无法在Java Web应用程序中读取属性文件？

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

public class PropertiesReader {

    public Properties readProperties(String fileName) {
        Properties properties = new Properties();
        InputStream inputStream = null;
        try {
            inputStream = getClass().getClassLoader().getResourceAsStream(fileName);
            if (inputStream == null) {
                System.out.println("Could not find the properties file: " + fileName);
                return null;
            }
            properties.load(inputStream);
        } catch (IOException e) {
            System.out.println("Could not load the properties file: " + fileName);
            e.printStackTrace();
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return properties;
    }
}