Java 带参数Properties文件的操作

/**  
* 实现Properties的读取、带参数文件的配置
*/  
public String getPropByKey(String key) {
    String[] params = {"2017","你好"};
    String msg = null;
    InputStream in = null;
    Properties prop = new Properties();

    try {
        // 读取属性文件messages.properties
        in = this.getClass().getResourceAsStream("messages.properties");
        // 
        prop.load(in);
        // 根据Key值替换对应的参数，并返回替换后的value
        String mf = MessageFormat.format("welcome",params);
        // 保存到prop对象
        prop.setProperty("welcome", mf);
        // key = "username",
        msg = prop.getProperty(key);

    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return msg;
}