java 资源文件

1、在src目录下创建application.properties文件；

2、创建读取资源文件的类

public class PropertiesUtil {

    private static PropertiesUtil instance;

    /* 默认文件名称 */
    private final static String fileName = "application.properties";

    private static Properties properties;

    /**
     * 初始化
     */
    public static void init() {
        if (null == instance) {
            instance = new PropertiesUtil();
        }
        if (null == properties) {
            properties = new Properties();
            // 读取资源文件
            InputStream inputStream = PropertiesUtil.class.getClassLoader()
                    .getResourceAsStream(fileName);
            try {
                properties.load(inputStream);
            } catch (IOException ie) {
                ie.printStackTrace();
            }
        }
    }

    public static PropertiesUtil getInstance() {
        init();
        return instance;
    }

    /**
     * 读取资源文件
     *
     * @param key关键字
     * @return
     * @throws Exception
     */
    public String getProperties(String key) {
        try {
            if (null == properties) {
                init();
            }
            return properties.getProperty(key);
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }
}