JSP第九次作业

1.做一个图书类Book id,name,price ,get,set访问器，构造方法2个，1个无参，1个有参做一个测试类，在main中创建3个图书对象，放到list集合中。做一个菜单，可以添加，删除，修改，查询

package entity;

public class Book {
   private   Integer BookId;
    private   String BookName;
   private   Integer BooKPrice;

    public Book() {
    }

    public Book(Integer bookId, String bookName, Integer booKPrice) {
        BookId = bookId;
        BookName = bookName;
        BooKPrice = booKPrice;
    }

    public Integer getBookId() {
        return BookId;
    }

    public void setBookId(Integer bookId) {
        BookId = bookId;
    }

    public String getBookName() {
        return BookName;
    }

    public void setBookName(String bookName) {
        BookName = bookName;
    }

    public Integer getBooKPrice() {
        return BooKPrice;
    }

    public void setBooKPrice(Integer booKPrice) {
        BooKPrice = booKPrice;

    }

    @Override
    public String toString() {
        return "entity.Book{" + "BookId=" + BookId + ", BookName='" + BookName + '\'' + ", BooKPrice=" + BooKPrice + '}';
    }
}

　　

import entity.Book;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class BookTest {
    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        
         for (;;){
                   System.out.println("1.添加,2.修改,3.删除,4.查询,5.退出");
                System.out.println("请输入指令：");
                   int a=input.nextInt();
                     switch (a) {
                         case 1:
                             add();
                             break;
                         case 2:
                             update();
                             break;
                         case 3:
                             del();
                             break;
                         case 4:
                             find();
                             break;
                         case 5:
                             return;
                         default:
                             System.out.println("输入错误");
                             break;
                     }
                 }
             }

    private static void del() {
    }

    private static void update() {
    }

    private static void add() {
    }

    private static void find() {
    }


    public List<Book> getBookList() {
        Book book1=new Book(1,"图书1",20);
        Book book2=new Book(2,"图书2",10);
        Book book3=new Book(3,"图书3",20);
        List<Book> bookList=new ArrayList<Book>();
        bookList.add(book1);
        bookList.add(book2);
        bookList.add(book3);
        return bookList;
    }
}

　　

 

 2.上题的类，在一个JSP页面中，创建一个集合，里面放3个图书，集合循环遍历显示在页面上。

import entity.Book;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.List;

@WebServlet("/show.do")
public class BookServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        BookTest bookTest = new BookTest();
        List<Book> bookList = bookTest.getBookList();
        HttpSession session = request.getSession();
        session.setAttribute("book",bookList);
        session.setAttribute("test1",new String("Session成功"));
        request.setAttribute("bookList",bookList);
        request.setAttribute("test",new String("传值成功"));
        request.getRequestDispatcher("/show.jsp").forward(request,response);
    }
}

　　

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <a href="<%=request.getContextPath()%>/show.do">展示所有图书</a>
</body>
</html>

　　

<%@ page import="java.util.List" %>
<%@page import="entity.Book" %>
<%--
  Created by IntelliJ IDEA.
  User: 86183
  Date: 2022/5/1
  Time: 17:31
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    String test = (String) request.getAttribute("test");
    List<entity.Book> bookList = (List<entity.Book>) request.getAttribute("bookList");
%>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>跳转成功</h1>
<table>
    <tr>
        <th>编号</th>
        <th>书名</th>
        <th>价格</th>
    </tr>
    <%
        for (int i = 0; i < bookList.size(); i++) {

    %>
    <tr>
        <th><%=bookList.get(i).getBookId()%></th>
        <th><%=bookList.get(i).getBookName()%></th>
        <th><%=bookList.get(i).getBooKPrice()%></th>
    </tr>
    <%
        }
    %>

</table>
</body>
</html>

　　

 

3.在MySQL中创建Book表，里面id,name,price,
用命令实现，
添加一个图书，
根据名称删除图书，
把所有名称是“我”开头的图书删除，
删除全部图书，
把20元以上的图书价格都修改为18.8，
查看全部图书，
查看价格高于10块钱的全部图书

 

 

 

posted @ 2022-05-01 20:43  monster丶易  阅读(32)  评论(0)    收藏  举报