XML建模
建模的由来：
就是将指定的xml字符串当作对象来操作
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；
建模的一个思路：
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
注：属性为String类型，子元素标签则是map的值，子元素标签的唯一标识则为map的值
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。
实列：
实列是通过对一个web.xml文件进行建模
web.xml文件信息
<?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>
分析出xml文件中的属性以及行为，创建Model（模型）对象
.分析出以下所有对象
ServletNameModel (servlet-name)
package com.zking.ServletModel;
public class ServletNameModel {
private String context;
public String getContext() {
return context;
}
public void setContext(String context) {
this.context = context;
}
}ServletClassModel (servlet-class)
package com.zking.ServletModel;
public class ServletClassModel {
private String context;
public String getContext() {
return context;
}
public void setContext(String context) {
this.context = context;
}
}ServletUrlpatternModel (url-pattern)
package com.zking.ServletModel;
public class ServletUrlPatternModel {
private String context;
public String getContext() {
return context;
}
public void setContext(String context) {
this.context = context;
}
}ServletModel (servlet)
package com.zking.ServletModel;
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;
}
}ServletMappingModel (servlet-Mapping)
package com.zking.ServletModel; import java.util.ArrayList;
import java.util.List; import org.w3c.dom.ls.LSInput; public class ServletMappingModel { private ServletNameModel servletNameModel;
private List<ServletUrlPatternModel> servletUrlPatternModels= new ArrayList<>(); public ServletNameModel getServletNameModel() {
return servletNameModel;
} public void pushUrlPatternModel(ServletUrlPatternModel urlPatternModel) {
servletUrlPatternModels.add(urlPatternModel);
} public void setServletNameModel(ServletNameModel servletNameModel) {
this.servletNameModel = servletNameModel;
} public List<ServletUrlPatternModel> getServletUrlPatternModels() {
return servletUrlPatternModels;
} }
ServletWebAppModel (web-app)
package com.zking.ServletModel; import java.util.ArrayList;
import java.util.List; public class ServletWebAppModel { private List<ServletModel> servletModels=new ArrayList<>();
private List<ServletMappingModel> servletMappingModels = new ArrayList<>(); public List<ServletModel> getServletModels() {
return servletModels;
} public List<ServletMappingModel> getServletMappingModels() {
return servletMappingModels;
} public void pushServletModel(ServletModel servletModel) {
servletModels.add(servletModel);
} public void pushServletMappingModel(ServletMappingModel servletMappingModel) {
servletMappingModels.add(servletMappingModel);
} }
用的是23种设计模式中的工厂模式，Factory
package com.zking.ServletModel; import java.io.InputStream;
import java.util.List; import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader; public class ServletWebFactory { public static ServletWebAppModel buildWebAppModel() {
String xmlPath = "/web.xml";
return buildWebAppModel(xmlPath);
} /**
* 建模
*
* @param xmlPath
* @return
*/
public static ServletWebAppModel buildWebAppModel(String xmlPath) {
InputStream in = ServletWebFactory.class.getResourceAsStream(xmlPath);
SAXReader saxReader = new SAXReader();
ServletWebAppModel webAppModel = new ServletWebAppModel();
try {
Document doc = saxReader.read(in);
/*
* 将servlet的标签内容填充进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 servletNameEle = (Element) servletEle.selectSingleNode("servlet-name");
Element servletClassEle = (Element) servletEle.selectSingleNode("servlet-class");
ServletNameModel servletNameModel = new ServletNameModel();
ServletClassModel servletClassModel = new ServletClassModel();
servletNameModel.setContext(servletNameEle.getText());
servletClassModel.setContext(servletClassEle.getText()); servletModel.setServletNameModel(servletNameModel);
servletModel.setServletClassModel(servletClassModel); webAppModel.pushServletModel(servletModel);
} /*
* 将servlet-mapping的标签内容填充进WebApp
*/
List<Element> servletMappingEles = doc.selectNodes("/web-app/servlet-mapping");
for (Element servletMappingEle : servletMappingEles) {
ServletMappingModel servletMappingModel = new ServletMappingModel(); /*
* 给ServletMappingModel填充xml的内容
*/
Element servletNameEle = (Element) servletMappingEle.selectSingleNode("servlet-name");
ServletNameModel servletNameModel = new ServletNameModel();
servletNameModel.setContext(servletNameEle.getText());
servletMappingModel.setServletNameModel(servletNameModel); List<Element> urlPatternEles = servletMappingEle.selectNodes("url-pattern");
for (Element urlPatternEle : urlPatternEles) {
ServletUrlPatternModel urlPatternModel = new ServletUrlPatternModel();
urlPatternModel.setContext(urlPatternEle.getText());
servletMappingModel.pushUrlPatternModel(urlPatternModel);
} webAppModel.pushServletMappingModel(servletMappingModel);
} } catch (Exception 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
* @param webAppModel 建模后的实体类
* @param url 浏览器访问的网址
* @return
*/
public static String getServletClassByUrl(ServletWebAppModel webAppModel, String url) {
String servletClass = "";
/*
* 找到浏览器网址对应的servlet-name
*/
String servletName = "";
List<ServletMappingModel> servletMappingModels = webAppModel.getServletMappingModels();
for (ServletMappingModel servletMappingModel : servletMappingModels) {
List<ServletUrlPatternModel> urlPatternModels = servletMappingModel.getServletUrlPatternModels();
for (ServletUrlPatternModel urlPatternModel : urlPatternModels) {
if(url.equals(urlPatternModel.getContext())) {
ServletNameModel servletNameModel = servletMappingModel.getServletNameModel();
servletName = servletNameModel.getContext();
}
}
} /*
* 找到servlet-name对应的后台处理类
*/
List<ServletModel> servletModels = webAppModel.getServletModels();
for (ServletModel servletModel : servletModels) {
ServletNameModel servletNameModel = servletModel.getServletNameModel();
if(servletName.equals(servletNameModel.getContext())) {
ServletClassModel servletClassModel = servletModel.getServletClassModel();
servletClass = servletClassModel.getContext();
}
}
return servletClass;
} public static void main(String[] args) {
ServletWebAppModel webAppModel = ServletWebFactory.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); } }
运行代码得到结果：