升级版MVC增删查改

文章目录

1、第一步准备工作
2、第二步写实体类
3、第三步写dao方法
4、第四步子控制器
5、第五步配置 mvc.xml和web.xml
6、第六步增删改的功能页面展示

1、第一步准备工作

1.1 将自己写好的东西打成jar包，然后加入项目中
1.2 建包，在这里需要五个包，entity,util,dao,tag,web
1.3 导入自己所需要的jar包，和工具类，还有配置文件
下面截图就是我们做好的增删查改准备工作
在这里插入图片描述
注意：. 增/删/改用重定向,查询用转发

2、第二步写实体类

代码如下：

package com.zrh.entity;

public class Book {
	private int bid;
	private String bname;
	private float price;

	@Override
	public String toString() {
		return "Book [bid=" + bid + ", bname=" + bname + ", price=" + 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(int bid, String bname, float price) {
		super();
		this.bid = bid;
		this.bname = bname;
		this.price = price;
	}

	public Book() {
		super();
	}
	
	

}

3、第三步写dao方法

3.1 bookdao继承 BaseDao传一个Book


/**
 * 查询
 * @author zrh
 *
 */
public class BookDao extends BaseDao<Book>{
	public List<Book> list(Book book,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
		String sql = "select * from t_mvc_book where true";
		if(StringUtils.isNotBlank(book.getBname())) {//如果name不是空的就拼进SQL语句中
			sql += " and bname like '%+book.getBname()+%' ";
			
		}
		return super.executeQuery(sql, Book.class, pageBean);
	}
	/**
	 * 增加
	 * @param book
	 * @return
	 * @throws SQLException
	 * @throws IllegalAccessException 
	 * @throws IllegalArgumentException 
	 * @throws SecurityException 
	 * @throws NoSuchFieldException 
	 */
	
	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
	 * @param book
	 * @return
	 * @throws SQLException
	 * @throws NoSuchFieldException
	 * @throws SecurityException
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 */
	
	public int delete(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);
	}
	
	/**
	 * 改
	 * @param book
	 * @return
	 * @throws SQLException
	 * @throws NoSuchFieldException
	 * @throws SecurityException
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 */
	public int update(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);
	}
	

}

3.2 BaseDao.java 把通用的增删改增强


	/**
	 * 通用的增删改方法
	 * @param sql    增删改的sql语句
	 * @param attrs  ？所代表的是实体类的属性
	 * @param t      实体类的实例
	 * @return
	 * @throws SQLException
	 * @throws NoSuchFieldException
	 * @throws SecurityException
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 */
	
	public int executeUpdate(String sql, String[] attrs,T t) throws SQLException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
		Connection con = (Connection) DBAccess.getConnection();
		PreparedStatement pst = con.prepareStatement(sql);
		for (int i = 0; i < attrs.length; i++) {
			Field field = t.getClass().getDeclaredField(attrs[i]);//获取里面的属性对象
			field.setAccessible(true);
			pst.setObject(i+1, field.get(t));;
		}
		return pst.executeUpdate();
	}

3.3 写一个测试类BookDaoTest.java

package com.zrh.dao;


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

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import com.zrh.entity.Book;

class BookDaoTest {
	private BookDao bookDao = new BookDao();
	private Book book = null;
	

	@BeforeEach
	void setUp() throws Exception {
		book = new Book();
	}

	@AfterEach
	void tearDown() throws Exception {
	}

	@Test
	void testList() {
		try {
			List<Book> list = this.bookDao.list(book, null);
			System.out.println(list.size());
		} catch (InstantiationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	@Test
	void testAdd() {
		book.setBid(151);
		book.setBname("斗破");
		book.setPrice(10);
		try {
			this.bookDao.add(book);
		} catch (NoSuchFieldException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	@Test
	void testDelete() {
		book.setBid(151);
		try {
			this.bookDao.delete(book);
		} catch (NoSuchFieldException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	@Test
	void testUpdate() {
		book.setBid(151);
		book.setBname("遮天");
		book.setPrice(102);
		try {
			this.bookDao.update(book);
		} catch (NoSuchFieldException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

以上测试完之后就到了第四步

4、第四步子控制器

package com.zrh.web;

import java.lang.reflect.InvocationTargetException;
import java.sql.SQLException;
import java.util.List;

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

import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriven;
import com.zrh.dao.BookDao;
import com.zrh.entity.Book;
import com.zrh.util.PageBean;
/**
 * 子控制器
 * @author zrh
 *
 */

public class BookAction extends ActionSupport implements ModelDriven<Book>{
	private BookDao bookDao = new BookDao();
	private Book book = new Book();
	/**
	 * 查询分页展示的数据
	 * @param req
	 * @param resp
	 * @return
	 */

	public String list(HttpServletRequest req,HttpServletResponse resp) {
		
		try {
			PageBean pageBean = new PageBean();
			pageBean.setRequest(req);
			List<Book> list = this.bookDao.list(book, pageBean);
			req.setAttribute("bookList", list);
			req.setAttribute("pageBean", pageBean);
			System.out.println(list.size());
		} catch (InstantiationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "list";
	}
	
	/**
	 * 增加书籍
	 * @param req
	 * @param resp
	 * @return
	 */
	public String add(HttpServletRequest req,HttpServletResponse resp) {
		try {
			int rsCode =  this.bookDao.add(book);
		} catch (NoSuchFieldException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "toList";
	}
	
	/**
	 * 删除书籍
	 * @param req
	 * @param resp
	 * @return
	 */
	public String delete(HttpServletRequest req,HttpServletResponse resp) {
		try {
			int rsCode = this.bookDao.delete(book);
		} catch (NoSuchFieldException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "toList";
	}
	
	/**
	 * 加载需要修改的数据
	 * @param req
	 * @param resp
	 * @return
	 */
	public String load(HttpServletRequest req,HttpServletResponse resp) {
		try {
			List<Book> list = this.bookDao.list(book, null);
			req.setAttribute("book", list.get(0));
		} catch (InstantiationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "toEdit";
	}
	
	/**
	 * 开始修改
	 * @param req
	 * @param resp
	 * @return
	 */
	public String update(HttpServletRequest req,HttpServletResponse resp) {
		try {
			int rsCode = this.bookDao.update(book);
		} catch (NoSuchFieldException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "toList";
	}

	@Override
	public Book getModel(HttpServletRequest arg0) throws IllegalAccessException, InvocationTargetException {
		// TODO Auto-generated method stub
		return book;
	}


}

5、第五步配置 mvc.xml和web.xml

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<config>
	<action path="/bookAction" type="com.zrh.web.BookAction">
		 <forward name="list" path="/bookList.jsp" redirect="false" />
		 <forward name="toList" path="bookAction.action?methodName=list" redirect="true" />
		 <forward name="toEdit" path="/bookEdit.jsp" redirect="false" />
	</action>
</config>

web.xml

<?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>T224_mvc_crud</display-name>
 	
 	<!-- 配置中文乱码过滤器 -->
 	<filter>
 		<filter-name>encodingFiter</filter-name>
 		<filter-class>com.zrh.util.EncodingFiter</filter-class>
 	</filter>
 	<filter-mapping>
 		<filter-name>encodingFiter</filter-name>
 		<url-pattern>/*</url-pattern>
 	</filter-mapping>
  
  <!-- 配置Servlet核心控制器 -->
  <servlet>
  	<servlet-name>actionServlet</servlet-name>
  	<servlet-class>com.zking.framework.ActionServlet</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>actionServlet</servlet-name>
  	<url-pattern>*.action</url-pattern>
  </servlet-mapping>
  
  
 
</web-app>

以上五步都是后台的页面，下面我们进入前台的功能实现

6、第六步增删改的功能页面展示

页面我们有主页面，和新增修改页面，我们把新增修改页面放在一起

首先是主页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
 <%--  <%@ taglib uri="/zrh" prefix="z" %> --%>
<!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>
<script type="text/javascript">
	function add(){
		window.location.href = "bookEdit.jsp";
	}
	function update(bid){
		window.location.href = "${pageContext.request.contextPath}/bookAction.action?methodName=load&&bid="+bid;
	}
	function del(bid){
		window.location.href = "${pageContext.request.contextPath}/bookAction.action?methodName=delete&&bid="+bid;
	}
</script>
</head>
<body>
	<form action="${pageContext.request.contextPath}/bookAction.action?methodName=list"
		method="post">
		书名：<input type="text" name="bname"> <input type="submit"
			value="确定">
	</form>
	<button onclick="add();">新增</button>
	<table border="1" width="100%">
		<tr>
			<td>编号</td>
			<td>名称</td>
			<td>价格</td>
			<td>操作</td>
		</tr>
		<c:forEach items="${bookList }" var="b">
			<tr>
				<td>${b.bid }</td>
				<td>${b.bname }</td>
				<td>${b.price }</td>
				<td>
					<button onclick="update(${b.bid });">修改</button>&nbsp;&nbsp;&nbsp;
					<button  onclick="del(${b.bid });return confirm('确定要删除吗')">删除</button>
				</td>
			</tr>
		</c:forEach>
	</table>

	<%-- <z:page pagebean="${pagebean }"></z:page> --%>
</body>
</html>

然后是新增修改页面

<%@ 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>
<script type="text/javascript">
	function doSubmit(bid){
		var bookForm = document.getElementById("bookForm");
		if(bid){
			//修改时执行
			bookForm.action = '${pageContext.request.contextPath}/bookAction.action?methodName=update';
		}else{
			//新增时执行
			bookForm.action = '${pageContext.request.contextPath}/bookAction.action?methodName=add';
		}
		bookForm.submit();
	}
</script>
</head>
<body>
	<form id="bookForm" action="" method="post">
		bid:<input type="text" name="bid" value="${book.bid }"><br>
		bname:<input type="text" name="bname" value="${book.bname }"><br>
		price:<input type="text" name="price" value="${book.price }"><br>
		<input type="submit" value="提交" onclick="doSubmit('${book.bid}');">
	</form>

</body>
</html>

页面展示结果为：
主页面：
在这里插入图片描述
增加页面：

修改页面：
在这里插入图片描述

到这里就结束了！

升级版MVC增删查改

文章目录

1、第一步准备工作

2、第二步写实体类

3、第三步写dao方法

4、第四步 子控制器

5、第五步 配置 mvc.xml和web.xml

6、第六步 增删改的功能页面展示

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4、第四步子控制器

5、第五步配置 mvc.xml和web.xml

6、第六步增删改的功能页面展示