xml解析

1、ActionModel.java

package com.huangyucan.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);
    }
}

2、ConfigModel.java

package com.huangyucan.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());
        
    }
}

3、ForwardModel.java

package com.huangyucan.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;
    }
}

4、ConfigModelFactory.java

注意导包

WebContent路径下的lib中放入

WebContent/WEB-INF/lib/dom4j-1.6.1.jar

WebContent/WEB-INF/lib/jaxen-1.1-beta-6.jar

package com.huangyucan.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
 * 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
 * 工厂模式
 *         解决什么问题？
 *         它是用来将资源文件生产指定的实体类
 *         好处：
 *             提高了代码的复用性
 * @author Admin
 *
 */
public class ConfigModelFactory {

    public static ConfigModel build() throws DocumentException {
        return ConfigModel("/config.xml");
    }
    
    /**
     * 生产出有类容的实体类configModel 
     * @param xmlPath
     * @return
     * @throws DocumentException 
     */
    private static ConfigModel ConfigModel(String xmlPath) throws DocumentException {
        ConfigModel configModel=new ConfigModel();
        ActionModel actionModel=null;
        ForwardModel forwardModel=null;
        InputStream in=ConfigModelFactory.class.getResourceAsStream(xmlPath);
        SAXReader saxReader=new SAXReader();
        Document doc= saxReader.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> forwardEles=actionEle.selectNodes("forward");
            for (Element forwardEle : forwardEles) {
                forwardModel=new ForwardModel();
                //给forwardModel对象填充xml中的action标签的类容
                forwardModel.setName(forwardEle.attributeValue("name"));
                forwardModel.setPath(forwardEle.attributeValue("path"));
                forwardModel.setRedirect(!"false".equals(forwardEle.attributeValue("Redirect")));
//                redirect默认是true    重定向
//                只有填了false才是转发
                //forwardEle.attributeValue("redirect")拿到的是XML中你所填的值
//                不填    重定向    "false".equals(forwardEle.attributeValue("Redirect"))是false
//                填    true 重定向     "false".equals(forwardEle.attributeValue("Redirect"))是false
//                填    false 转发    "false".equals(forwardEle.attributeValue("Redirect"))是true
                actionModel.push(forwardModel);
            }
            configModel.push(actionModel);
        }
        return configModel;
    }
    public static void main(String[] args) throws DocumentException {
        ConfigModel configModel=ConfigModelFactory.build();
        ActionModel actionModel=configModel.pop("/loginAction");
        ForwardModel forwardModel=actionModel.pop("success");
        System.out.println(actionModel.getType());
        System.out.println(forwardModel.getPath()) ;
    }
}

5、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>