The phenomenon of "scalpers" outside the Sam's supermarket in Shaoxing, Zhejiang Province, has attracted widespread attention. By providing check-in and check-out services, these "scalpers" allow consumers without a membership card to enter the supermarket and make purchases. This behavior not only disrupts the market order, but also poses a challenge to the membership management system of Sam's Club. Today, we will explore how to use Java to implement a more robust membership management system to effectively prevent the phenomenon of "scalping".
I. Background of the issue and analysis of needs
The membership system of Sam's Club is one of its core competencies, and members need a membership card to enter the supermarket for shopping. However, "scalpers" take advantage of the loopholes in the system to profit by bringing people in and checking out multiple times. In order to combat this behavior, we need to upgrade our membership management system with the following features:
- Member Authentication: Ensure that only legitimate members have access to supermarkets.
- Consumption frequency monitoring: Monitor members' spending frequency to detect abnormal spending behavior in a timely manner.
- blacklisting: Blacklist identified "scalpers" and prohibit them from re-entering the supermarket.
II. System design
In order to realize the above functions, we can design a Java-based membership management system. The system mainly includes the following modules:
- Member Verification Module: Responsible for verifying membership.
- Consumption Monitoring Module: Responsible for monitoring the frequency of member spending.
- Blacklist Management Module: Responsible for adding, querying and deleting operations of the blacklist.
III. System implementation
1. Member validation module
The member authentication module mainly authenticates members by their card number and password. We can use the JavaHashMapto store membership information, where the key is the membership card number and the value is the membership password and other related information.
import ;
import ;
public class MemberValidator {
private Map<String, String> members;
public MemberValidator() {
members = new HashMap<>();
// Initialize member information，Here's an example of hardcoding，Practical applications should read from the database
("123456", "password123");
("654321", "password321");
}
public boolean validateMember(String cardNumber, String password) {
return (cardNumber) && (cardNumber).equals(password);
}
}
2. Consumption monitoring module
Consumption monitoring module mainly monitors the frequency of member's consumption by recording the time and number of times they consume. We can useHashMapto store the member's consumption record, where the key is the membership card number and the value is the consumption time list.
import ;
import ;
import ;
import ;
public class ConsumptionMonitor {
private Map<String, List<Long>> consumptionRecords;
private static final int THRESHOLD = 5; // Setting consumption frequency thresholds，for example5substandard
private static final long INTERVAL = 3600 * 1000; // Setting time interval，for example1hourly
public ConsumptionMonitor() {
consumptionRecords = new HashMap<>();
}
public void recordConsumption(String cardNumber) {
long currentTime = ();
(cardNumber, new ArrayList<>());
List<Long> record = (cardNumber);
// Clearance of obsolete records
(time -> currentTime - time > INTERVAL);
// Record the current consumption time
(currentTime);
// Check if thresholds are exceeded
if (() > THRESHOLD) {
("Warning: Member " + cardNumber + " has exceeded the consumption threshold!");
// You can replace the logic here with actions such as blacklisting members.
}
}
}
3. Blacklist management module
Blacklist management module is mainly responsible for blacklist adding, querying and deleting operations. We can useHashSetto store the membership card numbers in the blacklist.
import ;
import ;
public class BlacklistManager {
private Set<String> blacklist;
public BlacklistManager() {
blacklist = new HashSet<>();
}
public void addToBlacklist(String cardNumber) {
(cardNumber);
}
public boolean isInBlacklist(String cardNumber) {
return (cardNumber);
}
public void removeFromBlacklist(String cardNumber) {
(cardNumber);
}
}
4. System integration and testing
Finally, we integrated the above modules into a single system and tested it.
public class MemberManagementSystem {
private MemberValidator validator;
private ConsumptionMonitor monitor;
private BlacklistManager blacklistManager;
public MemberManagementSystem() {
validator = new MemberValidator();
monitor = new ConsumptionMonitor();
blacklistManager = new BlacklistManager();
}
public boolean checkMemberEntry(String cardNumber, String password) {
if ((cardNumber)) {
("Member " + cardNumber + " is in the blacklist, access denied!");
return false;
}
if ((cardNumber, password)) {
// Recording of consumption
(cardNumber);
return true;
} else {
("Invalid member credentials, access denied!");
return false;
}
}
public static void main(String[] args) {
MemberManagementSystem system = new MemberManagementSystem();
// Simulated Member Access to Supermarket
String cardNumber = "123456";
String password = "password123";
for (int i = 0; i < 6; i++) {
boolean allowed = (cardNumber, password);
if (!allowed) {
// Blacklisting of members
(cardNumber);
break;
}
}
// Trying to get into the supermarket again
boolean result = (cardNumber, password);
("Member " + cardNumber + " access result: " + result);
}
}
IV. Summary and outlook
Through the above design and implementation, we have constructed a simple membership management system, which can effectively prevent the phenomenon of "scalping". Of course, this is only a basic version, and more factors need to be considered in the actual application, such as integration with the database, concurrency processing, system security and so on.
At the same time, we can also utilize big data and machine learning technologies to conduct more in-depth analysis and prediction of members' consumption behavior, thus further improving the accuracy and reliability of the system.
Matching (schematic)：
+----------------------+
| Membership Management System |
+----------------------+
| 1. Member Verification Module |
| - Verify Membership |
+----------------------+
2. Consumption Monitoring Module | - Monitor Consumption Frequency | ++
| - Monitor consumption frequency |
| - Warns of abnormal spending |
+----------------------+
| 3. Blacklist Management Module | - Add Blacklist | - Add Blacklist | - Add Blacklist | - Add Blacklist
| - Add Blacklist | - Query Blacklist | - Add Blacklist
| - Query Blacklist | - Delete Blacklist
| - Delete Blacklist |
+----------------------+
I hope this article will help you better understand how to implement anti-scalping strategies for membership management systems in Java and provide inspiration for your project development.
Author:Mr. Die's Programming Class
Provenance:/
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