two_project/src/main/java/com/mathgenerator/service/EmailConfig.java

package com.mathgenerator.service;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class EmailConfig {
    private static final Properties properties = new Properties();

    static {
        try (InputStream input = new FileInputStream("config.properties")) {
            properties.load(input);
        } catch (IOException ex) {
            System.err.println("错误：无法加载 config.properties 文件！请确保该文件在项目根目录中。");
            ex.printStackTrace();
        }
    }

    public static String getHost() {
        return properties.getProperty("smtp.host");
    }

    public static int getPort() {
        return Integer.parseInt(properties.getProperty("smtp.port"));
    }

    public static String getUsername() {
        return properties.getProperty("smtp.username");
    }

    public static String getPassword() {
        return properties.getProperty("smtp.password");
    }
}