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 booker;

public class Book {
            private Integer id;
            private String name;
            private double price;
            public Book() {
                super();
                // TODO Auto-generated constructor stub
            }

            public Book(Integer id, String name, double price) {
                super();
                this.id = id;
                this.name = name;
                this.price = 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;
            }

            @Override
            public String toString() {
                return "Book [id=" + id + ", name=" + name + ", price=" + price + "]";
            }

    }

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


public class TestBook {

     /**
     * @param args
     */
    public static void main(String[] args) {
        List<Book> list = new ArrayList<Book>();
        Book book = new Book();
        Book b1=new Book(1,"选集",15.0);
        Book b2=new Book(2,"马克思主义哲学",20.25);
        Book b3=new Book(3,"狼道",20.50);
        list.add(b1);
        list.add(b2);
        list.add(b3);
        menu(list, book);

    }
    public static void menu(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");
            menu(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");
            menu(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");
            menu(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());
            }
            menu(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"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@page import="booker.Book" %>
<!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 b1=new Book(1,"选集",15.0);
        Book b2=new Book(2,"马克思主义哲学",20.25);
        Book b3=new Book(3,"狼道",20.50);
        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