Get familiar with XML parsing quickly

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One ,Java Three configuration locations and reading methods of configuration files in

Two ,dome4j Common methods  

3、 ... and 、xpath grammar  

Four , Case study

  Output results ：

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One ,Java Three configuration locations and reading methods of configuration files in

Class name .class.getResourceAsStream("xxx")： Get the documents under the same package

Class name .class.getResourceAsStream("/xxx")： Get the file under the root directory

context.getResourceAsStream("/WIN-INF/xxx")： Get WIN-INF Safe path

Two ,dome4j Common methods  

selectNodes： Get multiple elements

selectSingleNode： Get a single element

getRootElement()： Get the root element

attributeValue： Only elements can click this method to get values

getText： Get the element text

notes ： Elements can be nodes , But the attribute in the element is a node, not an element

3、 ... and 、xpath grammar  

/： Positioning path

@： attribute

Four , Case study

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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>
</config>

 xmlRead.java

package com.zking.xml01;

import java.io.InputStream;
import java.util.Iterator;
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 root=doc.getRootElement();
		List<Element> action =root.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> forwards = e.selectNodes("forward");
			for(Element f: forwards) {
				String name = f.attributeValue("name");
				String fPath = f.attributeValue("path");
				String redirect = f.attributeValue("redirect");
				
				System.out.println("forward name="+name);
				System.out.println("forward fPath="+fPath);
				System.out.println("forward redirect="+redirect);
				
				
			}
			
		}
	}
}

  Output results ：

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From this we can see that we have got xml All attributes and elements in the file  

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