修改静态文件地址版本号的python脚本，给HTML里的css、js、图片等加上版本，使得静态资源既能缓存也能实时更新

change_version.py

# -*- coding: utf-8 -*-
import sys
from concurrent.futures import ThreadPoolExecutor
from datetime import datetime
import os
import re

def build_replace_func():
    version_string = "?ver=%s" % datetime.now().strftime("%Y%m%d%H")
  def func(match_obj):
		return match_obj.group('prefix') + version_string
	return func


SRC_PATTERN = re.compile(r'(?P<prefix><(script|link|img)[^@%>]*=["|\'][^"\']*\.(js|css|png|jpg))(\?ver=\d+)?')
REPLACE_FUNC = build_replace_func()


def scan_jsp_files(project_dir):
	jsp_files = []
	os.chdir(project_dir)
	for root, dirs, files in os.walk('./'):
		for file in files:
			if file.endswith('.jsp'):
				jsp_files.append(os.path.join(root, file))
	return jsp_files


def replace_js_css_png_jpg_version(content):
	return re.sub(SRC_PATTERN, REPLACE_FUNC, content)


def parse_and_replace_version(file):
	reader = open(file, 'r', encoding="utf-8")
	content = reader.read()
	content = replace_js_css_png_jpg_version(content)
	return content

def update_static_file_version(file):
	content = parse_and_replace_version(file)
	if content:
		writer = open(file, 'w', encoding="utf-8")
		writer.write(content)
		writer.close()
	#print("Updated " + file)


def update_project_static_file_version(project_dir):
	jsp_files = scan_jsp_files(project_dir)
	with ThreadPoolExecutor(max_workers=4) as executor:
		for file in jsp_files:
			executor.submit(update_static_file_version, file)
	

if __name__ == "__main__":
	if len(sys.argv) > 1:
		project_dir = sys.argv[1]
	else:
		project_dir = input("Project Dir?\n")
	begin_time = datetime.now()
	update_project_static_file_version(project_dir)
	print(datetime.now() - begin_time)