5 ways to read resource files in Java

https://www.cnblogs.com/EasonJim/p/6517653.html#autoid-0-0-0

package com.zkn.newlearn.others;

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

import com.zkn.newlearn.gof.singleton.SimpleFactoryTest01;

/**
 * Five ways to read resource files
 * @author zkn
 */

public class ClassReadResourceDemo {

	public static void main(String[] args) {
		/**
		 * The first way uses the class loader to read the resource file.
		 * Applicable situation: Resource files and class files can be in different directories.
		 * Note: The parameters in getResourceAsStream must be
		 * Fully qualified path to write resource file, package name + file name
		 * Do not write "/" at the beginning
		 */
		InputStream is = ClassReadResourceDemo.class.
				getClassLoader().getResourceAsStream("com/zkn/newlearn/io/config.properties");
		Properties prop = new Properties();
		try {
			prop.load(is);
			System.out.println(prop.getProperty("key"));
			is.close();
		} catch (IOException e) {
			e.printStackTrace ();
		}
		/**
		 * The second way of writing: use class.getResourceAsStream() (in fact, the class loader is still used)
		 * Applicable situation: If the resource file and the class file are in the same package, just write the name of the resource file directly.
		 * Note: There is no need to add "/" before the name of the resource file
		 */
		is = ClassReadResourceDemo.class.getResourceAsStream("config.properties");
		try {
			prop.load(is);
			System.out.println(prop.getProperty("key"));
			is.close();
		} catch (IOException e) {
			e.printStackTrace ();
		}
		/**
		 * The third way of writing: use class.getResourceAsStream() (in fact, the class loader is still used)
		 * Applicable situation: This writing method is applicable when the resource file and the class file are not in the same directory
		 * Note: Be sure to add "/" at the beginning
		 */
		is = ClassReadResourceDemo.class.getResourceAsStream("/com/zkn/newlearn/io/config.properties");
		try {
			prop.load(is);
			System.out.println(prop.getProperty("key"));
			is.close();
		} catch (IOException e) {
			e.printStackTrace ();
		}
		/**
		 * The fourth way of writing: use class.getResourceAsStream()
		 * Applicable situation: This writing method is suitable for the case where the resource file is in the root directory
		 * Note: Be sure to add "/" before the file name
		 */
		is = ClassReadResourceDemo.class.getResourceAsStream("/config.properties");
		try {
			prop.load(is);
			System.out.println(prop.getProperty("key"));
			is.close();
		} catch (IOException e) {
			e.printStackTrace ();
		}
		/**
		 * The fifth way of writing: use the class loader to read the resource file
		 * Applicable situation: The resource file is in the following directory
		 * Note: Do not add "/" before the resource file name
		 */
		is = ClassReadResourceDemo.class.getClassLoader().getResourceAsStream("config.properties");
		try {
			prop.load(is);
			System.out.println(prop.getProperty("key"));
			is.close();
		} catch (IOException e) {
			e.printStackTrace ();
		}
	}
}