文件上传，java文件上传
文件上传分为两个步骤
1，客户端用户上传；
a)需要一个表单域，用来注入要上传的文件，
<span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="file"</span> <span>/></span>
b)用户选择所需要上传的文件
c)用户点击，将文件发送给服务器
2，服务器接收
form表单使用POST提交方式。
*注意：GET，POST不能提交二进制文件，但是POST提交增加一个属性便可以完成。
<span><</span><span>form </span><span>action</span><span>="file.php"</span><span> method</span><span>="POST"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span>
html部分：
html部分： DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>文件上传title> head> <body> <span><</span><span>form </span><span>action</span><span>="file.php"</span><span> method</span><span>="POST"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span> <span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="file"</span> <span>/></span> <input type="submit" value="提交"/> form> body>
php部分
var_dump($_FILES) 时发现得到的是一个数组
<span>array</span>
'file' =>
<span>array</span>
'name' => <span>string</span> '4.jpg' (length=5<span>)
</span>'type' => <span>string</span> 'image/jpeg' (length=10<span>)
</span>'tmp_name' => <span>string</span> 'F:\wamp\tmp\php904D.tmp' (length=23<span>)
</span>'error' => int 0
'size' => int 273665
此时要进行数据验证
a)根据二维数组找到error点；
<span>switch</span>(<span>$_FILES</span>['file']['error'<span>]){
</span><span>case</span> '0':
<span>echo</span> "上传成功"<span>;
</span><span>break</span><span>;
</span><span>case</span> '1':
<span>case</span> '2':
<span>header</span>('Refresh:3;url=file.html'<span>);
</span><span>echo</span> "文件大小超过服务器限制"<span>;
</span><span>break</span><span>;
</span><span>case</span> '3':
<span>header</span>('Refresh:3;url=file.html'<span>);
</span><span>echo</span> "文件只有部分上传成功"<span>;
</span><span>break</span><span>;
</span><span>case</span> '4':
<span>header</span>('Refresh:3;url=file.html'<span>);
</span><span>echo</span> "未选中文件，请重新选择文件并提交"<span>;
</span><span>break</span><span>;
</span><span>default</span>:
<span>echo</span> "文件上传失败"<span>;
}</span>
b)文件上传成功后，放到了指定的临时目录中，此时需要更改到期待的文件中，
php有一个函数可以完成，move_uploaded_file()
eg:
<span>move_uploaded_file</span>(<span>$_FILES</span>['file']['tmp_name'], './cy1/' . <span>$_FILES</span>['file']['name']);
注：tmp_name，文件上传到服务器的临时目录，
'name'，文件在客户端本地的文件名字。
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
SublimeText3 English version
Recommended: Win version, supports code prompts!
Atom editor mac version download
The most popular open source editor
