先来个请求页面fileupload.html
Administration - upload new files
Upload new news files
Upload this file:
然后程序逻辑处理 php文件
<h1> Uploading file... </h1>
<?php //Check to see if an error code was generated on the upload attempt
if ($_FILES[ 'userfile'][ 'error']>0)
{
echo 'Problem: ';
switch ($_FILES['userfile']['error']) {
case 1: echo 'File exceeded upload_max_filesize'; break;
case 2: echo 'File exceededmax_file_size'; break;
case 3: echo 'File only partially uploaded'; break;
case 4: echo 'No file uploaded'; break;
case 6: echo 'Cannot upload file: No temp directory specified.'; break;
case 7: echo 'Upload failed: Cannotwrite to disk.'; break;
}
exit; } // Does the file have the right MIME
type? if ($_FILES['userfile']['type'] != 'text/plain') {
echo 'Problem: file is not plain text'; exit; } // put the file where we'd like it $upfile
= '/uploads/'.$_FILES['userfile']['name']; if (is_uploaded_file($_FILES['userfile']['tmp_name']))
{ if (!move_uploaded_file($_FILES['userfile']['tmp_name'], $upfile)) {
echo 'Problem: Could not move file to destination directory'; exit; } }
else { echo 'Problem: Possible file upload attack. Filename: '; echo $_FILES['userfile']['name'];
exit; } echo 'File uploaded successfully
<br>
<br>
'; // reformat the file contents $fp = fopen($upfile, 'r'); $contents
= fread ($fp, filesize ($upfile)); fclose ($fp); $contents = strip_tags($contents);
$fp = fopen($upfile, 'w'); fwrite($fp, $contents); fclose($fp); // show
what was uploaded echo 'Preview of uploaded file contents:<br><hr>
'; echo $contents; echo ' <br> <hr>'; ?>
</body>
最后一步： 文件下载
$filePath = "template/";//此处给出你下载的文件在服务器的什么地方
$fileName = "template.xls";
//此处给出你下载的文件名
$file = fopen($filePath . $fileName, "r"); // 打开文件
//输入文件标签
Header("Content-type:application/octet-stream ");
Header("Accept-Ranges:bytes ");
Header("Accept-Length: " . filesize($filePath . $fileName));
Header("Content-Disposition: attachment; filename= " . $fileName);
// 输出文件内容
echo fread($file, filesize($filePath . $fileName));
fclose($file);
exit;
?>
总的来说，上面的3个代码段只是简单介绍了php文件的上传下载，还有很多问题要解决，就例如上传大文件的时候怎么处理，批量上传、大文件下载等等问题。
当然要优化的地方很多，原理如上
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