python -m http.server 8081
或者:
python -m SimpleHTTPServer 8081
接着介绍HTML文件,index.html是首页代码,主要实现文件上传功能,代码如下:
文件上传
文件上传
提交
页面如下(有点儿过于简单,还好本项目是注重文档预览功能):markdown.html主要用于展示Markdown文件中的内容,代码如下:
Markdown文件展示
function convert(){
var converter = new showdown.Converter();
var text = "{{ md_content }}";
var html = converter.makeHtml(text.replace(/newline/g, "\n"));
document.getElementById("result").innerHTML = html;
}
注意,我们在head部分引用了showdown.js的CDN地址,这样就不用下载该项目文件了。最后是后端部分,采用Python的Tornado模块实现。tornado_file_receiver.py主要用于文档的上传和保存,并展示文档内容,完整代码如下:
# -*- coding: utf-8 -*-
import os
import logging
import traceback
import tornado.ioloop
import tornado.web
from tornado import options
from parse_file import *
# 文档上传与解析
class UploadFileHandler(tornado.web.RequestHandler):
# get函数
def get(self):
self.render('upload.html')
def post(self):
# 文件的存放路径
upload_path = os.path.join(os.path.dirname(__file__), 'pdfjs/web/files')
# 提取表单中‘name’为‘file’的文件元数据
# 暂时只支持单文档的上传
file_meta = self.request.files['file'][0]
filename = file_meta['filename']
# 保存文件
with open(os.path.join(upload_path, filename), 'wb') as up:
up.write(file_meta['body'])
text = file_meta["body"]
# 解析文件的内容
mtype = file_meta["content_type"]
logging.info('POST "%s" "%s" %d bytes', filename, mtype, len(text))
if mtype in ["text/x-python", "text/x-python-script"]:
self.write(parse_python(str(text, encoding="utf-8")))
elif mtype in ["text/plain", "text/csv"]:
self.write(parse_text_plain(str(text, encoding="utf-8")))
elif mtype == "text/html":
self.write(str(text, encoding="utf-8"))
elif mtype.startswith("image"):
self.write(parse_image(mtype, text))
elif mtype == "application/json":
self.write(parse_application_json(str(text, encoding="utf-8")))
elif mtype == "application/pdf":
self.redirect("http://127.0.0.1:8081/web/viewer.html?file=files/%s" % filename)
elif mtype == "application/octet-stream" and filename.endswith(".md"):
self.render("markdown.html", md_content=r"%s" % str(text, encoding="utf-8").replace("\n", "newline"))
else: # 其余文件格式
try:
self.write(str(text, encoding="utf-8").replace("\n", "
")) except Exception:
logging.error(traceback.format_exc())
self.write('')
def make_app():
return tornado.web.Application([(r"/file", UploadFileHandler)],
template_path=os.path.join(os.path.dirname(__file__), "templates")) # 模板路径
if __name__ == "__main__":
# Tornado configures logging.
options.parse_command_line()
app = make_app()
app.listen(8888)
tornado.ioloop.IOLoop.current().start()
parse_file.py用于解析各种格式的文档,并返回HTML展示的格式,完整代码如下:
# -*- coding: utf-8 -*-
# author: Jclian91
# place: Pudong Shanghai
# time: 2020/6/5 1:05 下午
# filename: parse_file.py
# 用于解析各种文件类型的数据
import json
import base64
import logging
import traceback
from json import JSONDecodeError
# 解析text/plain或者text/csv文件格式
def parse_text_plain(text):
return "%s" % text.replace("\n", "
")# 解析application/json文件格式
def parse_application_json(text):
try:
data_dict = json.loads(text)
return json.dumps(data_dict, ensure_ascii=False, indent=2).replace("\n", "
").replace(" ", " ") except JSONDecodeError:
try:
data_list = [json.loads(_) for _ in text.split("\n") if _]
return json.dumps(data_list, ensure_ascii=False, indent=2).replace("\n", "
").replace(" ", " ") except JSONDecodeError:
logging.error(traceback.format_exc())
return "JSON文件格式解析错误"
except Exception as err:
logging.error(traceback.format_exc())
return "未知错误: %s" % err
# 解析image/*文件格式
def parse_image(mtype, text):
return '' % \
(mtype, str(base64.b64encode(text), "utf-8"))
# 解析Python文件
def parse_python(text):
# indent和换行
text = text.replace("\n", "
").replace(" ", " ").replace("\t", " " * 4) # 关键字配色
color_list = ["gray", "red", "green", "blue", "orange", "purple", "pink", "brown", "wheat", "seagreen", "orchid", "olive"]
key_words = ["self", "from", "import", "def", ":", "return", "open", "class", "try", "except", '"', "print"]
for word, color in zip(key_words, color_list):
text = text.replace(word, '' % (color, word))
colors = ["peru"] * 7
punctuations = list("[](){}#")
for punctuation, color in zip(punctuations, colors):
text = text.replace(punctuation, '' % (color, punctuation))
html = "%s" % text
return html
self.write(str(text, encoding="utf-8"))
其中,str(text, encoding="utf-8")是将bytes字符串转化为UTF-8编码的字符串。
# 解析text/plain或者text/csv文件格式
def parse_text_plain(text):
return "%s" % text.replace("\n","
")
# 解析application/json文件格式
def parse_application_json(text):
try:
data_dict = json.loads(text)
return json.dumps(data_dict, ensure_ascii=False, indent=2).replace("\n", "
").replace(" ", " ") except JSONDecodeError:
try:
data_list = [json.loads(_) for _ in text.split("\n") if _]
return json.dumps(data_list, ensure_ascii=False, indent=2).replace("\n", "
").replace(" ", " ") except JSONDecodeError:
logging.error(traceback.format_exc())
return "JSON文件格式解析错误"
except Exception as err:
logging.error(traceback.format_exc())
return "未知错误: %s" % err
笔者相信一定有json文件更好的前端展示方式,这里没有采用专门处理json的JS框架,这以后作为后续的改进措施。
elif mtype == "application/pdf":
self.redirect("http://127.0.0.1:8081/web/viewer.html?file=files/%s" % filename)
# 解析Python文件
def parse_python(text):
# indent和换行
text = text.replace("\n", "
").replace(" ", " ").replace("\t", " " * 4) # 关键字配色
color_list = ["gray", "red", "green", "blue", "orange", "purple", "pink", "brown", "wheat", "seagreen", "orchid", "olive"]
key_words = ["self", "from", "import", "def", ":", "return", "open", "class", "try", "except", '"', "print"]
for word, color in zip(key_words, color_list):
text = text.replace(word, '' % (color, word))
colors = ["peru"] * 7
punctuations = list("[](){}#")
for punctuation, color in zip(punctuations, colors):
text = text.replace(punctuation, '' % (color, punctuation))
html = "%s" % text
return html
根据笔者的了解,其实有更好的Python脚本内容的预览方式,可以借助handout模块实现,这点笔者将会在后续加上。
就是对图片读取后的字符串进行base64编码即可,因此实现代码如下(parse_file.py中的代码):
import base64
# 解析image/*文件格式
def parse_image(mtype, text):
return '' % \
(mtype, str(base64.b64encode(text), "utf-8"))
elif mtype == "application/octet-stream" and filename.endswith(".md"):
self.render("markdown.html", md_content=r"%s" % str(text, encoding="utf-8").replace("\n", "newline"))
接着在markdown.html中的JS部分把Python读取的markdown中的换行符\n转化为newline,代码如下:
function convert(){
var converter = new showdown.Converter();
var text = "{{ md_content }}";
var html = converter.makeHtml(text.replace(/newline/g, "\n"));
document.getElementById("result").innerHTML = html;
}
PDF.js官方网址:http://mozilla.github.io/pdf.js/
showdown.js官方网址:https://github.com/showdownjs/showdown
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