java反射问题，求指教

数据表：
Create database News
go
use News
go
Create table UserInfo
(
Id int identity(1,1)primary key,
username varchar(20),
pwd varchar(20),
createTime date
)

package nan;



import java.util.ArrayList;

import java.util.List;

import java.lang.reflect.*;

import java.sql.*;

//flashFXP访问；Server-u:建ftp服务器的



public class MetaDataTest<T> {

	public List<T>generalSearch(String sql,Object[]args,String className){

		//存储返回的集合对象

		List<T>list=new ArrayList<T>();

		

		Connection con=DaoFactory.getConnection();

		PreparedStatement pstmt=null;

		ResultSet rs=null;

		

		//使用反射获取类的信息；

		try {

			Class<T>clazz=(Class<T>)Class.forName(className);

			Field[]fields=clazz.getDeclaredFields();

			Method method=null;

			

			pstmt=con.prepareStatement(sql);

			rs=pstmt.executeQuery();

			ResultSetMetaData resmd=null;

			resmd=rs.getMetaData();

			int columncount=resmd.getColumnCount();

			

			while(rs.next()){

				T obj=clazz.newInstance();//实例化

				for(int i=1;i<=columncount;i++){

					String cname=resmd.getColumnName(i);

					int ctype=resmd.getColumnType(i);

					for(Field f:fields){

						if(cname.equals(f.getName())){

							//封装数据

							String firstLetter=f.getName().substring(0,1).toUpperCase();

							String methodName="set"+firstLetter+f.getName().substring(1);

							//如果列是整型的

							if(ctype==Types.INTEGER){

								//System.out.println(methodName);

								//System.out.println(rs.getInt(i));

								//method=clazz.getMethod(methodName, Integer.class);

								//method.invoke(obj, rs.getInt(i));

							}

							//else if(ctype==Types.VARCHAR){

//								method=clazz.getMethod(methodName, String.class);

//								method.invoke(obj, rs.getString(i));

//							}else if(ctype==Types.TIMESTAMP){

//								method=clazz.getMethod(methodName, Date.class);

//								method.invoke(obj, rs.getDate(i));

//							}else if(ctype==Types.NUMERIC){

//								method=clazz.getMethod(methodName,Double.class);

//								method.invoke(obj, rs.getDouble(i));

//							}							

						}

					}

					list.add(obj);

				}

			}

		} catch (Exception e) {

			e.printStackTrace();

		}

		return list;

	}

}

package nan;



import java.util.List;





public class TestMD {

	public static void main(String[] args) {

		

		String sql="select * from userinfo";

		MetaDataTest mdt=new MetaDataTest<UserInfo>();

		List<UserInfo>list=mdt.generalSearch(sql, null,UserInfo.class.getName());

		System.out.println("ID\t姓名\t密码");

		for(UserInfo user:list){

			System.out.println(user.getId()+"\t"+

					user.getUsername()+"\t"+

					user.getPwd()+"\t");

		}

	}

}

报错是类型不匹配，请高手指教是哪方面的问题？？？实体类省略了