java类读取properties文件

package com.bshinfo.el.userInfo.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

public class SystemConfigUtil {

private static SystemConfigUtil systemConfigUtil = null;

private static Map<String, String> proMap = new HashMap<String, String>();

private SystemConfigUtil() {

Properties pro = new Properties();

try {
            pro.load(new InputStreamReader(SystemConfigUtil.class.getClassLoader().getResourceAsStream("xxx.properties"), "UTF-8"));//根目录下

Enumeration e = pro.propertyNames();

while (e.hasMoreElements()) {

String key = (String) e.nextElement();

String value = (String) pro.get(key);

proMap.put(key, value);

}

} catch (IOException e) {

e.printStackTrace();

}

}

public static SystemConfigUtil getInstance() {

if (systemConfigUtil == null) {

systemConfigUtil = new SystemConfigUtil();

}

return null;

}

public static Map<String, String> getProMap() {

return proMap;

}

public static void main(String[] args) {

// 写一个main方法，来验证一下

SystemConfigUtil systemConfigUtil = SystemConfigUtil.getInstance();

SystemConfigUtil systemConfigUtil2 = SystemConfigUtil.getInstance();

System.out.println(systemConfigUtil == systemConfigUtil2);

Map m1 = systemConfigUtil.getProMap();

Map m2 = systemConfigUtil2.getProMap();

System.out.println(m1 == m2);

System.out.println(m1.get("test"));
        System.out.println(m1.get("燃油值班员"));

}

}