package com.sishuok.es.common.utils.html;
import com.sishuok.es.common.utils.html.jsoup.SishuokCleaner;
import com.sishuok.es.common.utils.html.jsoup.SishuokWhitelist;
import org.apache.commons.lang3.StringUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
/**
* html工具类
* 主要作用：标签转义、提取摘要、删除不安全的tag（比如<script></script>）
*/
public class HtmlUtils {
/**
* 获取html文档中的文本
*
* @return
*/
public static String text(String html) {
if (StringUtils.isEmpty(html)) {
return html;
}
return Jsoup.parse(removeUnSafeTag(html).replace("<", "<").replace(">", ">")).text();
}
/**
* 获取html文档中的文本 并仅提取文本中的前maxLength个 超出部分使用……补充
*
* @param html
* @param maxLength
* @return
*/
public static String text(String html, int maxLength) {
String text = text(html);
if (text.length() <= maxLength) {
return text;
}
return text.substring(0, maxLength) + "……";
}
/**
* 从html中移除不安全tag
*
* @param html
* @return
*/
public static String removeUnSafeTag(String html) {
SishuokWhitelist whitelist = new SishuokWhitelist();
whitelist.addTags("embed", "object", "param", "span", "div", "img", "font", "del");
whitelist.addTags("a", "b", "blockquote", "br", "caption", "cite", "code", "col", "colgroup");
whitelist.addTags("dd", "dl", "dt", "em", "hr", "h1", "h2", "h3", "h4", "h5", "h6", "i", "img");
whitelist.addTags("li", "ol", "p", "pre", "q", "small", "strike", "strong", "sub", "sup", "table");
whitelist.addTags("tbody", "td", "tfoot", "th", "thead", "tr", "u", "ul");
//删除以on开头的（事件）
whitelist.addAttributes(":all", "on");
Document dirty = Jsoup.parseBodyFragment(html, "");
SishuokCleaner cleaner = new SishuokCleaner(whitelist);
Document clean = cleaner.clean(dirty);
return clean.body().html();
}
/**
* 删除指定标签
*
* @param html
* @param tagName
* @return
*/
public static String removeTag(String html, String tagName) {
Element bodyElement = Jsoup.parse(html).body();
bodyElement.getElementsByTag(tagName).remove();
return bodyElement.html();
}
}