Java method to read the properties file

This article illustrates how Java can read the properties file. Share with you for your reference. The specific implementation method is as follows:

package com.test.demo; 
import java.util.Properties;   
import java.io.InputStream;   
import java.io.IOException;   
   
public final class TestProperties {   
  private static String param1;   
  private static String param2;  
  private static String param3; 
  private static String param4; 
  /** 
   *  For the pathnames of the configuration files above, there is a problem that is easy to ignore,  
   *  That's when you use Object.class.getClassLoader().get... The time, 
   *  You don't have to add" / ",  
   *  But don't getClassLoader(). I can't. What's the reason?  
   *  Because this configuration file is placed in the project src , in object When you load it, you add" / ".  
   *  If you want to copy this configuration file to the same package as the class, you don't need to add, 
   *  If the configuration file is read in the following way:  
   */ 
  static {   
    Properties prop = new Properties();   
    //InputStream in = Object.class.getResourceAsStream("/test.properties");
    //The file is under SRC
    //InputStream in = TestProperties.class.getClassLoader().getResourceAsStream("jdbc.properties");
    //The file is under SRC
    InputStream in = TestProperties.class.getResourceAsStream("jdbc.properties");
    //The files are in the same package
    try {   
      prop.load(in);   
      param1 = prop.getProperty("mysql.driverClassName").trim();   
      param2 = prop.getProperty("mysql.url").trim();  
      param3 = prop.getProperty("mysql.username").trim();  
      param4 = prop.getProperty("mysql.password").trim();  
    } catch (IOException e) {   
      e.printStackTrace();   
    }   
  }   
     
  private TestProperties() {   
  }   
  public static String getParam1() {   
    return param1;   
  }   
  public static String getParam2() {   
    return param2;   
  }   
  public static String getParam3() { 
    return param3; 
  } 
  public static String getParam4() { 
    return param4; 
  } 
  public static void main(String args[]){   
    System.out.println(getParam1());   
    System.out.println(getParam2());  
    System.out.println(getParam3()); 
    System.out.println(getParam4()); 
  }   
}

I hope this article has been helpful to your Java programming.