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
import java.util.*; 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; } }
import java.util.*; 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", "心理罪城市之光", 38); book b2 = new book("2", "看不见的病人", 32); book b3 = new book("3", "哈利波特与魔法石", 51); 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: de(); break; case 3: sel(); break; case 4: alert(); 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 de() { 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"); } 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 language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ page import= "aa.book"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'MyJsp.jsp' starting page</title> </head> <body> <% ArrayList<book> list = new ArrayList<book>(); book b1 = new book("1","心理罪",45); book b2 = new book("2","红楼梦",56); book b3 = new book("3","哑舍",36); list.add(b1); list.add(b2); list.add(b3); for (int i = 0; list != null && i < list.size(); i++) { out.print(list.get(i).getId() + ": " + list.get(i).getName() + " " + list.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5个图书,
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
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。