jsp第七次作业
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 demo2;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.List;
public class Text {
static List<Book> lbs = new ArrayList<Book>();
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
creatBookList();
mnue();
}
public static void creatBookList() {
Book b1 = new Book("1", "Book1",20);
lbs.add(b1);
Book b2 = new Book("2", "Book2",20);
lbs.add(b2);
Book b3 = new Book("3", "Book3",20);
lbs.add(b3);
}
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 i = 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());
}
i++;
}
}
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");
int index = 0;
for (Book book : lbs) {
if (id.equals(book.getId())) {
lbs.remove(index);
}
index++;
}
}
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();
}
}
package demo2;
import java.io.Serializable;
public class Book {
private String id;
private String name;
private double price;
public Book(){
}
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 d) {
this.price = d;
}
public Book(String id, String name, double price) {
super();
this.id = id;
this.name = name;
this.price = price;
}
}
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="java.util.ArrayList"%>
<%@page import="demo2.Book"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
List<Book> lbs = new ArrayList<Book>();
lbs.add(new Book("1", "西游记", 20));
lbs.add(new Book("2", "红楼梦", 20));
lbs.add(new Book("3", "三国演义", 20));
lbs.add(new Book("4", "水浒传", 20));
%>
<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
CREATE TABLE `book` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(25) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `price` decimal(10, 2) NOT NULL, 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`;
