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 po;
public class Book {
private int bid;
private String bname;
private double bprice;
public Book() {
super();
// TODO Auto-generated constructor stub
}
public Book(int bid, String bname, double bprice) {
super();
this.bid = bid;
this.bname = bname;
this.bprice = bprice;
}
public int getBid() {
return bid;
}
public void setBid(int bid) {
this.bid = bid;
}
public String getBname() {
return bname;
}
public void setBname(String bname) {
this.bname = bname;
}
public double getBprice() {
return bprice;
}
public void setBprice(double bprice) {
this.bprice = bprice;
}
@Override
public String toString() {
return "Book [bid=" + bid + ", bname=" + bname + ", bprice=" + bprice + "]";
}
}
package po;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Lib {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc = new Scanner(System.in);
List<Book> blist = new ArrayList<>();
Book b1 = new Book();
b1.setBid(1);
b1.setBname("三国");
b1.setBprice(55);
blist.add(b1);
Book b2 = new Book();
b2.setBid(2);
b2.setBname("水浒");
b2.setBprice(45);
blist.add(b2);
Book b3 = new Book();
b3.setBid(3);
b3.setBname("西游");
b3.setBprice(35);
blist.add(b3);
w: while (true) {
System.out.println("1.增加2.删除3.修改4.查询");
System.out.println("输入您的选择：");
int x = sc.nextInt();
int i;
String n;
double p;
switch (x) {
case 1:
System.out.println("输入Book的id：");
i = sc.nextInt();
System.out.println("输入Book的name：");
n = sc.next();
System.out.println("输入Book的price：");
p = sc.nextDouble();
add(i, n, p, blist);
break;
case 2:
System.out.println("输入Book的id：");
i = sc.nextInt();
delete(i, blist);
break;
case 3:
System.out.println("输入Book的id：");
i = sc.nextInt();
System.out.println("输入Book的price：");
p = sc.nextDouble();
update(i, p, blist);
break;
case 4:
System.out.println("是否查询所有：(y/n)");
String pd = sc.next();
if (pd.equals("y")) {
for (Book book : blist) {
System.out.println(book.toString());
}
} else {
System.out.println("输入Book的name：");
n = sc.next();
List<Book> blist1 = select(n, blist);
for (Book book : blist1) {
System.out.println(book.toString());
}
}
break;
default:
break w;
}
}
}
public static void add(int i, String n, double p, List<Book> blist) {
Book b1 = new Book();
b1.setBid(i);
b1.setBname(n);
b1.setBprice(p);
blist.add(b1);
}
public static void delete(int i, List<Book> blist) {
for (Book b : blist) {
if (b.getBid() == i) {
blist.remove(b);
}
}
}
public static void update(int i, double p, List<Book> blist) {
for (Book b : blist) {
if (b.getBid() == i) {
b.setBprice(p);
}
}
}
public static List<Book> select(String n, List<Book> blist) {
List<Book> blist1 = new ArrayList<>();
for (Book b : blist) {
if (b.getBname().equals(n)) {
blist1.add(b);
}
}
return blist1;
}
}
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。
<%-- Librsry.jsp --%>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="po.Book"%>
<%@ page import="java.util.List"%>
<%@ page import="java.util.ArrayList"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
List<Book> blist = new ArrayList<>();
Book b1 = new Book();
b1.setBid(1);
b1.setBname("三国");
b1.setBprice(55);
blist.add(b1);
Book b2 = new Book();
b2.setBid(2);
b2.setBname("水浒");
b2.setBprice(45);
blist.add(b2);
Book b3 = new Book();
b3.setBid(3);
b3.setBname("西游");
b3.setBprice(35);
blist.add(b3);
for (Book b : blist) {
int bid = b.getBid();
String bname = b.getBname();
double bprice = b.getBprice();
out.print("<li>商品id " + bid + " 商品名：" + bname + " 价格：" + bprice + " </li>");
}
%>
</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,用命令实现，
CREATE TABLE Book (
bid INT auto_increment PRIMARY KEY,
bname VARCHAR (10),
bprice DECIMAL (3, 1)
);
-- 添加5个图书
INSERT INTO Book ()
VALUES
(2, '三国', 19);
INSERT INTO Book (bname, bprice)
VALUES
('水浒', 45);
INSERT INTO Book (bname, bprice)
VALUES
('西游', 55);
INSERT INTO Book (bname, bprice)
VALUES
('红楼梦', 55);
INSERT INTO Book (bname, bprice)
VALUES
('雪山飞狐', 65);
-- 把20元以上的图书价格都修改为18.8，
UPDATE Book
SET bprice = 18.8
WHERE
bprice > 20;
-- 查看全部图书，
SELECT
*
FROM
Book;
-- 查看价格高于10块钱的全部图书
SELECT
*
FROM
Book
WHERE
bprice > 10;
-- 根据名称删除图书，
DELETE
FROM
Book
WHERE
bname = '雪山飞狐';
-- 把所有名称是“我”开头的图书删除，
INSERT INTO Book (bname, bprice)
VALUES
('我是猫', 75);
DELETE
FROM
Book
WHERE
bname LIKE '我%';
-- 删除全部图书。
DELETE
FROM
Book;
