XML建模

建模分兩步：
1、以面向對象的編程思想，描述xml資源文件。

2、將xml文件中內容封裝進model實體對象。

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導入文件：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標簽:可以包含0~N個action標簽 -->
<config><!-- action標簽:可以飽含0~N個forward標簽 path:以/開頭的字符串,并且值必須唯一 非空 type:字符串,非空 --><action path="/regAction" type="test.RegAction"><!-- forward標簽:沒有子標簽; name:字符串,同一action標簽下的forward標簽name值不能相同 ; path:以/開頭的字符串 redirect:只能是false|true,允許空,默認值為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>

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新建類：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);}}

　　

新建類：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);}}

　　

新建類：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;}}

　　

新建類：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設計模式之一* 工廠模式*  設計模式是一種解決方案，就是為了處理java中所遇到的特定的一些問題*  	解決什么問題呢？*  它是用來將資源文件生產指定的實體類*  好處：*  提高了代碼的復用性*/
public class ConfigModelFactory {public static ConfigModel build() throws DocumentException {return ConfigModel("/config.xml");}/** 生產出有類內容的實體類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();//給actionmodel對象填充xml中的action標簽的內容actionmodel.setPath(element.attributeValue("path"));actionmodel.setType(element.attributeValue("type"));List<Element> list2= element.selectNodes("forward");for (Element element2 : list2) {forwardModel =new ForwardModel();	//給forwardmodel對象填充xml中的action標簽的內容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默認是true//只有填了false才是轉發//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  轉發	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());}}

　　

注釋：

本項目一共導用了兩個jar包：dom4j-1.6.1.jar? ? ?jaxen-1.1-beta-6.jar ?

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