Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
            String url="jdbc:oracle:thin:@localhost:1521:orcl"; //orcl为数据库的SID
            String user="test";
            String password="test";
            Connection conn= DriverManager.getConnection(url,user,password);

Class.forName("com.ibm.db2.jdbc.app.DB2Driver ").newInstance();
            String url="jdbc:db2://localhost:5000/sample"; //sample为你的数据库名
            String user="admin";
            String password="";
            Connection conn= DriverManager.getConnection(url,user,password);

Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
            String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb";
            //mydb为数据库
            String user="sa";
            String password="";
            Connection conn= DriverManager.getConnection(url,user,password);

Class.forName("com.sybase.jdbc.SybDriver").newInstance();
            String url =" jdbc:sybase:Tds:localhost:5007/myDB";//myDB为你的数据库名
            Properties sysProps = System.getProperties();
            SysProps.put("user","userid");
            SysProps.put("password","user_password");
            Connection conn= DriverManager.getConnection(url, SysProps);

Class.forName("com.informix.jdbc.IfxDriver").newInstance();
            String url = "jdbc:informix-sqli://123.45.67.89:1533/myDB:INFORMIXSERVER=myserver;
            user=testuser;password=testpassword"; //myDB为数据库名
            Connection conn= DriverManager.getConnection(url);

Class.forName("org.gjt.mm.mysql.Driver").newInstance();
            //或者Class.forName("com.mysql.jdbc.Driver");
            String url ="jdbc:mysql://localhost/myDB?
            user=soft&password=soft1234&useUnicode=true&characterEncoding=8859_1"
            //myDB为数据库名
            Connection conn= DriverManager.getConnection(url);

Class.forName("org.postgresql.Driver").newInstance();
            String url ="jdbc:postgresql://localhost/myDB" //myDB为数据库名
            String user="myuser";
            String password="mypassword";
            Connection conn= DriverManager.getConnection(url,user,password);

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver") ;
            String url="jdbc:odbc:Driver={MicroSoft Access Driver
            (*.mdb)};DBQ="+application.getRealPath("/Data/ReportDemo.mdb");
            Connection conn = DriverManager.getConnection(url,"","");
            Statement stmtNew=conn.createStatement() ;