[开发测试]自定义MVC

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2.MVC

什么是mvc
Model模型，View视图，controller控制层

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?3.运行原理

4.代码演示

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package com.lia.framework;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.lia.web.BookAction;
/**
 * 目标：
 * 根据自定义mvc框架的原理图完成	框架的研发
 * @author zjjt
 *中央控制器
 *寻找子控制器
 */
@WebServlet("*.action")
public class DispatchServlet extends HttpServlet{
	
	//放子控制器的容器
	private Map<String, ActionSupport> actions=new HashMap<String, ActionSupport>();
	//初始化子控制器容器（集合）,经过初始化，actions容器内存就有了子控制器
	//init,service,destroy
	
	@Override
	public void init() throws ServletException {
		actions.put("/book", new BookAction());
		/*actions.put("/order", new BookAction());
		actions.put("/OrderItem", new BookAction());*/
	}
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doPost(req, resp);
	}
	

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		//完成寻找子控制的过程
		//浏览器：http://localhost:8080/t266_mvc/book.action?methodName=add
		//目标：BookAction.add()..
		/**
		 * 思路：
		 * 1.从游览器URL中获取到“/book”字符串
		 * 2.在子控制器容器中拿到BookAction
		 * 3.BookAction.add()
		 */
		String uri = req.getRequestURI();
		uri = uri.substring(uri.lastIndexOf("/"),uri.lastIndexOf("."));
		//action=BookAction
		ActionSupport action = actions.get(uri);
		//ActionSupport action=new BookAction()
		action.execute(req, resp);
	}
}