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 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 id, String name, double price) {
super();
this.id = id;
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", " JavaScript ", 59.8);
listbooks.add(b1);
Book b2 = new Book("2", " Android移动应用 ", 49.9);
listbooks.add(b2);
Book b3 = new Book("3", " 信息系统分析与设计", 49.8);
listbooks.add(b3);
}
public static void menu() {
for (;;) {
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");
int i = inputInt("请选择你的操作:");
switch (i) {
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();
}
}
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="book.Book"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head></head>
<body>
图书：<br>
<%
ArrayList<Book> list=new ArrayList<Book>();
Book book1=new Book(1,"骆驼祥子",55);
Book book2=new Book(2,"我的爱人",18);
Book book3=new Book(3,"老人与海",35);
list.add(book1);
list.add(book2);
list.add(book3);
for (int i = 0; i < list.size(); i++) {
Book b=list.get(i);
int id=b.getId();
String name=b.getName();
double price=b.getPrice();
out.print("id："+id+" ， 书名为："+name+" ，价格为："+price);
%><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
# 建表
create table book(
id double(100,10) primary key auto_increment,
name varchar(10) not null ,
price double(100,10)
);
#插入数据
insert into book (name, price) values ('昨日今昔',21),('我的家乡',12),('Java之路',8);
insert into book (name, price) values ('不一样的成长',15),('我你他',6);
insert into book (name, price) values ('中国简史',25);
#查询价格大于10的书籍信息
select * from book where price>10;
#查询所有书籍信息
select * from book;
#将价格大于20的书籍的价格改为18.8
update book set price=18.8 where price>20;
#删除”我“开头的书籍信息
delete from book where name like'我%';
#删除指定名称的书籍信息
delete from book where name='不一样的成长';
#删除所有书籍信息
delete from book;
#删除表
drop table book;
