[JDBC] How to find classes implemented java.sql.Drvier in JDBC Driver jar file.(JDBC 드라이버 Jar 파일에서 Drvier Class 찾기)

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public static java.util.List< String> findDriverClassNamesInJars( java.io.File[] jarFiles) throws FileNotFoundException, IOException { java.util.jar.JarInputStream jarFileInputStream = null; java.util.jar.JarEntry jarEntry = null; java.net.URLClassLoader ucl = null; java.net.URL url = null; ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); Class< ?> baseInClass = java.sql.Driver.class; java.util.List< String> classNames = new java.util.ArrayList< String>(); for ( int ll = 0; ll < jarFiles.length; ll++) { url = new java.net.URL( "jar:file:" + jarFiles[ ll] + "!/"); ucl = new URLClassLoader( new java.net.URL[] { url }, classLoader); try { jarFileInputStream = new java.util.jar.JarInputStream( new java.io.FileInputStream( jarFiles[ ll])); while ( ( jarEntry = jarFileInputStream.getNextJarEntry()) != null) { if ( jarEntry.getName().endsWith( ".class")) { String classname = jarEntry.getName().replaceAll( "/", "\\."); classname = classname.substring( 0, classname.length() - 6); if ( !classname.contains( "$")) { try { final Class< ?> myLoadedClass = Class.forName( classname, true, ucl); if ( baseInClass.isAssignableFrom( myLoadedClass)) { classNames.add( myLoadedClass.getName()); } } catch ( Exception e) { continue; } catch ( Error e) { continue; } } } } } finally { try { jarFileInputStream.close(); } catch ( Exception e) {} } } return classNames; }