各种数据库连接的例子

1.Oracle(用thin模式)数据库
    驱动："oracle.jdbc.driver.OracleDriver";
    Url：jdbc:oracle:thin:@<host>:<port>:<SID>; 
    String UserName = "username";  //用户名
    String Password = "password";  //密码
    Class.forName(驱动).newInstance();
    connection con = DriverManager.getConnection(Url,Username,Password);

2.DB2
    驱动："com.ibm.db2.jcc.DB2Driver";
    Url："jdbc:db2://<host>:<port>/<database_name>";
    String UserName = "username";
    String Password = "password";
    Class.forName(驱动).newInstance();
    connection con = DriverManager.getConnection(Url,UserName,Password);

3.MySQL数据库
    驱动："com.mysql.jdbc.Driver";
    Url："jdbc:mysql://<host>:<port>/<database_name>";
    String UserName="username";
    String Password="password";
    Class.forName(驱动).newInstance();  //加载数据库驱动
    connection con = DriverManager.getConnection(Url,Username,Password);

4.Microsoft SQL server 数据库
    SQL Server 2000:
    驱动： "com.microsoft.jdbc.sqlserver.SQLServerDriver";
    Url："jdbc:microsoft:sqlserver://localhost:1433; DatabaseName=sample";
    SQL Server 2005:
    驱动： "com.microsoft.sqlserver.jdbc.SQLServerDriver";
    Url："jdbc:sqlserver://<host>:<port>;databaseName=<database_name>"; 
    String UserName="username";
    String Password="password";
    Class.forName(驱动).newInstance();
    connection con=DriverManager.getConnection(Url,Username,Password);

参考文章：
  http://blog.youkuaiyun.com/ring0hx/article/details/6152528