JSP第七次作业

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 Book;


public class Book {
    private int id;
    private String name;
    private double price;
        
    public Book(int id, String name, double price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }
    
    public Book() {
        // TODO Auto-generated constructor stub
    }

    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 void show() {
        System.out.println("ID为" + id);
        System.out.println("书名:" + name);
        System.out.println("价钱:" + price);
      }


    public void print() {
        System.out.println( "ID为"+ id +"书名：" + name  +"\n"+ "价格： " + price +"\n");

        }


}

package Book;

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

public class a {
    static ArrayList<Book> list=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,"Java开发实战经典",10);
            book1.print();
            Book book2 = new Book(2,"名侦探柯南", 6);
            book2.print();
            Book book3 = new Book(3,"锦衣之下", 20);
            book3.print();
            list.add(book1);
            list.add(book2);
            list.add(book3);
         
            
            
            
            
            
            for (int i = 0; i < list.size(); i++) {
                Book b=list.get(i);
                System.out.println("id为"+b.getId()+"\n"+b.getName()+"   ￥价格为"+b.getPrice());
            }
            showmain();
        }
        private static void showmain() {
            // TODO Auto-generated method stub
        
            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("请选择你的操作");
            
            int num=sc.nextInt();
            switch(num){
            case 1:add();break;
            case 2:delete();break;
            case 3:update();break;
            case 4:select();break;
            }
        }

        private static void select() {
            // TODO Auto-generated method stub
            System.out.println("请输入图书id");
            int id=sc.nextInt();
                for (int i = 0; i < list.size(); i++) {
                    if (id == list.get(i).getId()) {
                            System.out.println("查询结果为");
                            Book b1=list.get(i);
                            System.out.println("id为"+b1.getId()+"\n"+b1.getName()+"   ￥价格为"+b1.getPrice());                                                    
                        }
                }
            showmain();
        }


private static void update() {
    // TODO Auto-generated method stub
    System.out.println("请输入图书id");
    int id=sc.nextInt();
    
        for (int i = 0; i < list.size(); i++) {
            if (id == list.get(i).getId()) {
                list.remove(i);
                System.out.println("请输入图书name");
                String name=sc.next();
                System.out.println("请输入图书price");
                int price=sc.nextInt();
                Book b=new Book(id,"name",price);
                b.setId(id);
                b.setName(name);
                b.setPrice(price);
                list.add(b);
                System.out.print("操作成功为");
                f();
            
            }
        }
         showmain();
}

private static void delete() {
    // TODO Auto-generated method stub
    System.out.println("请输入图书id");
    int id=sc.nextInt();
        for (int i = 0; i < list.size(); i++) {
            if (id == list.get(i).getId()) {
                list.remove(i);
                System.out.println("删除成功");
                }
        }
        f();
    showmain();
}

private static void add() {
    // TODO Auto-generated method stub
    System.out.println("请输入图书id");
    int id=sc.nextInt();
    System.out.println("请输入图书name");
    System.out.println("请输入图书price");
    int price=sc.nextInt();
    Book b=new Book(id,"name",price);
    list.add(b);
    f();
    showmain();
}

private static void f() {
    System.out.println("图书列表最新版本为");
    for (int i = 0; i < list.size(); i++) {
        Book b1=list.get(i);
        System.out.println("id为"+b1.getId()+"\n"+b1.getName()+"￥价格为"+b1.getPrice());
    }
}
}

 

 

 

 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 import="Book.Book"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head></head>
  
  <body>

<%

        ArrayList<Book> list=new ArrayList<Book>();
        Book book1=new Book(1,"Java开发实战经典",10);
        Book book2=new Book(2,"名侦探柯南", 6);
        Book book3=new Book(3,"锦衣之下", 20);
        
        list.add(book1);
        list.add(book2);
        list.add(book3);
        for (int i = 0; i < list.size(); i++) {
            Book b=list.get(i);
            int id=b.getId();
            String name=b.getName();
            double price=b.getPrice();
            out.print("ID为"+id+"<br>"+"书名为："+name+"、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

 

INSERT INTO book VALUES (4,"我和我的祖国",16.6)
INSERT INTO book VALUES (5,"柯南道尔",15.5)
DELETE FROM book WHERE name LIKE '我%'
UPDATE book SET price=18.8 WHERE price>20
SELECT * FROM book
DELETE FROM book