读取properties配置文件

读取properties配置文件如下:

package conf;

import java.io.InputStream;
import java.util.Properties;

public class ReadProp {
	public static void main(String[] args){
		String fileName = "/conf/msf.properties";
		Properties props = new Properties();
		try{
			InputStream in = ReadProp.class.getResourceAsStream(fileName);
			props.load(in);
			System.out.println(props.getProperty("renderer.class"));
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}

原来getResourceAsStream(String name)中,
name要么是以 "/" 开始的相对路径(相对当前类所在的包);
要么是绝对路径(类似"D:/code/j2se/src/conf/msf.properties")
.难怪刚开始我写成这样
String fileName = "conf/msf.properties";
一直报java.lang.NullPointerException