搜索
首页php教程php手册PHP文件上传及下载源码,

PHP文件上传及下载源码,

Jun 13, 2016 am 08:38 AM
doctypehhtmlphp上传下载文件源码页面

PHP文件上传及下载源码,

  一、文件上传

  前台页面:

<span><!</span><span>DOCTYPE html</span><span>></span>
<span><</span><span>html</span><span>></span>
<span><</span><span>head</span><span>></span>
    <span><</span><span>meta </span><span>charset</span><span>="utf-8"</span><span>></span>
    <span><</span><span>title</span><span>></span>文件上传<span></</span><span>title</span><span>></span>
<span></</span><span>head</span><span>></span>
<span><</span><span>body</span><span>></span>
<span><</span><span>div</span><span>></span>
    <span><</span><span>form </span><span>method</span><span>="post"</span><span> action</span><span>="upload.php"</span><span> enctype</span><span>="multipart/form-data"</span> <span>></span><span>
        用户名</span><span><</span><span>input </span><span>type</span><span>="text"</span><span> name</span><span>="username"</span><span>></</span><span>input</span><span>></span>
        <span><</span><span>br</span><span>></span><span>
        文件简单介绍</span><span><</span><span>br</span><span>><</span><span>textarea </span><span>name</span><span>="fileintro"</span><span> rows</span><span>="8"</span><span> cols</span><span>="50"</span><span>></</span><span>textarea</span><span>></span>
        <span><</span><span>br</span><span>></span>选择要上传的文件<span><</span><span>br</span><span>><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfile"</span><span>></</span><span>input</span><span>><</span><span>br</span><span>></span>
        <span><</span><span>input </span><span>type</span><span>="submit"</span><span> value</span><span>="上传文件"</span><span>></</span><span>input</span><span>></span>
    <span></</span><span>form</span><span>></span>
<span></</span><span>div</span><span>></span>
<span></</span><span>body</span><span>></span>
<span></</span><span>html</span><span>></span>

  后台处理:

<?<span>php
</span><span>//</span><span>接收提交页面传送的相关信息</span>
<span>$name</span> = <span>$_POST</span>['username'<span>];
</span><span>$intro</span> = <span>$_POST</span>['fileintro'<span>];
</span><span>//</span><span>$_FILES中存放着文件的相关信息
// echo "<pre class="brush:php;toolbar:false">";
// print_r($_FILES);
// echo "
"; //可以在这里对文件大小进行限制 /*$filesize = $_FILES['myfile']['size']; if($filesize>2*1024*1024){ echo "文件过大,不能上传"; exit(); }*/ //可以对文件类型进行限制 /*$filetype = $_FILES['myfile']['type']; if($filetype!='image/jpg'&&$filetype!='application/pdf'){ echo "文件类型只能是jpg和pdf"; exit(); }*/ if (is_uploaded_file($_FILES['myfile']['tmp_name'])) { //把文件转存到你希望存放的目录 $uploaded = $_FILES['myfile']['tmp_name']; //每个用户动态创建一个文件夹 $userpath = $_SERVER['DOCUMENT_ROOT']."/up/".$name; //判断该用户是否已经有文件夹 if(!file_exists($userpath)){ mkdir($userpath); } //防止同一用户上传同名文件,可在文件中添加时间戳。 //$moveto = $userpath."/".time().$_FILES['myfile']['name']; //或者对文件名进行修改,但是需要使用字符串处理截得文件后缀名 $truename = $_FILES['myfile']['name']; $moveto = $userpath."/".time().substr($truename,strrpos($truename,".")); if(move_uploaded_file($uploaded,iconv("utf-8", "gb2312", $moveto))){ echo "上传文件".$_FILES['myfile']['name']."成功"; }else{ echo "上传文件".$_FILES['myfile']['name']."失败"; } }else{ echo "上传文件".$FILES['myfile']['name']."失败"; } ?>

  二、文件下载:

  单文件下载:

 <?<span>php
    </span><span>function</span> down_file(<span>$file_name</span>,<span>$file_path</span><span>){
    </span><span>//</span><span>$file_name = iconv("uft-8","gb2312",$file_name);    //如果文件名是中文,需要对中文名称转码gb2312
    //要下载的文件读取到服务器的内存中
    //服务器返回文件数据给浏览器
    //浏览器将文件写入用户指定的位置
    //1.判断文件是否存在</span>
    <span>if</span>(!<span>file_exists</span>(<span>$file_name</span><span>)){
        </span><span>echo</span> "111"<span>;
        </span><span>return</span><span> ;
    }
    </span><span>$fp</span> = <span>fopen</span>(<span>$file_name</span>,"r"<span>);
    </span><span>$file_size</span> = <span>filesize</span>(<span>$file_name</span><span>);
    </span><span>//</span><span>获取文件大小
    //可通过file_size限制浏览器下载文件大小。
    //返回的文件</span>
    <span>header</span>("Content-type:application/octet-stream"<span>);
    </span><span>//</span><span>按字节大小返回</span>
    <span>header</span>("Accept-Ranges:bytes"<span>);
    </span><span>//</span><span>返回文件大小</span>
    <span>header</span>("Accept-Length:<span>$file_size</span>"<span>);
    </span><span>//</span><span>客户端弹出对话框,对应的文件名</span>
    <span>header</span>("Content-Disposition:attachment;filename=".<span>$file_name</span><span>);
    </span><span>$buffer</span> = 1024<span>;  
    </span><span>//</span><span>定义缓冲区
    //为了下载的安全,最好使用文件字节读取计数器</span>
    <span>$file_count</span> = 0<span>;
    </span><span>//</span><span>feof用于判断文件是否读取到文档尾</span>
    <span>while</span>(!<span>feof</span>(<span>$fp</span>) && (<span>$file_size</span>-<span>$file_count</span>>0<span>)){
    </span><span>$file_data</span> = <span>fread</span>(<span>$fp</span>,<span>$buffer</span><span>);
    </span><span>//</span><span>统计读了多少个字节</span>
    <span>$file_count</span>+<span>$buffer</span><span>;
    </span><span>echo</span> <span>$file_data</span><span>;   
    </span><span>//</span><span>把部分数据会送给浏览器</span>
<span>    }
    </span><span>fclose</span>(<span>$fp</span><span>);
    </span><span>//</span><span>关闭文件</span>
<span>    }
</span>?>

  多个文件下载:

  DownList.php:

<a href="downprocess.php?filename=1.jpg">down</a><img  src="/static/imghwm/default1.png"  data-src="1.jpg"  class="lazy"    style="max-width:90%" height="50px" alt="PHP文件上传及下载源码," ><br><br>
<a href="downprocess.php?filename=2.jpg">down</a><img  src="/static/imghwm/default1.png"  data-src="2.jpg"  class="lazy"    style="max-width:90%" height="50px" alt="PHP文件上传及下载源码," ><br><br>
<a href="downprocess.php?filename=3.jpg">down</a><img  src="/static/imghwm/default1.png"  data-src="3.jpg"  class="lazy"    style="max-width:90%" height="50px" alt="PHP文件上传及下载源码," ><br><br>
<a href="downprocess.php?filename=4.jpg">down</a><img  src="/static/imghwm/default1.png"  data-src="4.jpg"  class="lazy"    style="max-width:90%" height="50px" alt="PHP文件上传及下载源码," ><br><br>

  downprocess.php:

<?<span>php
    </span><span>$filename</span> = <span>$_REQUEST</span>['filename'<span>];
    </span><span>function</span> down_file(<span>$file_name</span><span>){

    </span><span>if</span>(!<span>file_exists</span>(<span>$file_name</span><span>)){
        </span><span>echo</span> "111"<span>;
        </span><span>return</span><span> ;
    }
    </span><span>$fp</span> = <span>fopen</span>(<span>$file_name</span>,"r"<span>);
    </span><span>$file_size</span> = <span>filesize</span>(<span>$file_name</span><span>);
    </span><span>header</span>("Content-type:application/octet-stream"<span>);
    </span><span>//</span><span>按字节大小返回</span>
    <span>header</span>("Accept-Ranges:bytes"<span>);
    </span><span>//</span><span>返回文件大小</span>
    <span>header</span>("Accept-Length:<span>$file_size</span>"<span>);
    </span><span>//</span><span>客户端弹出对话框,对应的文件名</span>
    <span>header</span>("Content-Disposition:attachment;filename=".<span>$file_name</span><span>);
    </span><span>$buffer</span> = 1024<span>;  
    </span><span>//</span><span>定义缓冲区</span>
    <span>$file_count</span> = 0<span>;
    </span><span>//</span><span>feof用于判断文件是否读取到文档尾</span>
    <span>while</span>(!<span>feof</span>(<span>$fp</span>) && (<span>$file_size</span>-<span>$file_count</span>>0<span>)){
        </span><span>$file_data</span> = <span>fread</span>(<span>$fp</span>,<span>$buffer</span><span>);
        </span><span>//</span><span>统计读了多少个字节</span>
        <span>$file_count</span>+<span>$buffer</span><span>;
        </span><span>echo</span> <span>$file_data</span><span>;   
        </span><span>//</span><span>把部分数据会送给浏览器</span>
<span>        }
    </span><span>fclose</span>(<span>$fp</span><span>);
    }
    down_file(</span><span>$filename</span><span>);
</span>?>

 

声明
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系admin@php.cn

热AI工具

Undresser.AI Undress

Undresser.AI Undress

人工智能驱动的应用程序,用于创建逼真的裸体照片

AI Clothes Remover

AI Clothes Remover

用于从照片中去除衣服的在线人工智能工具。

Undress AI Tool

Undress AI Tool

免费脱衣服图片

Clothoff.io

Clothoff.io

AI脱衣机

Video Face Swap

Video Face Swap

使用我们完全免费的人工智能换脸工具轻松在任何视频中换脸!

热工具

VSCode Windows 64位 下载

VSCode Windows 64位 下载

微软推出的免费、功能强大的一款IDE编辑器

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

功能强大的PHP集成开发环境

螳螂BT

螳螂BT

Mantis是一个易于部署的基于Web的缺陷跟踪工具,用于帮助产品缺陷跟踪。它需要PHP、MySQL和一个Web服务器。请查看我们的演示和托管服务。

记事本++7.3.1

记事本++7.3.1

好用且免费的代码编辑器

mPDF

mPDF

mPDF是一个PHP库,可以从UTF-8编码的HTML生成PDF文件。原作者Ian Back编写mPDF以从他的网站上“即时”输出PDF文件,并处理不同的语言。与原始脚本如HTML2FPDF相比,它的速度较慢,并且在使用Unicode字体时生成的文件较大,但支持CSS样式等,并进行了大量增强。支持几乎所有语言,包括RTL(阿拉伯语和希伯来语)和CJK(中日韩)。支持嵌套的块级元素(如P、DIV),