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做XML建模
2. XML建模的步骤
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
ConfigModel
ActionModel
ForwardModel
首先config.xml里面的元素是从里（①forward? ?②action? ?③config）到外取出
<?xml version="1.0" encoding="UTF-8"?>
?? ?<!--
?? ??? ?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>
? ?A.config节点下有多个子action节点，无节点属性
? ?B.action节点下有多个子forward节点，有节点属性
? ?C.forward下无子节点，有节点属性
?
ForwardModel
package com.hmf;
import java.io.Serializable;
/**
?* config点xmlforwar节点对应的建模实体类ForwardModel
?* @author T440s
?*
?*/
public class ForwardModel implements Serializable{
?? ?//forwar节点对应的name属性
?? ?private String name;
?? ?//forwar节点对应的path属性
?? ?private String path;
?? ?//forwar节点对应的redirect属性
?? ?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;
?? ?}
}
?
ActionModel
package com.hmf;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;/**
?* 将xml放入到action实体类
?* @author T440s
?*
?*/
public class ActionModel implements Serializable{
?? ?private String path;
?? ?private String type;
?? ?
?? ?//在同一个action下的name?
?? ?//key 代表forward节点的name属性，唯一
?? ?//value，将整个forward节点所对应的建模实体类ForwardModel作为value的值
?? ?private Map<String, ForwardModel> forwards=new HashMap<String, ForwardModel>();
?? ?
?? ?//压栈
?? ?public void push(ForwardModel ForwardModel1) {
?? ??? ?forwards.put(ForwardModel1.getName(),ForwardModel1);
?? ?}
?? ?
?? ?//弹栈
?? ?public ForwardModel get(String name) {
?? ??? ?return forwards.get(name);
?? ?}
?? ?
?? ?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;
?? ?}
?? ?@Override
?? ?public String toString() {
?? ??? ?return "ActionModel [path=" + path + ", type=" + type + "]";
?? ?}
?? ?
?? ?public ActionModel(String path, String type) {
?? ??? ?super();
?? ??? ?this.path = path;
?? ??? ?this.type = type;
?? ?}
?? ?public ActionModel() {
?? ??? ?// TODO Auto-generated constructor stub
?? ?}
}
?
ConfigModel
package com.hmf;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;public class ConfigModel implements Serializable{
?? ?
?? ?private Map<String, ActionModel> actions=new HashMap<String, ActionModel>();
?? ?
?? ?public Map<String, ActionModel> getAction(){
?? ??? ?return actions;
?? ?}
?? ?
?? ?public void setAction (Map<String, ActionModel> actions){
?? ??? ?this.actions=actions;
?? ?}
?? ?
?? ?@Override
?? ?public String toString() {
?? ??? ?return "ConfigModel [actions=" + actions + "]";
?? ?}
?? ?
?? ?public ConfigModel() {
?? ??? ?// TODO Auto-generated constructor stub
?? ?}?? ?public ConfigModel(Map<String, ActionModel> actions) {
?? ??? ?super();
?? ??? ?this.actions = actions;
?? ?}
?? ?
?? ?//压栈
?? ?public void push(ActionModel actionModel) {
?? ??? ?actions.put(actionModel.getPath(),actionModel);
?? ?}
?? ?//弹栈
?? ?public ActionModel get(String path) {
?? ??? ?return actions.get(path);? ? }
????public static void main(String[] args) {
?? ??? ?????????//ConfigModel对象里没有xml内容
?? ??? ?????????ConfigModel configModel=new ConfigModel();
????????????? }
?? ?}
ConfigModelFactory
package com.hmf;
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;/**
?* 建模思路：
?* 1.将原有的config.xml进行解析
?* 2.对应标签内容，将其封装赋值给相应的对象
?* ?forward标签值 赋值给forwardModel对象
?* ?action标签值 赋值给ActionModel对象
?* ?config标签值 赋值给ConModel对象
?* @author T440s
?*
?*/
public class ConfigModelFactory {
?? ?public static ConfigModel build() throws DocumentException {
?? ??? ?return build("config.xml");
?? ?}
?? ?
?? ?public static ConfigModel build(String resourcepath) throws DocumentException {
?? ??? ?InputStream in = ConfigModelFactory.class.getResourceAsStream(resourcepath);
?? ??? ?SAXReader sax=new SAXReader();
?? ??? ?Document doc = sax.read(in);
?? ??? ?ConfigModel config=new ConfigModel();
?? ??? ?List<Element> acList = doc.selectNodes("/config/action");
?? ??? ?for (Element actEle : acList) {
?? ??? ??? ?ActionModel actionModel=new ActionModel();
?? ??? ??? ?//将xml文件解析的来的path值赋值给actionModel对象中的path属性
?? ??? ??? ?actionModel.setPath(actEle.attributeValue("path"));
?? ??? ??? ?actionModel.setType(actEle.attributeValue("type"));
?? ??? ??? ?List<Element> forwardEles = actEle.selectNodes("forwardEles");
?? ??? ??? ?for(Element forwardEle : forwardEles) {
?? ??? ??? ??? ?ForwardModel forwardModel=new ForwardModel();
?? ??? ??? ??? ?forwardModel.setName(forwardEle.attributeValue("name"));
?? ??? ??? ??? ?forwardModel.setPath(forwardEle.attributeValue("path"));
?? ??? ??? ??? ?//redirect只有在配置文件赋值false的时候 是代表（转发）
?? ??? ??? ??? ?//其他都是代表重定向
?? ??? ??? ??? ?forwardModel.setRedirect(!"false".equals(forwardEle.attributeValue("redirect")));
?? ??? ??? ??? ?config.push(actionModel);
?? ??? ??? ?}
?? ??? ??? ?config.push(actionModel);
?? ??? ?}
?? ??? ?return config;
?? ?}
}
?
例如：
创建一个servlet进行建模
通过url-pattern读取到servlet-class的值
<?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>
package com.hmf01;
import java.io.InputStream;
import java.util.List;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;public class WebAppModelFactory {
?? ?public static WebAppModel buildWebAppModel() throws Exception{
?? ??? ?return buildWebAppModel("/web.xml");
?? ?}?? ?
?? ?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);
?? ??? ??? ?
?? ??? ??? ?List<Element> servletEles = doc.selectNodes("/web-app/servlet");
?? ??? ??? ?for (Element servletEle : servletEles) {
?? ??? ??? ??? ?ServletModel servletModel = new ServletModel();?? ??? ??? ??? ?
?? ??? ??? ??? ?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);
?? ??? ??? ?}?? ??? ??? ?
?? ??? ??? ?List<Element> servletMappingEles = doc.selectNodes("/web-app/servlet-mapping");
?? ??? ??? ?for (Element servletMappingEle : servletMappingEles) {
?? ??? ??? ??? ?ServletMappingModel servletMappingModel = new ServletMappingModel();?? ??? ??? ??? ?
?? ??? ??? ??? ?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;
?? ?}
?? ?
?? ?
?? ?public static String getServletClassByUrl(WebAppModel webAppModel, String url) {
?? ??? ?String servletClass = "";
?? ??? ?String servletName = "";
?? ??? ?List<ServletMappingModel> servletMappingModels = webAppModel.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();
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ?}
?? ??? ?
?? ??? ?
?? ??? ?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) throws Exception {
?? ??? ?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);
?? ?}
}
?
好了今天到这里了?