引用
1、Oracle8/8i/9i数据库（thin模式） 

    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);

    2、DB2数据库 

    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);

     3、Sql Server7.0/2000数据库 

    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);

    4、Sybase数据库 

    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);

    5、Informix数据库 

    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);

    6、MySQL数据库 

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

    7、PostgreSQL数据库 

    Class.forName("com.mysql.jdbc.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);