Java读取配置文件工具类

import org.apache.log4j.Logger;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class PropertyUtils {
    private static final Logger logger = Logger.getLogger(PropertyUtils.class);

    private static final Properties properties;

    static {
        properties = new Properties();
        InputStream inputStream = PropertyUtils.class.getClassLoader().getResourceAsStream("provinces_cities.properties");
        if (inputStream != null) {
            try {
                properties.load(inputStream);
            } catch (IOException e) {
                logger.error("读取配置文件失败", e);
            }
        }
    }

    //供外部调用，配置文件只读取一次，节约内存
    public static String getProperty(String param) {
        return properties.getProperty(param);
    }
}

提供一个读取任意配置文件的工具类（注意中文乱码的问题）

public class PropertyUtil {
    private static final Logger logger = LoggerFactory.getLogger(PropertyUtil.class);

    private static Properties props;

    synchronized static private void loadProps(String fileName) {
        props = new Properties();
        InputStreamReader in = null;
        try {
            in = new InputStreamReader(PropertyUtil.class.getClassLoader().getResourceAsStream(fileName + ".properties"), "GBK");
            props.load(in);
        } catch (IOException e) {
            logger.error("出现IOException", e);
        } finally {
            try {
                if (null != in) {
                    in.close();
                }
            } catch (IOException e) {
                logger.error("文件流关闭出现异常", e);
            }
        }
    }


    public static String getProperty(String fileName, String key) {
        if (null == props) {
            loadProps(fileName);
        }
        return props.getProperty(key);
    }
}