java 实现web项目启动加载properties属性文件

<!-- Properties文件的监听器 -->
    <listener>
        <description>ServletContextListener</description>
        <listener-class>com.lvqutour.utils.PropertyFileUtils</listener-class>
    </listener>

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
 
/**
 * Created with IntelliJ IDEA.
 * Date: 2018/3/13 13:06
 * User: pc
 * Description:自定义properties文件读取工具类
 */
 
public class PropertyFileUtils implements ServletContextListener {
    private static Properties prop = new Properties();
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        InputStream inputStream;
        try {
            inputStream = getClass().getResourceAsStream("/XXX.properties");
            if(inputStream != null){
                prop.load(inputStream);
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
 
    @Override
    public void contextDestroyed(ServletContextEvent sce) {  
    }
 
    public static String get(String params){
        return prop.getProperty(params);
    }
}

#微信支付相关 
#密钥
KEY = longshengwenhuaweixiangmingWXpay
#连接超时时间（毫秒）
CONNECT_TIME_OUT = 10000

String key = PropertyFileUtils.get("KEY");//密钥
int CONNECT_TIME_OUT = Integer.parseInt(PropertyFileUtils.get("CONNECT_TIME_OUT"));//连接超时时间

@Value("${KEY}")
private String key;//密钥
@Value("${CONNECT_TIME_OUT}")
private int CONNECT_TIME_OUT;//连接超时时间