yuxiuhui/src/auth/UserManager.java

package auth;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.*;
import java.io.IOException;
public class UserManager {
    private List<User> users = new ArrayList<>();
    public static int line_num= 0;
    public UserManager() {
        // 要读取的文件路径
        String filePath = "user.txt";
        // 调用方法读取文件并获取三个数据列表
        DataLists dataLists = readDataFile(filePath);
        for(int i=0;i<line_num;i++) {
            users.add(new User(dataLists.list1.get(i), dataLists.list2.get(i), dataLists.list3.get(i)));
        }
    }

    public User login(String username, String password) {
        for (User user : users) {
            if (user.getUsername().equals(username) && user.getPassword().equals(password)) {
                return user;
            }
        }
        return null;
    }
    static class DataLists {
        List<String> list1;
        List<String> list2;
        List<String> list3;

        DataLists(List<String> list1, List<String> list2, List<String> list3) {
            this.list1 = list1;
            this.list2 = list2;
            this.list3 = list3;
        }
    }
    public static DataLists readDataFile(String filePath) {
        List<String> list1 = new ArrayList<>();
        List<String> list2 = new ArrayList<>();
        List<String> list3 = new ArrayList<>();
        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            String line;
            int lineNumber = 1;
            // 逐行读取
            while ((line = br.readLine()) != null) {
                // 去除首尾空格
                line = line.trim();

                // 跳过空行
                if (line.isEmpty()) {
                    continue;
                }
                // 分割行数据，这里假设使用空格分隔
                // 如果是其他分隔符(如逗号、制表符)，请修改正则表达式
                String[] parts = line.split("\\s+");
                if (parts.length != 3) {
                    System.out.println("警告: 第" + lineNumber + "行数据格式不正确，需要3个数据，实际有" + parts.length + "个");
                    lineNumber++;
                    continue;
                }
                // 将三个数据分别添加到对应的列表
                list1.add(parts[0]);
                list2.add(parts[1]);
                list3.add(parts[2]);
                lineNumber++;
            }
            line_num=lineNumber-1;
            return new DataLists(list1, list2, list3);
        }catch (IOException e) {
            System.out.println("读取文件时发生错误: " + e.getMessage());
            e.printStackTrace();
            return null;
        }
    }
}