怎样写一个通用的JDBC查询方法

Connection conn = getConnection();
List list = new ArrayList();
try{
Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery(SQL);

ResultSetMetaData md = rs.getMetaData();

int columnCount = md.getColumnCount();

while (rs.next()) {

Map map = new HashMap();

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

map.put(md.getColumnName(i), rs.getObject(i));

}

list.add(map);

}

}catch(SQLException e)
{
e.printStackTrace();
}

return list;
我自己写的，不管什么SQL，都可以查询获取到一个list，如何取list，我想不是这个主题的内容

public static Object get(Class clazz,String sql,Object[] pars)
{
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
Object obj = null;

//获得数据库连接