1.1.上传文件和访问上传的文件

upload_file_demo.py

from flask import Flask,request,render_templateimport osfrom werkzeug.utils import secure_filenamefrom flask import send_from_directoryapp = Flask(__name__)#新建images文件夹，UPLOAD_PATH就是images的路径UPLOAD_PATH = os.path.join(os.path.dirname(__file__),‘images‘)@app.route(‘/upload/‘,methods=[‘GET‘,‘POST‘])def settings(): if request.method == ‘GET‘: return render_template(‘upload.html‘) else: desc = request.form.get(‘desc‘) avatar = request.files.get(‘avatar‘) # 对文件名进行包装，为了安全,不过对中文的文件名显示有问题 filename = secure_filename(avatar.filename) avatar.save(os.path.join(UPLOAD_PATH,filename)) print(desc) return ‘文件上传成功‘#访问上传的文件#浏览器访问：http://127.0.0.1:5000/images/django.jpg/ 就可以查看文件了@app.route(‘/images/<filename>/‘,methods=[‘GET‘,‘POST‘])def get_image(filename): return send_from_directory(UPLOAD_PATH,filename)@app.route(‘/‘)def hello_world(): return ‘Hello World!‘if __name__ == ‘__main__‘: app.run(debug=True)

upload.html

<form action="" method="post" enctype="multipart/form-data"> <table> <tbody> <tr> <td>头像：</td> <td><input type="file" name="avatar"></td> </tr> <tr> <td>描述：</td> <td><input type="text" name="desc"></td> </tr> <tr> <td><input type="submit" value="提交"></td> </tr> </tbody> </table></form>

1.2.使用flask-wtf验证上传的文件

forms.py

from wtforms import Form,FileField,StringFieldfrom wtforms.validators import InputRequiredfrom flask_wtf.file import FileRequired,FileAllowedclass UploadForm(Form): avatar = FileField(validators=[FileRequired(), #FileRequired必须上传 FileAllowed([‘jpg‘,‘png‘,‘gif‘]) #FileAllowed:必须为指定的格式的文件 ]) desc = StringField(validators=[InputRequired()])

upload_file_demo.py

from flask import Flask, request, render_templateimport osfrom werkzeug.utils import secure_filenamefrom flask import send_from_directoryfrom forms import UploadFormfrom werkzeug.datastructures import CombinedMultiDictapp = Flask(__name__)# 新建images文件夹，UPLOAD_PATH就是images的路径UPLOAD_PATH = os.path.join(os.path.dirname(__file__), ‘images‘)@app.route(‘/upload/‘, methods=[‘GET‘, ‘POST‘])def settings(): if request.method == ‘GET‘: return render_template(‘upload.html‘) else: # 文件是从request,files里面获取，这里使用CombinedMultiDict把form和file的数据组合起来，一起验证 form = UploadForm(CombinedMultiDict([request.form, request.files])) if form.validate(): desc = request.form.get(‘desc‘) avatar = request.files.get(‘avatar‘) # 对文件名进行包装，为了安全,不过对中文的文件名显示有问题 filename = secure_filename(avatar.filename) avatar.save(os.path.join(UPLOAD_PATH, filename)) print(desc) return ‘文件上传成功‘ else: print(form.errors) return "fail"# 访问上传的文件# 浏览器访问：http://127.0.0.1:5000/images/django.jpg/ 就可以查看文件了@app.route(‘/images/<filename>/‘, methods=[‘GET‘, ‘POST‘])def get_image(filename): return send_from_directory(UPLOAD_PATH, filename)@app.route(‘/‘)def hello_world(): return ‘Hello World!‘if __name__ == ‘__main__‘: app.run(debug=True)