File Upload, Java file upload _php tutorial

File Upload, Java file upload

File upload is divided into two steps

1 , the client user uploads;

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

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

b) The user chooses the file to be uploaded

c) Click on the user to send the file to the server

2 , the server receives

The form form uses the Post submission method.

* Note: Get,post cannot submit binary files, but post submission adds a property to complete.

<action= "file.php"  method= "POST"   Enctype= "Multipart/form-data">

HTML section:

HTML section:
  DOCTYPE HTML><HTMLLang= "en"><Head>    <MetaCharSet= "UTF-8">    <title>File Upload 
     title> 
      head><body>  <form  action= "file.php"  method= "POST" enctype = "Multipart/form-data" > < input type = "File" name = "File" /> < input type = "Submit" value = "Submit" />  
       form> body>  
    
                           
 

PHP section

Var_dump ($_files) was found to be an array

array  ' File ' = =     array      string ' 4.jpg ' (length=5      )string ' Image/jpeg ' ( length=10)      string ' F:\wamp\tmp\php904D.tmp ' (length=23)      ' ERROR ' = int 0      ' size ' = = int 273665

Data validation is performed at this time

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

Switch ($_files[' file '] [' ERROR '])    {case ' 0 ':        echo "upload succeeded";          Break ;      Case ' 1 ': Case     ' 2 ':        header(' refresh:3;url=file.html ');         Echo "File size exceeds server limit";          Break ;      Case ' 3 ':        header(' refresh:3;url=file.html ');         Echo "The file only partially uploaded successfully"        ;  Break ;      Case ' 4 ':        header(' refresh:3;url=file.html ');         Echo "No files selected, please re-select the file and submit";          Break ;     default:        echo "File upload Failed";}

b) After the file upload is successful, it is placed in the specified temp directory, which needs to be changed to the desired file.

PHP has a function to complete,move_uploaded_file ()

eg

Move_uploaded_file ($_files$_files[' file '] [' name ']);

Note: tmp_name, files are uploaded to the server's temp directory,

' Name ', the file name of the file locally on the client.

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