONObject;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;


public class HTML_to_JSON_parser {


public static void main(String[] args) throws IOException {

    InputStream is = new FileInputStream("skills_table.html"); 
    BufferedReader buf = new BufferedReader(new InputStreamReader(is)); 
    String line = buf.readLine(); 
    StringBuilder sb = new StringBuilder(); 

    while(line != null){
        sb.append(line).append("\n");
        line = buf.readLine(); 
    }

    String htmlFile = sb.toString(); 

    Document doc = Jsoup.parse(htmlFile);
    JSONObject jsonObject = new JSONObject();
    JSONObject jsonParentObject = new JSONObject();
    Element table = doc.select("table").first();
    Elements row = table.getElementsByTag("tr");        

        for (int j = 0, k = row.size(); j < k; j++) {

            Elements cols = row.select("td");
            String skill = cols.get(0).text();
            String beginner = cols.get(1).text();
            String intermediate = cols.get(2).text();
            String advanced = cols.get(3).text();
            jsonObject.put("Beginner", beginner);
            jsonObject.put("Intermediate", intermediate);
            jsonObject.put("Advanced", advanced);
            jsonParentObject.put(skill,jsonObject);
         }

    System.out.println(jsonParentObject.toString());

    }

}

需要转换为JSON的HTML表:

<table>
  <thead>
    <tr>
      <th>Skill</th>
      <th>Beginner</th>
      <th>Intermediate</th>
      <th>Advanced</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Reading</td>
      <td>✔</td>
      <td>✔</td>
      <td>✔</td>
    </tr>
    <tr>
      <td>Speaking</td>
      <td>◯</td>
      <td>✔</td>
      <td>✔</td>
    </tr>
    <tr>
      <td>Writing</td>
      <td>◯</td>
      <td>◯</td>
      <td>✔</td>
    </tr>
    <tr>
      <td>Interacting</td>
      <td>●</td>
      <td>●</td>
      <td>● ●</td>
    </tr>
  </tbody>
</table>

需要JSON输出:

[
    {
        "skill": "reading",
        "beginner": "✔",
        "intermediate": "✔",
        "advanced": "✔"
    },
    {
        "skill": "writing",
        "beginner": "◯",
        "intermediate": "✔",
        "advanced": "✔"
    },
    {
        "skill": "speaking",
        "beginner": "◯",
        "intermediate": "◯",
        "advanced": "✔"
    },
    {
        "skill": "interacting",
        "beginner": "●",
        "intermediate": "●",
        "advanced": "● ●"
    }
]