Xml解析作业与Xml建模andXml建模作业

  作业：config.xml解析

1、获取所有action中的type的值

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);
                
        }

2、获取第二个action中的type的值

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);
            }
        }

 3、获取第二个action的所有forward的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) {
                    String path=element.attributeValue("path");
                    System.out.println(path);
                }               
            }
        }

4、获取第二个action的第二个forward的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建模

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

                    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

2. XML建模类
                      ConfigModel
                      ActionModel
                      ForwardModel
                      ConfigModelFactory

建模的思路

                     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、定义对象从小到大（从里到外）
                     4、通过23种的设计模式中的工厂模式，解析xml生产出指定对象
                     好处：
                                          提高代码的复用性

4.利用工程模式+dom4j+xpath解析XML配置文件

Config.xml文件

<?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>

3.使用Map集合存放子节点元素，其中Key为子节点的唯一属性，Value为整个子节点对象。

定义对象实体类

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;
    }
}

行为及属性 

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FowardModel
    public 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);
    }
   
}

4.利用工程模式+dom4j+xpath解析XML配置文件

导入dom4j包

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());
    }
    
}

控制台输入结果：

Xml建模作业

ServletClassModel

package com.zking.xml.webModel;

public class ServletClassModel {
    private String context;

    public String getContext() {
        return context;
    }

    public void setContext(String context) {
        this.context = context;
    }
}

ServletMappingModel

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;
    }
}

ServletModel

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;
    }

}

ServletNameModel

package com.zking.xml.webModel;

public class ServletNameModel {
    private String context;

    public String getContext() {
        return context;
    }

    public void setContext(String context) {
        this.context = context;
    }
}

UrlPatternModel 

package com.zking.xml.webModel;

public class UrlPatternModel {
    private String context;

    public String getContext() {
        return context;
    }

    public void setContext(String context) {
        this.context = context;
    }

}

WebAppModel

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;
    }

}

WebAppModelFactory

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);
        
    }
}

                                                                                                                                                                                                                                                                                                 2019-06-1119:22:01

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原文地址：https://www.cnblogs.com/xcn123/p/11005515.html