验证过表单之后如何将数据写入SQL数据库，急急急急急急急！！！！

jsp(表单)把值传到servlet然后servlet调用插入语句.搞定!
//***************insertdao (数据访问层)****************//
public class Examedao{
private static Logger logger=Logger.getLogger(Examedao.class);
private Examedto dto;
public Examedao(){

}
public void execute()throws SQLException{
DBConn dBConn=new DBConn();
try{
java.sql.Connection conn=dBConn.getConn();
Examedao dao=new Examedao();
String str="insert into vehicle values(?,?,?,?)";
logger.debug("语句"+str);
java.sql.preparedStatement ps=new preparedStatement(str);
ps.setString (1,dto.getvecode());
......
ps.setString (4,dto.gettype());
ps.execute();
logger.debug("");

}finally{
dBConn.close();
}
}
}
//***************servlet ****************//
try{
String code=request.getparameter("txtid")//得到jsp页面txt的值
.......
String type=request.getparameter("txtt