请求完成，让用户知道状态发生了变化，可以使用flash确认消息
示例：
xx.py
from flask import Flask,render_template,request,redirect,url_for,flash
from werkzeug.utils import secure_filename
import os
app = Flask(__name__)
app.config['SECRET_KEY'] = os.urandom(24)
ALLOWED_EXTENSIONS = set(['txt', 'png', 'jpg', 'jpeg', 'gif'])
def allowed_file(filename):
return '.' in filename and filename.rsplit('.', 1)[1] in ALLOWED_EXTENSIONS
@app.route('/')
def hello_world():
return 'Hello World!'
@app.route('/upload/',methods=['GET','POST'])
def upload():
if request.method == 'POST':
f = request.files['file']
print (f)
if f and allowed_file(f.filename):
app.config['UPLOAD_FOLDER'] = os.path.join(os.path.dirname(__file__),'static/uploads')
print(app.config['UPLOAD_FOLDER'])
if not os.path.exists(app.config['UPLOAD_FOLDER']):
os.makedirs(app.config['UPLOAD_FOLDER'])
upload_file_name = os.path.join(app.config['UPLOAD_FOLDER'],f.filename)
print(secure_filename(f.filename))
f.save(upload_file_name)
flash("文件上传成功", 'ok')
return redirect(url_for('upload'))
flash("文件上传失败，无效的格式 %s" % f.filename.rsplit('.', 1)[1],'err')
return redirect(url_for('upload'))
return render_template('upload.html')
if __name__ == '__main__':
app.run(debug=True)
前端展示
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> </head> <body> <h2>文件上传示例</h2> <form action="" enctype='multipart/form-data' method='POST'> <input type="file" name="file"> <input type="submit" value="上传"> </form> {% for v in get_flashed_messages(category_filter=['err']) %} <p style="color:red;">{{ v }}</p> {% endfor %} {% for v in get_flashed_messages(category_filter=['ok']) %} <p style="color:green;">{{ v }}</p> {% endfor %} </body> </html>