java反射问题，求指教

[teayear]

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

[大山-小浩子]

这个问题不会