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 abc;
 
 
    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, "默读", 120);
            book b2 = new book(2, "一级律师", 90);
            book b3 = new book(3, "Romeo and Juliet", 134);
            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).getId().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;
            }
        }
 
    }

package abc;
 
public class book {
     private Integer id;
        private String name;
        private double price;
        public Integer getId() {
            return id;
        }
        public void setId(Integer 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(Integer id, String name, double price) {
            super();
            this.id = id;
            this.name = name;
            this.price = price;
        }
        public book() {
            super();
        }
         
 
}

 

 

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。

<%-- Librsry.jsp --%>
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@ page import="po.Book"%>
<%@ page import="java.util.List"%>
<%@ page import="java.util.ArrayList"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
    <%
        List<Book> blist = new ArrayList<>();
        Book b1 = new Book();
        b1.setBid(1);
        b1.setBname("三国");
        b1.setBprice(55);
        blist.add(b1);
        Book b2 = new Book();
        b2.setBid(2);
        b2.setBname("水浒");
        b2.setBprice(45);
        blist.add(b2);
        Book b3 = new Book();
        b3.setBid(3);
        b3.setBname("西游");
        b3.setBprice(35);
        blist.add(b3);
        for (Book b : blist) {
            int bid = b.getBid();
            String bname = b.getBname();
            double bprice = b.getBprice();
 
            out.print("<li>商品id&nbsp" + bid + "&nbsp商品名：" + bname + "&nbsp价格：" + bprice + "&nbsp</li>");
 
        }
    %>
</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 PRIMARY KEY auto_increment,
name varchar(30) NOT NULL,
price DOUBLE 
);
select * from book;
INSERT INTO book (name,price) VALUE("三国",10);
INSERT into book(name,price) value("水浒",20);
insert into book(name,price) VALUE("西游",30);
update book set price=18.8 where price>20;
select * from book where price>10;
delete from book where name like '我%';

 

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