思维导图（如下）
?代码:
book:
package com.djj.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 + "]";
}
}
bookdao:
package com.djjdao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;
import com.djj.entity.Book;
import com.djj.util.BaseDao;
import com.djj.util.DBAccess;
import com.djj.util.PageBean;
import com.djj.util.StringUtils;
public class BookDao extends BaseDao<Book>{
/**
* 现状：增删改
* 1.写sql
* 2.建立链接
* 3.预定义对象PreparedStatement
* 4.设置参数
* 5.执行sql
* 解决：
*
* @param book
* @throws Exception
*/
public void add(Book book) throws Exception {
String sql = "insert into t_mvc_book values(?,?,?)";
super.executeUpdate(sql, book, new String[] {"bid","bname","price"});
}
public void delete(Book book) throws Exception {
String sql = "delete from t_mvc_book where bid = ?";
super.executeUpdate(sql, book, new String[] {"bid"});
}
public void edit(Book book) throws Exception {
String sql = "update t_mvc_book set bname = ?,price = ? where bid = ?";
super.executeUpdate(sql, book, new String[] {"bname","price","bid"});
}
public List<Book> list(Book book,PageBean pageBean) throws Exception {
String sql = "select * from t_mvc_book where 1=1 ";
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);
}
public static void main(String[] args) throws Exception {
Book book = new Book();
book.setBid(23224);
// book.setBname("23225");
// book.setPrice(23225f);
BookDao bookDao = new BookDao();
// bookDao.add(book);
// bookDao.edit(book);
bookDao.delete(book);
}
}
BookAction:
package com.djj.web;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.djj.entity.Book;
import com.djj.util.PageBean;
import com.djjdao.BookDao;
import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriver;
public class BookAction extends ActionSupport implements ModelDriver<Book>{
private Book book = new Book();
private BookDao bookDao = new BookDao();
@Override
public Book getModel() {
return book;
}
public String add(HttpServletRequest req, HttpServletResponse resp) {
try {
bookDao.add(book);
} catch (Exception e) {
e.printStackTrace();
}
return "toList";
}
public String delete(HttpServletRequest req, HttpServletResponse resp) {
try {
bookDao.delete(book);
} catch (Exception e) {
e.printStackTrace();
}
return "toList";
}
public String edit(HttpServletRequest req, HttpServletResponse resp) {
try {
bookDao.edit(book);
} catch (Exception e) {
e.printStackTrace();
}
return "toList";
}
public String list(HttpServletRequest req, HttpServletResponse resp) {
PageBean pageBean = new PageBean();
pageBean.setRequest(req);
try {
List<Book> list = bookDao.list(book, pageBean);
req.setAttribute("books", list);
req.setAttribute("pageBean", pageBean);
} catch (Exception e) {
e.printStackTrace();
}
return "list";
}
public String toEdit(HttpServletRequest req, HttpServletResponse resp) {
// 如果跳转的是新增界面无需查询，如果跳转的是修改界面，需要查询当前bid对应的数据，回显到界面
if(book.getBid() != 0) {
try {
// bid=16
List<Book> list = bookDao.list(book, null);
req.setAttribute("b", list.get(0));
} catch (Exception e) {
e.printStackTrace();
}
}
return "toEdit";
}
}
booklist.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://jsp.veryedu.cn" prefix="z"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!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">
<link
href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.css"
rel="stylesheet">
<script
src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.js"></script>
<title>书籍列表</title>
<style type="text/css">
.page-item input {
padding: 0;
width: 40px;
height: 100%;
text-align: center;
margin: 0 6px;
}
.page-item input, .page-item b {
line-height: 38px;
float: left;
font-weight: 400;
}
.page-item.go-input {
margin: 0 10px;
}
</style>
</head>
<body>
<form class="form-inline"
action="${pageContext.request.contextPath }/book.action?methodName=list" method="post">
<div class="form-group mb-2">
<input type="text" class="form-control-plaintext" name="bname"
placeholder="请输入书籍名称">
<!-- <input name="rows" value="20" type="hidden"> -->
<!-- 不想分页 -->
<input name="pagination" value="false" type="hidden">
</div>
<button type="submit" class="btn btn-primary mb-2">查询</button>
<a class="btn btn-primary mb-2" href="${pageContext.request.contextPath }/book.action?methodName=toEdit">新增</a>
</form>
<table class="table table-striped">
<thead>
<tr>
<th scope="col">书籍ID</th>
<th scope="col">书籍名</th>
<th scope="col">价格</th>
<th scope="col">操作</th>
</tr>
</thead>
<tbody>
<c:forEach var="b" items="${books }">
<tr>
<td>${b.bid }</td>
<td>${b.bname }</td>
<td>${b.price }</td>
<td>
<a href="${pageContext.request.contextPath }/book.action?methodName=toEdit&bid=${b.bid}">修改</a>
<a href="${pageContext.request.contextPath }/book.action?methodName=delete&bid=${b.bid}">删除</a>
</td>
</tr>
</c:forEach>
</tbody>
</table>
<!-- 这一行代码就相当于前面分页需求前端的几十行了 -->
<z:page pageBean="${pageBean }"></z:page>
</body>
</html>?配置mvc.xml：
<?xml version="1.0" encoding="UTF-8"?>
<config>
<action path="/book" type="com.djj.web.BookAction">
<forward name="list" path="/bookList.jsp" redirect="false" />
<forward name="toList" path="/book.action?methodName=list" redirect="true" />
<forward name="toEdit" path="/bookEdit.jsp" redirect="false" />
</action>
</config>?运行结果:
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