1.可以通過 類名.class.getResource方法獲取或者getSystemResource

2.可以通過當前線程 Thread.currentThread().getContextClassLoader().getResource獲取

public class TestDemo {

public static void main(String[] args) throws FileNotFoundException, IOException {

Properties pro=new Properties();

TestDemo test=new TestDemo();

pro.setProperty("url", "localhost:8080");

pro.setProperty("username", "root");

pro.setProperty("password", "123");

String filepath="G:/util/";

//pro.store(new FileOutputStream(new File("db.properties")), "資 源配置");

File file =new File(filepath);

if(!file.exists()){

file.mkdir();

}

File realpath=new File(file,"db.properties");

if(!realpath.exists()){

realpath.createNewFile();

}

//寫入properties文件

pro.store(new FileOutputStream(realpath), "properties配置");

File xmlpath=new File(file,"db.xml");

if(!xmlpath.exists()){

xmlpath.createNewFile();

}

//寫入xml文件中

pro.storeToXML(new FileOutputStream(xmlpath), "xml配置");

//加載配置文件

Properties pro1=new Properties();

// pro1.load(TestDemo.class.getClassLoader().getResourceAsStream("test/db.properties"));

//獲取文件的相對路徑

//1.可以通過 類名。class.getResource方法獲取或者getSystemResource

//2.可以通過當前線程 Thread.currentThread().getContextClassLoader()。getResource獲取

pro1.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("test/db.properties"));

System.out.println(TestDemo.class.getResource("/test/db.properties"));

System.out.println(Thread.currentThread().getContextClassLoader().getResource("test/db.properties"));

//System.out.println(Thread.currentThread().getContextClassLoader().getSystemResource("test/db.properties"));

System.out.println(test.getClass().getClassLoader().getResourceAsStream("test/db.properties"));

System.out.println(TestDemo.class.getResource("/"));//斜杠代表從根路徑 開始

System.out.println(TestDemo.class.getResource(""));//空格代表當前類的相對路徑開始

System.out.println(Thread.currentThread().getContextClassLoader().getResource(""));//空格代表從根路徑開始

String str= pro1.getProperty("password", "沒找到");

System.out.println(str);

} }