以properties方式来联接数据库
1：在WEB工程SEC目录下新建一个database.properties文件，里面保存连接数据库信息2：public class DBUtil { private String driver; private String url; private String user; private String psw; private static DBUtil dbutil=null; private DBUtil() throws IOException, ClassNotFoundException{ InputStream is=this.getClass().getClassLoader().getResourceAsStream("database.properties"); Properties p=new Properties(); p.load(is); driver=p.getProperty("driver"); url=p.getProperty("url"); user=p.getProperty("user"); psw=p.getProperty("psw"); Class.forName(driver); } /** * 获得数据库帮助类唯一实例 */ synchronized public static DBUtil getInstance() throws IOException, ClassNotFoundException{ if(dbutil==null){ dbutil=new DBUtil(); } return dbutil; } /** * 获取数据库连接 无参数 */ synchronized public Connection getConnection() throws SQLException{ return DriverManager.getConnection(url,user,psw); }