java-ee java eclipse map J2EE&XML建模

目录

用一个xml-config文件实例：

先看config.xml文件

再看 ActionModel

ConfigModel

ActionNotFoundException

ForwardNotFoundException

ConfigModelFactory

ActionDuplicateDefinitionException

ForwardDuplicateDefinitionException

InvalidPathException

用一个xml-config文件实例：

 ActionModelConfigModelForwardModel     ActionNotFoundExceptionForwardNotFoundExceptionConfigModelFactoryActionDuplicateDefinitionExceptionForwardDuplicateDefinitionExceptionInvalidPathException

先看config.xml文件

path CDATA #REQUIRED

type CDATA #REQUIRED

>

name CDATA #REQUIRED

path CDATA #REQUIRED

redirect (true|false) "false"

>

]>

再看 ActionModel

package com.zking.mymvc.framework;

import java.util.HashMap;

import java.util.Map;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

/**

* ActionModel类：表示一个Action的模型，包含了Action的路径、类型、转发模型、重定向等属性

* */

public class ActionModel {

private String path; //Action的路径

private String type; //Action的类型，例如：request、ajax等

private static Pattern pattern = Pattern.compile("^/.+$"); //静态的正则表达式，用于匹配Action的路径

private Map forwardmap = new HashMap<>(); //转发模型的HashMap

private Boolean redirect; //是否重定向

public String getPath() {

return path;

}

public void setPath(String path) {

checkPath(path); //校验Action的路径是否符合规范，即必须以/开头

this.path = path;

}

public String getType() {

return type;

}

public void setType(String type) {

this.type = type;

}

// put()方法用于将ForwardModel转发模型添加到HashMap集合中；

public void put(ForwardModel forward) {

if(!forwardmap.containsKey(forward.getName())) {

forwardmap.put(forward.getName(), forward); //添加转发模型

}

else {

throw new ForwardDuplicateDefinitionException("forward name:"+forward.getName()+" 不能重复");

//如果转发模型已经存在，则抛出ForwardDuplicateDefinitionException异常

}

}

// find()方法用于查找指定名称的转发模型，如果不存在则抛出ForwardNotFoundException异常

public ForwardModel find(String name) {

if(!forwardmap.containsKey(name)) {

return forwardmap.get(name);

}

else {

throw new ForwardNotFoundException("forward name:"+name+"不存在");

//如果转发模型不存在，则抛出ForwardNotFoundException异常

}

}

// setRedirect()方法用于设置属性redirect的值必须为true或者false；

public void setRedirect(String redirect) {

if("true".equals(redirect) || "false".equals(redirect)){

this.redirect=Boolean.valueOf(redirect);

}

else {

throw new RuntimeException("属性redirect的值必须为true或者false");

//如果属性redirect的值不为true或者false，则抛出RuntimeException异常

}

}

// checkPath()方法用于校验路径是否符合规范，即必须以/开头；

public void checkPath(String path) {

Matcher matcher = pattern.matcher(path); //匹配Action的路径是否符合规范

boolean b = matcher.matches();

if(!b) {

throw new InvalidPathException("ForwardModel.path["+path+"]必须以/开头");

//如果Action的路径不符合规范，则抛出InvalidPathException异常

}

}

}

ConfigModel

public class ConfigModel {

private Map actionMap = new HashMap<>();

//根据指定的路径 path，在 actionMap 中查找对应的 ActionModel 对象并返回。

public ActionModel find(String path) {

if(actionMap.containsKey(path)) {

return actionMap.get(path);

}

else {

throw new RuntimeException("action path:"+path+"没有找到");

}

}

//将指定的 ActionModel 对象存储到 actionMap 中。

public void put(ActionModel action) {

if(!actionMap.containsKey(action.getPath())) {

actionMap.put(action.getPath(), action);

}

else {

//如果该对象的路径已经存在于 actionMap 中，则抛出自定义的 ActionDuplicateDefinitionException 异常，提示路径重复定义。

throw new ActionDuplicateDefinitionException("action path:"+action.getPath()+"重复定义");

}

}

}

ForwardModel     

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(String redirect) {

this.redirect = Boolean.valueOf(redirect);

}

}

ActionNotFoundException

/*

* action找不到指定路径

*/

public class ActionNotFoundException extends RuntimeException{

public ActionNotFoundException() {

super();

}

public ActionNotFoundException(String msg) {

super(msg);

}

public ActionNotFoundException(String msg,Throwable cause) {

super(msg,cause);

}

}

ForwardNotFoundException

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(String redirect) {

this.redirect = Boolean.valueOf(redirect);

}

}

ConfigModelFactory

public class ConfigModelFactory {

//私有化构造方法，确保该类不会被实例化

private ConfigModelFactory() {}

//使用饿汉模式，类加载时就初始化了config对象

private static ConfigModel config = null;

static {

//读取配置文件config.xml

InputStream in = ConfigModelFactory.class.getResourceAsStream("/config.xml");

SAXReader reader = new SAXReader();

Document doc;

try {

doc = reader.read(in);

Element root = doc.getRootElement();

config = new ConfigModel();

//读取每个action节点

List actions = root.selectNodes("action");

for (Element action : actions) {

String actionPath = action.attributeValue("path");

String actionType = action.attributeValue("type");

//创建ActionModel对象

ActionModel actionModel = new ActionModel();

actionModel.setPath(actionPath);

actionModel.setType(actionType);

//读取每个action节点下的forward子节点

List forwards = action.selectNodes("forward");

for (Element forward : forwards) {

String forwardPath = forward.attributeValue("path");

String forwardName = forward.attributeValue("name");

String redirect = forward.attributeValue("redirect");

//创建ForwardModel对象

ForwardModel forwardModel = new ForwardModel();

forwardModel.setPath(forwardPath);

forwardModel.setName(forwardName);

forwardModel.setRedirect(redirect);

//将ForwardModel对象放入ActionModel对象中

actionModel.put(forwardModel);

}

//将ActionModel对象放入ConfigModel对象中

config.put(actionModel);

}

} catch (Exception e) {

//抛出运行时异常

throw new RuntimeException("解析config.xml发生异常", e.getCause());

}

}

//提供一个方法获取config对象

public static ConfigModel getConfigModel() {

return config;

}

public static void main(String[] args) throws DocumentException {

//测试

ActionModel action = config.find("/studentAction");

System.out.println(action.getType());

System.out.println("yes");

}

}

ActionDuplicateDefinitionException

/*

* action重复定义异常

*/

public class ActionDuplicateDefinitionException extends RuntimeException{

public ActionDuplicateDefinitionException() {

super();

}

public ActionDuplicateDefinitionException(String msg) {

super(msg);

}

public ActionDuplicateDefinitionException(String msg,Throwable cause) {

super(msg,cause);

}

}

ForwardDuplicateDefinitionException

/**

* forward重复定义异常

* @author PC

*

*/

public class ForwardDuplicateDefinitionException extends RuntimeException{

public ForwardDuplicateDefinitionException() {

super();

}

public ForwardDuplicateDefinitionException(String msg) {

super(msg);

}

public ForwardDuplicateDefinitionException(String msg,Throwable cause) {

super(msg,cause);

}

InvalidPathException

public class InvalidPathException extends RuntimeException{

public InvalidPathException() {

super();

}

public InvalidPathException(String msg) {

super(msg);

}

public InvalidPathException(String msg,Throwable cause) {

super(msg,cause);

}

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