PropertiesConfiguration的用法

PropertiesConfiguration是一个配置文件的加载工具类，封装了从配置文件里获取值并转化为基本数据类型的方法。

使用org.apache.commons.configuration2中提供的工具来读取属性文件 
1.创建Java工程 
2.引入所需jar包 
 
3.在src下创建属性文件properties.properties，内容如下：

username=eclipse
password=123456

4.创建工具类PropsUtils

public class PropertyUtils {
    public static void main(String[] args) throws FileNotFoundException, ConfigurationException, IOException {
    String relativelyPath = System.getProperty("user.dir");//获取当前项目的根目录
    PropertiesConfiguration config = new PropertiesConfiguration();
    config.read(new FileReader(relativelyPath + "/src/properties.properties"));
    String username = config.getString("username");
    System.out.println(username);
    String password = config.getString("password");
    System.out.println(password);
    }
}

它来自commons-configuration-1.6.jar。

直接上代码：

public class Config {
    private static PropertiesConfiguration config = null;

    static {
        try {
            config = new PropertiesConfiguration(
                    "config.properties");
        } catch (ConfigurationException e) {
            e.printStackTrace();
        }
    }

    public static String getString(String key) {
        return config.getString(key);
    }

    public static String getString(String key, String def) {
        return config.getString(key, def);
    }

    public static int getInt(String key) {
        return config.getInt(key);
    }

    public static int getInt(String key, int def) {
        return config.getInt(key, def);
    }

    public static long getLong(String key) {
        return config.getLong(key);
    }

    public static long getLong(String key, long def) {
        return config.getLong(key, def);
    }

    public static float getFloat(String key) {
        return config.getFloat(key);
    }

    public static float getFloat(String key, float def) {
        return config.getFloat(key, def);
    }

    public static double getDouble(String key) {
        return config.getDouble(key);
    }

    public static double getDouble(String key, double def) {
        return config.getDouble(key, def);
    }

    public static boolean getBoolean(String key) {
        return config.getBoolean(key);
    }

    public static boolean getBoolean(String key, boolean def) {
        return config.getBoolean(key, def);
    }

    public static String[] getStringArray(String key) {
        return config.getStringArray(key);
    }

    @SuppressWarnings("unchecked")
    public static List getList(String key) {
        return config.getList(key);
    }

    @SuppressWarnings("unchecked")
    public static List getList(String key, List def) {
        return config.getList(key, def);
    }

    public static void setProperty(String key, Object value) {
        config.setProperty(key, value);
    }

}