• xml通过dom4j解析成java对象


    要解析的xml

    <?xml version="1.0" encoding="UTF-8"?>
    <config>
    	<action path="/regAction" type="test.RegAction">
    		<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>
    

    java代码解析前一定要先把jar包导入
    在这里插入图片描述
    接下来我来定义实体类
    实体类根据上面的xml去定义。实体类定义的顺序一定是由里向外去定义的。
    定义顺序 forward标签模型 -> actiong标签模型 -> config标签模型

    forward标签模型

    public class ForwardModal {
    
    	public ForwardModal() {
    		super();
    	}
    	
    	
    	public ForwardModal(String name, String path, boolean redirct) {
    		super();
    		this.name = name;
    		this.path = path;
    		this.redirct = redirct;
    	}
    	private String name;
    	private String path;
    	private boolean redirct;
    
    	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 isRedirct() {
    		return redirct;
    	}
    	public void setRedirct(boolean redirct) {
    		this.redirct = redirct;
    	}
    	@Override
    	public String toString() {
    		return "ForwardModal [name=" + name + ", path=" + path + ", redirct=" + redirct + "]";
    	}
    }
    

    action标签模型

    
    /**
     * Action标签模型
     * @author 20190313
     *
     */
    public class ActionModal {
    	private String path;
    	private String type;
    	private Map<String, ForwardModal> map = new HashMap<>();
    	public void addForwardModal(ForwardModal forwardModal) {
    		//判断当前的name是不是有重复数据,如果没有则添加,有则跳过
    		if(!map.containsKey(forwardModal.getName())) {
    			map.put(forwardModal.getName(), forwardModal);
    		}
    	}
    	public ForwardModal getForwardModal(String key) {
    		return map.get(key);
    	}
    	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;
    	}
    	@Override
    	public String toString() {
    		return "ActionModal [path=" + path + ", type=" + type + ", map=" + map + "]";
    	}
    }
    
    

    config标签模型

    public class ConfigModal {
    	private Map<String, ActionModal> map = new HashMap<>();
    	
    	
    	public void addActionModal(ActionModal actionModal) {
    		if(!map.containsKey(actionModal.getType())) {
    			map.put(actionModal.getType(), actionModal);
    		}
    	}
    	
    	public ActionModal getActionModal(String key) {
    		return map.get(key);
    	}
    
    	@Override
    	public String toString() {
    		return "ConfigModal [map=" + map + "]";
    	}
    }
    

    将xml解析成java对象的工厂类
    记住解析的方式一定是从外往里。先解析 config节点 config节点里面添加action节点。 action节点中添加forward节点

    /**
     * 配置文件转成java对象的工厂类
     * 
     * @author 20190313
     *
     */
    public class ConfigFactory {
    	private static final String DEFAUL_PATH = "/config.xml";
    	// 单利模式:只会创建一个对象
    	private static ConfigModal configModal = null;
    
    	/**
    	 * 加载默认路径下的信息
    	 * 
    	 * @return
    	 */
    	public static ConfigModal createConfig() {
    		return createConfig(DEFAUL_PATH);
    	}
    
    	/**
    	 * 加载指定目录下的信息
    	 * 返回解析xml后等到的对象(ConfigModal)
    	 * @param path
    	 * @return
    	 */
    	public static ConfigModal createConfig(String path) {
    		if (configModal == null) {
    			configModal = new ConfigModal();
    		}
    
    		// 开始Dom4j解析
    		SAXReader saxReader = new SAXReader();
    		try {
    			//生成指定路径对应的xml文档对象
    			Document document = saxReader.read(ConfigFactory.class.getResourceAsStream(path));
    			// 读取ActionModal对象到configModal中
    			createAction(document, configModal);
    		} catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		
    		return configModal;
    	}
    	
    	//这是将action节点解析成ActiongModal对象并放入ConfigModal
    	private static void createAction(Document document, ConfigModal configModal) {
    		List actionList = document.selectNodes("/config/action");
    		//读取当前action节点的属性 并对当前action对象的属性进行赋值
    		ActionModal actionModal= null;
    		for (Object object : actionList) {
    			actionModal = new ActionModal();
    			Element actionElement = (Element)object;
    			// 给当前的属性进行赋值
    			actionModal.setPath(actionElement.attributeValue("path"));
    			actionModal.setType(actionElement.attributeValue("type"));
    			//给当前的action添加ForWord的属性 
    			createFrowrd(actionElement, actionModal);
    			configModal.addActionModal(actionModal);
    		}
    	}
    	
    	//将frowrd节点解析成FrowrdModal并放入ActiongModal对象中
    	private static void createFrowrd(Element actionElement, ActionModal actionModal) {
    		List forwardList = actionElement.selectNodes("forward");
    		ForwardModal forwardModal = null;
    		for (Object object : forwardList) {
    			forwardModal = new ForwardModal();
    			Element forwardElement = (Element)object;
    			forwardModal.setName(forwardElement.attributeValue("name"));
    			forwardModal.setPath(forwardElement.attributeValue("path"));
    			forwardModal.setRedirct(Boolean.valueOf(forwardElement.attributeValue("redirect")));
    			actionModal.addForwardModal(forwardModal);
    		}
    	}
    }
    
    

    测试一下

    	public static void main(String[] args) {
    		ConfigModal configModal = ConfigFactory.createConfig();
    		System.out.println(configModal.getActionModal("test.RegAction").getPath());
    		System.out.println(configModal.getActionModal("test.RegAction").getType());
    		System.out.println(configModal.getActionModal("test.RegAction").getForwardModal("failed").getPath());
    	}
    

    控制台打印结果

    /regAction
    test.RegAction
    /reg.jsp
    
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  • 原文地址:https://www.cnblogs.com/IT-CPC/p/10942681.html
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