JSP第9次作业

1.

package BookPackage;

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

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(100,"1",20);
        Book book2=new Book(200,"2",30);
        Book book3=new Book(300,"3",10);
        
        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.

<%@ page import="one.Book" %>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'index.jsp' starting page</title>
  </head>
  
  <body>
  <%
  ArrayList<Book> list=new ArrayList<Book>();
  
  Book b1=new Book("1","1",73);
  Book b2=new Book("2","2",40);
  Book b3=new Book("3","3",39);
  
  list.add(b1);
  list.add(b2);
  list.add(b3);
  
   for (int i = 0; i<list.size(); i++) {
            out.print("编号为:"+list.get(i).getId()+"  ,名称为:"
                       +list.get(i).getName()+"  ,价格为:"+list.get(i).getPrice()+"<br>");
        }
   %>
    
  </body>
</html>

3.

在MySQL中创建Book表，里面id,name,price        create table book(
    -> id int(10) auto_increment primary key,
    -> name varchar(50),
    -> price double(5,1));
添加5个图书
insert into Book(id,name,price)values(1,"一",10);
insert into Book(id,name,price)values(2,"二",20);
insert into Book(id,name,price)values(3,"三",30);
insert into Book(id,name,price)values(4,"四",40);
insert into Book(id,name,price)values(5,"五",30);
把20元以上的图书价格都修改为15，
 update book set price=15 where price>20;
查看全部图书
 select * from book;
查看价格高于10块的全部图书
 select * from book where price>10;
把所有名称是“二”开头的图书删除
 delete from book where name like '二%';
删除全部图书
 delete from book;