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File upload, java file upload_PHP tutorial

WBOYOriginal: 2016-07-12 08:51:43992browse

File upload, java file upload

File upload is divided into two steps

1, Uploaded by client users;

a) A form field is required to inject the file to be uploaded,

<span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="file"</span> <span>/></span>

b) The user selects the file to be uploaded

c) The user clicks to send the file to the server

2, server receives

Form forms use POST submission method.

*Note: GET and POST cannot submit binary files, but POST submission can be completed by adding an attribute.

<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 part:

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 part

When var_dump($_FILES) was used, it was found that what was obtained was an array

<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

Data verification is required at this time

a) Find the error point based on the two-dimensional array;

<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) After the file is successfully uploaded, it is placed in the designated temporary directory. At this time, it needs to be changed to the expected file,

php has a function that can be done,

move_uploaded_file()

eg:

<span>move_uploaded_file</span>(<span>$_FILES</span>['file']['tmp_name'], './cy1/' . <span>$_FILES</span>['file']['name']);

Note: tmp_name, the temporary directory where files are uploaded to the server,

'name', the local file name of the file on the client.

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