php+html5实现无刷新图片上传教程，
php+html5实现无刷新图片上传教程，
本篇向大家介绍一种全新的上传图片的方式，利用html5的FileReader读取图片文件，然后将数据传输到服务器再使用PHP进行处理。实现过程如下（带图片预览功能）
前端html代码 upload,html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>上传</title>
<script type="text/javascript" src="js/jquery.min.js"></script>
<style>
.upload{
width:300px;
height:200px;
position:relative;
}
.upload input[type='file']{
position:absolute;
width:70px;
top:0;
left:0;
z-index:10;
opacity:0;
filter:alpha(opacity=0);
}
.upload input.selbutton{
width:70px;
height:30px;
background:#cf001b;
color:#FFF;
font-size:14px;
position:absolute;
top:0;left:0;
z-index:9;
border:none;
cursor:pointer;
}
.upload input.upbutton{
width:70px;
height:30px;
background:#cf001b;
color:#FFF;
font-size:14px;
position:absolute;
top:50px;left:0;
z-index:10;
border:none;
cursor:pointer;
}
</style>
</head>
<body>
<div class='upload'>
<input type="file" name="file" />
<input type="button" name="selbutton" class="selbutton" value="选择文件" />
<input type="button" name="upbutton" class="upbutton" value="上传" />
</div>
<div class='previews'>
<img class="image_thumb lazy" src="/static/imghw/default1.png" data-src="#" alt="图片预览"/>
</div>
</body>
</html>
样式如下图
接下来是js代码
<script type="text/javascript">
$(".upbutton").click(function(){
//定义允许上传的图片格式 在前台就可以直接判断，不合法的格式将不会上传
var filetype = ['jpg','jpeg','png','gif'];
if($('.image').get(0).files){
fi = $('.image').get(0).files[0]; //得到文件信息
//判断文件格式是否是图片 如果不是图片则返回false
var fname = fi.name.split('.');
if(filetype.indexOf(fname[1].toLowerCase()) == -1){
alert('文件格式不支持');
return ;
}
//实例化h5的fileReader
var fr = new FileReader();
fr.readAsDataURL(fi); //以base64编码格式读取图片文件
fr.onload = function(frev){
pic = frev.target.result; //得到结果数据
//开始上传之前，预览图片
$('.image_thumb').attr('src',pic);
//使用ajax 利用post方式提交数据
$.post(
'handle.php',
{
message:pic,
filename:fname[0],
filetype:fname[1],
filesize:fi.size
},
function(data){
data = eval('('+data+')');
if(data.code == 1 || data.code == 2){
console.log('上传失败')
}else if(data.code == 0){
console.log('上传成功')
}
}
);
}
}
})
</script>
接下来是PHP处理代码 handle.php
$imgtype = array(
'gif'=>'gif',
'png'=>'png',
'jpg'=>'jpeg',
'jpeg'=>'jpeg'
); //图片类型在传输过程中对应的头信息
$message = $_POST['message']; //接收以base64编码的图片数据
$filename = $_POST['filename']; //接收文件名称
$ftype = $_POST['filetype']; //接收文件类型
//首先将头信息去掉，然后解码剩余的base64编码的数据
$message = base64_decode(substr($message,strlen('data:image/'.$imgtype[strtolower($ftype)].';base64,')));
$filename = $filename.".".$ftype;
$furl = "D:/now/";
//开始写文件
$file = fopen($furl.$filename,"w");
if(fwrite($file,$message) === false){
echo json_encode(array('code'=>1,'con'=>'failed'));
exit;
}
echo json_encode(array('code'=>0,'con'=>$filename));
选择文件然后点击上传的效果如下图
以上就是整个图片上传的代码。当然对于PHP的部分还有很多可以优化的地方，比如文件名部分，可以重命名，以保证相同文件名上传以后的文件名是不同的等等。这种上传方式我也是刚开始使用，当初是受Node.js做上传的的启发，然后尝试着应用于PHP，没想到还真能上传成功。
希望大家也可以按照此方法实现图片上传。
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