java中常量文件的配置與讀取

java中常量文件的配置與讀取：

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;

/**
 * 課程筆記:http://www.cnblogs.com/newAndHui/category/1153640.html
 * 疑問咨詢wx:851298348
 */
public class ConfigMapUtil {
    private static Map<String, String> map = new HashMap<>();

    static {
        try {
            //讀取文件流
            InputStream resourceAsStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("config.properties");
            //轉變為字符流
            InputStreamReader inputStreamReader = new InputStreamReader(resourceAsStream,"utf-8");
            //創建 Properties 對象
            Properties properties = new Properties();
           // prop.load(new InputStreamReader(in, "utf-8"));
            //加載字符流
            properties.load(inputStreamReader);
            //獲取所有key
            Enumeration enumeration = properties.propertyNames();
            while (enumeration.hasMoreElements()) {
                //遍歷key
                String key = (String) enumeration.nextElement();
                //根據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.測試：