xml建模

1.什么是XML建模
将XML配置文件中的元素，属性，文本信息 转换成对象的过程叫XML建模。
2.XML建模
根据XML配置文件元素节点创建元素，节点，实体类
ConfigModel ActionModel ForwardModel
利用dom4j+xpath技术实现XML建模ConfigModelFactory（提高代码的复用性）

建模思路

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、根据XML中元素节点 情况 ConfigModel , ActionModel , ForwardModel 对象模型。 （定义对象从里到外）

package com.model;

import java.io.InputStream;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class webModelFactory {

    public static webmodel buildwebmodel() {
        String xmlPath="/web.xml";
        return buildWebAppModel(xmlPath);
    }
    /**
     * 建模
     * 
     * @param xmlPath
     * @return
     */
    public static webmodel buildWebAppModel(String xmlPath) {
        InputStream in = webModelFactory.class.getResourceAsStream(xmlPath);
        SAXReader saxReader = new SAXReader();
        webmodel webAppModel = new webmodel();
        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) {
                    urlpatternmodel urlPatternModel = new urlpatternmodel();
                    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(webmodel webModel, String url) {
        String servletClass = "";
        /*
         * 找到浏览器网址对应的servlet-name
         */
        String servletName = "";
        List<servletmappingmodel> servletMappingModels = webModel.getServletmappingmodels();
        for (servletmappingmodel servletMappingModel : servletMappingModels) {
            List<urlpatternmodel> urlPatternModels = servletMappingModel.getUrlpatternmodels();
            for (urlpatternmodel 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 = webModel.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) {
        webmodel webAppModel = webModelFactory.buildwebmodel();
        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);
        
    }
}