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）

ConfigModelFactory.java

 1
 2 package com.zking.model;
 3 import java.io.InputStream;
 4 import java.util.List;
 5 
 6 import org.dom4j.Document;
 7 import org.dom4j.DocumentException;
 8 import org.dom4j.Element;
 9 import org.dom4j.io.SAXReader;
10 
11 /**
12  * 23设计模式之一
13  * 设计模式是一种解决方案，是为了处理Java中搜遇到特定的一问题
14  * 工厂模式
15  *         解决什么问题？
16  *         它是用来将资源文件生产指定的实体类
17  *         好处：
18  *             提高了代码的复用性
19  * 
20  * @author Admin
21  *
22  */
23 public class ConfigModelFactory {
24 
25     public static ConfigModel build() throws DocumentException {
26         return ConfigModel("config.xml");
27     }
28     
29     /**
30      * 生产出有类容的实体类configModel 
31      * @param xmlPath
32      * @return
33      * @throws DocumentException 
34      */
35     private static ConfigModel ConfigModel(String xmlPath) throws DocumentException {
36         ConfigModel configModel=new ConfigModel();
37         ActionModel actionModel=null;
38         ForwardModel forwardModel=null;
39         InputStream in=ConfigModelFactory.class.getResourceAsStream(xmlPath);
40         SAXReader saxReader=new SAXReader();
41         Document doc= saxReader.read(in);
42         List<Element> actionEles =doc.selectNodes("/config/action");
43         for (Element actionEle : actionEles) {
44             actionModel=new ActionModel();
45             //给actionModel对象填充xml中的action标签的类容
46             actionModel.setPath(actionEle.attributeValue("path"));
47             actionModel.setPath(actionEle.attributeValue("type"));
48             List<Element> forwardEles=actionEle.selectNodes("forward");
49             for (Element forwardEle : forwardEles) {
50                 forwardModel=new ForwardModel();
51                 //给forwardModel对象填充xml中的action标签的类容
52                 forwardModel.setName(forwardEle.attributeValue("name"));
53                 forwardModel.setPath(forwardEle.attributeValue("path"));
54                 forwardModel.setRedirect(!"false".equals(forwardEle.attributeValue("Redirect")));
55 //                redirect默认是true    重定向
56 //                只有填了false才是转发
57                 //forwardEle.attributeValue("redirect")拿到的是XML中你所填的值
58 //                不填    重定向    "false".equals(forwardEle.attributeValue("Redirect"))是false
59 //                填    true 重定向     "false".equals(forwardEle.attributeValue("Redirect"))是false
60 //                填    false 转发    "false".equals(forwardEle.attributeValue("Redirect"))是true
61                 
62                 
63                 actionModel.push(forwardModel);
64             }
65             configModel.push(actionModel);
66         }
67         return configModel;
68     }
69      
70     public static void main(String[] args) throws DocumentException {
71         ConfigModel configModel=ConfigModelFactory.build();
72         ActionModel actionModel=configModel.pop("/loginAction");
73         System.out.println(actionModel.getType());
74         
75     }
76     
77     
78 }


ConfigModel.java

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 actionmdodel) {
        amap.put(actionmdodel.getPath(), actionmdodel);
    }
    
    public ActionModel pop(String path) {
        return amap.get(path);
    }
    
    public static void main(String[] args) {
        ConfigModel configModel=new ConfigModel();
        ActionModel actionModel=configModel.pop("/loginAction");
        System.out.println(actionModel.getType());
        
    }
}

ForwardModel.java

package com.zking.model;

public class ForwardModel {

    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;
    }
    
    
    
}

ActionModel.java

package com.zking.model;

import java.util.HashMap;
import java.util.Map;

public class ActionModel {

    
    private String path;
    private String type;
    private Map<String, ForwardModel> 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;
    }
    public void push(ForwardModel forwardmodel) {
        fmap.put(forwardmodel.getName(), forwardmodel);
    }
    
    public ForwardModel pop(String name) {
        return fmap.get(name);
    }
    
    
}

config.xml

<?xml version="1.0" encoding="UTF-8"?><!--
        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 
    -->
    <!--
        config标签:可以包含0~N个action标签 
    -->
<config>
    
    <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>

建模思路

xml的建模

ConfigModelFactory.java

猜你喜欢