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 sch; public class Book { private String id; private String name; private double 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 double getPrice() { return price; } public void setPrice(double price) { this.price = price; } public Book(String id, String name, double price) { super(); this.id = id; this.name = name; this.price = price; } public Book(){ super(); } }
package sch; import java.util.ArrayList; import java.util.List; import java.util.Scanner; public class Book2 { static List<Book> listbooks = new ArrayList<Book>(); /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub creatBookList(); menu(); } public static void creatBookList() { // TODO Auto-generated method stub Book b1 = new Book("001", "《软件测试基础》",30); listbooks.add(b1); Book b2 = new Book("002", "《Java基础教程》", 50); listbooks.add(b2); Book b3 = new Book("003", "《微机原理与接口技术》", 60); listbooks.add(b3); } public static void menu() { for (;;) { System.out.println("1.添加图书 "); System.out.println("2.修改图书 "); System.out.println("3.删除图书 "); System.out.println("4.查询图书 "); System.out.println("5.退出程序 "); int i = inputInt("请选择你的操作:"); switch (i) { case 1: addBook(); break; case 2: updateBook(); break; case 3: delBook(); break; case 4: findBook(); break; case 5: return; default: System.out.println("输入错误,请重新输入"); break; } } } private static void findBook() { // TODO Auto-generated method stub System.out.println("id 图书名称 图书价格"); for (Book book : listbooks) { System.out.println(book.getId() + " " + book.getName() + " " + book.getPrice()); } } private static void delBook() { // TODO Auto-generated method stub String id = inputStr("请输入要删除图书的id"); for (int i = 0; i < listbooks.size(); i++) { Book book = listbooks.get(i); if (id.equals(book.getId())) { listbooks.remove(i); } } } private static void updateBook() { // TODO Auto-generated method stub String id = inputStr("请输入要修改的图书id"); for (int i = 0; i < listbooks.size(); i++) { Book book = listbooks.get(i); if (id.equals(book.getId())) { book.setName(inputStr("请输入修改后的图书名称：")); book.setPrice(inputDouble("请输入修改后的图书价格")); listbooks.remove(i); listbooks.add(i, book); } } } private static void addBook() { // TODO Auto-generated method stub String id = inputStr("请输入要添加的图书id"); String name = inputStr("请输入要添加的图书名称"); double price = inputDouble("请输入要添加的图书价格"); Book book = new Book(id, name, price); listbooks.add(book); } public static String inputStr(String msg) { System.out.print(msg); return new Scanner(System.in).nextLine(); } public static int inputInt(String msg) { System.out.print(msg); return new Scanner(System.in).nextInt(); } public static double inputDouble(String msg) { System.out.print(msg); return new Scanner(System.in).nextDouble(); } }
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"%> <%@ page import="sch.Book"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> </head> <body> <% List<Book> listbooks = new ArrayList<Book>(); Book b1 = new Book("001", "《软件测试基础》",30); listbooks.add(b1); Book b2 = new Book("002", "《Java基础教程》", 50); listbooks.add(b2); Book b3 = new Book("003", "《微机原理与接口技术》", 60); listbooks.add(b3); for (int i = 0; listbooks != null && i < listbooks.size(); i++) { out.print(listbooks.get(i).getId() + ": " + listbooks.get(i).getName() + " " + listbooks.get(i).getPrice() + "<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
create database books;
use books;
create table book(
id int(10),
name varchar(10),
price float
);
insert into book values('1','我我我我我我我','01.11');
insert into book values('2','book2','22.22');
update book set price=18.8 where price>20;
select * from book;
select * from book where price>10;
delete from book where name like '我%';
delete from book;
