解析需要知道的部分知识

获得不同存放路径下XML文件的方法

类名.class.getResourceAsStream(“xxx”)：拿到同包下的文件

类名.class.getResourceAsStream(“/xxx”)：拿到根目录下的文件

context.getResourceAsStream(“/WIN-INF/xxx”)：拿到WIN-INF安全路径

dom4j常用方法

selectNodes：拿到多个元素

selectSingleNode：拿到单个元素

getRootElement()：拿到根元素

attributeValue：只有元素才可以点出这个方法来获取值

getText：拿到元素文本

xpath语法

/：定位路径

@：属性

案例

创建xml文件config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE config[
	<!ELEMENT config (action*)>
	<!ELEMENT action (forward*)>
	<!ELEMENT forward EMPTY>
	<!ATTLIST action
	  path CDATA #REQUIRED
	  type CDATA #REQUIRED
	>
	<!ATTLIST forward
	  name CDATA #REQUIRED
	  path CDATA #REQUIRED
	  redirect (true|false) "false"
	>
]>
<config>
	<action path="/studentAction" type="org.lisen.mvc.action.StudentAction">
		<forward name="students" path="/students/studentList.jsp" redirect="false"/>
	</action>
	<action path="/studentAction02" type="org.lisen.mvc.action.StudentAction">
		<forward name="students02" path="/students/studentList.jsp" redirect="false"/>
	</action>
</config>
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导入需要使用的jar包

编写执行代码

package com.demo;

import java.io.InputStream;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class xmlRead {

	public static void main(String[] args) throws Exception {
		InputStream in = xmlRead.class.getResourceAsStream("/config.xml");
		SAXReader reader = new SAXReader();
		Document doc = reader.read(in);
		
		Element rootElement = doc.getRootElement();
		List<Element> action = rootElement.selectNodes("action");
		
		for (Element e : action) {
			String path = e.attributeValue("path");
			String type = e.attributeValue("type");
			
			System.out.println("action path="+path);
			System.out.println("action type="+type);
			
			List<Element> forward = e.selectNodes("forward");
			for (Element fe : forward) {
				String fpath = fe.attributeValue("path");
				String name = fe.attributeValue("name");
				String redirect = fe.attributeValue("redirect");
				
				System.out.println("forward path="+fpath);
				System.out.println("forward name="+name);
				System.out.println("forward redirect="+redirect);
			}
			System.out.println("==========================");
		}
		System.out.println("已完成解析");
	}
	
}

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输出结果：