php ajax无刷新上传图片与图片下载功能的实现代码如下所示：

<meta charset="utf-8" > <form id= "uploadForm"> <p >指定文件名： <input type="text" name="filename" value= ""/></p > <p> 上传文件： <input type="file" name="photo" onchange="showPreview(this)" class="file" /> <img id="portrait" src="" width="70" height="75"> </p> <input type="button" value="上传" onclick="doUpload()" /> </form> <script src="http://www.haoyunyun.cn/jquery.js"></script> <script> function doUpload() { var formData = new FormData($( "#uploadForm" )[0]); $.ajax({ url: 'submit.php' , type: 'POST', data: formData, async: false, cache: false, contentType: false, processData: false, success: function (returndata) { alert(returndata); }, error: function (returndata) { alert(returndata); } }); } </script> <script type="text/javascript"> function showPreview(source) { var file = source.files[0]; if (window.FileReader) { var fr = new FileReader(); fr.onloadend = function(e) { document.getElementById("portrait").src = e.target.result; }; fr.readAsDataURL(file); } } </script>

submit.php

<?php if($_FILES['photo']['error']>0){ echo "上传文件失败"; die; } $dir='./photo/'; $type=substr($_FILES['photo']['name'],strrpos($_FILES['photo']['name'],'.')); $filename=time().rand(1000,9999).$type; if(is_uploaded_file($_FILES['photo']['tmp_name'])){ move_uploaded_file($_FILES['photo']['tmp_name'],$dir.$filename); echo "上传成功"; }else{ echo "上传文件失败"; }

遍历数据库数据

<?php header("content-type:text/html;charset=utf-8"); $link=mysql_connect("127.0.0.1",'root','root'); mysql_select_db("php9",$link); mysql_query("set names utf8"); //查询数据中的总条数 $sql="select count(id) as count from upload"; $arr=mysql_query($sql); $result=mysql_fetch_assoc($arr); //获得总条数 $size=$result['count']; //每页显示2条数据 $length=6; //计算出多少页 $pages=ceil($size/$length); $page=isset($_GET['page'])?$_GET['page']:1; if($page<=0){ $page=1; } if($page>$pages){ $page=$pages; } //数据从第几条开始 $start=($page-1)*$length; $sql="select * from upload limit $start,$length"; $res=mysql_query($sql); ?> <center> <table border="1"> <div> <?php while($a=mysql_fetch_assoc($res)){ ?> <ul> <li><?php echo $a['id'] ?></li> <li><?php echo $a['username'] ?></li> <li><a href="photo.php" rel="external nofollow" ><img src="<?php echo $a['dir'] ?>" width="80px" ></a> </li> <li><?php echo $a['desc1'] ?></li> <li> <a href="photo3.php?dir=<?php echo $a['dir'] ?>" rel="external nofollow" >下载</a> <a href="photo4.php?id=<?php echo $a['id'] ?> && dir=<?php echo $a['dir'] ?>" rel="external nofollow" >删除</a> </li> </ul> <?php } ?> </div> </table> <a href="photo2.php?page=1" rel="external nofollow" >首页</a> <a href="photo2.php?page=<?php echo $page-1 ?>" rel="external nofollow" >上一页</a> <a href="photo2.php?page=<?php echo $page+1 ?>" rel="external nofollow" >下一页</a> <a href="photo2.php?page=<?php echo $pages ?>" rel="external nofollow" >尾页</a> </center> <style> *{ margin: 0; padding: 0; } div{ width:900px; height: 850px; border: 1px solid #28a4c9; margin: auto; } img{ width: 200px; height: 130px; margin-left: 100px; } ul{ width: 400px; height: 300px; float: left; } li{ list-style: none; margin-left: 10px; } </style>

下载代码

<?php header("content-type:text/html;charset=utf-8"); $dir=$_GET['dir']; $filename=substr($dir,strrpos($dir,'/')+1); header("Content-type:image"); header("content-disposition:attachment;filename=$filename"); readfile($dir); ?>

以上所述是小编给大家介绍的PHP中ajax无刷新上传图片与图片下载功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！