加载 properties 的几种方法

1.通过Resources 拿（放在resources文件夹）

Properties p = new Properties();

p = Resources.getResourceAsProperties("jdbc.properties");

2.

通过流 来拿   p.load(in);

InputStream in = Thread.currentThread()
                            .getContextClassLoader()
                            .getResourceAsStream("jdbc.properties");
            p.load(in);

 2.2  FIleInuptStresm

//InputStream in =  new  FileInputStream("jdbc.properties");//不行
		InputStream in =  new  FileInputStream("resources/jdbc.properties");//行
		p.load(in);

　2.3

源码

package com.seehope._03_util;

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

public class PropertiesDemo {
    public static void main(String[] args) throws Exception{
        Properties p = new Properties();
        
        /*1.通过流来拿，那应该会指定一个路径
        InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream("jdbc.properties");
        p.load(in);
        */
        
        /* 2.
        //InputStream in =  new  FileInputStream("jdbc.properties");//不行
        InputStream in =  new  FileInputStream("resources/jdbc.properties");// 行
        p.load(in);
        */
        InputStream in = PropertiesDemo.class
                .getClassLoader().
                getResourceAsStream("test/jdbc.properties");
        //scr 文件夹下面的 test 包下的 jdbc.properties
        p.load(in);
        
        
        String  className = p.getProperty("DriverClassName");
        System.out.println(className);
        String url = p.getProperty("url");
        System.out.println(url);
    }
    
}

　　

输出

com.mysql.jdbc.Driver
jdbc:mysql://localhost:3306/jdbc

更多参见   https://blog.csdn.net/u013301376/article/details/78341914