java应用开发和后台有什么区别，利用java开发的应用系统*台，怎样连接oracle数据库后台

java应用开发和后台有什么区别，搞 Java 最重要的是什么？毫不夸张地说，掌握和了解利用java开发的应用系统前台，怎样连接oracle数据库后台??，基本就能走遍天下都不怕了！

可以用jdbc连接，给你个连接的例子吧package day2;import ;import .;import .;import .*;public class { private static String url; private static String driver; private static String dbUser; private static String dbPwd; public static void init(){ try { //1.装载 fis = new ( new File("src/db_oracle.")); props = new (); (fis);//把输入流中的键值对数据装载到对象props中 //2.获取 url = props.("url"); driver = props.("driver"); dbUser = props.("dbUser"); dbPwd = props.("dbPwd"); } catch (Exception e) { e.(); } } public static (){ init(); conn = null; try{ (driver); conn = .(url,dbUser,dbPwd); }catch(Exception e){ e.(); } return conn; } public static void close( conn){ if (conn != null){ try { (); } catch ( e) { e.(); } } } public static void close(Statement stmt){ if (stmt != null){ try { (); } catch ( e) { e.(); } } } public static void close(ResultSet rs){ if (rs != null){ try { (); } catch ( e) { e.(); } } } }下面是db_oracle.# key = value# url = jdbc:oracle:thin:@ip:port:sidurl = jdbc:oracle:thin:@.26:1521: = . = = open123