自定义MVC框架02

一、中央控制器动态加载子控制器信息

二、参数传递封装问题优化

三、方法执行机构转发、重定向优化

四、框架配置文件名修改

自定义MVC存在的问题

基于上次我们所写的自定义MVC框架01时的基础上解决一下问题

基本工作

导入以下类，导入jar包

一、中央控制器动态加载子控制器信息
中央控制器：

package com.lucy.web;

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 javax.servlet.jsp.PageContext;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;

import com.lucy.framework.Action;
import com.lucy.framework.ActionModel;
import com.lucy.framework.ConfigModelFactory;
import com.lucy.framework.ForwardModel;
import com.lucy.framework.ModelDriven;
import com.lucy.framework.configModel;

//@WebServlet("*.action")
public class DispatcherServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;

   private Map actions=new HashMap();


   private configModel configmodel;


//处程序启动会加载一次初始化
   @Override
   public void init() throws ServletException {
//       actions.put("/book", new BookAction());
//       actions.put("/order", new OrderAction());
//       解决这种做法的方法
       try {
//           getInitParameter的作用是拿到web.xml中的servlet的信息配置的参数
           String configLocation =this.getInitParameter("configLocation");//配置地址
           if(configLocation==null||"".equals(configLocation)) {
               configmodel=ConfigModelFactory.bulid();
           }
           else {
               configmodel=ConfigModelFactory.bulid(configLocation);
           }

       } catch (Exception e) {
           e.printStackTrace();
       }

   }

   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
           doPost(request, response);
   }

   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       String url=request.getRequestURI();//http://locatio:8080/mvc/book.action?methodName=list
//           要拿到/book 就是最后一个.为止--截取地址
       url=url.substring(url.lastIndexOf("/"),url.lastIndexOf("."));
//       System.out.println("路径"+url),当前需要config.xml的全路径敏，然后反射实例化
       Action action=actions.get(url);//路径
//       相对于上一种从map集合里获取总控制器，
       ActionModel am=configmodel.pop(url);
       if(am==null) {
           throw new RuntimeException("action 配置有误");
       }
       String type=am.getType();//是action子控制器的全路径名
       try {
           Action action1 =(Action)Class.forName(type).newInstance();
//           action1.execute(request, response);

       } catch (Exception e) {
           e.printStackTrace();
       }

   }

}

子控制器================================================================================================

package com.lucy.framework;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public interface Action {
   void execute(HttpServletRequest request, HttpServletResponse response) ;

}

二、参数传递封装问题优化

Demo.jsp界面代码

参数传递封装问题优化
bid=9898&bname=laoliu&price=123">增加

创建一个实体类---book

package com.lucy.entity;

public class Book {
   private int bid;
   private String bname;
   private float price;
   public int getBid() {
       return bid;
   }
   public void setBid(int bid) {
       this.bid = bid;
   }
   public String getBname() {
       return bname;
   }
   public void setBname(String bname) {
       this.bname = bname;
   }
   public float getPrice() {
       return price;
   }
   public void setPrice(float price) {
       this.price = price;
   }

   public Book() {
       // TODO Auto-generated constructor stub
   }
   public Book(int bid, String bname, float price) {
       this.bid = bid;
       this.bname = bname;
       this.price = price;
   }
   @Override
   public String toString() {
       return "Book [bid=" + bid + ", bname=" + bname + ", price=" + price + "]";
   }
}

package com.lucy.web;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.lucy.entity.Book;
import com.lucy.framework.Action;
import com.lucy.framework.ActionSupport;
import com.lucy.framework.ModelDriven;


public class BookAction extends ActionSupport  implements ModelDriven{
			private Book book=new Book();

	private void load(HttpServletRequest request, HttpServletResponse response) {
		System.out.println("在同一个orderservlet中调用load方法");
	}

	private String list(HttpServletRequest request, HttpServletResponse response) {
			System.out.println("在同一个orderservlet中调用list方法");
			return "success" ;
	}

	private void edit(HttpServletRequest request, HttpServletResponse response) {
		System.out.println("在同一个orderservlet中调用edit方法");
		
	}

	private void del(HttpServletRequest request, HttpServletResponse response) {
		System.out.println("在同一个orderservlet中调用del方法");
		
	}

	private String add(HttpServletRequest request, HttpServletResponse response) {
//		方法1 接收参数
//		String  bid=request.getParameter("bid");
//		String  bname=request.getParameter("bname");
//		String  price=request.getParameter("price");
//		Book book=new Book();
//		book.setBid(Integer.valueOf(bid));
//		book.setBname(bname);
//		book.setPrice(Integer.valueOf(price));
		
		System.out.println("在同一个orderservlet中调用add方法");
		return "failed";
	}
//正式调方法前，book中的属性 要被赋值
	@Override
	public Book getModel() {
		return book;
	}
		
}

package com.lucy.framework;

public interface ModelDriven {

           T getModel();

}

三、方法执行机构转发、重定向优化
子控制器

package com.lucy.framework;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public interface Action {
   String execute(HttpServletRequest request, HttpServletResponse response) ;

}

package com.lucy.web;

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 javax.servlet.jsp.PageContext;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;

import com.lucy.framework.Action;
import com.lucy.framework.ActionModel;
import com.lucy.framework.ConfigModelFactory;
import com.lucy.framework.ForwardModel;
import com.lucy.framework.ModelDriven;
import com.lucy.framework.configModel;

//@WebServlet("*.action")
public class DispatcherServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;
// ?
   private Map actions=new HashMap();


   private configModel configmodel;


//处程序启动会加载一次初始化
   @Override
   public void init() throws ServletException {
//       actions.put("/book", new BookAction());
//       actions.put("/order", new OrderAction());
//       解决这种做法的方法
       try {
//           getInitParameter的作用是拿到web.xml中的servlet的信息配置的参数
           String configLocation =this.getInitParameter("configLocation");//配置地址
           if(configLocation==null||"".equals(configLocation)) {
               configmodel=ConfigModelFactory.bulid();
           }
           else {
               configmodel=ConfigModelFactory.bulid(configLocation);
           }

       } catch (Exception e) {
           e.printStackTrace();
       }

   }

   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
           doPost(request, response);
   }

   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       String url=request.getRequestURI();//http://locatio:8080/mvc/book.action?methodName=list
//           要拿到/book 就是最后一个.为止--截取地址
       url=url.substring(url.lastIndexOf("/"),url.lastIndexOf("."));
//       System.out.println("路径"+url),当前需要config.xml的全路径敏，然后反射实例化
       Action action=actions.get(url);//路径
//       相对于上一种从map集合里获取总控制器，
       ActionModel am=configmodel.pop(url);
//       System.out.println("ActionModel:"+am);//?
       if(am==null) {
           throw new RuntimeException("action 配置有误");
       }
       String type=am.getType();//是action子控制器的全路径名
       try {
           Action action1 =(Action)Class.forName(type).newInstance();

           //action 是bookAction
           if(action instanceof ModelDriven) {
               ModelDriven md=(ModelDriven) action;
           Object   model=md.getModel();
           //要给model里的属性赋值，首先要接收前台jsp的参数，req.getpmap()
//               PropertyUtils.getProperty(, name);//从某一个对象中取一个参数
//           将前台参数封装进实体类
           BeanUtils.populate(model, request.getParameterMap());
           System.out.println(model);

           }
           action1.execute(request, response);

       } catch (Exception e) {
           e.printStackTrace();
       }

   }

}

config.xml类=======================================================================

四、框架配置文件名修改

0624_MVC


mvc
com.lucy.web.DispatcherServlet

configLocation
Lucy



mvc
.action

package com.lucy.web;

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 javax.servlet.jsp.PageContext;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;

import com.lucy.framework.Action;
import com.lucy.framework.ActionModel;
import com.lucy.framework.ConfigModelFactory;
import com.lucy.framework.ForwardModel;
import com.lucy.framework.ModelDriven;
import com.lucy.framework.configModel;

//@WebServlet(".action")
public class DispatcherServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;
// ?
   private Map actions=new HashMap();


   private configModel configmodel;


//处程序启动会加载一次初始化
   @Override
   public void init() throws ServletException {
//       actions.put("/book", new BookAction());
//       actions.put("/order", new OrderAction());
//       解决这种做法的方法
       try {
//           getInitParameter的作用是拿到web.xml中的servlet的信息配置的参数
           String configLocation =this.getInitParameter("configLocation");//配置地址
           if(configLocation==null||"".equals(configLocation)) {
               configmodel=ConfigModelFactory.bulid();
           }
           else {
               configmodel=ConfigModelFactory.bulid(configLocation);
           }

       } catch (Exception e) {
           e.printStackTrace();
       }

   }

   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
           doPost(request, response);
   }

   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       String url=request.getRequestURI();//http://locatio:8080/mvc/book.action?methodName=list
//           要拿到/book 就是最后一个.为止--截取地址
       url=url.substring(url.lastIndexOf("/"),url.lastIndexOf("."));
//       System.out.println("路径"+url),当前需要config.xml的全路径敏，然后反射实例化
       Action action=actions.get(url);//路径
//       相对于上一种从map集合里获取总控制器，
       ActionModel am=configmodel.pop(url);
//       System.out.println("ActionModel:"+am);//?
       if(am==null) {
           throw new RuntimeException("action 配置有误");
       }
       String type=am.getType();//是action子控制器的全路径名
       try {
           Action action1 =(Action)Class.forName(type).newInstance();

           //action 是bookAction
           if(action instanceof ModelDriven) {
               ModelDriven md=(ModelDriven) action;
           Object   model=md.getModel();
           //要给model里的属性赋值，首先要接收前台jsp的参数，req.getpmap()
//               PropertyUtils.getProperty(, name);//从某一个对象中取一个参数
//           将前台参数封装进实体类
           BeanUtils.populate(model, request.getParameterMap());
           System.out.println(model);

           }
//           在正式调用方法前，book的属性要被赋值
           String result=action1.execute(request, response);
           ForwardModel forwardmodel =ActionModel.pop(result);
           if(forwardmodel==null) {
               throw new RuntimeException("forward config error!");
       }
           String path=forwardmodel.getPath();//路径
           request.getRequestDispatcher(path).forward(request, response);//转发
//           拿到是否需要转发的配置
           boolean redirect=forwardmodel.isRedirect();
           if(redirect) {
               response.sendRedirect(request.getServletContext().getContextPath()+path);
           }
           else {
               request.getRequestDispatcher(path).forward(request, response);
           }
//
//           action1.execute(request, response);//

       } catch (Exception e) {
           e.printStackTrace();
       }

   }

}

自定义MVC框架02

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