下面通过一段代码给大家演示下，主要分为1.前台文件index.html和 2.后台文件upload.php。具体代码如下所示：
1.前台文件index.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<head>
<title>SWFUpload</title>
<link href="css/default.css" rel="stylesheet" type="text/css" />
<!--Swfupload插件begin-->
<script type="text/javascript" src="swfupload/swfupload.js"></script>
<script type="text/javascript" src="js/swfupload.queue.js"></script>
<script type="text/javascript" src="js/fileprogress.js"></script>
<script type="text/javascript" src="js/handlers.js"></script>
<!--Swfupload插件end-->
<script type="text/javascript">
var swfu;
window.onload = function() {
var settings = {
flash_url : "swfupload/swfupload.swf",
upload_url: "upload.php", // 后台文件
post_params: {"PHPSESSID" : "<?php echo session_id(); ?>"},
file_size_limit : "100 MB",
file_types : "*.*",
file_types_description : "All Files",
file_upload_limit : 100,
file_queue_limit : 0,
custom_settings : {
progressTarget : "fsUploadProgress",
cancelButtonId : "btnCancel"
},
debug: false,
// 按钮设置
button_image_url: "images/TestImageNoText_65x29.png", // Flash样式图片文件
button_width: "65",
button_height: "29",
button_placeholder_id: "spanButtonPlaceHolder",
button_text: '<span class="theFont">浏览</span>',
button_text_style: ".theFont { font-size: 16; }",
button_text_left_padding: 12,
button_text_top_padding: 3,
// 句柄设置
file_queued_handler : fileQueued,
file_queue_error_handler : fileQueueError,
file_dialog_complete_handler : fileDialogComplete,
upload_start_handler : uploadStart,
upload_progress_handler : uploadProgress,
upload_error_handler : uploadError,
upload_success_handler : uploadSuccess,
upload_complete_handler : uploadComplete,
queue_complete_handler : queueComplete
};
swfu = new SWFUpload(settings);
};
</script>
</head>
<body>
<div id="header">
<h1 id="logo"><a href="/">SWFUpload</a></h1>
<div id="version">v2.2.0</div>
</div>
<div id="content">
<form id="form1" action="index.php" method="post" enctype="multipart/form-data">
<p>点击“浏览”按钮，选择您要上传的文档文件后，系统将自动上传并在完成后提示您。</p>
<p>请勿上传包含中文文件名的文件！</p>
<div class="fieldset flash" id="fsUploadProgress">
<span class="legend">快速上传</span>
</div>
<div id="divStatus">0 个文件已上传</div>
<div>
<span id="spanButtonPlaceHolder"></span>
<input id="btnCancel" type="button" value="取消所有上传" onclick="swfu.cancelQueue();" disabled="disabled" style="margin-left: 2px; font-size: 8pt; height: 29px;" />
</div>
</form>
</div>
<div align="center">Hanization By <a href="http://imll.net" target="_blank">Leo.C,</a>
</div>
</body>
</html>
2.后台文件upload.php
<?php
// 传递session值（由于Flash与session不兼容，只能通过参数传递获取）
if (isset($_POST["PHPSESSID"])) {
session_id($_POST["PHPSESSID"]);
} else if (isset($_GET["PHPSESSID"])) {
session_id($_GET["PHPSESSID"]);
}
session_start();
// 设置POST最大值
$POST_MAX_SIZE = ini_get('post_max_size');
$unit = strtoupper(substr($POST_MAX_SIZE, -1));
$multiplier = ($unit == 'M' ? 1048576 : ($unit == 'K' ? 1024 : ($unit == 'G' ? 1073741824 : 1)));
if ((int)$_SERVER['CONTENT_LENGTH'] > $multiplier*(int)$POST_MAX_SIZE && $POST_MAX_SIZE) {
header("HTTP/1.1 500 Internal Server Error");
echo "POST exceeded maximum allowed size.";
exit(0);
}
// 基本设置
$save_path = getcwd() . "/file/"; // 文件上传位置
$upload_name = "Filedata";
$max_file_size_in_bytes = 2147483647; // 2GB
$extension_whitelist = array("doc", "txt", "jpg", "gif", "png"); // 允许文件类型
$valid_chars_regex = '.A-Z0-9_ !@#$%^&()+={}[]',~`-'; // 文件名规则
// 其他变量
$MAX_FILENAME_LENGTH = 260;
$file_name = "";
$file_extension = "";
$uploadErrors = array(
0=>"文件上传成功",
1=>"上传的文件超过了 php.ini 文件中的 upload_max_filesize directive 里的设置",
2=>"上传的文件超过了 HTML form 文件中的 MAX_FILE_SIZE directive 里的设置",
3=>"上传的文件仅为部分文件",
4=>"没有文件上传",
6=>"缺少临时文件夹"
);
// 检测文件是否上传正确
if (!isset($_FILES[$upload_name])) {
HandleError("No upload found in $_FILES for " . $upload_name);
exit(0);
} else if (isset($_FILES[$upload_name]["error"]) && $_FILES[$upload_name]["error"] != 0) {
HandleError($uploadErrors[$_FILES[$upload_name]["error"]]);
exit(0);
} else if (!isset($_FILES[$upload_name]["tmp_name"]) || !@is_uploaded_file($_FILES[$upload_name]["tmp_name"])) {
HandleError("Upload failed is_uploaded_file test.");
exit(0);
} else if (!isset($_FILES[$upload_name]['name'])) {
HandleError("File has no name.");
exit(0);
}
// 检测文件尺寸
$file_size = @filesize($_FILES[$upload_name]["tmp_name"]);
if (!$file_size || $file_size > $max_file_size_in_bytes) {
HandleError("File exceeds the maximum allowed size");
exit(0);
}
if ($file_size <= 0) {
HandleError("File size outside allowed lower bound");
exit(0);
}
// 检测文件名字为空
$file_name = preg_replace('/[^'.$valid_chars_regex.']|.+$/i', "", basename($_FILES[$upload_name]['name']));
if (strlen($file_name) == 0 || strlen($file_name) > $MAX_FILENAME_LENGTH) {
HandleError("Invalid file name");
exit(0);
}
// 检测重名文件
if (file_exists($save_path . $file_name)) {
HandleError("File with this name already exists");
exit(0);
}
// 检测后缀名
$path_info = pathinfo($_FILES[$upload_name]['name']);
$file_extension = $path_info["extension"];
$is_valid_extension = false;
foreach ($extension_whitelist as $extension) {
if (strcasecmp($file_extension, $extension) == 0) {
$is_valid_extension = true;
break;
}
}
if (!$is_valid_extension) {
HandleError("Invalid file extension");
exit(0);
}
// 保存文件
if (!@move_uploaded_file($_FILES[$upload_name]["tmp_name"], $save_path.$file_name)) {
HandleError("文件无法保存.");
exit(0);
}
// 成功输出
echo "File Received";
exit(0);
function HandleError($message) {
header("HTTP/1.1 500 Internal Server Error");
echo $message;
}
?>
以上代码就是实现文件上传之SwFUpload插件的全部内容，希望大家喜欢。