使用Jdom2获取XML元素的行号

最新推荐文章于 2023-11-26 22:56:46 发布

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#XML操作

本文介绍了如何使用JDOM2的扩展类LineNumberElement和LineNumberSAXHandler来获取XML元素的行号。由于这些类不在Jdom2-2.0.5.jar中，你需要从特定的源码包下载。通过提供的Java代码示例，展示了如何解析XML文件并打印出元素的行号。

关键类：

org.jdom2.contrib.input.LineNumberElement

org.jdom2.contrib.input.LineNumberSAXHandler

注意：这两个类在Jdom2-2.0.5.jar中是不存在的，需要下载Jdom2-2.0.5的src包，

下载链接：http://www.java2s.com/Code/Jar/j/Downloadjdom2205sourcesjar.htm

示例Java代码：


import java.io.IOException;
import java.util.List;

import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.contrib.input.LineNumberElement;
import org.jdom2.contrib.input.LineNumberSAXHandler;
import org.jdom2.filter.Filter;
import org.jdom2.filter.Filters;
import org.jdom2.input.SAXBuilder;
import org.jdom2.xpath.XPathBuilder;
import org.jdom2.xpath.XPathExpression;
import org.jdom2.xpath.XPathFactory;
import org.jdom2.xpath.jaxen.JaxenXPathFactory;
/**
 * 查找mybatis的配置文件中的所有select元素的行号
 * 
 * @author kent.yang
 *
 */
public class FindElementLineOfXML{
	/**
	 * 查找mybatis的配置文件中的所有select元素的行号
	 * 
	 * @param filePath
	 * @return  
	 */
	public void createDom(String filePath) {
		SAXBuilder saxBuilder = new SAXBuilder();
		saxBuilder.setSAXHandlerFactory(LineNumberSAXHandler.SAXFACTORY);
		Document document = null;
		try {
			document = saxBuilder.build(filePath);
		} catch (JDOMException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		Element root = document.getRootElement();
		if (!"mapper".equals(root.getName())) {
			return;
		}
		XPathFactory factory = JaxenXPathFactory.instance();
		Filter<Element> filter = Filters.element();
		XPathBuilder<Element> builder = new XPathBuilder<Element>("//select", filter);
		XPathExpression<Element> objs = builder.compileWith(factory);
		List<Element> objList = objs.diagnose(root, false).getResult();
		for (Element elm : objList) {
            //解析完成以后其实已经是LineNumberElement，但XPath不支持，所以先用Xpath取Element，再强转
			LineNumberElement lineElm = (LineNumberElement) elm;
			System.out.println("元素：" + elm.getName() + "的行号：" + lineElm.getStartLine());
			
		}
	}

    public static void main(String[] args){
        FindElementLineOfXML fel = new FindElementLineOfXML();
        fel.createDom("D:/CityMapper.xml");
    }

}

XML文件：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="org.spring.springboot.dao.CityDao">
	<resultMap id="BaseResultMap" type="org.spring.springboot.domain.City">
		<result column="id" property="id" />
		<result column="province_id" property="provinceId" />
		<result column="city_name" property="cityName" />
		<result column="description" property="description" />
	</resultMap>

	<parameterMap id="City" type="org.spring.springboot.domain.City"/>

	<sql id="Base_Column_List">
		id, province_id, city_name, description
	</sql>

	<select id="findByName" resultMap="BaseResultMap" parameterType="java.lang.String">
		select
		<include refid="Base_Column_List" />
		from city
		where city_name = #{cityName}
	</select>

</mapper>

运行结果：

元素：select的行号：17