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<?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>

A tag is an object , On the top xml There are three labels in the file config、action、forward. So we need three entity classes to model

ConfigModel class

Add ActionModel object , adopt path Find the corresponding ActionModel object

package com.zking.mymvc.framework;

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

public class ConfigModel {

	private Map<String, ActionModel> actionMap=new HashMap<String, ActionModel>();
	

	/**
	 *  take ActionModel Objects in the map aggregate 
	 * @param forward
	 */
	public void put(ActionModel action) {
		if(actionMap.containsKey(action.getPath())) {
			throw new ActionDuplicateDefinitionException("Action path ="+ action.getPath()+" duplicate definition");
		}
		actionMap.put(action.getPath(), action);
	}
	
	/**
	 *  adopt action Medium path from map Take out the corresponding action object   if path If it is filled in incorrectly, a custom exception will be thrown and not found 
	 * @param name
	 * @return
	 */
	public ActionModel find(String path) {
		if(!actionMap.containsKey(path)) {
		throw new ActionNotFoundException("Action path ="+ path +" not found");
	}
		return actionMap.get(path);
	}

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

ActionModel class

Add ForwardModel object , adopt path Find the corresponding ForwardModel object

package com.zking.mymvc.framework;

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

public class ActionModel {

	private String path;
	private String type;
	private Map<String, ForwardModel> forwardMap=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;
	}
	public Map<String, ForwardModel> getForwardMap() {
		return forwardMap;
	}
	public void setForwardMap(Map<String, ForwardModel> forwardMap) {
		this.forwardMap = forwardMap;
	}
	
	/**
	 *  take forwardModel Objects in the map aggregate 
	 * @param forward
	 */
	public void put(ForwardModel forward) {
		if(forwardMap.containsKey(forward.getName())) {
			throw new ForwardDuplicateDefinitionException("forward name= "+forward.getName()+"duplicate definition");
			
		}
		forwardMap.put(forward.getName(), forward);
	}
	
	/**
	 *  adopt forward Medium name from map Take out the corresponding forward object   if name If it is filled in incorrectly, a custom exception will be thrown and not found 
	 * @param name
	 * @return
	 */
	public ForwardModel find(String name) {
		if(!forwardMap.containsKey(name)) {
			throw new ForwardNotFoundException("Forward name ="+name+" not found");
		}
		return forwardMap.get(name);
	}
	@Override
	public String toString() {
		return "ActionModel [path=" + path + ", type=" + type + ", forwardMap=" + forwardMap + "]";
	}
	
	
}

Custom exception

action Repeat the definition

package com.zking.mymvc.framework;

public class ActionDuplicateDefinitionException extends RuntimeException{

	public ActionDuplicateDefinitionException() {
		super();
	}
	/**
	 *  Error message 
	 * @param msg
	 */
	public ActionDuplicateDefinitionException(String msg) {
		super(msg);
	}
	/**
	 *  Error message 、 Error reason 
	 * @param msg
	 * @param c
	 */
	public ActionDuplicateDefinitionException(String msg,Throwable c) {
		super(msg,c);
	}
	
}

action Of path Can't find

package com.zking.mymvc.framework;

public class ActionNotFoundException extends RuntimeException {

	public ActionNotFoundException() {
		super();
	}
	/**
	 *  Error message 
	 * @param msg
	 */
	public ActionNotFoundException(String msg) {
		super(msg);
	}
	/**
	 *  Error message 、 Error reason 
	 * @param msg
	 * @param c
	 */
	public ActionNotFoundException(String msg,Throwable c) {
		super(msg,c);
	}
	
}

ForwardModel class

package com.zking.mymvc.framework;

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;
	}
	
	public void setRedirect(String redirect) {
		this.redirect = Boolean.valueOf(redirect);
	}
	@Override
	public String toString() {
		return "ForwardModel [name=" + name + ", path=" + path + ", redirect=" + redirect + "]";
	}
	
	
	
}

Custom exception

forward Repeat the definition

package com.zking.mymvc.framework;

public class ForwardDuplicateDefinitionException extends RuntimeException{

	public ForwardDuplicateDefinitionException() {
		super();
	}
	/**
	 *  Error message 
	 * @param msg
	 * 
	 */
	public ForwardDuplicateDefinitionException(String msg) {
		super(msg);
	}
	/**
	 *  Error message 、 Error reason 
	 * @param msg
	 * @param c
	 */
	public ForwardDuplicateDefinitionException(String msg,Throwable c) {
		super(msg,c);
	}
	
}

forward Medium name Can't find

package com.zking.mymvc.framework;

public class ForwardNotFoundException extends RuntimeException {

	public ForwardNotFoundException() {
		super();
	}
	/**
	 *  Error message 
	 * @param msg
	 */
	public ForwardNotFoundException(String msg) {
		super(msg);
	}
	/**
	 *  Error message 、 Error reason 
	 * @param msg
	 * @param c
	 */
	public ForwardNotFoundException(String msg,Throwable c) {
		super(msg,c);
	}
	
}

When all three are finished , Put them in ConfigModel In the middle , Need to build a ConfigFactory class

ConfigFactory class

package com.zking.mymvc.framework;

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


import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.xml.sax.XMLReader;

@SuppressWarnings("unchecked")
public final class ConfigModelFactory {

	private ConfigModelFactory() {
		
	}
	
	private static ConfigModel config=new ConfigModel();
	
	// To read config.xml The data in is filled into the model 
	static {
		try {
			//1. obtain io flow 
			InputStream in = XMLReader.class.getResourceAsStream("/config.xml");
		    //2. establish xml Read tool class SAXReader
			SAXReader sax = new SAXReader();
		    //3. Read configuration file , get Document object 
			Document doc = sax.read(in);
		    // Get the root element 
		    Element rootElement = doc.getRootElement();
		    // find action node 
		    List<Element> actions = rootElement.selectNodes("action");
	        for(Element e: actions) {
	        	// Get attribute value 
	        	String path = e.attributeValue("path");
	            String type = e.attributeValue("type");
	            // Instantiation ActionModel object 
	            ActionModel action = new ActionModel();
	           // Put the attribute value in ActionModel in 
	            action.setPath(path);
	            action.setType(type);
	            // find forward node 
	            List<Element> forwards = e.selectNodes("forward");
	           for(Element f: forwards) {
	        	 // Get attribute value 
	        	   String name = f.attributeValue("name");
	               String fpath = f.attributeValue("path");
	               String redirect = f.attributeValue("redirect");
	               // Instantiation ForwardModel object 
	                ForwardModel forward = new ForwardModel();
	               // Put the attribute value in ForwardModel Go to the object 
	                forward.setName(name);
	               forward.setPath(fpath);
	               forward.setRedirect(redirect);
	               // take ForwardModel Put it in ActionModel Go to the assembly 
	              action.put(forward);   
	           }
	         // take ActionModel Put it in the assembly ConfigModel
	           config.put(action);
	        }
		} catch (Exception e) {
			e.printStackTrace();
		}
        
	}
	
	public static ConfigModel getConfig() {
		return config;
	}
	
	
}

test

package com.zking.mymvc.framework;

public class Test {
public static void main(String[] args) {
		ConfigModel config=ConfigModelFactory.getConfig();
	  ActionModel action = config.find("/studentAction");
	  System.out.println(action);
	  ForwardModel forward = action.find("students");
	  System.out.println(forward);
	}

}

test result ：

If we deliberately action The path in is misspelled

package com.zking.mymvc.framework;

public class Test {
public static void main(String[] args) {
		ConfigModel config=ConfigModelFactory.getConfig();
	  ActionModel action = config.find("/studentction");
	  System.out.println(action);
	  ForwardModel forward = action.find("students");
	  System.out.println(forward);
	}

}

The renderings are as follows ： The custom exception will be displayed. The path cannot be found