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="com.lwk.demo5.Book"%> <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <% List<Book> lbs = new ArrayList<Book>(); lbs.add(new Book("10001", "西游记", 50.8)); lbs.add(new Book("10002", "红楼梦", 59.6)); lbs.add(new Book("10003", "三国演义", 65.5)); lbs.add(new Book("10004", "水浒传", 49.9)); %> <table> <tr> <th>图书编号</th> <th>图书名称</th> <th>图书价格</th> </tr> <% for (int i = 0; i < lbs.size(); i++) { %> <tr> <td><%=lbs.get(i).getId()%></td> <td><%=lbs.get(i).getName()%></td> <td><%=lbs.get(i).getPrice()%></td> </tr> <% } %> </table> </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
DROP TABLE IF EXISTS `book`;
CREATE TABLE `book` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '图书编号',
`name` varchar(25) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '图书名称',
`price` decimal(10, 2) NOT NULL COMMENT '图书价格',
PRIMARY KEY (`id`) USING BTREE
);
INSERT INTO `book` VALUES (1, '水浒传', 50.90);
INSERT INTO `book` VALUES (2, '红楼梦', 40.50);
INSERT INTO `book` VALUES (3, '西游记', 45.90);
INSERT INTO `book` VALUES (4, '我的第一本书', 20.00);
UPDATE `book` SET `price`=18.8 WHERE `price`>20;
SELECT * FROM `book`;
SELECT * FROM `book` WHERE `price`>10;
DELETE FROM `book` WHERE `name` LIKE '我%';
DELETE FROM `book`;
