XML建模

package com.zking.xmlmodel.entity;
import java.io.Serializable;
import java.util.HashMap;
/**
 * 对应config.xml中config节点所建立的建模实体类
 * <config> -> ConfigModel
 * 包含关系：ConfigModel -> ActionModel -> ForwardModel(0~N) 
 * @author Administrator
 *
 */
import java.util.Map;
public class ConfigModel implements Serializable {
  //key：代表action节点中的name属性：唯一
  //value:代表action节点本身
  private Map<String, ActionModel> actions = new HashMap<>();
  public void push(ActionModel action) {
  actions.put(action.getPath(), action);
  }
  public ActionModel get(String path) {
  return actions.get(path);
  }
}

package com.zking.xmlmodel.entity;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
/**
 * 对应config.xml中action节点所建立的建模实体类
 * <action> -> ActionModel
 * 包含关系：ActionModel -> ForwardModel(0~N) 
 * @author Administrator
 *
 */
public class ActionModel implements Serializable{
  private String path;
  private String type;
  //key：代表forward节点中的name属性：唯一
  //value:代表forward节点本身
  private Map<String, ForwardModel> forwards = new HashMap<>();
  public void push(ForwardModel forward) {
  forwards.put(forward.getName(),forward);
  }
  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;
  }
  public ActionModel() {
  super();
  }
  @Override
  public String toString() {
  return "ActionModel [path=" + path + ", type=" + type + "]";
  }
}
Pattern：这是正则表达式的编译表示。要使用此功能，必须首先在模式类中调用静态方法（编译），该方法返回一个模式对象。
Matcher：这是解释模式并针对输入字符串执行匹配操作的引擎。要获得一个对象，必须在Pattern对象上调用matcher方法。
ActionModel创建好后就创建action元素里的forward
下面是ForwardModel
package com.zking.xmlmodel.entity;
import java.io.Serializable;
/**
 * 对应config.xml中forward节点所建立的建模实体类
 * <forward> -> ForwardModel
 * @author Administrator
 *
 */
public class ForwardModel implements Serializable{
  private String name;
  private String path;
  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;
  }
  public ForwardModel() {
  super();
  }
  @Override
  public String toString() {
  return "ForwardModel [name=" + name + ", path=" + path + ", redirect=" + redirect + "]";
  }
}

package com.zking.xmlmodel.util;
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;
import com.zking.xmlmodel.entity.ActionModel;
import com.zking.xmlmodel.entity.ConfigModel;
import com.zking.xmlmodel.entity.ForwardModel;
public class ConfigModelFactory {
  public static final String DEFAULT_PATH="/config.xml";
  private ConfigModelFactory() {}
  public static ConfigModel createConfigModel() {
  return createConfigModel(DEFAULT_PATH);
  }
  public static ConfigModel createConfigModel(String path) {
  ConfigModel configModel = new ConfigModel();
  ActionModel actionModel = null;
  ForwardModel forwardModel = null;
  //目标：使用dom4j+xpath技术实现XML解析建模操作
  try {
    //1.获取文件输入流
    InputStream is = 
      ConfigModelFactory.class.getResourceAsStream(path);
    //2.创建SAXReader对象
    SAXReader saxReader = new SAXReader();
    //3.读取文件输入流并转换成Document对象
    //注：Document包含整个XML中的元素、属性以及文本信息！
    Document doc = saxReader.read(is);
    //4.准备解析XML
    //注意：
    //1)获取多个节点：selectNodes
    //2)获取单个节点:selectSingleNode
    List<Node> actionNodes = doc.selectNodes("config/action");
    //5.循环遍历
    for (Node action : actionNodes) {
    //6.将action节点转换成元素节点（<action>）
    Element actionElem = (Element) action;
    //7.获取action节点中的所有属性信息（path、type）
    String actionPath = actionElem.attributeValue("path");
    //8.初始化ActionModel
    actionModel = new ActionModel();
    actionModel.setPath(actionPath);
    actionModel.setType(actionPath);
    //9.获取action节点下所有的forward节点（0~N）
    List <Node> forwardNodes = 
      actionElem.selectNodes("forward");
    //10.循环遍历forward
    for (Node forward : forwardNodes) {
      //11.将forward节点转换成元素节点（<forward>）
      Element forwardElem = (Element) forward;
      //12.获取forward节点的所有属性（name,path,redirect）
      String forwardName = forwardElem.attributeValue("name");
      String forwardPath = forwardElem.attributeValue("path");
      String forwardRedirect = forwardElem.attributeValue("redirect");
      //13.初始化forwardElem
      forwardModel = new ForwardModel();
      forwardModel.setName(forwardName);
      forwardModel.setPath(forwardPath);
      forwardModel.setRedirect(Boolean.parseBoolean(forwardRedirect));
      //14.将forwardModel存放到对应的actionModel下
      actionModel.push(forwardModel);
    }
    //15.将actionModel存放到对应的ConfigModel下
    configModel.push(actionModel);
    }
  } catch (DocumentException e) {
    e.printStackTrace();
  }
  return configModel;
  }
  public static void main(String[] args) {
  ConfigModel configModel = ConfigModelFactory.createConfigModel();
  //要求：获取config节点下action节点的path属性等于/loginAction的节点对象
  ActionModel actionModel = configModel.get("/loginAction");
  System.out.println("path="+actionModel.getPath());
  System.out.println("type="+actionModel.getType());
  //要求：获取action节点下forward节点的name属性等于success
  ForwardModel forwardModel = actionModel.get("success");
  System.out.println("name="+forwardModel.getName());
  System.out.println("path="+forwardModel.getPath());
  System.out.println("redirect="+forwardModel.isRedirect());
  }
}