怎么样通过thinkphp3.2实现图片上传？

public function file()
{
 $baseUrl = str_replace('\\', '/', dirname($_SERVER['SCRIPT_NAME']));
 import('ORG.Net.UploadFile');
 import('ORG.Util.Services_JSON');
 $upload = new UploadFile();
 $upload->maxSize = 3145728;
 $upload->allowExts = array('jpg', 'gif', 'png', 'jpeg');
 $upload->savePath = './uploads/Images/';
 $info = $upload->uploadOne($_FILES['imgFile']);
 $file_url = $baseUrl . 'uploads/Images/' . $info['0']['savename'];
 if ($info) {
  header('Content-type: text/html; charset=UTF-8');
  $json = new Services_JSON();
  echo $json->encode(array('error' => 0, 'url' => $file_url));
  exit;
 } else {
  $this->error($upload->getErrorMsg());
 }
}
public function file_manager()
{
 import('ORG.Util.Services_JSON');
 $php_path = dirname(__FILE__) . '/';
 $php_url = dirname($_SERVER['PHP_SELF']) . '/';
 $root_path = $php_path . './uploads/Images/';
 $root_url = $php_url . './uploads/Images/';
 $ext_arr = array('gif', 'jpg', 'jpeg', 'png', 'bmp');
 $dir_name = emptyempty($_GET['dir']) ? '' : trim($_GET['dir']);
 if (!in_array($dir_name, array('', 'image', 'flash', 'media', 'file'))) {
  echo "Invalid Directory name.";
  exit;
 }
 if ($dir_name !== '') {
  $root_path .= $dir_name . "/";
  $root_url .= $dir_name . "/";
  if (!file_exists($root_path)) {
  mkdir($root_path);
  }
 }
//根据path参数，设置各路径和URL
 if (emptyempty($_GET['path'])) {
  $current_path = realpath($root_path) . '/';
  $current_url = $root_url;
  $current_dir_path = '';
  $moveup_dir_path = '';
 } else {
  $current_path = realpath($root_path) . '/' . $_GET['path'];
  $current_url = $root_url . $_GET['path'];
  $current_dir_path = $_GET['path'];
  $moveup_dir_path = preg_replace('/(.*?)[^\/]+\/$/', '$1', $current_dir_path);
 }
 echo realpath($root_path);
//排序形式，name or size or type
 $order = emptyempty($_GET['order']) ? 'name' : strtolower($_GET['order']);
//不允许使用..移动到上一级目录
 if (preg_match('/\.\./', $current_path)) {
  echo 'Access is not allowed.';
  exit;
 }
//最后一个字符不是/
 if (!preg_match('/\/$/', $current_path)) {
  echo 'Parameter is not valid.';
  exit;
 }
//目录不存在或不是目录
 if (!file_exists($current_path) || !is_dir($current_path)) {
  echo 'Directory does not exist.';
  exit;
 }
//遍历目录取得文件信息
 $file_list = array();
 if ($handle = opendir($current_path)) {
  $i = 0;
  while (false !== ($filename = readdir($handle))) {
  if ($filename{0} == '.') continue;
  $file = $current_path . $filename;
  if (is_dir($file)) {
   $file_list[$i]['is_dir'] = true; //是否文件夹
   $file_list[$i]['has_file'] = (count(scandir($file)) > 2); //文件夹是否包含文件
   $file_list[$i]['filesize'] = 0; //文件大小
   $file_list[$i]['is_photo'] = false; //是否图片
   $file_list[$i]['filetype'] = ''; //文件类别，用扩展名判断
  } else {
   $file_list[$i]['is_dir'] = false;
   $file_list[$i]['has_file'] = false;
   $file_list[$i]['filesize'] = filesize($file);
   $file_list[$i]['dir_path'] = '';
   $file_ext = strtolower(pathinfo($file, PATHINFO_EXTENSION));
   $file_list[$i]['is_photo'] = in_array($file_ext, $ext_arr);
   $file_list[$i]['filetype'] = $file_ext;
  }
  $file_list[$i]['filename'] = $filename; //文件名，包含扩展名
  $file_list[$i]['datetime'] = date('Y-m-d H:i:s', filemtime($file)); //文件最后修改时间
  $i++;
  }
  closedir($handle);
 }
//排序
 usort($file_list, 'cmp_func');
 $result = array();
//相对于根目录的上一级目录
 $result['moveup_dir_path'] = $moveup_dir_path;
//相对于根目录的当前目录
 $result['current_dir_path'] = $current_dir_path;
//当前目录的URL
 $result['current_url'] = $current_url;
//文件数
 $result['total_count'] = count($file_list);
//文件列表数组
 $result['file_list'] = $file_list;
//输出JSON字符串
 header('Content-type: application/json; charset=UTF-8');
 $json = new Services_JSON();
 echo $json->encode($result);
}