1.properties文件位置的关系：当properties文件放在src目录下时，编译会自动把src里的文件放到bin文件平级，因此可用this.getClass.getClassLoader.getResourceAsStream(fileName)读取，当把properties文件放到包里时，则应加相应的包路径，如：

props.load(Test.class.getClassLoader().getResourceAsStream("abc.properties"));

package wang.hhtp;import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;public class PropertiesUtils
{private static PropertiesUtils propertiesUtils=null;private static Map<String,String> proMap=new HashMap<String,String>();private PropertiesUtils(){        InputStream inputStream=null;try {Properties pro=new Properties();inputStream =getClass().getClassLoader().getResourceAsStream("abc.properties");pro.load(inputStream);Iterator ite=pro.keySet().iterator();while(ite.hasNext()){String key=(String) ite.next();String value=pro.getProperty(key);proMap.put(key, value);}} catch (IOException e) {e.printStackTrace();}finally{try {inputStream.close();} catch (IOException e) {e.printStackTrace();}}}public static PropertiesUtils getInstance(){if(propertiesUtils ==null){propertiesUtils=new PropertiesUtils();}return propertiesUtils;}public String getValue(String key){PropertiesUtils pro= PropertiesUtils.getInstance();if(StringUtils.isNotBlank(key)){String value=pro.proMap.get(key);return value;}return key;}
}

class Properties{private static Properties props = new Properties();static {try {props.load(Test.class.getClassLoader().getResourceAsStream("com/abc.properties"));} catch (Exception e) {e.printStackTrace();}}public static String getProperty(String key){return  props.getProperty(key);}
}