JDBC读取查询结果的字段

//先获取ResultSet
ResultSet rs = ps.executeQuery(); 
ResultSetMetaData rsmd = rs.getMetaData(); //通过ResultSetMetaData获取字段
if (rsmd != null) { 
    int count = rsmd.getColumnCount(); 
    for (int i = 1; i <= count; i++) { 
        System.out.println("hyqTest======" + rsmd.getColumnName(i)); 
    rsmd.getColumnType(i); 
}