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 one; public class Book { String id; String name; int price; public Book() { super(); } public Book(String id, String name, int price) { super(); this.id = id; this.name = name; this.price = price; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getPrice() { return price; } public void setPrice(int price) { this.price = price; } @Override public String toString() { return "编号是"+id+",书名是"+name+",价格是"+price; } }
package one; import java.util.ArrayList; import java.util.Scanner; public class Test { static ArrayList<Book> list = new ArrayList<Book>(); static Scanner input = new Scanner(System.in); public static void main(String[] args) { // TODO Auto-generated method stub Book b1 = new Book("1", "夜莺与玫瑰", 28); Book b2 = new Book("2", "我的前半生", 50); Book b3 = new Book("3", "狼王宝座", 32); list.add(b1); list.add(b2); list.add(b3); menu(); } public static void menu() { System.out.println("请输入想要实现的功能"); System.out.println("1.添加"); System.out.println("2.删除"); System.out.println("3.查找"); System.out.println("4.修改"); int i = input.nextInt(); switch (i) { case 1: add(); break; case 2: del(); break; case 3: sel(); break; case 4: sel(); break; } } public static void add() { System.out.println("请添加的序号"); String id = input.next(); System.out.println("请添加书名"); String name = input.next(); System.out.println("请输入价格"); int price = input.nextInt(); Book b = new Book(id, name, price); list.add(b); menu(); } public static void del() { System.out.println("请输入要删除的编号"); String id = input.next(); for (int i = 0; i < list.size(); i++) { if (list.get(i).getId().equals(id)) { list.remove(i); } } menu(); } public static void sel() { for (Book b : list) { System.out.println(b); } menu(); } public static void alert() { System.out.println("输入要修改书的编号"); String id = input.next(); for (int i = 0; i < list.size(); i++) { if (list.get(i).getId().equals(id)) { System.out.println("输入新的编号"); String id1 = input.next(); System.out.println("输入新书名"); String name = input.next(); System.out.println("输入新价格"); int price = input.nextInt(); Book b = new Book(id1, name, price); list.set(i, b); System.out.println("修改成功"); break; } menu(); } } }
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="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","DK博物大百科",73); Book b2=new Book("2","哈利·波特与魔法石",40); Book b3=new Book("3","宫西达也恐龙系列",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 database Books; use Books; create table book( id int(20) primary key, name varchar(10) not null, price double );
用命令实现，
添加一个图书，
insert into book values('1','猜猜我有多爱你','40'), ('2','苹果树上的外婆','14'), ('3','我爸爸','21'), ('4','7号梦工厂','70');
根据名称删除图书，
把所有名称是“我”开头的图书删除，
delete from book where name like '我%';
把20元以上的图书价格都修改为18.8，
update book set price=18.8 where price>20;
查看全部图书，
select*from book;
查看价格高于10块钱的全部图书
select*from book where price>10;
删除全部图书，
