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 aa;

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() {
        super();
    }
    
    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;
    }
    
    

}

package aa;

    import java.util.ArrayList;
    import java.util.List;
    import java.util.Scanner;
    
    public class Main {
        public static void main(String[] args) {
            List<Book> list = new ArrayList<Book>();
            Book book = new Book();
             Book b1 = new Book(1, "撒野", 123.23);
             Book b2 = new Book(2, "笑场", 456.56);
             Book b3 = new Book(3, "烟与镜", 789.89);

            list.add(b1);
            list.add(b2);
            list.add(b3);
            show(list, book);
        }

        public static void show(List<Book> list, Book book) {
            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");
            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("请添加图书的编号：");
                book.setId(new Scanner(System.in).nextInt());
                System.out.println("请添加图书的名称：");
                book.setName(new Scanner(System.in).next());
                System.out.println("请添加图书的价格：");
                book.setPrice(new Scanner(System.in).nextDouble());
                list.add(book);
                System.out.println("添加成功");
                show(list, book);

                break;
            case 2:
                System.out.println("请输入要删除图书的名称：");
                String name=new Scanner(System.in).next();
                for (int j = 0; list != null && j < list.size(); j++) {
                    if (list.get(j).getName().equals(name)) {
                        list.remove(j);
                    }
                }
                System.out.println("删除成功");
                show(list, book);
                break;
            case 3:
                System.out.println("请输入要修改图书的编号：");
                int k=new Scanner(System.in).nextInt();;
                for (int j = 0; list != null && j < list.size(); j++) {
                    if (list.get(j).getName().equals(k)) {
                        list.remove(j);
                        System.out.println("请输入修改后图书的名称：");
                        String name1=new Scanner(System.in).next();
                        System.out.println("请输入修改后图书的价格：");
                        double price1=new Scanner(System.in).nextDouble();
                        Book b=new Book(k,name1,price1);
                        list.add(b);
                        break;
                    }
                }
                System.out.println("修改成功");
                show(list, book);
                break;

            case 4:
                for (int j = 0; list != null && j < list.size(); j++) {
                    System.out.println(list.get(j).getId() + "."
                            + list.get(j).getName() + "," + list.get(j).getPrice());
                }
                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 language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@page import="hy.Book"%>
<%
    request.setCharacterEncoding("UTF-8");
    response.setCharacterEncoding("UTF-8");
    %>
<%
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>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    <%
        List<Book> list = new ArrayList<Book>();
        Book book = new Book();
        Book b1 = new Book(1, "撒野", 123.23);
        Book b2 = new Book(2, "笑场", 456.56);
        Book b3 = new Book(3, "烟与镜", 789.89);
        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

创建表
      create table books{
      id int not null,
      name varchar()
      price decimal,
      primary key(id)
            };
添加1个图书
 insert into Book(id,name,price)values(1,"某某",50);
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块的全部图书
 select * from book where price>10;
把所有名称是“我”开头的图书删除
 delete from book where name like '我%';
删除全部图书
 delete from book;