public static void main(String[] args) throws Exception {InputStream in=XmlDemo.class.getResourceAsStream("config.xml");        SAXReader sax= new SAXReader();Document doc=sax.read(in);//获取所有action中的type的值List<Element> stuEles= doc.selectNodes("/config/action");for (Element stuEle : stuEles) {String type=stuEle.attributeValue("type");System.out.println(type);}

List<Element> stuEles= doc.selectNodes("/config/action");for (Element stuEle : stuEles) {if("/loginAction".equals(stuEle.attributeValue("path"))) {String type=stuEle.attributeValue("type");System.out.println(type);}}

List<Element> stuEles= doc.selectNodes("/config/action");for (Element stuEle : stuEles) {if("/loginAction".equals(stuEle.attributeValue("path"))) {List<Element> ford=(List<Element>) stuEle.selectNodes("forward");for (Element element : ford) {String path=element.attributeValue("path");System.out.println(path);}               }}

List<Element> stuEles= doc.selectNodes("/config/action");for (Element stuEle : stuEles) {if("/loginAction".equals(stuEle.attributeValue("path"))) {List<Element> ford=(List<Element>) stuEle.selectNodes("forward");for (Element element : ford) {if("success".equals(element.attributeValue("name"))) {String path=element.attributeValue("path");System.out.println(path);}}}}

<?xml version="1.0" encoding="UTF-8"?>
<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>

package com.zking.model;public class FowardModel {
/** 添加节点属性*/private String name;private String path;private Boolean reairect;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 getReairect() {return reairect;}public void setReairect(Boolean reairect) {this.reairect = reairect;}
}

package com.zking.model;import java.util.HashMap;
import java.util.Map;public class ActionModel {private String path;private String type;private Map<String, FowardModel> 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;}//存放到Map集合public void push(FowardModel fowardModel) {fmap.put(fowardModel.getName(), fowardModel);}//获取 返回FowardModelpublic FowardModel pop(String name) {return    fmap.get(name);}
}

package com.zking.model;import java.util.HashMap;
import java.util.Map;public class ConfigModel {private Map<String, ActionModel> amap=new HashMap<>();public void push(ActionModel actionModel) {amap.put(actionModel.getPath(), actionModel);}public ActionModel pop(String path) {return amap.get(path);}
}

package com.zking.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;/** * 23设计模式之一:工厂模式   用来将资源文件生产指定的实体类* 处理Java中所遇到的一些特定的一些问题* * 好处：*     提高代码复用性*/
public class ConfigModelFactory {public static ConfigModel build() throws DocumentException {return ConfigModel("config.xml");}
/** 生产出有类容的实体类ConfigModel*/private static ConfigModel ConfigModel(String xmlPath) throws DocumentException {// TODO Auto-generated method stub// 创建ConfigModel对象ConfigModel    configModel=new ConfigModel();ActionModel actionModel=null;FowardModel fowardModel=null;InputStream in = ConfigModelFactory.class.getResourceAsStream(xmlPath);SAXReader saxRead=new SAXReader();Document doc = saxRead.read(in);List<Element> actionEles = doc.selectNodes("/config/action");for (Element actionEle : actionEles) {actionModel=new ActionModel();//给actionModel对象填充Xml中的action标签的类容actionModel.setPath(actionEle.attributeValue("path"));actionModel.setType(actionEle.attributeValue("type"));List<Element> fowardEles = actionEle.selectNodes("foward");for (Element fowardEle : fowardEles) {fowardModel=new FowardModel();//给fowardModel对象填充Xml中的foward标签的类容fowardModel.setName(fowardEle.attributeValue("name"));fowardModel.setPath(fowardEle.attributeValue("path"));fowardModel.setReairect(!"false".equals(fowardEle.attributeValue("redirect")));//<forward name="failed" path="/login.jsp" redirect="false" />
//               redirect默认true 重定向//只有false才是转发//fowardEle.attributeValue("redirect")拿到是xml中你所填的值//不填  重定向  !"false".equals(fowardEle.attributeValue("redirect")) false//填 true 重定向   !"false".equals(fowardEle.attributeValue("redirect")) false//填false 转发   !"false".equals(fowardEle.attributeValue("redirect")) true
                actionModel.push(fowardModel);}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());}}

package com.zking.xml.webModel;public class ServletClassModel {private String context;public String getContext() {return context;}public void setContext(String context) {this.context = context;}
}

package com.zking.xml.webModel;import java.util.ArrayList;
import java.util.List;public class ServletMappingModel {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;}
}

package com.zking.xml.webModel;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;}}

package com.zking.xml.webModel;public class ServletNameModel {private String context;public String getContext() {return context;}public void setContext(String context) {this.context = context;}
}

package com.zking.xml.webModel;public class UrlPatternModel {private String context;public String getContext() {return context;}public void setContext(String context) {this.context = context;}}

package com.zking.xml.webModel;import java.util.ArrayList;
import java.util.List;public class WebAppModel {private List<ServletModel> servletModels = new ArrayList<>();private List<ServletMappingModel> servletMappingModels = new ArrayList<>();public void pushServletModel(ServletModel servletModel) {servletModels.add(servletModel);}public List<ServletModel> getServletModels() {return servletModels;}public void pushServletMappingModel(ServletMappingModel servletMappingModel) {servletMappingModels.add(servletMappingModel);}public List<ServletMappingModel> getServletMappingModels() {return servletMappingModels;}}

package com.zking.xml.webModel;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() {String xmlPath = "/web.xml";return buildWebAppModel(xmlPath);}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) {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);}
}