用户图片上传和保存功能的完整实现（十六）
2020-04-15 本文已影响0人
梦捷者
一、功能实现步骤如下所示：
1、编写相关出处理get/post方法的图片上传类（在main.py模块中进行）
class UploadHandler(BaseHandler):
"""
用户上传图片信息
"""
@tornado.web.authenticated
def get(self):
self.render('user/upload.html', username=self.current_user)
@tornado.web.authenticated
def post(self):
try:
files = self.request.files['picture']#list类型中包含一个字典
if files[0]:
dict_img = files[0]
filename = dict_img['filename']
print(filename)
print(dict_img['content_type'])
save_path = 'static/upload/{}'.format(filename)
with open(save_path, 'wb') as f:
f.write(dict_img['body'])
im = Image.open(save_path)
im.thumbnail((200, 200))
im.save('static/thumbs/thumb_{}'.format(filename), 'JPEG')
post_id = add_post(self.current_user, 'upload/{}'.format(filename), 'thumbs/thumb_{}'.format(filename))
print(post_id)
if post_id:
self.redirect('/post/{}'.format(str(post_id)))
else:
self.write("上传失败，系统不听话")
except Exception as e:
print(e)
self.redirect('/upload')
2、增加add_post方法来进行图片信息的添加操作
def add_post(username, image_url, thumb_url):
session = Session()
user = session.query(User).filter_by(username=username).first()
post = Post(user_id=user.id, image_url=image_url, thumb_url=thumb_url)
session.add(post)
session.commit()
post_id = post.user_id
session.close()
return post_id
3、再进行添加路由
handlers=[(r'/upload',main.UploadHandler)]
4、编写前端代码
<!DOCTYPE html>
<html lang="zh-CN" >
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">
<link rel="icon" href="../../static/upload/hu.ico">
<title>上传图片界面</title>
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<link href="../../static/css/signin.css" rel="stylesheet">
</head>
<body background="../../static/upload/2.jpg">
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
{% if username!= None %}
<a class="navbar-brand" href="#">当前在线用户：<font style="color: yellow;font-size:20px">{{ username }}</font></a>
{% end %}
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-right">
<li style="margin-right:40px "><a href="/logout"><font style="color: yellow;font-size:20px">退出</font></a></li>
</ul>
</div>
</div>
</nav>
<div class="container" style="margin-top: 80px">
<form class="form-signin" action="/upload" enctype="multipart/form-data" method="post">
<h2 class="form-signin-heading" style="margin-left: 37px;color: yellow">请上传相应的文件</h2>
<label for="inputfile" class="sr-only">用户名</label>
<input type="file" id="inputfile" class="form-control" required autofocus name="picture">
<button class="btn btn-lg btn-primary btn-block" type="submit">上传</button>
</form>
<div style="margin-left: 547px">
<font size="3"> <b>查看上传图片，<a href="/check">直接点我</a></b></font>
</div>
</div>
</body>
</html>
