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 BOOK;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Lib {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
        List<Book> blist = new ArrayList<>();
        Book b1 = new Book();
        b1.setBid(1);
        b1.setBname("Java设计");
        b1.setBprice(45);
        blist.add(b1);
        Book b2 = new Book();
        b2.setBid(2);
        b2.setBname("Android设计");
        b2.setBprice(35);
        blist.add(b2);
        Book b3 = new Book();
        b3.setBid(3);
        b3.setBname("JavaWeb设计");
        b3.setBprice(55);
        blist.add(b3);
        w: while (true) {
            System.out.println("1.增加2.删除3.修改4.查询");
            System.out.println("输入您的选择：");
            int x = sc.nextInt();
            int i;
            String n;
            double p;
            switch (x) {
            case 1:
                System.out.println("输入Book的id：");
                i = sc.nextInt();
                System.out.println("输入Book的name：");
                n = sc.next();
                System.out.println("输入Book的price：");
                p = sc.nextDouble();
                add(i, n, p, blist);
                break;
            case 2:
                System.out.println("输入Book的id：");
                i = sc.nextInt();
                delete(i, blist);
                break;
            case 3:
                System.out.println("输入Book的id：");
                i = sc.nextInt();
                System.out.println("输入Book的price：");
                p = sc.nextDouble();
                update(i, p, blist);
                break;
            case 4:
                System.out.println("是否查询所有：(y/n)");
                String pd = sc.next();
                if (pd.equals("y")) {
                    for (Book book : blist) {
                        System.out.println(book.toString());
                    }
                } else {
                    System.out.println("输入Book的name：");
                    n = sc.next();
                    List<Book> blist1 = select(n, blist);
                    for (Book book : blist1) {
                        System.out.println(book.toString());
                    }
                }

                break;
            default:

                break w;
            }
        }
    }

    public static void add(int i, String n, double p, List<Book> blist) {
        Book b1 = new Book();
        b1.setBid(i);
        b1.setBname(n);
        b1.setBprice(p);
        blist.add(b1);
    }

    public static void delete(int i, List<Book> blist) {
        for (Book b : blist) {
            if (b.getBid() == i) {
                blist.remove(b);
            }
        }
    }

    public static void update(int i, double p, List<Book> blist) {
        for (Book b : blist) {
            if (b.getBid() == i) {
                b.setBprice(p);
            }
        }
    }

    public static List<Book> select(String n, List<Book> blist) {
        List<Book> blist1 = new ArrayList<>();
        for (Book b : blist) {
            if (b.getBname().equals(n)) {
                blist1.add(b);
            }
        }
        return blist1;
    }
}

package BOOK;

public class Book {
    private int bid;
    private String bname;
    private double bprice;

    public Book() {
        super();
        // TODO Auto-generated constructor stub
    }

    public Book(int bid, String bname, double bprice) {
        super();
        this.bid = bid;
        this.bname = bname;
        this.bprice = bprice;
    }

    public int getBid() {
        return bid;
    }

    public void setBid(int bid) {
        this.bid = bid;
    }

    public String getBname() {
        return bname;
    }

    public void setBname(String bname) {
        this.bname = bname;
    }

    public double getBprice() {
        return bprice;
    }

    public void setBprice(double bprice) {
        this.bprice = bprice;
    }

    @Override
    public String toString() {
        return "Book [bid=" + bid + ", bname=" + bname + ", bprice=" + bprice + "]";
    }

}

 

 

 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="BOOK.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("Java设计");
        b1.setBprice(45);
        blist.add(b1);
        Book b2 = new Book();
        b2.setBid(2);
        b2.setBname("Android设计");
        b2.setBprice(35);
        blist.add(b2);
        Book b3 = new Book();
        b3.setBid(3);
        b3.setBname("JavaWeb设计");
        b3.setBprice(55);
        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 (
    bid INT auto_increment PRIMARY KEY,
    bname VARCHAR (10),
    bprice DECIMAL (3, 1)
);

添加一个图书，

INSERT INTO Book (bid,bname, bprice)
VALUES
    (1,'微机原理', 50);

根据名称删除图书，

DELETE
FROM
    Book
WHERE
    bname = '微机原理';

把所有名称是“我”开头的图书删除，

FROM
    Book
WHERE
    bname LIKE '我%';

删除全部图书

DELETE
FROM
    Book;

把20元以上的图书价格都修改为18.8，

UPDATE Book
SET bprice = 18.8
WHERE
    bprice > 20;

查看全部图书，

SELECT  * FROM Book;

查看价格高于10块钱的全部图书

SELECT * FROM Book WHERE bprice > 10;