Several ways to load properties in Java

1. Use the load () method of the Java.util.Properties class (note: jdbc.properties If this file is loaded in this way, it must be placed under the classpath or it will not load)

        InputStream InputStream = new Bufferedinputstream (New   FileInputStream (New File ("Jdbc.properties"));        Properties Properties =new properties ();        Properties.load (InputStream);        System.out.println (Properties.get ("Jdbc.url"));

2. Use the Getbundle () method of the Java.util.ResourceBundle class (note: The file's write does not have a suffix name for the file )

            ResourceBundle RB = Resourcebundle.getbundle ("jdbc", Locale.getdefault ());            enumeration<string> keys = Rb.getkeys ();            while (Keys.hasmoreelements ()) {                  string key = (string) keys.nextelement ();                  System.out.println (rb.getstring (key));           }

3. Use the constructor of the Java.util.PropertyResourceBundle class

        InputStream InputStream = new Bufferedinputstream (New FileInputStream ("Src/jdbc.properties"));        ResourceBundle bundle =new propertyResourceBundle (inputstream);        System.out.println (bundle.getstring ("Jdbc.url"));

4. Using the Getsystemresourceasstream () static method of the Java.lang.ClassLoader class

         InputStream InputStream = Classloader.getsystemresourceasstream ("jdbc.properties");          Properties Properties =new properties ();         Properties.load (InputStream);         System.out.println (Properties.get ("Jdbc.url"));

5. getResourceAsStream () method of Java.lang.ClassLoader obtained using Class.getclassloader ()

         InputStream InputStream = JDBCProperties.class.getClassLoader (). getResourceAsStream ("Jdbc.properties");         Properties Properties =new properties ();         Properties.load (InputStream);         System.out.println (Properties.get ("Jdbc.url"));

6. Using the Getsystemresourceasstream () static method of the Java.lang.ClassLoader class

         InputStream InputStream = JDBCProperties.class.getResourceAsStream ("/jdbc.properties");         Properties Properties =new properties ();         Properties.load (InputStream);         System.out.println (Properties.get ("Jdbc.url"));

7. The Javax.servlet.ServletContext getResourceAsStream () method can be used in a servlet

       InputStream in = context.getresourceasstream (path);       Properties P = new properties ();       P.load (in);

　　

Several ways to load properties in Java