一个简单的MVC框架的实现

时间：2023-03-09 16:35:57
一个简单的MVC框架的实现

1、Action接口

package com.togogo.webtoservice;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public interface Action {

    /**

     * 默认的执行方法

     * @param request 传入处理的请求对象

     * @param response 传入处理的响应对象

     * @return 返回一个跳转的路径

     */

    public String execute(HttpServletRequest request,

            HttpServletResponse response);

}

2、BaseAction的父类

package com.togogo.webtoservice;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public abstract class BaseAction implements Action {

    @Override

    public String execute(HttpServletRequest request,

            HttpServletResponse response) {

        String result = null;

        String uri = request.getRequestURI();

        StringBuilder sb = new StringBuilder(uri);

        String path = sb.substring(uri.lastIndexOf("!") + 1,

                uri.lastIndexOf("."));

        // 已知，方法与uri的参数的字符串，一样的，那么有没有方法，可以通过方法名（字符串）直接调用方法？

        // 实现通过方法名，直接调用方法，就类动态技术

        try {

            Method method = this.getClass().getDeclaredMethod(path,

                    HttpServletRequest.class, HttpServletResponse.class);

            result = (String) method.invoke(this, request, response);

        } catch (NoSuchMethodException e) {

            e.printStackTrace();

        } catch (SecurityException e) {

            e.printStackTrace();

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        } catch (IllegalArgumentException e) {

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            e.printStackTrace();

        }

        return result;

    }

}

3、配置类

package com.togogo.webtoservice;

import java.util.HashMap;

import java.util.Map;

import java.util.ResourceBundle;

/**

 * 路径与类名映身

 *

 * @author Administrator

 *

 */

public class Config {

    // private static Map<String, String> classNames = new HashMap<String,

    // String>();

    /**

     * 通过key

     *

     * @param key

     * @return

     */

    public static String getClassName(String key, String config) {

        ResourceBundle bundle = null;

        if (config == null||"".equals(config)) {

            bundle = ResourceBundle.getBundle("Action");

        } else {

            bundle = ResourceBundle.getBundle(config);

        }

        return bundle.getString(key);

    }

    // static {

    // classNames.put("/user", "com.togogo.action.UserAction");

    // classNames.put("/admin", "com.togogo.action.AdminAction");

    // }

    public static void main(String[] args) {

        // 用于以类的形式来读取properties对象

        ResourceBundle bundle = ResourceBundle

                .getBundle("com.togogo.webtoservice.Action");

        System.out.println(bundle.getString("user"));

    }

}

4、DispacherServlet 类

package com.togogo.webtoservice;

import java.io.IOException;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class DispacherServlet extends HttpServlet {

    private static String config=null;

    private static String enconding="UTF-8";

    @Override

    public void init(ServletConfig config) throws ServletException {

        String initConfig=config.getInitParameter("config");

        String initEnconding=config.getInitParameter("enconding");

        if(initConfig!=null){

            DispacherServlet.config=initConfig;

        }

        //通过web描述符文件web.xml配置

        if(initEnconding!=null){

            DispacherServlet.enconding=initEnconding;

        }

        super.init(config);

    }

    /**

     * 接收任何请求,

     */

    @Override

    protected void service(HttpServletRequest request,

            HttpServletResponse response) throws ServletException, IOException {

        try {

            request.setCharacterEncoding(enconding);

            response.setCharacterEncoding(enconding);

            String uri = request.getRequestURI();

            StringBuilder sb = new StringBuilder(uri);

            String path = sb.substring(uri.lastIndexOf("/") + 1,

                    uri.lastIndexOf("!"));

            System.out.println(path);

            String className = Config.getClassName(path,config);

            Action action = ActionFactory.create(className);

            String result = action.execute(request, response);

            if (result.contains(":")) {

                StringBuilder resultStr = new StringBuilder(result);

                String rePath=resultStr.substring(result.indexOf(":")+1, result.length());

                if(result.contains("redirect:")){

                    response.sendRedirect(rePath);

                }else if(result.contains("forward:")){

                    request.getRequestDispatcher(rePath).forward(request, response);

                }

            } else {

                request.getRequestDispatcher(result).forward(request, response);

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

5、Action工厂类

package com.togogo.webtoservice;

public class Factory {

public static Action create(String className) {

Action action = null;

try {

action = (Action) Class.forName(className).newInstance();

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (InstantiationException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

}

return action;

}

}

6、测试TestAction类

package com.togogo.action;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.togogo.webtoservice.BaseAction;

public class UserAction extends BaseAction {

    /**

     * 用户登录

     *

     * @param request

     * @param response

     * @return

     */

    public String login(HttpServletRequest request, HttpServletResponse response) {

        System.out.println("我在登录");

        System.out.println("我在------登录..");

        return "main.jsp";

    }

    /**

     * 用户注册

     *

     * @param request

     * @param response

     * @return

     */

    public String register(HttpServletRequest request,

            HttpServletResponse response) {

        System.out.println("我在注册");

        return "forward:main.jsp";

    }

    /**

     * 用户注册

     *

     * @param request

     * @param response

     * @return

     */

    public String undo(HttpServletRequest request,

            HttpServletResponse response) {

        System.out.println("我在撤消");

        return "redirect:main.jsp";

    }

}

Action.properties映射文件

user=com.togogo.action.UserAction

web.xml配置

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xmlns="http://java.sun.com/xml/ns/javaee"

	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

	id="WebApp_ID" version="3.0">

	<display-name>web_mvc_webtoservice</display-name>

   <!-- 这是一个核心控制器 -->

	<servlet>

		<servlet-name>dispacherServlet</servlet-name>

		<servlet-class>com.togogo.webtoservice.DispacherServlet</servlet-class>

		<init-param>

		  <param-name>config</param-name>

		  <param-value>com.togogo.action.Action</param-value>

		</init-param>

	</servlet>

	<servlet-mapping>

		<servlet-name>dispacherServlet</servlet-name>

		<url-pattern>*.do</url-pattern>

	</servlet-mapping>

	<welcome-file-list>

		<welcome-file>default.jsp</welcome-file>

	</welcome-file-list>

</web-app>

　　

测试页面

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<a></a>

  <form action="${pageContext.request.contextPath }/user!register.do" method="post">

<!--      <input name="clasName" value="com.togogo.action.UserAction"> -->

     <input type="submit">

  </form>

</body>

</html>

源码下载：

http://files.cnblogs.com/files/zhuyuejiu/web_mvc_webtoserive.zip

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