XML建模

建模分两步：
1、以面向对象的编程思想，描述xml资源文件。

2、将xml文件中内容封装进model实体对象。

 

导入文件：config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE config[<!ELEMENT config (action*)><!ELEMENT action (forward*)><!ELEMENT forward EMPTY><!ATTLIST actionpath CDATA #REQUIREDtype CDATA #REQUIRED><!ATTLIST forwardname CDATA #REQUIREDpath CDATA #REQUIREDredirect (true|false) "false">
]>
<!-- config标签:可以包含0~N个action标签 -->
<config><!-- action标签:可以饱含0~N个forward标签 path:以/开头的字符串,并且值必须唯一 非空 type:字符串,非空 --><action path="/regAction" type="test.RegAction"><!-- forward标签:没有子标签; name:字符串,同一action标签下的forward标签name值不能相同 ; path:以/开头的字符串 redirect:只能是false|true,允许空,默认值为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>

 

新建类：ConfigModel.java

package com.zking.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);}}

　　

新建类：Actionmodel.java

package com.zking.model;import java.util.HashMap;
import java.util.Map;public class Actionmodel {//	<action path="/loginAction" type="test.LoginAction">private String path	;private String type;private Map<String, ForwardModel> fmap=new HashMap<>();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 void push(ForwardModel forwardModel) {fmap.put(forwardModel.getName(), forwardModel);}public ForwardModel pop(String name) {return fmap.get(name);}}

　　

新建类：ForwardModel.java

package com.zking.model;public class ForwardModel {
//	<forward name="failed" path="/login.jsp" redirect="false" />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;}}

　　

新建类：ConfigModelFactory.java

package com.zking.model;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;/** 23设计模式之一* 工厂模式*  设计模式是一种解决方案，就是为了处理java中所遇到的特定的一些问题*  	解决什么问题呢？*  它是用来将资源文件生产指定的实体类*  好处：*  提高了代码的复用性*/
public class ConfigModelFactory {public static ConfigModel build() throws DocumentException {return ConfigModel("/config.xml");}/** 生产出有类内容的实体类configmodel*/private static ConfigModel ConfigModel(String string) throws DocumentException {ConfigModel configModel=new ConfigModel();Actionmodel actionmodel=null;ForwardModel forwardModel=null;	InputStream in=	ConfigModelFactory.class.getResourceAsStream(string);SAXReader reader=new SAXReader();Document document=reader.read(in);List<Element> list= document.selectNodes("/config/action");for (Element element : list) {actionmodel=new Actionmodel();//给actionmodel对象填充xml中的action标签的内容actionmodel.setPath(element.attributeValue("path"));actionmodel.setType(element.attributeValue("type"));List<Element> list2= element.selectNodes("forward");for (Element element2 : list2) {forwardModel =new ForwardModel();	//给forwardmodel对象填充xml中的action标签的内容forwardModel.setName(element2.attributeValue("name"));forwardModel.setPath(element2.attributeValue("path"));forwardModel.setRedirect(!"false".equals(element2.attributeValue("redirect")));//<forward name="failed" path="/reg.jsp" redirect="false" />//resirect默认是true//只有填了false才是转发//element2.attributeValue("redirect")拿到的是xml中你所填的值//不填       重定向    	"false".equals(element2.attributeValue("redirect"))是false
//				填   true  定向		"false".equals(element2.attributeValue("redirect"))是false//填false  转发	false".equals(element2.attributeValue("redirect"))是true//				actionmodel.push(forwardModel);}configModel.push(actionmodel);}return configModel;}public static void main(String[] args) throws DocumentException {ConfigModel  configModel=ConfigModelFactory.build();Actionmodel actionmodel=configModel.pop("/loginAction");
//		System.out.println(actionmodel.getType());ForwardModel forwardModel=actionmodel.pop("success");System.out.println(actionmodel.getType());System.out.println(forwardModel.getPath());}}

　　

注释：

本项目一共导用了两个jar包：dom4j-1.6.1.jar     jaxen-1.1-beta-6.jar