XML parsing

Catalog

One ： Analytic mind map ：

Two ： First you need to configure xml The format of the document

3、 ... and ： obtain java Three configuration locations and reading methods of configuration files in ：

1. In the case of the same package ：

2. In the case of root path ：

How to view the root path ：

3.WIN-INF Safe path ：

dom4j（jar Rack bag ） And use common methods to obtain xml Elements and attributes in the file

1. Shelf bag acquisition

2. Common methods

2.1.selectNodes（ Get multiple elements , Xiaobian is used to get the root element ）

2.2.selectSingleNode（ Get a single element ）

3. Source code ：

Dear bosses , Please praise it a little , Thank you for reading

---

One ： Analytic mind map ：

Two ： First you need to configure xml The format of the document

The code is as follows ：

<?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 label : Can contain 0~N individual action label  -->
<config>
	<!-- action label : Can be full of 0~N individual forward label  path: With / Starting string , And the value must be unique   Non empty  type: character string , Non empty  -->
	<action path="/regAction" type="test.RegAction">
		<!-- forward label : No sub tags ; name: character string , same action Label under forward label name The value can't be the same  ; path: With / Starting string  
			redirect: Can only be false|true, Allow space , The default value is false -->
		<forward name="failed" path="/reg.jsp" redirect="false" />
		<forward name="success" path="/login.jsp" redirect="true" />
	</action>

	<action path="/loginAction" type="test.LoginAction">
		<forward name="failed" path="/login.jsp" redirect="false" />
		<forward name="success" path="/main.jsp" redirect="true" />
	</action>
</config>

3、 ... and ： obtain java Three configuration locations and reading methods of configuration files in ：

1. In the case of the same package ：

Demo1.class.getResourceAsStream("config.xml");

2. In the case of root path ：

Demo1.class.getResourceAsStream("/config.xml");

How to view the root path ：

Right click on the item , Click the blue area in the figure below ：

  Enter the following interface , choice Source You can see that resources and src Under the same directory , Xiaobian will config The papers are in resource Under the table of contents , So you can use the root directory method to get files  

3.WIN-INF Safe path ：

context.getResourceAsStream("/WEB-INF/config");

dom4j（jar Rack bag ） And use common methods to obtain xml Elements and attributes in the file

1. Shelf bag acquisition

used jar package dom4j  

Rack package download

xml Analyze rack package    password :hlx8

2. Common methods

2.1.selectNodes（ Get multiple elements , Xiaobian is used to get the root element ）

// Get the root element 
		Element rootElement = doc.getRootElement();

2.2.selectSingleNode（ Get a single element ）

// Get a single element 
		Element rootElement = doc.selectSingleNode();

2.3.attributeValue（ Get the attributes in the element ）

String path = action.attributeValue("path");
			String type = action.attributeValue("type");

2.4.getText（ Get the value in the attribute ）

String path = action.getText();
	

3. Source code ：

package com.zking.mvc;

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 {
		// By way of flow , get files 
		InputStream in = XmlRead.class.getResourceAsStream("/config.xml");
		// Read xml file , And help us analyze 
		SAXReader reader = new SAXReader();
		// After reading, put it in doc in 
		Document doc = reader.read(in);
		// Get the root element 
		Element rootElement = doc.getRootElement();
		List<Element> actions = rootElement.selectNodes("/config/action");
		// Loop through to get action Properties under 
		for (Element action : actions) {
			String path = action.attributeValue("path");
			String type = action.attributeValue("type");
			
			List<Element> forwards = action.selectNodes("forward");
			// Loop through to get forward Properties under 
			for (Element forward : forwards) {
				String name = forward.attributeValue("name");
				String fpath = forward.attributeValue("path");
				String redirect = forward.attributeValue("redirect");
				System.out.println("name = " + name);
				System.out.println("fpath = " + fpath);
				System.out.println("redirect = " + redirect);
			}
			System.out.println("path = " + path);
			System.out.println("type = " + type);
			System.out.println("=================");
		}
	}
	
}

Dear bosses , Please praise it a little , Thank you for reading