1.什么叫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 1）根据XML配置文件元素节点创建元素节点实体类 ConfigModel、ActionModel、ForwardModel 2）利用dom4j xpath技术实现XML建模 ConfigModelFactory
ConfigModel代码如下：
代码语言：javascript复制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
* <config> ->ConfigModel
* 包含关系：ConfigModel ->ConfigModel ->ForwardModel(0~N)
* @author Administrator
*
*/
public class ConfigModel implements Serializable {
//key:代表action节点中的path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);
}
}ActionModel 代码如下：
代码语言：javascript复制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
* <action> ->ActionModel
* 包含关系：ActionModel ->ActionModel(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 forword) {
forwards.put(forword.getName(), forword);
}
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 "]";
}
}ForwardrModel 代码如下：
代码语言：javascript复制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
* <forward> ->ForwardModel
* @author zjjt
*
*/
public class ForwardModel implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
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 "]";
}
}ConfigModelFactory实现类（重点）
代码语言：javascript复制package com.zking.xmlmodel.util;
import java.io.InputStream;
import java.io.Serializable;
import java.util.List;
import org.dom4j.Document;
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 implements Serializable {
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;
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.解析XML
//注意：
//1）获取多个节点：selectNode
//2）获取单个节点：selectSingNode
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节点中所有属性信息（path、type）
String actionPath=actionElem.attributeValue("path");
String actionType=actionElem.attributeValue("type");
//8.初始化ActionModel
actionModel=new ActionModel();
actionModel.setPath(actionPath);
actionModel.setType(actionType);
//9.获取action节点所有forward节点（0~N）
List<Node> forwarNodes=actionElem.selectNodes("forward");
//10.循环遍历forward
for (Node forward : forwarNodes) {
//11.将forwar节点转化成元素节点（<forward>）
Element forwarElem=(Element) forward;
//12.获取forward节点中的所有属性（name,path以及redirect）
String forwardName=forwarElem.attributeValue("name");
String forwardPath=forwarElem.attributeValue("path");
String forwardRedirect=forwarElem.attributeValue("redirect");
//13.初始化ForwardModel
forwardmodel=new ForwardModel();
forwardmodel.setName(forwardName);
forwardmodel.setPath(forwardPath);
forwardmodel.setRedirect(Boolean.parseBoolean(forwardRedirect));
//14.将ForwardModel存入到对应的actionModel下
actionModel.push(forwardmodel);
}
//15.将actionModel存入对应的ConfigModel下
configModel.push(actionModel);
}
} catch (Exception e) {
e.printStackTrace();
}
return configModel;
}
public static void main(String[] args) {
ConfigModel configModel=ConfigModelFactory.createConfigModel();
//要求：获取config节点下的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节点下的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());
}
}以上代码供小伙伴们理解XML建模希望对大家有帮助哦！
总结一下提供思路：
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）
DTD约束：由XML的根节点往里建立约束 XML建模：由最里层节点往根节点进行建模，一个元素节点代表一个实体类
今天的XML建模内容就分享到这里啦！
