How to Successfully Upload Files to a PHP Server Using Jakarta HttpClient?

Uploading Files with Jakarta HttpClient and PHP

This article presents a solution for uploading files to an Apache server running PHP using Java's Jakarta HttpClient library version 4.0 beta2.

Initially, the provided Java code resulted in the PHP script failing to detect the uploaded file. The issue stemmed from an incorrect configuration in the Java class, which used a FileEntity object without explicitly specifying multipart parameters.

Correct Java Implementation:

The revised Java code incorporates the use of MultipartEntity to properly format the HTTP request:

MultipartEntity mpEntity = new MultipartEntity();
ContentBody cbFile = new FileBody(file, "image/jpeg");
mpEntity.addPart("userfile", cbFile);
httppost.setEntity(mpEntity);

This configuration effectively creates a multipart HTTP POST request with a binary attachment, conforming to the requirements of the PHP script.

PHP Script:

The PHP script remains simple:

if (is_uploaded_file($_FILES['userfile']['tmp_name'])) {
  echo "File ". $_FILES['userfile']['name'] ." uploaded successfully.\n";
  move_uploaded_file ($_FILES['userfile'] ['tmp_name'], $_FILES['userfile'] ['name']);
} else {
  echo "Possible file upload attack: ";
  echo "filename '". $_FILES['userfile']['tmp_name'] . "'.";
  print_r($_FILES);
}

With the correct Java implementation and PHP script, file uploads should now be processed successfully.

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