jsp第九周作业

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 BookPackage;
//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(Super)，1个有参(Fields)
public class Book {
    int id;
    String name;
    double price;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public Book(int id, String name, double price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }


    public Book() {
        super();
        // TODO Auto-generated constructor stub
    }

    @Override
    public String toString() {
        return "Book [id=" + id + ", name=" + name + ", price=" + price + "]";
    }

}

package BookPackage;

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

public class main {

    static ArrayList<Book> booklist=new ArrayList<Book>();
    static Scanner sc=new Scanner(System.in);
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Book book1=new Book(1,"英语",20);
        Book book2=new Book(2,"语文",30);
        Book book3=new Book(3,"数学",40);
        
        booklist.add(book1);
        booklist.add(book2);
        booklist.add(book3);
        
        for (int i = 0; i <booklist.size(); i++) {
            Book b= booklist.get(i);
            System.out.println("图书编号："+b.getId()+"，图书名称："+b.getName()+"，图书价格"+b.getPrice());
        }
        System.out.println("----------------------");
        shouye();

    }
    
    public static void shouye() {
        System.out.println("请输入你需要的选项：");
        System.out.println("1.添加图书");
        System.out.println("2.删除图书");
        System.out.println("3.修改图书");
        System.out.println("4.查询图书");
        System.out.println("----------------------");
        caidan();
    }
    
    public static void caidan() {
        int num=sc.nextInt();
        switch (num) {
        case 1:
            tianjia();
            break;
        case 2:
            shanchu();
            break;
        case 3:
            xiugai();
            break;
        case 4:
            chaxun();
            break;
        default:
            break;
        }
    }

    private static void chaxun() {
        // TODO Auto-generated method stub
        System.out.println("请输入要查询图书名称：");
        String bookname=sc.next();
        for (int i = 0; i < booklist.size(); i++) {
            if(booklist.get(i).getName().equals(bookname)){
                System.out.println("----------------------");
                Book b= booklist.get(i);
                System.out.println("图书编号："+b.getId()+"，图书名称："+b.getName()+"，图书价格"+b.getPrice());
            }
        }
    }

    private static void xiugai() {
        // 修改图书信息
        System.out.println("请输入要修改的图书id：");
        int bookid=sc.nextInt();
        for (int i = 0; i < booklist.size(); i++) {
            if(booklist.get(i).getId()==bookid){
                booklist.remove(i);
                System.out.println("请输入新的图书编号：");
                int id=sc.nextInt();
                System.out.println("请输入新的图书名称：");
                String name=sc.next();
                System.out.println("请输入新的图书价格：");
                double price=sc.nextDouble();
                Book newbook=new Book(id,name,price);
                booklist.add(newbook);
            }
        }
        System.out.println("图书信息修改完成！");
        System.out.println("----------------------");
        mulu();
        shouye();
    }

    private static void shanchu() {
        // 删除图书
        System.out.println("请输入要删除的图书名称：");
        String bookname=sc.next();
        for (int i = 0; i < booklist.size(); i++) {
            if(booklist.get(i).getName().equals(bookname)){
                booklist.remove(i);
            }
        }
        System.out.println("删除成功！");
        System.out.println("----------------------");
        mulu();
        shouye();
    }

    private static void tianjia() {
        //添加图书
        System.out.println("请输入图书编号：");
        int id=sc.nextInt();
        System.out.println("请输入图书名称：");
        String name=sc.next();
        System.out.println("请输入图书价格：");
        double price=sc.nextDouble();
        Book newbook=new Book(id,name,price);
        booklist.add(newbook);
        System.out.println("新图书添加完成！");
        System.out.println("----------------------");
        mulu();
        shouye();
    }

    private static void mulu() {
        // 更新后图书目录
        for (int i = 0; i <booklist.size(); i++) {
            Book b= booklist.get(i);
            System.out.println("图书编号："+b.getId()+"，图书名称："+b.getName()+"，图书价格"+b.getPrice());
        }
        System.out.println("----------------------");
    }
    

}

 

 

 

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。

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%@page import="BookPackage.Book"%>
<html>
  <head>
  </head>
  <body>
图书信息：<br/>
    <%
        ArrayList<Book> booklist=new ArrayList<Book>();
        Book book1=new Book(1,"文言文",20);
        Book book2=new Book(2,"论语", 30);
        Book book3=new Book(3,"散文", 10);
        booklist.add(book1);
        booklist.add(book2);
        booklist.add(book3);
        for (int i = 0; i < booklist.size(); i++) {
            Book b=booklist.get(i);
            int id=b.getId();
            String name=b.getName();
            double price=b.getPrice();
            out.print("图书编号："+id+"，图书名称："+name+"，图书价格为："+price+"<br>");
        }    
    %>
  </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

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