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 housework; public class Book { private String id; private String name; private double price; //生成getters和setters 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; } //有参构造 public Book(String id, String name, double price) { super(); this.id = id; this.name = name; this.price = price; } //无参构造 public Book() { super(); } }
package housework; import java.util.ArrayList; import java.util.List; import java.util.Scanner; import com.sun.org.apache.bcel.internal.generic.Select; public class test { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub List<Book> list = new ArrayList<Book>(); Book book = new Book(); Book book1 = new Book("001", "jsp实用教程", 45.88); Book book2 = new Book("002", "C程序设计", 59.80); Book book3 = new Book("003", "软件测试技术", 52.60); list.add(book1); list.add(book2); list.add(book3); show(list, book); } public static void show(List<Book> list, Book book) { System.out.println("1.添加图书"); System.out.println("2.查询图书"); System.out.println("3.修改图书"); System.out.println("4.删除图书"); System.out.println("请选择你想要的操作"); System.out.println("========================"); select(list, book); } public static void select(List<Book> list, Book book) { int i = new Scanner(System.in).nextInt(); switch (i) { case 1: System.out.println("请输入添加的图书编号"); book.setId(new Scanner(System.in).next()); System.out.println("请输入添加的图书名称"); book.setName(new Scanner(System.in).next()); System.out.println("请输入添加的图书价格"); book.setPrice(new Scanner(System.in).nextDouble()); list.add(book); System.out.println("添加成功"); System.out.println("========================"); show(list, book); break; case 2: for (int a = 0; list != null && a < list.size(); a++) { System.out.println(list.get(a).getId() + "." + list.get(a).getName() + "," + list.get(a).getPrice()); } show(list, book); break; case 3: System.out.println("请输入要修改图书的编号"); String q = new Scanner(System.in).next(); for (int a = 0; list != null && a < list.size(); a++) { if (list.get(a).getId().equals(q)) { list.remove(a); System.out.println("请输入要修改图书名称"); String n1 = new Scanner(System.in).next(); System.out.println("请输入要修改图书价格"); double p1 = new Scanner(System.in).nextDouble(); Book b = new Book(q, n1, p1); list.add(b); break; } } System.out.println("修改成功"); System.out.println("========================"); show(list, book); break; case 4: System.out.println("请输入要删除图书的名称"); String name = new Scanner(System.in).next(); for (int a = 0; list != null && a < list.size(); a++) { if (list.get(a).getName().equals(name)) { list.remove(a); } } System.out.println("删除成功"); System.out.println("========================"); show(list, book); break; } } }
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="housework.Book"%> <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> </head> <body> <% List<Book> list = new ArrayList<Book>(); Book book = new Book(); Book book1 = new Book("001", "jsp实用教程", 45.88); Book book2 = new Book("002", "C程序设计", 59.80); Book book3 = new Book("003", "软件测试技术", 52.60); list.add(book1); list.add(book2); list.add(book3); 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 table Book(id int(10),name char(10),price double(10)); insert into Book(id,name,price)values(001,"jsp教程",88); delete from Book where name='java'; delete from Book where name like '我%'; delete from Book; update Book set price=18.8 where price>20; select * from Book; select * from Book where price>10;