$allowedExtensions = array("jpeg", "jpg", "bmp", "png");
$sizeLimit = 10 * 1024 * 1024;
$uploader = new qqFileUploader($allowedExtensions, $sizeLimit);
$result = $uploader->handleUpload('uploads/'); //folder for uploaded files
echo htmlspecialchars(json_encode($result), ENT_NOQUOTES);
allowExtensions则定义了允许上传文件的格式.
sizeLimit上限定义为10M.注意首先采用Phpinfo()；方法输出当前php环境配置.一般默认情况默认上传文件最大大小为2M.如果你需要上传更大则修改php.ini文件配置参数 这里不再赘述.
uploder则是初始化qq.Fileuploder对象.并加载配置.
fineuploder调用处理上传函数.并传递服务器端存储上传文件存储路径.
echo想服务器端输出上传结果.必须.不然客户端接受不到指定responseJason参数用来判断上传后状态.
在进一步看看服务器端如何处理上传的找到handleUpload函数定义.
复制代码 代码如下:
/**
* Handle the uploaded file
* @param string $uploadDirectory
* @param string $replaceOldFile=true
* @returns array('success'=>true) or array('error'=>'error message')
*/
function handleUpload($uploadDirectory, $replaceOldFile = FALSE){
if (!is_writable($uploadDirectory)){
return array('error' => "Server error. Upload directory isn't writable.");
}
if (!$this->file){
return array('error' => 'No files were uploaded.');
}
$size = $this->file->getSize();
if ($size == 0) {
return array('error' => 'File is empty');
}
if ($size > $this->sizeLimit) {
return array('error' => 'File is too large');
}
$pathinfo = pathinfo($this->file->getName());
$filename = $pathinfo['filename'];
//$filename = md5(uniqid());
$ext = @$pathinfo['extension'];// hide notices if extension is empty
if($this->allowedExtensions && !in_array(strtolower($ext), $this->allowedExtensions)){
$these = implode(', ', $this->allowedExtensions);
return array('error' => 'File has an invalid extension, it should be one of '. $these . '.');
}
$ext = ($ext == '') ? $ext : '.' . $ext;
if(!$replaceOldFile){
/// don't overwrite previous files that were uploaded
while (file_exists($uploadDirectory . DIRECTORY_SEPARATOR . $filename . $ext)) {
$filename .= rand(10, 99);
}
}
$this->uploadName = $filename . $ext;
if ($this->file->save($uploadDirectory . DIRECTORY_SEPARATOR . $filename . $ext)){
return array('success'=>true);
} else {
return array('error'=> 'Could not save uploaded file.' .
'The upload was cancelled, or server error encountered');
}
}
在调用这个处理函数时.需要注意的是.传递的URL存储路径需要时绝对的.所以需要对传入路劲做一下格式化处理:
$uploadDirectory = $_SERVER['DOCUMENT_ROOT']."DS".$uploadDirectory;
对于is_writeable文件是否可写的判断.我个人认为还不够详细.is_writeable主要判断文件或目录是否存在.并可写才会返回true. 所以个人建议在is_writable前添加一个文件是否存在.这样更易于在客户端判断服务器端文件出错具体的情况:
复制代码 代码如下:
if (!file_exists($uploadDirectory)) {
return array('error' => "Server error. Upload directory dones't exist.");
}
在保存文件操作前.可以看到.处理函数分别做了四次判断.分别判断了 上传文件的数量、文件上传的大小、文件上传大小是否超过上限、另外在上传过程.如果我们多次想服务器端上传同一个文件.发现Fine Uploder处理方式是.并非是重写.而是从10-99随机一个数字重写命名该文件.并保存到目录下.当保存文件成功后.则想服务器端返回一个Json数据其中包含IsSuccess来指定此次上传操作是否操作成功. IsSuccess参数作为客户端判断此时操作唯一参数.
在上传操作过程发信很多出现“increase post_max_size and upload_max_filesize to 10M”错误，其实针对这个问题.主要是上传文件配置超过php环境默认的2M.需要在php.ini文件中把post_max_size和upload_max_filesize两项的值改到10M以上，然后重启Apache即可.或是参考Php官网针对配置说明 修改php.ini配置文件.
至此整个Fine Uploader配置流程已经全部完成.点击选择文件时.会如下效果:
提示上传成功.当然更多的请参考官方给出演示demo.如上从Fine Uploader源码角度分析其实现原理.
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