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一个非常好用而且强大的基于xpath的html解析器。html的DOM树生成依赖Jsoup。Lexer 和 Parser基于Antlr4,支持完备的W3C XPATH 1.0标准语法，W3C规范：http://www.w3.org/TR/1999/REC-xpath-19991116。

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package cn.wanghaomiao.xpath.model;
/*
   Copyright 2014 Wang Haomiao

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */

import cn.wanghaomiao.xpath.exception.XpathSyntaxErrorException;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import java.util.List;

/**
 * XPath提取后的
 * @author 汪浩淼 [email protected]
 * @since 2016/5/12.
 */
public class JXNode {
    private Element element;
    private boolean isText;
    private String textVal;

    public Element getElement() {
        return element;
    }

    public JXNode setElement(Element element) {
        this.element = element;
        return this;
    }

    public boolean isText() {
        return isText;
    }

    public JXNode setText(boolean text) {
        isText = text;
        return this;
    }

    public String getTextVal() {
        return textVal;
    }

    public JXNode setTextVal(String textVal) {
        this.textVal = textVal;
        return this;
    }

    public List sel(String xpath) throws XpathSyntaxErrorException {
        if (element ==null){
            return null;
        }
        JXDocument doc = new JXDocument(new Elements(element));
        return doc.selN(xpath);
    }

    public static JXNode e(Element element){
        JXNode n = new JXNode();
        n.setElement(element).setText(false);
        return n;
    }

    public static JXNode t(String txt){
        JXNode n = new JXNode();
        n.setTextVal(txt).setText(true);
        return n;
    }

    @Override
    public String toString() {
        if (isText){
            return textVal;
        }else {
            return element.toString();
        }
    }
}