Jquery+AJAX实现无刷新上传并重命名文件操作示例【PHP后台接收】

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index.html

复制代码

<!DOCTYPE html>
<html>
<head>
  <title>Ajax上传图片</title>
  <meta charset="utf-8">
  <script src="https://www.jq22.com/jquery/jquery-3.3.1.js"></script>
</head>
<body>
  <h1>Ajax上传图片</h1>
  
  <form id="form" enctype="multipart/form-data">
    <input type="file" id="fileAttach" name="file"/>
    <input type="button" onclick="upload()" value="上传"/>
  </form>

<h2 id="upload-result"></h2>

<div id="imgdiv"></div>

<script>
    function upload(){
      var form = new FormData(document.getElementById("form"));
      $.ajax({
        url:"upload.php",
        type:"post",
        data:form,
        cache: false,
        processData: false,
        contentType: false,
        success:function(data){
          if (data.res == "400") {
            $("#upload-result").text("上传成功");
            $("#imgdiv").html("<img src="upload/"+data.path+""/>");
          }else if (data.res == "403") {
            $("#upload-result").text("格式不对");
          }else if (data.res == "404") {
            $("#upload-result").text("上传错误");
          }
          
        },
        error:function(data){
          alert("上传失败")
        }
      })
    }
  </script>
</body>
</html>

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<!DOCTYPE html>
<html>
<head>
  <title>Ajax上传图片</title>
  <meta charset="utf-8">
  <script src="https://www.jq22.com/jquery/jquery-3.3.1.js"></script>
</head>
<body>
  <h1>Ajax上传图片</h1>
  <!-- 表单 -->
  <form id="form" enctype="multipart/form-data">
    <input type="file" id="fileAttach" name="file"/>
    <input type="button" onclick="upload()" value="上传"/>
  </form>

  <!-- 显示结果 -->
  <h2 id="upload-result"></h2>

  <!-- 显示图片 -->
  <div id="imgdiv"></div>

  <!-- Ajax上传 -->
  <script>
    function upload(){
      var form = new FormData(document.getElementById("form"));
      $.ajax({
        url:"upload.php",
        type:"post",
        data:form,
        cache: false,
        processData: false,
        contentType: false,
        success:function(data){
          if (data.res == "400") {
            $("#upload-result").text("上传成功");
            $("#imgdiv").html("<img src="upload/"+data.path+""/>");
          }else if (data.res == "403") {
            $("#upload-result").text("格式不对");
          }else if (data.res == "404") {
            $("#upload-result").text("上传错误");
          }
          
        },
        error:function(data){
          alert("上传失败")
        }
      })
    }
  </script>
</body>
</html>

upload.php

复制代码

<?php
header("Content-type:application/json");
 
//获取原始文件名
$filename = $_FILES["file"]["name"];
 
//获取文件后缀名
$hzm = substr($filename,strpos($filename,"."));
 
//设置新文件名
$newfilename = substr(str_shuffle("QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm"),26,10);
 
// 允许上传的图片后缀
$allowedExts = array("gif", "jpeg", "jpg", "png");
$temp = explode(".", $filename);
$extension = end($temp);
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/jpg")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "image/x-png")
|| ($_FILES["file"]["type"] == "image/png"))
&& ($_FILES["file"]["size"] < 2048000)  // 小于 2000 kb
&& in_array($extension, $allowedExts))
{
  if ($_FILES["file"]["error"] > 0)
  {
    echo "{"res":"404"}";
  }
  else
  {
  // 此处可以输出文件的详细信息
  if (file_exists("upload/" . $newfilename.$hzm))
    {
      //
    }
    else
    {
      move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $newfilename.$hzm);
      echo "{"path":"$newfilename$hzm","res":"400"}";
    }
  }
}
else
{
  echo "{"res":"403"}";
}
?>

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<?php
header("Content-type:application/json");
 
//获取原始文件名
$filename = $_FILES["file"]["name"];
 
//获取文件后缀名
$hzm = substr($filename,strpos($filename,"."));
 
//设置新文件名
$newfilename = substr(str_shuffle("QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm"),26,10);
 
// 允许上传的图片后缀
$allowedExts = array("gif", "jpeg", "jpg", "png");
$temp = explode(".", $filename);
$extension = end($temp);
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/jpg")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "image/x-png")
|| ($_FILES["file"]["type"] == "image/png"))
&& ($_FILES["file"]["size"] < 2048000)  // 小于 2000 kb
&& in_array($extension, $allowedExts))
{
  if ($_FILES["file"]["error"] > 0)
  {
    echo "{"res":"404"}";
  }
  else
  {
  // 此处可以输出文件的详细信息
  if (file_exists("upload/" . $newfilename.$hzm))
    {
      //
    }
    else
    {
      move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $newfilename.$hzm);
      echo "{"path":"$newfilename$hzm","res":"400"}";
    }
  }
}
else
{
  echo "{"res":"403"}";
}
?>