js实现图片上传预览
图片裁剪，预览，上传保存的功能。这个功能一般用于会员中心的图片。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <body> <input type=file name="doc" id="doc" onchange="javascript:setImagePreview();"> <p> <div id="localImag"><img id="preview" width=-1 height=-1 style="diplay:none" /></div> </p> <script> function setImagePreview() { var docObj=document.getElementById("doc"); var imgObjPreview=document.getElementById("preview"); if(docObj.files && docObj.files[0]){ //火狐下，直接设img属性 imgObjPreview.style.display = 'block'; imgObjPreview.style.width = '300px'; imgObjPreview.style.height = '120px'; //imgObjPreview.src = docObj.files[0].getAsDataURL(); //火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式 imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]); }else{ //IE下，使用滤镜 docObj.select(); var imgSrc = document.selection.createRange().text; var localImagId = document.getElementById("localImag"); //必须设置初始大小 localImagId.style.width = "300px"; localImagId.style.height = "120px"; //图片异常的捕捉，防止用户修改后缀来伪造图片 try{ localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)"; localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc; }catch(e){ alert(""); return false; } imgObjPreview.style.display = 'none'; document.selection.empty(); } return true; } </script> </body> </html> php上传缩略图
<form method="post" action="suo_do.php" enctype="multipart/form-data"> <input type="file" name="pic" /> <input type="submit" value="上传1" /> </form> <?php header("content-type:text/html;charset=gbk"); ini_set("date.timezone","Asia/chong"); //判断文件是否为空 if(empty($_FILES)){ echo"上传文件过大"; exit; } //判断文件上传是否有错误 if($_FILES['pic']['error']){ echo "上传文件"; exit; } //判断文件类型是否非法获取文件后缀 $allowtype=array("jpg","png","jpeg","gif"); $a=explode('.',$_FILES['pic']['name']); $index=count($a)-1; $ex=strtolower($a[$index]); if(!in_array($ex,$allowtype)){ echo "上传文件非法"; exit; } $file=date('YmdHis').rand().".".$ex; $src=$_FILES['pic']['tmp_name']; $des="upload/".$file; $rs=move_uploaded_file($src,$des); //缩略图 //读取已经上传图片 $image=imagecreatefromjpeg($des); $a=getimagesize($des); $w=$a[0]; $h=$a[1]; if($w>$h){ $width=300; $height=$width/$w*$h; }else if($w<$h){ $height=300; $width=$height/$h*$w; }else{ $width=300; $height=300; } //创建空白新图片 $newimage=imagecreatetruecolor($width, $height); //copy源图片内容 copy新图片 imagecopyresized($newimage, $image, 0,0, 0,0, $width, $height, $w, $h); $filename="upload/s_".$file; imagejpeg($newimage,$filename); php图片上传
<?php header('content-type:text/html;charset=gbk'); /****************************************************************************** 参数说明: $max_file_size : 上传文件大小限制, 单位BYTE $destination_folder : 上传文件路径 $watermark : 是否附加水印(1为加水印,其他为不加水印); 使用说明: 1. 将PHP.INI文件里面的"extension=php_gd2.dll"一行前面的;号去掉,因为我们要用到GD库; 2. 将extension_dir =改为你的php_gd2.dll所在目录; ******************************************************************************/ //上传文件类型列表 $uptypes=array( 'image/jpg', 'image/jpeg', 'image/png', 'image/pjpeg', 'image/gif', 'image/bmp', 'image/x-png' ); $max_file_size=2000000; //上传文件大小限制, 单位BYTE $destination_folder="uploadimg/"; //上传文件路径 $watermark=1; //是否附加水印(1为加水印,其他为不加水印); $watertype=1; //水印类型(1为文字,2为图片) $waterposition=1; //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中); $waterstring="这是水印"; //水印字符串 $waterimg="xplore.gif"; //水印图片 $imgpreview=1; //是否生成预览图(1为生成,其他为不生成); $imgpreviewsize=1/2; //缩略图比例 ?> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gbk" /> <title>ZwelL图片上传程序</title> <style type="text/css"> <!-- body { font-size: 9pt; } input { background-color: #66CCFF; border: 1px inset #CCCCCC; } --> </style> </head> <body> <form enctype="multipart/form-data" method="post" name="upform"> 上传文件: <input name="upfile" type="file"> <input type="submit" value="上传"><br> 允许上传的文件类型为:<?=implode(', ',$uptypes)?> </form> <?php if ($_SERVER['REQUEST_METHOD'] == 'POST') { if (!is_uploaded_file($_FILES["upfile"][tmp_name])) //是否存在文件 { echo "图片不存在!"; exit; } $file = $_FILES["upfile"]; if($max_file_size < $file["size"]) //检查文件大小 { echo "文件太大!"; exit; } if(!in_array($file["type"], $uptypes)) //检查文件类型 { echo "文件类型不符!".$file["type"]; exit; } if(!file_exists($destination_folder)) { mkdir($destination_folder); } $filename=$file["tmp_name"]; $image_size = getimagesize($filename); $pinfo=pathinfo($file["name"]); $ftype=$pinfo['extension']; $destination = $destination_folder.time().".".$ftype; if (file_exists($destination) && $overwrite != true) { echo "同名文件已经存在了"; exit; } if(!move_uploaded_file ($filename, $destination)) { echo "移动文件出错"; exit; } $pinfo=pathinfo($destination); $fname=$pinfo[basename]; echo " <font color=red>已经成功上传</font><br>文件名: <font color=blue>".$destination_folder.$fname."</font><br>"; echo " 宽度:".$image_size[0]; echo " 长度:".$image_size[1]; echo "<br> 大小:".$file["size"]." bytes"; if($watermark==1) { $iinfo=getimagesize($destination,$iinfo); $nimage=imagecreatetruecolor($image_size[0],$image_size[1]); $white=imagecolorallocate($nimage,255,255,255); $black=imagecolorallocate($nimage,0,0,0); $red=imagecolorallocate($nimage,255,0,0); imagefill($nimage,0,0,$white); switch ($iinfo[2]) { case 1: $simage =imagecreatefromgif($destination); break; case 2: $simage =imagecreatefromjpeg($destination); break; case 3: $simage =imagecreatefrompng($destination); break; case 6: $simage =imagecreatefromwbmp($destination); break; default: die("不支持的文件类型"); exit; } imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size[1]); imagefilledrectangle($nimage,1,$image_size[1]-15,80,$image_size[1],$white); switch($watertype) { case 1: //加水印字符串 imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black); break; case 2: //加水印图片 $simage1 =imagecreatefromgif("xplore.gif"); imagecopy($nimage,$simage1,0,0,0,0,85,15); imagedestroy($simage1); break; } switch ($iinfo[2]) { case 1: //imagegif($nimage, $destination); imagejpeg($nimage, $destination); break; case 2: imagejpeg($nimage, $destination); break; case 3: imagepng($nimage, $destination); break; case 6: imagewbmp($nimage, $destination); //imagejpeg($nimage, $destination); break; } //覆盖原上传文件 imagedestroy($nimage); imagedestroy($simage); } if($imgpreview==1) { echo "<br>图片预览:<br>"; echo "<img src=\"".$destination."\" width=".($image_size[0]*$imgpreviewsize)." height=".($image_size[1]*$imgpreviewsize); echo " alt=\"图片预览:\r文件名:".$destination."\r上传时间:\">"; } } ?> </body> </html> 来自：http://blog.csdn.net/phpfenghuo/article/details/21080609