jsp7
作者：互联网
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
1 package text;
2
3 public class Book {
4 private String id;
5 private String name;
6 private double price;
7 public String getId() {
8 return id;
9 }
10 public void setId(String id) {
11 this.id = id;
12 }
13 public String getName() {
14 return name;
15 }
16 public void setName(String name) {
17 this.name = name;
18 }
19 public double getPrice() {
20 return price;
21 }
22 public void setPrice(double price) {
23 this.price = price;
24 }
25 public Book(String id, String name, double price) {
26 super();
27 this.id = id;
28 this.name = name;
29 this.price = price;
30 }
31 public Book() {
32 super();
33 }
34
35 }
1 package text;
2
3 import java.util.ArrayList;
4 import java.util.List;
5 import java.util.Scanner;
6
7 public class BookTest {
8 static List<Book> listbooks = new ArrayList<Book>();
9
10 /**
11 * @param args
12 */
13 public static void main(String[] args) {
14 // TODO Auto-generated method stub
15 creatBookList();
16 menu();
17
18 }
19
20 public static void creatBookList() {
21 // TODO Auto-generated method stub
22 Book b1 = new Book("1", " JavaScript ", 59.8);
23 listbooks.add(b1);
24 Book b2 = new Book("2", " Android移动应用 ", 49.9);
25 listbooks.add(b2);
26 Book b3 = new Book("3", " 信息系统分析与设计", 49.8);
27 listbooks.add(b3);
28 }
29
30 public static void menu() {
31 for (;;) {
32 System.out.println("1.添加图书");
33 System.out.println("2.修改图书");
34 System.out.println("3.删除图书");
35 System.out.println("4.查询图书");
36 System.out.println("5.退出程序");
37 int i = inputInt("请选择你的操作:");
38 switch (i) {
39 case 1:
40 addBook();
41 break;
42 case 2:
43 updateBook();
44 break;
45 case 3:
46 delBook();
47 break;
48 case 4:
49 findBook();
50 break;
51 case 5:
52 return;
53 default:
54 System.out.println("输入错误,请重新输入");
55 break;
56 }
57 }
58 }
59
60 private static void findBook() {
61 // TODO Auto-generated method stub
62 System.out.println("id 图书名称 图书价格");
63 for (Book book : listbooks) {
64 System.out.println(book.getId() + " " + book.getName() + " "
65 + book.getPrice());
66 }
67
68 }
69
70 private static void delBook() {
71 // TODO Auto-generated method stub
72 String id = inputStr("请输入要删除图书的id");
73 for (int i = 0; i < listbooks.size(); i++) {
74 Book book = listbooks.get(i);
75 if (id.equals(book.getId())) {
76 listbooks.remove(i);
77 }
78 }
79
80 }
81
82 private static void updateBook() {
83 // TODO Auto-generated method stub
84 String id = inputStr("请输入要修改的图书id");
85 for (int i = 0; i < listbooks.size(); i++) {
86 Book book = listbooks.get(i);
87 if (id.equals(book.getId())) {
88 book.setName(inputStr("请输入修改后的图书名称："));
89 book.setPrice(inputDouble("请输入修改后的图书价格"));
90 listbooks.remove(i);
91 listbooks.add(i, book);
92 }
93 }
94
95 }
96
97 private static void addBook() {
98 // TODO Auto-generated method stub
99 String id = inputStr("请输入要添加的图书id");
100 String name = inputStr("请输入要添加的图书名称");
101 double price = inputDouble("请输入要添加的图书价格");
102 Book book = new Book(id, name, price);
103 listbooks.add(book);
104
105 }
106
107 public static String inputStr(String msg) {
108 System.out.print(msg);
109 return new Scanner(System.in).nextLine();
110 }
111
112 public static int inputInt(String msg) {
113 System.out.print(msg);
114 return new Scanner(System.in).nextInt();
115 }
116
117 public static double inputDouble(String msg) {
118 System.out.print(msg);
119 return new Scanner(System.in).nextDouble();
120 }
121
122 }
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。
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
2 <%@page import="com.gd.entity.Book"%>
3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4 <html>
5 <head>
6 </head>
7
8 <body>
9 <%
10 List<Book> list = new ArrayList<Book>();
11 Book b1=new Book(1 "JavaScript " 59.8);
12 Book b2=new Book(2 "Android移动应用 " 49.9);
13 Book b3=new Book(3 "信息系统分析与设计" 49.8);
14 list.add(b1);
15 list.add(b2);
16 list.add(b3);
17 for (int i = 0; list != null && i < list.size(); i++) {
18 out.print(list.get(i).getId() + "." + list.get(i).getName()
19 + "," + list.get(i).getPrice() + "<br>");
20 }
21 %>
22 </body>
23 </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
标签：String,System,id,Book,jsp7,public,图书 来源： https://www.cnblogs.com/yanggongbo/p/16212654.html