PHP和AJAX上传文件
写这篇文章主要是不要忘记，而且这种上传还很简单
第一步在视图页面引入两个JS。jquery.js 和 ajaxupload.js
<script type="text/javascript" src="<? echo URL_PATH; ?>static/admin/js/jquery-1.7.2.js"></script> <script type="text/javascript" src="<? echo URL_PATH; ?>static/admin/js/ajaxupload.js"></script>
第二步写个JS
<script type="text/javascript">
$(document).ready(function(){
//图片上传
new AjaxUpload('#select',{
action : '<?php echo URL_PATH . 'comm/upload_img'; ?>',
onSubmit : function(){
$("#select").attr("value","上传中...");
this.disable();
},
onComplete : function(file,ext){
alert(ext);
var obj=eval('('+ext+')');
if(obj.error==1){
alert(obj.url);
}
else{
$("#litpic").attr("value",obj.url);
}
$("#select").attr("value","上传");
this.enable();
}
}
);
});
</script>如果看不懂的可以网上搜索ajaxupload.js这个JS ，里面有详细的说明。
第三步在相应的处理上传文件的PHP文件中处里这个JS提交的action。这里我要介绍这个PHP上传类
class Uploader
{
private $fileField; //文件域名
private $file; //文件上传对象
private $config; //配置信息
private $oriName; //原始文件名
private $fileName; //新文件名
private $fullName; //完整文件名,即从当前配置目录开始的URL
private $UrlName; //文件名的URL形式
private $fileSize; //文件大小
private $fileType; //文件类型
private $stateInfo; //上传状态信息,
private $stateMap = array( //上传状态映射表，国际化用户需考虑此处数据的国际化
"SUCCESS" , //上传成功标记，在UEditor中内不可改变，否则flash判断会出错
"文件大小超出 upload_max_filesize 限制" ,
"文件大小超出 MAX_FILE_SIZE 限制" ,
"文件未被完整上传" ,
"没有文件被上传" ,
"上传文件为空" ,
"POST" => "文件大小超出 post_max_size 限制" ,
"SIZE" => "文件大小超出网站限制" ,
"TYPE" => "不允许的文件类型" ,
"DIR" => "目录创建失败" ,
"IO" => "输入输出错误" ,
"UNKNOWN" => "未知错误" ,
"MOVE" => "文件保存时出错"
);
/**
* 构造函数
* @param string $fileField 表单名称
* @param array $config 配置项
* @param bool $base64 是否解析base64编码，可省略。若开启，则$fileField代表的是base64编码的字符串表单名
*/
public function __construct( $fileField , $config , $base64 = false )
{
$this->fileField = $fileField;
$this->config = $config;
$this->stateInfo = $this->stateMap[ 0 ];
$this->upFile( $base64 );
}
/**
* 上传文件的主处理方法
* @param $base64
* @return mixed
*/
private function upFile( $base64 )
{
//处理base64上传
if ( "base64" == $base64 ) {
$content = $_POST[ $this->fileField ];
$this->base64ToImage( $content );
return;
}
//处理普通上传
$file = $this->file = $_FILES[ $this->fileField ];
if ( !$file ) {
$this->stateInfo = $this->getStateInfo( 'POST' );
return;
}
if ( $this->file[ 'error' ] ) {
$this->stateInfo = $this->getStateInfo( $file[ 'error' ] );
return;
}
if ( !is_uploaded_file( $file[ 'tmp_name' ] ) ) {
$this->stateInfo = $this->getStateInfo( "UNKNOWN" );
return;
}
$this->oriName = $file[ 'name' ];
$this->fileSize = $file[ 'size' ];
$this->fileType = $this->getFileExt();
if ( !$this->checkSize() ) {
$this->stateInfo = $this->getStateInfo( "SIZE" );
return;
}
if ( !$this->checkType() ) {
$this->stateInfo = $this->getStateInfo( "TYPE" );
return;
}
$this->fullName = $this->getFolder() . '/' . $this->getName();
$this->UrlName .= '/' . $this->fileName;
if ( $this->stateInfo == $this->stateMap[ 0 ] ) {
if ( !move_uploaded_file( $file[ "tmp_name" ] , $this->fullName ) ) {
$this->stateInfo = $this->getStateInfo( "MOVE" );
}
}
}
/**
* 处理base64编码的图片上传
* @param $base64Data
* @return mixed
*/
private function base64ToImage( $base64Data )
{
$img = base64_decode( $base64Data );
$this->fileName = time() . rand( 1 , 10000 ) . ".png";
$this->fullName = $this->getFolder() . '/' . $this->fileName;
if ( !file_put_contents( $this->fullName , $img ) ) {
$this->stateInfo = $this->getStateInfo( "IO" );
return;
}
$this->oriName = "";
$this->fileSize = strlen( $img );
$this->fileType = ".png";
}
/**
* 获取当前上传成功文件的各项信息
* @return array
*/
public function getFileInfo()
{
return array(
"originalName" => $this->oriName ,
"name" => $this->fileName ,
"baseName" => $this->fullName ,
"urlName" => $this->UrlName ,
"size" => $this->fileSize ,
"type" => $this->fileType ,
"state" => $this->stateInfo
);
}
/**
* 上传错误检查
* @param $errCode
* @return string
*/
private function getStateInfo( $errCode )
{
return !$this->stateMap[ $errCode ] ? $this->stateMap[ "UNKNOWN" ] : $this->stateMap[ $errCode ];
}
/**
* 重命名文件
* @return string
*/
private function getName()
{
return $this->fileName = time() . rand( 1 , 10000 ) . $this->getFileExt();
}
/**
* 文件类型检测
* @return bool
*/
private function checkType()
{
return in_array( $this->getFileExt() , $this->config[ "allowFiles" ] );
}
/**
* 文件大小检测
* @return bool
*/
private function checkSize()
{
return $this->fileSize <= ( $this->config[ "maxSize" ] * 1024 );
}
/**
* 获取文件扩展名
* @return string
*/
private function getFileExt()
{
return strtolower( strrchr( $this->file[ "name" ] , '.' ) );
}
/**
* 按照日期自动创建存储文件夹
* @return string
*/
private function getFolder()
{
$pathStr = $this->config[ "savePath" ];
if ( strrchr( $pathStr , "/" ) != "/" ) {
$pathStr .= "/";
}
$pathStr .= date( "Ymd" );
if ( !file_exists( $pathStr ) ) {
if ( !mkdir( $pathStr , 0777 , true ) ) {
return false;
}
}
$this->UrlName .= $this->config['saveUrl'] . date( "Ymd" );
return $pathStr;
}
}使用这个类用如下方式
//上传配置
$config = array(
"saveUrl" => URL_PATH . "attached/" ,
"savePath" => ROOT_PATH . "/attached/" , //保存路径
"allowFiles" => array('.gif', '.jpg', '.jpeg', '.png', '.bmp' ) , //文件允许格式
"maxSize" => 2000 //文件大小限制，单位KB
);
//生成上传实例对象并完成上传
$up = new Uploader( "userfile" , $config );
$info = $up->getFileInfo();
然后返回到AJAX的JS处理上传。