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：