9

package text;

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

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

        public Book() {
            super();
        }
    }

    package text;

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

    public class BookTest {
        static List<Book> listbooks = new ArrayList<Book>();

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

        }

        public static void creatBookList() {
            // TODO Auto-generated method stub
            Book b1 = new Book("1.", "  VB  ", 39.9);
            listbooks.add(b1);
            Book b2 = new Book("2.", "  VS  ", 59.9);
            listbooks.add(b2);
            Book b3 = new Book("3.", "  C++ ", 49.9);
            listbooks.add(b3);
            Book b4 = new Book("4.", "  java", 69.9);
            listbooks.add(b4);
        }
        

        public static void menu() {
            for (;;) {
                System.out.println("------------------------");
                System.out.println("-       1添加图书          -");
                System.out.println("-       2修改图书          -");
                System.out.println("-       3删除图书          -");
                System.out.println("-       4查询图书          -");
                System.out.println("-       5退出程序          -");
                System.out.println("------------------------");
                int a = inputInt("请选择操作：");
                switch (a) {
                case 1:
                    addBook();
                    break;
                case 2:
                    updateBook();
                    break;
                case 3:
                    delBook();
                    break;
                case 4:
                    findBook();
                    break;
                case 5:
                    return;
                default:
                    System.out.println("输入错误，请重新输入");
                    break;
                }
            }
        }

        private static void findBook() {
            // TODO Auto-generated method stub
            System.out.println("id 图书名称  图书价格");
            for (Book book : listbooks) {
                System.out.println(book.getId() + " " + book.getName() + "    "
                        + book.getPrice());
            }

        }

        private static void delBook() {
            // TODO Auto-generated method stub
            String id = inputStr("请输入要删除图书的id");
            for (int i = 0; i < listbooks.size(); i++) {
                Book book = listbooks.get(i);
                if (id.equals(book.getId())) {
                    listbooks.remove(i);
                }
            }

        }

        private static void updateBook() {
            // TODO Auto-generated method stub
            String id = inputStr("请输入要修改的图书id");
            for (int i = 0; i < listbooks.size(); i++) {
                Book book = listbooks.get(i);
                if (id.equals(book.getId())) {
                    book.setName(inputStr("请输入修改后的图书名称："));
                    book.setPrice(inputDouble("请输入修改后的图书价格"));
                    listbooks.remove(i);
                    listbooks.add(i, book);
                }
            }

        }

        private static void addBook() {
            // TODO Auto-generated method stub
            String id = inputStr("请输入要添加的图书id");
            String name = inputStr("请输入要添加的图书名称");
            double price = inputDouble("请输入要添加的图书价格");
            Book book = new Book(id, name, price);
            listbooks.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();
        }
    }

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="work.Book"%>
<%
    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>
<title>My JSP 'index.jsp' starting page</title>
</head>

<body>
    <%
        List<Book> listbooks = new ArrayList<Book>();
        Book b1 = new Book("1", "VB", 39.9);
        listbooks.add(b1);
        Book b2 = new Book("2", "VS, 59.9);
        listbooks.add(b2);
        Book b3 = new Book("3", "C++", 49.9);
        listbooks.add(b3);
        Book b4 = new Book("4", "java", 69.9);
        listbooks.add(b4);
        for (int i = 0; listbooks != null && i < listbooks.size(); i++) {
            out.print(listbooks.get(i).getId() + ": "
                    + listbooks.get(i).getName() + "  "
                    + listbooks.get(i).getPrice() + "<br>");
        }
    %>

</body>
</html>