在前面两期博客中我们了解了关于自定义MVC框架对之前代码的一些优化原理，今天我给大家带来的是自定义MVC框架的综合运用（增删改查），
下面由我来给大家分享（跟着我们的思维导图一起了解一下）
链接：https://pan.baidu.com/s/1vHTem1HD1CEdjGTmJuPAFQ
提取码：yx04
该链接将本次分享所需的文件包含在内了，有需要课前往下载
如图所示
（由于代码过多，如图所示）
右击scr新建一个Source Folder文件夹，在此文件夹中新建一个.xml文件
（如图所示）
<?xml version="1.0" encoding="UTF-8"?>
<config>
<!--
在这里每加一个配置，就相当于actions.put("/goods", new GoodsAction());
这样就解决了代码灵活性的问题
-->
<action path="/book" type="com.YX.Web.BookAction">
<!-- 查询：BookList.jsp 返回值：list -->
<!-- * 增删改确定：book.action?methodName=list 返回值：toList -->
<!-- * 增加修改跳转对应界面：bookEdit.jsp 返回值：toEdit -->
<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>
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>YX_MVC_project</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>mvc</servlet-name>
<servlet-class>com.zking.framework.DispatchServlet</servlet-class>
<init-param>
<param-name>configurationLocation</param-name>
<param-value>/mvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>mvc</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
</web-app>
package com.YX.entity;
/**实体类：书籍类
* @author 君易--鑨
* 2023年7月3日下午10:00:37
*
*/
public class Book {
//定义属性
private int bid;
private String bname;
private float price;
// 获取属性对应的get和set方法
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;
}
/**
* 无参构造
*/
public Book() {
// TODO Auto-generated constructor stub
}
/**
* 有参构造
* @param bid
* @param bname
* @param price
*/
public Book(int bid, String bname, float price) {
super();
this.bid = bid;
this.bname = bname;
this.price = price;
}
@Override
public String toString() {
return "Book [bid=" + bid + ", bname=" + bname + ", price=" + price + "]";
}
}
package com.YX.Dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;
import com.YX.entity.Book;
import com.YX.until.BaseDao;
import com.YX.until.DBAccess;
import com.YX.until.PageBean;
import com.YX.until.StringUtils;
/**
* 数据库方法类
*
* @author 君易--鑨 2023年7月3日下午10:04:40
*
*/
public class BookDao extends BaseDao<Book> {
/**
* 查询的方法
*
* @param book
* 带有查询内容的实体对象
* @param pageBean
* 分页工具类
* @return
* @throws Exception
*/
public List<Book> list(Book book, PageBean pageBean) throws Exception {
String sql = "select * from t_mvc_book where 1=1 ";
// 获取查询的书名
String bname = book.getBname();
// 获取书籍id
int bid = book.getBid();
if (StringUtils.isNotBlank(bname)) {// 判断查询的书名不为空
sql += " and bname like '%" + bname + "%'";
}
if (bid != 0) {// 判断id不等于0，说明传了id过来
sql += " and bid = " + bid;
}
return super.executeQuery(sql, Book.class, pageBean);
}
/**
* 新增的方法
*
* @param book
* 新增的实体对象
* @return
* @throws Exception
*/
public int add(Book book) throws Exception {
// 编写sql语句
String sql = "insert into t_mvc_book values (?,?,?)";
return super.executeUpdate(sql, book, new String[] { "bid", "bname", "price" });
}
/**
* 删除的方法
*
* @param book
* 指定信息
* @return
* @throws Exception
*/
public int del(Book book) throws Exception {
// 编写sql语句
String sql = "delete from t_mvc_book where bid = ?";
return super.executeUpdate(sql, book, new String[] { "bid" });
}
public int edit(Book book) throws Exception {
// 编写sql语句
String sql = "update t_mvc_book set bname = ?,price = ? where bid = ?";
return super.executeUpdate(sql, book, new String[] { "bname", "price", "bid" });
}
}
package com.YX.Dao;
import static org.junit.Assert.*;
import java.util.List;
import org.junit.Test;
import com.YX.entity.Book;
import com.YX.until.PageBean;
/**junit测试类用于测试方法
* @author 君易--鑨
* 2023年7月3日下午10:35:14
*
*/
public class BookDaoTest {
// 实例化Dao方法
private BookDao bookdao=new BookDao();
@Test
public void testList() {
// 实例化实体对象
Book book =new Book();
book.setBname("君易");//设置查询的内容
PageBean pageBean=new PageBean();
// pageBean.setPage();//设置查询第几页
pageBean.setPagination(false);//设置分页
try {
List<Book> list = bookdao.list(book, pageBean);
for (Book b : list) {
System.out.println(b);
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Test
public void testAdd() {
// 实例化实体对象
Book book =new Book();
// 设置要新增的书籍
book.setBid(52);
book.setBname("君易--鑨");
book.setPrice(52);
// 调用方法
try {
bookdao.add(book);
} catch (Exception e) {
e.printStackTrace();
}
}
@Test
public void testDel() {
// 实例化实体对象
Book book =new Book();
// 设置要删除的书籍
book.setBid(52);
// 调用方法
try {
bookdao.del(book);
} catch (Exception e) {
e.printStackTrace();
}
}
@Test
public void testEdit() {
// 实例化实体对象
Book book =new Book(50,"君易--鑨",520);
// 调用方法
try {
bookdao.edit(book);
} catch (Exception e) {
e.printStackTrace();
}
}
}
package com.YX.Web;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.YX.Dao.BookDao;
import com.YX.entity.Book;
import com.YX.until.PageBean;
import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriver;
/**
*
* @author 君易--鑨 2023年7月3日下午11:38:40
*
*/
public class BookAction extends ActionSupport implements ModelDriver<Book> {
private Book book = new Book();// 实例化实体对象
private BookDao bookdao = new BookDao();// 实例化dao方法
// 查询 bookList.jsp
public String list(HttpServletRequest req, HttpServletResponse resp) {
PageBean pageBean = new PageBean();// 实例化分页工具类
pageBean.setRequest(req);// 初始化分页工具
try {
List<Book> lst = bookdao.list(book, pageBean);// 调用方法
// 存储起来回显到界面上
req.setAttribute("lst", lst);
req.setAttribute("pageBean", pageBean);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "list";
}
// 编辑页面跳转 bookEdit.jsp
public String toEdit(HttpServletRequest req, HttpServletResponse resp) {
try {
if (book.getBid() != 0) {
List<Book> lst = bookdao.list(book, null);// 调用方法
// 存储起来回显到界面上
req.setAttribute("b", lst.get(0));
}
} catch (Exception e) {
e.printStackTrace();
}
return "toEdit";
}
// 增加
public String add(HttpServletRequest req, HttpServletResponse resp) {
try {
bookdao.add(book);// 调用方法
} catch (Exception e) {
e.printStackTrace();
}
return "toList";
}
// 删除
public String del(HttpServletRequest req, HttpServletResponse resp) {
try {
bookdao.del(book);// 调用方法
} catch (Exception e) {
e.printStackTrace();
}
return "toList";
}
// 修改
public String edit(HttpServletRequest req, HttpServletResponse resp) {
try {
bookdao.edit(book);// 调用方法
} catch (Exception e) {
e.printStackTrace();
}
return "toList";
}
@Override
public Book getModel() {
// TODO Auto-generated method stub
return book;
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="/YX" prefix="yx"%>
<%@ 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 bg-success">
<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="${lst }">
<tr>
<td>${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 -->
<yx:page pageBean="${pageBean }"></yx:page>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="/YX" prefix="yx"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link
href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.css"
rel="stylesheet">
<script
src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.js"></script>
<title>书籍列表</title>
<style type="text/css">
.page-item input {
padding: 0;
width: 40px;
height: 100%;
text-align: center;
margin: 0 6px;
}
.page-item input, .page-item b {
line-height: 38px;
float: left;
font-weight: 400;
}
.page-item.go-input {
margin: 0 10px;
}
</style>
</head>
<body>
<form class="form-inline"
action="${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="${pageContext.request.contextPath }/book.action?methodName=toEdit">新增</a>
</form>
<table class="table table-striped bg-success">
<thead>
<tr>
<th scope="col">书籍ID</th>
<th scope="col">书籍名</th>
<th scope="col">价格</th>
<th scope="col">操作</th>
</tr>
</thead>
<tbody>
<c:forEach var="b" items="${lst }">
<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=${b.bid}">删除</a>
</td>
</tr>
</c:forEach>
</tbody>
</table>
<!-- 这一行代码就相当于前面分页需求前端的几十行了 -->
<yx:page pageBean="${pageBean }"></yx:page>
</body>
</html>
这期博客给大家分享到这，希望大家能点击关注，后续会继续分享知识。