java中常量文件的配置与读取

java中常量文件的配置与读取：

 package com.floor.shop.user.util;

 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Properties;

 /**
  * 课程笔记:http://www.cnblogs.com/newAndHui/category/1153640.html
  * 疑问咨询wx:851298348
  */
 public class ConfigMapUtil {
     private static Map<String, String> map = new HashMap<>();

     static {
         try {
             //读取文件流
             InputStream resourceAsStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("config.properties");
             //转变为字符流
             InputStreamReader inputStreamReader = new InputStreamReader(resourceAsStream,"utf-8");
             //创建 Properties 对象
             Properties properties = new Properties();
            // prop.load(new InputStreamReader(in, "utf-8"));
             //加载字符流
             properties.load(inputStreamReader);
             //获取所有key
             Enumeration enumeration = properties.propertyNames();
             while (enumeration.hasMoreElements()) {
                 //遍历key
                 String key = (String) enumeration.nextElement();
                 //根据key取值
                 String value = properties.getProperty(key);
                 //放入map中
                 map.put(key, value);
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
     public static String getShopWx() {
         return map.get("shop.wx");
     }
     public static String getValueByKey(String key) {
         return map.get(key);
     }

     public static Map<String, String> getMap() {
         return map;
     }

     public static void setMap(Map<String, String> map) {
         ConfigMapUtil.map = map;
     }

 }

3.测试：