flask 实现上传图片并缩放作为头像的例子

{% extends "base.html" %}
{% import "bootstrap/wtf.html" as wtf %}

{% block title %}SYSUfm - 更换头像{% endblock %}

{% block page_content %}
<div class="page-header">
  <h1>更换你的头像</h1>
</div>
<div class="col-md-4">
  <form action="" method=post enctype=multipart/form-data>
    <input type=file name=file><br/>
    <input type=submit value=Upload>
  </form>
</div>

{% endblock %}

@main.route('/edit-avatar', methods=['GET', 'POST'])
@login_required
def change_avatar():
  if request.method == 'POST':
    file = request.files['file']
    size = (40, 40)
    im = Image.open(file)
    im.thumbnail(size)
    if file and allowed_file(file.filename):
      filename = secure_filename(file.filename)
      im.save(os.path.join(main.static_folder, 'avatar', filename))
      current_user.new_avatar_file = url_for('main.static', filename='%s/%s' % ('avatar', filename))
      current_user.is_avatar_default = False
      flash(u'头像修改成功')
      return redirect(url_for('.user', username=current_user.username))
  return render_template('change_avatar.html')