XML建模实列

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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:

XML建模实列-LMLPHP

05-11 17:23
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