去除字符串中的HTML标签

背景：Kindeditor内容保存在数据库中的类型是text,包含文字和HTML标签。

需求：显示内容的前50个字（纯文字内容）

方法：将字段查出去除标签，截取前50

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

public class StrUtils {

    private static final String regEx_script = "<script[^>]*?>[\s\S]*?<\/script>"; // 定义script的正则表达式
    private static final String regEx_style = "<style[^>]*?>[\s\S]*?<\/style>"; // 定义style的正则表达式
    private static final String regEx_html = "<[^>]+>"; // 定义HTML标签的正则表达式
    private static final String regEx_img = "<img\s*([^>]*)\s*src=\"(.*?)\"\s*([^>]*)>";// 定义image标签的正则表达式
    private static final String regEx_emoji = "[\ud83c\udc00-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\ud83e\udd00-\ud83e\udfff]|[\u2600-\u27ff]";// 定义表情标签的正则表达式
    private static final String regEx_space = "\s*|	|
|
";//定义空格回车换行符
    private static final String regEx_special = "\&[a-zA-Z]{1,10};";//定义特殊字符


    public static String delHTMLTag(String htmlStr) {

        // 过滤script标签
        Pattern p_script = Pattern.compile(regEx_script, Pattern.CASE_INSENSITIVE);
        Matcher m_script = p_script.matcher(htmlStr);
        htmlStr = m_script.replaceAll("");

        // 过滤style标签
        Pattern p_style = Pattern.compile(regEx_style, Pattern.CASE_INSENSITIVE);
        Matcher m_style = p_style.matcher(htmlStr);
        htmlStr = m_style.replaceAll("");

        // 过滤image标签
        Pattern p_img = Pattern.compile(regEx_img, Pattern.CASE_INSENSITIVE);
        Matcher m_img = p_img.matcher(htmlStr);
        htmlStr = m_img.replaceAll("");

        // 过滤emoji标签
        Pattern p_emoji = Pattern.compile(regEx_emoji, Pattern.CASE_INSENSITIVE);
        Matcher m_emoji = p_emoji.matcher(htmlStr);
        htmlStr = m_emoji.replaceAll("");

        // 过滤html标签
        Pattern p_html = Pattern.compile(regEx_html, Pattern.CASE_INSENSITIVE);
        Matcher m_html = p_html.matcher(htmlStr);
        htmlStr = m_html.replaceAll("");

        // 过滤空格回车标签
        Pattern p_space = Pattern.compile(regEx_space, Pattern.CASE_INSENSITIVE);
        Matcher m_space = p_space.matcher(htmlStr);
        htmlStr = m_space.replaceAll("");

        // 过滤特殊字符
        Pattern p_special = Pattern.compile(regEx_special, Pattern.CASE_INSENSITIVE);
        Matcher m_special = p_special.matcher(htmlStr);
        htmlStr = m_special.replaceAll("");

        return htmlStr.trim(); // 返回文本字符串
    }

    public static String getTextFromHtml(String htmlStr){
        htmlStr = delHTMLTag(htmlStr);
        htmlStr = htmlStr.replaceAll(" ", "");
        if (htmlStr.length()>50){
            htmlStr = htmlStr.substring(0,50);
        }
        return htmlStr;
    }

}