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 aaa;

public class Book {
    private String id;
    private String name;
    private double price;

    public Book() {

    }

    public Book(String id, String name, double price) {
        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 double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

}

package aaa;

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

public class Test {
    static List<book> lbs = new ArrayList<book>();

    static {
        book b1 = new book("001", "xyj", 40);
        lbs.add(b1);
        book b2 = new book("002", "sgyy", 50);
        lbs.add(b2);
        book b3 = new book("003", "shhz", 60);
        lbs.add(b3);
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        mnue();
    }

    public static void mnue() {
        for (;;) {
            System.out.println("***********************");
            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、查询所有图书                    *");
            System.out.println("*    5、查询一本图书                    *");
            System.out.println("*    0、退出程序                            *");
            System.out.println("***********************");
            int i = inputInt("请输入要选择的操作：");
            switch (i) {
            case 1:
                addBook();
                break;
            case 2:
                delBook();
                break;
            case 3:
                updateBook();
                break;
            case 4:
                findAllBook();
                break;
            case 5:
                findBookByName();
                break;
            case 0:
                return;
            default:
                System.out.println("输入错误,请重新输入");
                break;
            }
        }
    }

    private static void findBookByName() {
        String name = inputStr("请输入要查找的图书名称");
        int index = 0;
        System.out.println("id\t图书名称\t价格");
        for (book book : lbs) {
            if (name.equals(book.getName())) {
                System.out.println(book.getId() + "\t" + book.getName() + "\t"
                        + book.getPrice());
            }
            index++;
        }
    }

    private static void findAllBook() {
        System.out.println("id\t图书名称\t价格");
        for (book book : lbs) {
            System.out.println(book.getId() + "\t" + book.getName() + "\t"
                    + book.getPrice());
        }

    }

    private static void updateBook() {
        String id = inputStr("请输入要修改的图书id");
        int index = 0;
        for (book book : lbs) {
            if (id.equals(book.getId())) {
                book.setName(inputStr("请输入修改后的名称:"));
                book.setPrice(inputDouble("请输入修改后的价格:"));
                lbs.remove(index);
                lbs.add(index, book);
            }
            index++;
        }
    }

    private static void delBook() {
        String id = inputStr("请输入要删除的图书id");
        for (int i = 0;i < lbs.size();i++) {
            if (id.equals(lbs.get(i).getId())) {
                lbs.remove(i);
            }
        }

    }

    private static void addBook() {
        String id = inputStr("请输入图书id");
        String name = inputStr("请输入图书名称");
        double price = inputDouble("请输入图书价格");
        book book = new book(id, name, price);
        lbs.add(book);
    }

    public static String inputStr(String msg) {
        System.out.print(msg);
        return new Scanner(System.in).nextLine();
    }

    public static int inputInt(String msg) {
        System.out.print(msg);
        return new Scanner(System.in).nextInt();
    }

    public static double inputDouble(String msg) {
        System.out.print(msg);
        return new Scanner(System.in).nextDouble();
    }

}

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="aaa.book"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML >
<html>
  <head>
</head>
 <body>
    <%
        List<book> listbooks = new ArrayList<book>();
        book b1 = new book("001", "xyj", 40);
        listbooks.add(b1);
        book b2 = new book("002", "sgyy", 50);
        listbooks.add(b2);
        book b3 = new book("003", "shhz", 60);
        listbooks.add(b3);
        for (int i = 0; i < listbooks.size(); i++) {
            out.print(listbooks.get(i).getId() + ": " + listbooks.get(i).getName() + "  " + listbooks.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

在MySQL中创建Book表，里面id,name,price    
    create table book(
    -> id int(10) auto_increment primary key,
    -> name varchar(50),
    -> price double(5,1));
添加5个图书
insert into Book(id,name,price)values(1,"我的家",20);
insert into Book(id,name,price)values(2,"西游记",22);
insert into Book(id,name,price)values(3,"水浒传",15);
insert into Book(id,name,price)values(4,"新三国",10);
insert into Book(id,name,price)values(5,"红楼梦",28);
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;