自定义MVC02

思维导图

 代码

package com.lzh.web;

import java.io.IOException;
import java.lang.reflect.Field;

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

import entity.Book;
import com.lzh.framework.ActionSupport;
import com.lzh.framework.ModelDriver;

public class BookAction extends ActionSupport implements ModelDriver<Book>{
	private Book book = new Book();
//	execute
	
	private String delete(HttpServletRequest req, HttpServletResponse resp) {
		System.out.println("BookAction调用bookDao.delete()...");
		/*
		 * 需求：删除数据后跳转到书籍展示页面
		 * 缺陷：1.出现大量重复代码	2.不好管理（增删改重新跳转到查询界面）
		 * 解决方案：在一个地方统一管理重定向还是转发，并且是定位跳转到哪一个页面
		 * 预测结果
		 * 	BookAction调用bookDao.delete()...
		 * 	BookAction调用bookDao.list()...
		 * 
		 */
//		try {
//			req.getRequestDispatcher("/bookList.jsp").forward(req, resp);
////			resp.sendRedirect("/bookList.jsp");
//			this.list(req, resp);
//		} catch (Exception e) {
//			e.printStackTrace();
//		}
		return "toList";
	}
	
	private void add(HttpServletRequest req, HttpServletResponse resp) {
		System.out.println("BookAction调用bookDao.add()...");
	}
	
	private String list(HttpServletRequest req, HttpServletResponse resp) {
		System.out.println("BookAction调用bookDao.list()...");
//		try {
//			req.getRequestDispatcher("/bookList.jsp").forward(req, resp);
//		} catch (Exception e) {
//			e.printStackTrace();
//		}
		return "list";
	}
	
	private void ref(HttpServletRequest req, HttpServletResponse resp) {
//		解决参数实体类封装的问题
		/*
		 * 缺陷：对于前端传参，实体类属性值封装req.getParammeter("")代码 是重复的
		 * 需求：做一个book的新增功能
		 * 思考：将JSP参数塞进实体类的属性中，问题是每个实体类的属性是不一样的，没办法做到代码的完全重复
		 * 思路：
		 * 	不知道是哪一个实体类->泛型T
		 * 	不知道这个实体类有哪些属性，但是又要给这些属性赋值->反射动态设置属性值
		 * 解决：泛型+反射
		 * 编码：
		 * 	模型驱动接口：ModelDriver
		 */
//		Book book = new Book();
//		book.setBid(req.getParameter("bid"));
//		book.setBname(req.getParameter("bname"));
//		book.setPrice(req.getParameter("price"));
//		book.setAuthor(req.getParameter("author"));
//		book.setPublish(req.getParameter("publish"));
		System.out.println(book);
		System.out.println("BookAction调用bookDao.ref(book)...");
	}

	@Override
	public Book getModel() {
		return book;
	}
}

package com.lzh.framework;

import java.io.InputStream;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

/**
 * @author Administrator
 *
 */
public class ConfigModelFactory {
	public static ConfigModel build() throws Exception {
		return build("config.xml");
	}

	public static ConfigModel build(String resourcepath) throws Exception {
		InputStream in = ConfigModelFactory.class.getResourceAsStream(resourcepath);
		SAXReader saxReader = new SAXReader();
		Document doc = saxReader.read(in);
		ConfigModel configModel = new ConfigModel();
		List<Element> actionEles = doc.selectNodes("/config/action");
		for (Element actionEle : actionEles) {
			ActionModel actionModel = new ActionModel();
			actionModel.setPath(actionEle.attributeValue("path"));
			actionModel.setType(actionEle.attributeValue("type"));
			List<Element> forwardEles = actionEle.selectNodes("forward");
			for (Element forwardEle : forwardEles) {
				ForwardModel forwardModel = new ForwardModel();
				forwardModel.setName(forwardEle.attributeValue("name"));
				forwardModel.setPath(forwardEle.attributeValue("path"));
				forwardModel.setRedirect(!"false".equals(forwardEle.attributeValue("redirect")));
				actionModel.push(forwardModel );
			}
			configModel.push(actionModel);
		}
		return configModel;
	}
}

运行结果