创建自己的html方法以提取标记

Question

我无法使用HTML库中的任何内容的规则需要从头开始制作方法。

给定一个包含<name> brain </name> <job> evil scientist </job>等文本的文本文件，我需要在html <>之间提取信息并获取标记。我的方法不断返回数组超出范围的异常，我不确定如何修复方法。

public static String extractTagContent(String html, String tag) {
    String list = "";
    while (html.contains("</" + tag + ">")) {
        list += html.substring(html.indexOf("<" + tag + ">") + tag.length() + 1, html.indexOf("</" + tag + ">")) + "\n";

        html = html.substring(html.indexOf("<" + tag + ">") + tag.length() + 3);
    }
    return list;
}

Answer 1

在循环中修复了这两行

list += html.substring(html.indexOf("<" + tag + ">") + tag.length() + 2, html.indexOf("</" + tag + ">")) + "\n";
html = html.substring(0, html.indexOf("<" + tag + ">")) + html.substring(html.indexOf("</" + tag + ">") + tag.length() + 3, html.length());

整个代码

public static String extractTagContent(String html, String tag) {
    String list = "";
    while (html.contains("</" + tag + ">")) {
        list += html.substring(html.indexOf("<" + tag + ">") + tag.length() + 2, html.indexOf("</" + tag + ">")) + "\n";
        html = html.substring(0, html.indexOf("<" + tag + ">")) + html.substring(html.indexOf("</" + tag + ">") + tag.length() + 3, html.length());
    }
    return list;
}