Java读取.properties资源文件的常用2种方法

1、使用ResourceBundle

public class Resources {

public static final Log LOG = LogFactory.getLog(Resources.class.getName());

private static final String PREFIX = "conf."; //包名称
private ResourceBundle resource;

public Resources(String fileName){
try {
resource = ResourceBundle.getBundle(PREFIX + fileName, Locale.getDefault()); //eg. conf/mysql.properties
} catch (MissingResourceException e) {
// TODO: handle exception
e.printStackTrace();
}
}

public String get(String key){
String ret = null;
ret = resource.getString(key);
if(ret == null){
LOG.error("key : "+key +" not existed or value of the key is null");
}
return ret.trim();
}
}

2、使用Properties

public class Resources {

private Properties pro;

public Resources() throws IOException{
FileInputStream  in = new FileInputStream("mysql.properties");
pro = new Properties();
pro.load(in);
in.close();
}

public String get(String key){
return pro.getProperty(key);
}
}