详解如何把dedecms数据生成json

{dede:json url='http://news/json.php' cache=300}
[field:id/]-[field:title/]<br/>
{/dede:json}

<?php
$cfg_NotPrintHead = false;
header("Content-Type: text/html; charset=utf-8");
include_once (dirname(__FILE__)."/../include/common.inc.php");
error_reporting(E_ALL || ~E_NOTICE);
require_once(DEDEINC.'/json.class.php');
$reval = array();
$dsql->SetQuery("SELECT id,title FROM `dede_archives` ORDER BY id DESC LIMIT 0,10");
$dsql->Execute('me');
while ($row = $dsql->GetArray('me')) {
$row['title'] = gb2utf8($row['title']);
$reval[] = $row;
}
$json = new Services_JSON(SERVICES_JSON_SUPPRESS_ERRORS);
echo $json->encode($reval);

?>