本文探讨了将XML字符串作为对象进行操作的建模方法，旨在提高代码复用性。建模过程包括分析XML文件中的对象及它们的行为、属性，然后使用工厂模式解析XML生成对象。文章展示了如何为XML文件创建对应的类和工厂类，如ConfigModel、ActionModel、ForwardModel等，并给出了web.xml文件建模的示例。
建模xml
建模的由来
就是将指定的xml字符串当作对象来操作
如果说当对一个指定的xml格式字符串完成了建模操作，
好处在于，只需要调用指定的方法就可以完成预定的字符串获取；
建模的思路
1、分析需要被建模的文件中有那几个对象
2、每个对象拥有的行为以及属性
3、定义对象从小到大（从里到外）
4、通过23种的设计模式中的工厂模式，解析xml生产出指定对象
好处：
提高代码的复用性
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。
首先创建一个mvc.xml的文件：（内容如下）
<?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>
有三个元素，所以需要建三个类和一个工厂类。
ConfigModel
ActionModel
ForwardModel
ConfigModelFactory
首先是元素ForwardModel
下面展示一些 内联代码片。
package com.bowen.model;
public class ForwardMOdel {
//<forward name="success" path="/login.jsp" redirect="true" />
private String name;
private String path;
private boolean redirect =true;
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;
}
}
接下来是元素ActionModel
package com.bowen.model;
import java.util.HashMap;
import java.util.Map;
public class ActionModel {
//<action path="/loginAction" type="test.LoginAction">
// <forward name="failed" path="/login.jsp" redirect="false" />
// <forward name="success" path="/main.jsp" redirect="true" />
//</action>
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;
}
/**
* 压栈 堆栈
* @param forwardMOdel
*/
public void push(ForwardMOdel forwardMOdel) {
fMap.put(forwardMOdel.getName(), forwardMOdel);
}
/**
* 弹栈
*/
public ForwardMOdel pop(String name) {
return fMap.get(name);
}
}
之后是ConfigModel
package com.bowen.model;
import java.util.HashMap;
import java.util.Map;
public class ConfigModel {
private Map<String , ActionModel> aMap=new HashMap<>();
/**
* 压栈 堆栈
* @param forwardMOdel
*/
public void push( ActionModel actionMOdel) {
aMap.put(actionMOdel.getPath(), actionMOdel);
}
/**
* 弹栈
*/
public ActionModel pop(String path) {
return aMap.get(path);
}
}
最后的是 ConfigModelFactory
package com.bowen.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;
/**
* java中有23中设计模式
* 工厂模式：
* why:
* 能够提高代码的复用性
* how:只要建立一个方法，去生产指定的你需要的对象
* where:去生产指定的你需要的对象，以便重复使用
*
* 昨天的作业来看：
* 反复操作xml文件，反复解析xml字符串
* xml文件-->ConfigModel
* 那么意味着我们需要反复操作configModel
* @author Administrator
*
*/
public class ConfigModelFactory {
/**
* 默认资源文件mvc.xml是放在建模类的同包下
* @return
* @throws DocumentException
*/
public static ConfigModel build() throws DocumentException {
return build("mvc.xml");
}
/**
* 当资源文件，需要手动改变位置的情况下，那么需要调以下方法
* @param xmlPath
* @return
* @throws DocumentException
*/
public static ConfigModel build(String xmlPath) throws DocumentException {
ConfigModel configModel = new ConfigModel();
ActionModel actionModel = null;
ForwardMOdel forwardModel = null;
InputStream in = ConfigModelFactory.class.getResourceAsStream(xmlPath);
SAXReader reader = new SAXReader();
Document doc = reader.read(in);
List<Element> actionEles = doc.selectNodes("config/action");
for (Element actionEle : actionEles) {
actionModel = new ActionModel();
// 填充actionModel
actionModel.setPath(actionEle.attributeValue("path"));
actionModel.setType(actionEle.attributeValue("type"));
List<Element> forwardEles = actionEle.selectNodes("forward");
for (Element forwardEle : forwardEles) {
forwardModel = new ForwardMOdel();
// 填充forwardModel
forwardModel.setName(forwardEle.attributeValue("name"));
forwardModel.setPath(forwardEle.attributeValue("path"));
forwardModel.setRedirect(!"false".equals(forwardEle.attributeValue("redirect")));
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());
System.out.println(actionModel.pop("success").getPath());
}
}
之后打印得：
web案例：
下面展示一些 内联代码片。（web.xml）
<?xml version="1.0" encoding="UTF-8"?>
<web-app>
<servlet>
<servlet-name>jrebelServlet</servlet-name>
<servlet-class>com.zking.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.zking.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>
下面展示一些 内联代码片（ServletNameModel.java）。
package com.bowen.model.work;
public class ServletNameModel {
private String classify;
public String getClassify() {
return classify;
}
public void setClassify(String classify) {
this.classify = classify;
}
}
下面展示一些 内联代码片(ServletMOdel.java)。
package com.bowen.model.work;
public class ServletMOdel {
private ServletNameModel servletNameModel;
private ServletClassModel servletClassModel;
public ServletNameModel getServletNameModel() {
return servletNameModel;
}
public void setServletNameModel(ServletNameModel servletNameModel) {
this.servletNameModel = servletNameModel;
}
public ServletClassModel getServletClassModel() {
return servletClassModel;
}
public void setServletClassModel(ServletClassModel servletClassModel) {
this.servletClassModel = servletClassModel;
}
}
下面展示一些 内联代码片(ServletMapingMOdel.java)。
package com.bowen.model.work;
import java.util.ArrayList;
import java.util.List;
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;
}
}
下面展示一些 内联代码片(ServletClassModel.java)。
package com.bowen.model.work;
public class ServletClassModel {
private String classify;
public String getClassify() {
return classify;
}
public void setClassify(String classify) {
this.classify = classify;
}
}
下面展示一些 内联代码片(UrlpatternModel.java)。
package com.bowen.model.work;
public class UrlpatternModel {
private String classify;
public String getClassify() {
return classify;
}
public void setClassify(String classify) {
this.classify = classify;
}
}
下面展示一些 内联代码片(WebAppModel.java)。
package com.bowen.model.work;
import java.util.ArrayList;
import java.util.List;
public class WebAppModel {
private List<ServletMOdel> serletMOdels=new ArrayList<>();
private List<ServletMapingMOdel> servletMapingMOdels=new ArrayList<>();
public void pushServletMOdel(ServletMOdel servletMOdel) {
serletMOdels.add(servletMOdel);
}
public List<ServletMOdel> getServletModels(){
return serletMOdels;
}
public void pushServletMappingMoodel(ServletMapingMOdel servletMapingMOdel) {
servletMapingMOdels.add(servletMapingMOdel);
}
public List<ServletMapingMOdel> getservletMapingMOdels(){
return servletMapingMOdels;
}
}
下面展示一些 内联代码片(WebAppModelFactory.java)。
package com.bowen.model.work;
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;
import com.bowen.wrok.ServletModel;
public class WebAppModelFactory {
public static WebAppModel buildWebAppModel() {
String xmlPath = "web.xml";
return buildWebAppModel(xmlPath);
}
/**
* 建模
* @param xmlPath
* @return
*/
public static WebAppModel buildWebAppModel(String xmlPath) {
InputStream in=WebAppModelFactory.class.getResourceAsStream(xmlPath);
SAXReader saxReader=new SAXReader();
WebAppModel webAppModel=new WebAppModel();
try {
Document doc=saxReader.read(in);
/**
* 将servlet的标签内容填充webApp
*/
List<Element> servletEles=doc.selectNodes("/web-app/servlet");
for (Element servletEle : servletEles) {
ServletMOdel servletMOdel=new ServletMOdel();
/**
* 给ServletMOdel填充xml的内容
*/
Element servleNameEle=(Element) servletEle.selectSingleNode("servlet-name");
Element servleClassEle=(Element) servletEle.selectSingleNode("servlet-class");
ServletNameModel servletNameModel =new ServletNameModel();
ServletClassModel servletClassModel=new ServletClassModel();
servletNameModel.setClassify(servleNameEle.getText());
//System.out.println(servleNameEle.getText());
servletClassModel.setClassify(servleClassEle.getText());
servletMOdel.setServletNameModel(servletNameModel);
servletMOdel.setServletClassModel(servletClassModel);
webAppModel.pushServletMOdel(servletMOdel);
}
/**
* 将servlet-mapping的标签内容填充
*/
List<Element> servletMappingEles=doc.selectNodes("/web-app/servlet-mapping");
for (Element servletMappingEle : servletMappingEles) {
ServletMapingMOdel servletMappingModel = new ServletMapingMOdel();
/*
* 给ServletMappingModel填充xml的内容
*/
Element servletNameEle = (Element)servletMappingEle.selectSingleNode("servlet-name");
ServletNameModel servletNameModel=new ServletNameModel();
servletNameModel.setClassify(servletNameEle.getText());
//System.out.println(servletNameEle.getText());
servletMappingModel.setServletNameModel(servletNameModel);
List<Element> UrlpatternModel=servletMappingEle.selectNodes("url-pattern");
for (Element urlPatternEle : UrlpatternModel) {
UrlpatternModel urlpatternModel=new UrlpatternModel();
urlpatternModel.setClassify(urlPatternEle.getText());
//System.out.println(urlPatternEle.getText());
servletMappingModel.pushUrlPatternModel(urlpatternModel);
}
webAppModel.pushServletMappingMoodel(servletMappingModel);
}
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return webAppModel;
}
/**
* 通过浏览器输入的网址自动找到对应的后台处理类
* 建模后的实体类
* 浏览器访问的网址
*/
public static String getServletClassByUrl(WebAppModel webappModel,String url) {
String servletClass = "";
/*
* 找到浏览器网址对应的servlet-name
*/
String servletName = "";
List<ServletMapingMOdel> servletMapingMOdels=webappModel.getservletMapingMOdels();
for (ServletMapingMOdel servletMlistapingMOdel : servletMapingMOdels) {
List<UrlpatternModel> urlpatternModels=servletMlistapingMOdel.getUrlPatternModels();
for (UrlpatternModel urlpatternModel : urlpatternModels) {
if(url.equals(urlpatternModel.getClassify())) {
ServletNameModel servletNameModel=servletMlistapingMOdel.getServletNameModel();
servletName =servletNameModel.getClassify();
}
}
}
List<ServletMOdel> servletModels = webappModel.getServletModels();
for (ServletMOdel servletMOdel : servletModels) {
ServletNameModel servletNameModel=servletMOdel.getServletNameModel();
if(servletName.equals(servletNameModel.getClassify())) {
ServletClassModel servletClassModel=servletMOdel.getServletClassModel();
servletClass=servletClassModel.getClassify();
}
}
return servletClass;
}
public static void main(String[] args) {
WebAppModel 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);
}
}
结果如下：
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