在静态方法中读取application.properties

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

public class ConfigReader {
    private static final String PROPERTY_FILE = "application.properties";

    public static String getProperty(String key) {
        try {
            Properties properties = new Properties();
            InputStream inputStream = ConfigReader.class.getClassLoader().getResourceAsStream(PROPERTY_FILE);
            properties.load(inputStream);
            return properties.getProperty(key);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}