Modeling of XML

One 、xml modeling

Modeling is divided into two steps ：
1、 With the idea of object-oriented programming , describe xml Resource file
2、 take xml The contents of the document are encapsulated in model Entity object .

characteristic ： Just call the specified method to complete the predetermined string acquisition ;
The idea of modeling ：
1、 analysis xml Properties and behaviors in the content contained in , And then encapsulate it ;
2、 When encapsulating, it is necessary to judge whether the attribute is single or multiple , And then sort it out ;
3、 When packaging, pay attention to from the inside to the outside （ From small to large ） encapsulate ;
4、xml Put the file in the root directory , Otherwise, a null pointer exception will occur
Case study

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
  <servlet>
  	<servlet-name>jrebelServlet</servlet-name>
  	<servlet-class>com.zsm.xml.JrebelServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>jrebelServlet</servlet-name>
  	<url-pattern>/jrebelServlet</url-pattern>
  </servlet-mapping>
  
  <servlet>
  	<servlet-name>jrebelServlet2</servlet-name>
  	<servlet-class>com.zsm.xml.JrebelServlet2</servlet-class>
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>jrebelServlet2</servlet-name>
  	<url-pattern>/jrebelServlet2</url-pattern>
  	<url-pattern>/jrebelServlet3</url-pattern>
  </servlet-mapping>
</web-app>

ForwardModel.java

package com.zsm.model;

public class ForwardModel {
	private String name;
	private String path;
	private boolean redirect;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPath() {
		return path;
	}
	public void setPath(String path) {
		this.path = path;
	}
	public boolean isRedirect() {
		return redirect;
	}
	public void setRedirect(boolean redirect) {
		this.redirect = redirect;
	}

}

ActionModel.java

package com.zsm.model;

import java.util.HashMap;
import java.util.Map;

public class ActionModel {
	private String path;
	private String type;
	private  Map<String,ForwardModel> fMap=new HashMap<String,ForwardModel>();
	public String getPath() {
		return path;
	}
	public void setPath(String path) {
		this.path = path;
	}
	public String getType() {
		return type;
	}
	public void setType(String type) {
		this.type = type;
	}
	// Two behaviors , increase forwardModel object , lookup forwardModel object 
	// Will a new forward  Label objects are added to the container 
	public void push(ForwardModel forwoardModel) {
		fMap.put(forwoardModel.getName(), forwoardModel);
	}
	public ForwardModel pop(String name) {
		return fMap.get(name);
	}
}

ConfigModel.java

package com.zsm.model;

import java.util.HashMap;
import java.util.Map;

public class ConfigModel {
	private Map<String, ActionModel> aMap=new HashMap<>();
	public void push(ActionModel actionModel) {
		aMap.put(actionModel.getPath(),actionModel);
	}
	
	public ActionModel pop(String path) {
		return aMap.get(path);
	}
	
}

Two 、 Factory mode

1. Why use factory mode
It can improve the reusability of code
2. How to use factory mode
Just build a method , To produce the specified object you need
3. Where to use factory mode
To produce the specified object you need , For reuse , Repeat the operation xml file , Repeatedly analyze xml character string
Case study ：

package com.zsm.model;

import java.io.InputStream;
import java.util.List;
import com.cxy.model.ForwardModel;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class ConfigModelFactory {
	public static  ConfigModel build(String path) throws Exception {
		//String defaultPath="/config.xml";
		InputStream in = ConfigModelFactory.class.getResourceAsStream(path);
		SAXReader sr=new SAXReader();
		Document doc = sr.read(in);
		List<Element> actionEles = doc.selectNodes("/config/action");
		ConfigModel configModel=new ConfigModel();
		for (Element actionEle : actionEles) {
			ActionModel actionModel=new ActionModel();
			actionModel.setPath(actionEle.attributeValue("path"));
			actionModel.setType(actionEle.attributeValue("type"));
//		 take forwardModel Assign and add to ActionModel in 
			List<Element> forwardEles = actionEle.selectNodes("forward");
			for (Element element : forwardEles) {
				ForwardModel forwardModel = new ForwardModel();
				forwardModel.setName(element.attributeValue("name"));
				forwardModel.setPath(element.attributeValue("path"));
//				redirect: Can only be false|true, Allow space , The default value is false
				forwardModel.setRedirect("true".equals(element.attributeValue("redirect")));
				actionModel.push(forwardModel);
			}
			configModel.push(actionModel);
		}
		return configModel;
	}
	
	public static  ConfigModel build() throws Exception {
		String defaultPath="/config.xml";
		return build(defaultPath);
	}

	public static void main(String[] args) throws Exception {
		//ConfigModel configModel=new ConfigModel();
		ConfigModel configModel=ConfigModelFactory.build();
		ActionModel actionModel = configModel.pop("/loginAction");
		System.out.println(actionModel.getType());
		ForwardModel forwardModel = actionModel.pop("success");
		System.out.println(forwardModel.getPath());
	
	}

}

3、 ... and 、 Case study ：web.xml

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
  <servlet>
  	<servlet-name>jrebelServlet</servlet-name>
  	<servlet-class>com.zsm.xml.JrebelServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>jrebelServlet</servlet-name>
  	<url-pattern>/jrebelServlet</url-pattern>
  </servlet-mapping>
  
  <servlet>
  	<servlet-name>jrebelServlet2</servlet-name>
  	<servlet-class>com.zsm.xml.JrebelServlet2</servlet-class>
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>jrebelServlet2</servlet-name>
  	<url-pattern>/jrebelServlet2</url-pattern>
  	<url-pattern>/jrebelServlet3</url-pattern>
  </servlet-mapping>
</web-app>

ServletClassModel .java

package com.zsm.modelzsm;

/**
 * servlet Entity class 
 * @author zjjt
 *
 */
public class ServletClassModel {
	private String context;

	public String getContext() {
		return context;
	}

	public void setContext(String context) {
		this.context = context;
	}
	
	public ServletClassModel() {
		// TODO Auto-generated constructor stub
	}

	public ServletClassModel(String context) {
		super();
		this.context = context;
	}

	@Override
	public String toString() {
		return "ServletClassModel [context=" + context + "]";
	}
	
}

ServletNameModel .java

package com.zsm.modelzsm;

/**
 * servletname Entity class 
 * @author zjjt
 *
 */
public class ServletNameModel {

	private String content;

	public String getContent() {
		return content;
	}

	public void setContent(String content) {
		this.content = content;
	}
	
	public ServletNameModel() {
		// TODO Auto-generated constructor stub
	}

	public ServletNameModel(String content) {
		super();
		this.content = content;
	}

	@Override
	public String toString() {
		return "ServletNameModel [content=" + content + "]";
	}



}

UrlPatternModel.java

package com.zsm.modelzsm;

/**
 * url—pattern Entity class 
 * @author zjjt
 *
 */
public class UrlPatternModel {
	private String context;

	public String getContext() {
		return context;
	}

	public void setContext(String context) {
		this.context = context;
	}
	
	public UrlPatternModel() {
		// TODO Auto-generated constructor stub
	}

	public UrlPatternModel(String context) {
		super();
		this.context = context;
	}

	@Override
	public String toString() {
		return "UrlPatternModel [context=" + context + "]";
	}	
}

ServletModel .java

package com.zsm.modelzsm;

/**
 * servlet Entity class 
 * @author zjjt
 *
 */
public class ServletModel {
	private ServletNameModel servletname;
	private ServletClassModel servletclass;
	
	public ServletNameModel getServletname() {
		return servletname;
	}
	public void setServletname(ServletNameModel servletname) {
		this.servletname = servletname;
	}
	public ServletClassModel getServletclass() {
		return servletclass;
	}
	public void setServletclass(ServletClassModel servletclass) {
		this.servletclass = servletclass;
	}
	
	public ServletModel() {
		// TODO Auto-generated constructor stub
	}
	public ServletModel(ServletNameModel servletname, ServletClassModel servletclass) {
		super();
		this.servletname = servletname;
		this.servletclass = servletclass;
	}
	@Override
	public String toString() {
		return "ServletModel [servletname=" + servletname + ", servletclass=" + servletclass + "]";
	}
}

ServletMapingModel .java

package com.zsm.modelzsm;

import java.util.ArrayList;
import java.util.List;

/**
 * servletmapping Entity class 
 * @author zjjt
 *
 */
public class ServletMapingModel {
	private ServletNameModel servletNameModel;
	private List<UrlPatternModel> urlPatternModels = new ArrayList<>();
	
	public ServletNameModel getServletNameModel() {
		return servletNameModel;
	}
	public void setServletNameModel(ServletNameModel servletNameModel) {
		this.servletNameModel = servletNameModel;
	}
	
	public void pushUrlPatternModel(UrlPatternModel urlPatternModel) {
		urlPatternModels.add(urlPatternModel);
	}
	
	public List<UrlPatternModel> getUrlPatternModels() {
		return urlPatternModels;
	}
}

WepAppModel .java

package com.zsm.modelzsm;

import java.util.ArrayList;
import java.util.List;

/**wep-app Entity class 
 * @author zjjt
 *
 */
public class WepAppModel {
	private List<ServletModel> servletModels = new ArrayList<>();
	private List<ServletMapingModel> servletMappingModels = new ArrayList<>();

	public void push(ServletModel servletModel) {
		servletModels.add(servletModel);
	}
	
	public List<ServletModel> getServletModels() {
		return servletModels;
	}
	
	public void push(ServletMapingModel servletMappingModel) {
		servletMappingModels.add(servletMappingModel);
	}
	
	public List<ServletMapingModel> getServletMappingModels() {
		return servletMappingModels;
	}
	
}

WebAppModelFactory .java

package com.zsm.modelzsm;

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

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


public class WebAppModelFactory {
	/**
	 * xml
	 * @return
	 */
	public static WepAppModel buildWebAppModel() {
		String xmlPath = "/web.xml";
		return buildWebAppModel(xmlPath);
	}
	/**
	 *  modeling 
	 * @param path xml name 
	 * @return
	 */
	public static WepAppModel buildWebAppModel(String path) {
		InputStream in = WebAppModelFactory.class.getResourceAsStream(path);
		SAXReader sr = new SAXReader();
		WepAppModel wam = new WepAppModel();
		try {
			Document doc = sr.read(in);
			/*
			 *  take servlet The contents of the label are filled in web-app
			 */
			List<Element> servletEles = doc.selectNodes("/web-app/servlet");
			for (Element servletEle : servletEles) {
				ServletModel servletModel = new ServletModel();

				/*
				 *  to servlet  fill xml The content of 
				 */
				Element servletNameEle = (Element) servletEle.selectSingleNode("servlet-name");
				Element servletClassEle = (Element) servletEle.selectSingleNode("servlet-class");
				ServletNameModel servletNameModel = new ServletNameModel();
				ServletClassModel servletClassModel = new ServletClassModel();
				servletNameModel.setContent(servletNameEle.getText());
				servletClassModel.setContext(servletClassEle.getText());
				
				servletModel.setServletname(servletNameModel);
				servletModel.setServletclass(servletClassModel);

				wam.push(servletModel);
			}

			/*
			 *  take servlet-mapping The contents of the label are filled in web_app
			 */
			List<Element> servletMappingEles = doc.selectNodes("/web-app/servlet-mapping");
			for (Element servletMappingEle : servletMappingEles) {
				ServletMapingModel servletMappingModel = new ServletMapingModel();

				/*
				 *  to servletmapingmodel fill xml The content of 
				 */
				Element servletNameEle = (Element) servletMappingEle.selectSingleNode("servlet-name");
				ServletNameModel servletNameModel = new ServletNameModel();
				servletNameModel.setContent(servletNameEle.getText());
				servletMappingModel.setServletNameModel(servletNameModel);
				
				List<Element> urlPatternEles = servletMappingEle.selectNodes("url-pattern");
				for (Element urlPatternEle : urlPatternEles) {
					UrlPatternModel urlPatternModel = new UrlPatternModel();
					urlPatternModel.setContext(urlPatternEle.getText());
					servletMappingModel.pushUrlPatternModel(urlPatternModel);
				}

				wam.push(servletMappingModel);
			}

		} catch (Exception e) {
			e.printStackTrace();
		}
		return wam;
	}

	/**
	 *  Automatically find the corresponding background processing class through the web address entered by the browser 
	 * @param webAppModel	 The modeled entity class 
	 * @param url	 The web address visited by the browser 
	 * @return
	 */
	public static String getServletClassByUrl(WepAppModel webAppModel, String url) {
		String servletClass = "";
		/*
		 *  Find the corresponding URL of the browser servlet-name
		 */
		String servletName = "";
		List<ServletMapingModel> servletMapingModels = webAppModel.getServletMappingModels();
		for (ServletMapingModel servletMappingModel : servletMapingModels) {
			List<UrlPatternModel> urlPatternModels = servletMappingModel.getUrlPatternModels();
			for (UrlPatternModel urlPatternModel : urlPatternModels) {
				if(url.equals(urlPatternModel.getContext())) {
					ServletNameModel servletNameModel = servletMappingModel.getServletNameModel();
					servletName = servletNameModel.getContent();
				}
			}
		}
		
		/*
		 *  find servlet-name Corresponding background processing class 
		 */
		List<ServletModel> servletModels = webAppModel.getServletModels();
		for (ServletModel servletModel : servletModels) {
			ServletNameModel servletNameModel = servletModel.getServletname();
			if(servletName.equals(servletNameModel.getContent())) {
				ServletClassModel servletClassModel = servletModel.getServletclass();
				servletClass = servletClassModel.getContext();
			}
		}
		return servletClass;
	}
	
	public static void main(String[] args) {
		WepAppModel webAppModel = WebAppModelFactory.buildWebAppModel();
		String res = getServletClassByUrl(webAppModel, "/jrebelServlet");
		String res2 = getServletClassByUrl(webAppModel, "/jrebelServlet2");
		String res3 = getServletClassByUrl(webAppModel, "/jrebelServlet3");
		System.out.println(res);
		System.out.println(res2);
		System.out.println(res3);
		
	}
	
}