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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.core.XpathEvaluator;
import cn.wanghaomiao.xpath.exception.NoSuchAxisException;
import cn.wanghaomiao.xpath.exception.NoSuchFunctionException;
import cn.wanghaomiao.xpath.exception.XpathSyntaxErrorException;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.select.Elements;

import java.util.LinkedList;
import java.util.List;

/**
 * @author 汪浩淼 [ [email protected] ]
 */
public class JXDocument {
    private Elements elements;
    private XpathEvaluator xpathEva = new XpathEvaluator();
    public JXDocument(Document doc){
        elements = doc.children();
    }
    public JXDocument(String html){
        elements = Jsoup.parse(html).children();
    }
    public JXDocument(Elements els){
        elements = els;
    }
    
    public List sel(String xpath) throws XpathSyntaxErrorException {
        List res = new LinkedList();
        try {
             List jns = xpathEva.xpathParser(xpath,elements);
             for (JXNode j:jns){
                 if (j.isText()){
                     res.add(j.getTextVal());
                 }else {
                     res.add(j.getElement());
                 }
             }
        } catch (Exception e){
            String msg = "please check the xpath syntax";
            if (e instanceof NoSuchAxisException||e instanceof NoSuchFunctionException){
                msg = e.getMessage();
            }
            throw new XpathSyntaxErrorException(msg);
        }
        return res;
    }

    public List selN(String xpath) throws XpathSyntaxErrorException{
        try {
            return xpathEva.xpathParser(xpath,elements);
        }catch (Exception e){
            String msg = "please check the xpath syntax";
            if (e instanceof NoSuchAxisException||e instanceof NoSuchFunctionException){
                msg = e.getMessage();
            }
            throw new XpathSyntaxErrorException(msg);
        }
    }
}