java中读取properties文件内容

package com.tgb.SpringActivemq.utils;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.log4j.Logger;

public class MqPropertyUtil {

private static final Logger logger = Logger.getLogger(MqPropertyUtil.class);
private static Properties props;
static {
loadProps();
}

synchronized static private void loadProps() {
logger.info("开始加载properties文件内容.......");
props = new Properties();
InputStream in = null;
try {
// 第一种，通过类加载器进行获取properties文件流
in = MqPropertyUtil.class.getClassLoader().getResourceAsStream("mq.properties");
// 第二种，通过类进行获取properties文件流
// in = PropertyUtil.class.getResourceAsStream("/mq.properties");
props.load(in);
} catch (FileNotFoundException e) {
logger.error("jdbc.properties文件未找到");
} catch (IOException e) {
logger.error("出现IOException");
} finally {
try {
if (null != in) {
in.close();
}
} catch (IOException e) {
logger.error("jdbc.properties文件流关闭出现异常");
}
}
logger.info("加载properties文件内容完成...........");
logger.info("properties文件内容：" + props);
}

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

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