自定义MVC三

1. 框架

半成品

打jar包

2. 使用自定义mvc框架完成CRUD操作

jsp
action
test
dao
entity
db

3. 增/删/改用重定向,查询用转发

本次目标，完成t_mvc_book表的增删改查
1、通用分页的jar、自定义mvc框架、自定义标签
导入jar、导入之前写好的pageTag、自定义mvc.xml
2、dao层 通用的增删改方法
3、web层
mvc.xml进行配置
4、jsp

导入jar包

　导入之前写好的pageTag

package com.tag;

import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;

import com.util.PageBean;

public class PageTag extends BodyTagSupport {

	private static final long serialVersionUID = -553969530960334073L;

	private PageBean pageBean;

	public PageBean getPageBean() {
		return pageBean;
	}

	public void setPageBean(PageBean pageBean) {
		this.pageBean = pageBean;
	}
	@Override
	public int doStartTag() throws JspException {
		JspWriter out = pageContext.getOut();
		try {
			out.print(toHTML());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return super.doStartTag();

	}

	private String toHTML() {
		// TODO Auto-generated method stub
		StringBuilder sb=new StringBuilder();
		//拼接下一次发送请求所要提交得隐藏得form表单
		sb.append(" <form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'> ");
		sb.append(" <input type='hidden' name='page'> ");
		Map<String, String[]> paMap = pageBean.getPaMap();
		if(paMap!=null&&paMap.size()>0) {
			Set<Entry<String, String[]>> entrySet = paMap.entrySet();
			for (Entry<String, String[]> entry : entrySet) {
				//上一次请求可能携带页码namepage得参数，但是改参数在前面以及单独赋值
				//为什么要单独赋值？因为上一次请求时第一页得数据，下一次可能时第二页，以后这前后请求page对应得值不一样，需要单独赋值
				if(!"page".equals(entry.getKey())) {
//					<input type='hidden' name='hobby' value='1'>
//					<input type='hidden' name='hobby' value='2'>
					//[1,2]
					for(String val:entry.getValue()) {
						sb.append(" <input type='hidden' name='"+entry.getKey()+"' value='"+val+"'> ");
					}
				}
			}
		}


		sb.append(" </form>");
		//拼接分页条
		sb.append(" <div style='text-align: right; font-size: 12px;'> ");
		sb.append(" 每页"+pageBean.getRows()+"条，共"+pageBean.getTotal()+"条，第"+pageBean.getPage()+"页，共"+pageBean.getMaxPage()+"页  <a ");
		sb.append(" href='javascript:gotoPage(1)'>首页</a>  <a");
		sb.append(" href='javascript:gotoPage("+pageBean.getpreviousPage()+")'>上一页</a>  <a");
		sb.append(" href='javascript:gotoPage("+pageBean.getNextPage()+")'>下一页</a>  <a");
		sb.append(" href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a>  <input type='text'");
		sb.append(" id='skipPage'");
		sb.append(" style='text-align: center; font-size: 12px;  50px;'>  <a");
		sb.append(" href='javascript:skipPage()'>Go</a>");
		sb.append(" </div>");
		//拼接分页所需要得js代码
		sb.append(" <script type='text/javascript'>	");
		sb.append(" function gotoPage(page) {");
		sb.append(" document.getElementById('pageBeanForm').page.value = page;");
		sb.append(" document.getElementById('pageBeanForm').submit();");
		sb.append(" }");
		sb.append(" function skipPage() {");
		sb.append(" var page = document.getElementById('skipPage').value;");
		sb.append(" if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>"+pageBean.getMaxPage()+"){");
		sb.append(" alert('请输入1~N的数字');");
		sb.append(" return;");
		sb.append(" }");
		sb.append(" gotoPage(page);");
		sb.append(" }");
		sb.append(" </script>");
	
		
		return sb.toString();
	}



}

　　

　MVC.XML

<?xml version="1.0" encoding="UTF-8"?>
	<!--
		config标签:可以包含0~N个action标签
	-->
<config>
	<!--
		action标签:可以饱含0~N个forward标签
		path:以/开头的字符串,并且值必须唯一 非空
		type:字符串,非空
	-->
	
	<action path="/Cal" type="com.web.CalAction">
		<forward name="res" path="/res.jsp" redirect="false" />
	</action>
	<action path="/book" type="com.web.BookAction">
		<forward name="list" path="/bookList.jsp" redirect="false" />
		<forward name="edit" path="/bookEdit.jsp" redirect="false" />
		<forward name="tolist" path="/book.action?methodName=list" redirect="false" />
		
	</action>
</config>

　　

　2、dao层 通用的增删改方法

　　新建book实体类

package com.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;
	}
	@Override
	public String toString() {
		return "Book [bid=" + bid + ", bname=" + bname + ", price=" + price + "]";
	}
	
}

　　

　在BookDao类增删改查方法

package com.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;

import com.entity.Book;
import com.util.BaseDao;
import com.util.DBAccess;
import com.util.PageBean;
import com.util.StringUtils;

public class Bookdao extends BaseDao<Book>{
    /**
     * 查询所有
     * @param book
     * @param pageBean
     * @return
     * @throws InstantiationException
     * @throws IllegalAccessException
     * @throws SQLException
     */
	public List<Book> list(Book book,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
		String sql="select * from t_mvc_book where true ";
		String bname=book.getBname();
		int bid=book.getBid();
		if(StringUtils.isNotBlank(bname)) {
			sql+=" and bname like '%"+bname+"%'";
		}
		if(bid!=0) {
			sql+=" and bid=" + bid;
		}
		
		return super.executeQuery(sql, Book.class, pageBean);
	}


	/**
	 * 修改方法
	 * @param book
	 * @return
	 * @throws SQLException
	 * @throws NoSuchFieldException
	 * @throws SecurityException
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 */
	public int edit(Book book) throws SQLException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException  {
		String sql="update t_mvc_book set bname=?,price=? where bid=?";
		return super.executeupdate(sql,new String[] {"bname","price","bid"}, book);
	}

	/**
	 * 新增
	 * @param book
	 * @return
	 * @throws SQLException
	 * @throws NoSuchFieldException
	 * @throws SecurityException
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 */
	public int add(Book book) throws SQLException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException  {
		String sql="insert into t_mvc_book values(?,?,?)";
		return super.executeupdate(sql,new String[] {"bid","bname","price"}, book);
	}

	/**
	 * 删除
	 * @param book
	 * @return
	 * @throws SQLException
	 * @throws NoSuchFieldException
	 * @throws SecurityException
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 */
	public int del(Book book) throws SQLException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException  {
		String sql="delete from t_mvc_book where bid=?";
		return super.executeupdate(sql,new String[] {"bid"}, book);

	}
	


	
}

　　

　3、web层

BookAction

package com.web;

import java.sql.SQLException;
import java.util.List;

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

import com.dao.Bookdao;
import com.entity.Book;
import com.framework.ActionSupport;
import com.framework.ModelDrivern;
import com.util.PageBean;

public class BookAction extends ActionSupport implements ModelDrivern<Book>{

	private Book book=new Book();
    private Bookdao bookDao=new Bookdao();
    /**
     * 分页查询
     * @param req
     * @param resp
     * @return
     * @throws InstantiationException
     * @throws IllegalAccessException
     * @throws SQLException
     */
    public String list(HttpServletRequest req,HttpServletResponse resp) {
    	PageBean pageBean=new PageBean();
    	pageBean.setRequest(req);
    	List<Book> list;
		try {
			list = this.bookDao.list(book, pageBean);
			System.out.println(list);
			req.setAttribute("booklist",list);
	    	req.setAttribute("pageBean",pageBean);
		} catch (InstantiationException | IllegalAccessException | SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "list";
    }
    /**
     * 跳转到增加或者修改页面
     * @param req
     * @param resp
     * @return
     * @throws InstantiationException
     * @throws IllegalAccessException
     * @throws SQLException
     */
    public String preSave(HttpServletRequest req,HttpServletResponse resp){
    	//bid的类型是int类型，而int类型的默认值是0,如果jsp为传递bid的参数值，那么bid=0；
    	if(book.getBid()==0) {
    		System.out.println("增加逻辑...");
    	}else {
    		//修改数据回显逻辑 bid=1 book-->list.add(book)-->${book.bname}
    		Book b;
			try {
				b = this.bookDao.list(book, null).get(0);
				req.setAttribute("book", b);
			} catch (InstantiationException | IllegalAccessException | SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    	}
    	//新增页面与修改页面是同一个JSP
		return "edit";
    }
    /**
     * 新增
     * @param req
     * @param resp
     * @return
     * @throws NoSuchFieldException
     * @throws SecurityException
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws SQLException
     */
    public String add(HttpServletRequest req,HttpServletResponse resp) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
    	this.bookDao.add(book);
    	//新增完刷新页面
		return "tolist";
    	
    }
    /**
     * 修改
     * @param req
     * @param resp
     * @return
     * @throws NoSuchFieldException
     * @throws SecurityException
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws SQLException
     */
    public String edit(HttpServletRequest req,HttpServletResponse resp) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
    	this.bookDao.edit(book);
		return "tolist";
    	
    }
    /**
     * 删除
     * @param req
     * @param resp
     * @return
     * @throws NoSuchFieldException
     * @throws SecurityException
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws SQLException
     */
    public String del(HttpServletRequest req,HttpServletResponse resp) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
    	this.bookDao.del(book);
		return "tolist";
    	
    }
	@Override
	public Book getModel() {
		
		return book;
	}

}

　　

　　首页：BookList.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@taglib prefix="z" uri="/jt" %>
<!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>
<h2>小说目录</h2>
	<br>

	<form action="${pageContext.request.contextPath}/book.action?methodName=list"
		method="post">
		书名：<input type="text" name="bname"> <input type="submit"
			value="确定">
	</form>
	<a href="${pageContext.request.contextPath}/book.action?methodName=preSave">增加</a>
	<table border="1" width="100%">
		<tr>
			<td>编号</td>
			<td>名称</td>
			<td>价格</td>
			<td>操作</td>
		</tr>
		<c:forEach items="${booklist }" var="b">
			<tr>
				<td>${b.bid }</td>
				<td>${b.bname }</td>
				<td>${b.price }</td>
				<td>
				    <a href="${pageContext.request.contextPath}/book.action?methodName=preSave&&bid=${b.bid}">修改</a>  
				     <a href="${pageContext.request.contextPath}/book.action?methodName=del&&bid=${b.bid}">删除</a> 
				</td>
			</tr>
		</c:forEach>
	</table>
<z:page pageBean="${pageBean }"></z:page>
</body>
</html>

　　

　修改页面：bookEdit.jsp

<%@ 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>
<form action="${pageContext.request.contextPath}/book.action" method="post">
   <input type="hidden" name="methodName" value="${book.bname == null?'add':'edit' }">
   书籍ID:<input type="text" name="bid" value="${book.bid }"><br>
   书籍名称:<input type="text" name="bname" value="${book.bname }"><br>
   书籍价格:<input type="text" name="price" value="${book.price }"><br>
   <input type="submit">
</form>
</body>
</html>

　　

到这里就写完了！！！