基于django micro搭建网站实现加水印功能

用django_micro搭建的，给图片加文字水印的前端+后端功能开发；

大体功能是：输入水印的文字，选择要加水印的图片，最后生成加好水印的图片。

可在一页中显示多个加好水印的图片，且可点击显示或隐藏图片的缩略图。实现效果如下：

代码如下

from django_micro import route, run, configurefrom django.http import HttpRequest, HttpResponsefrom dominate.document import documentimport dominate.tags as domfrom wand.drawing import Drawing # 加水印用from wand.image import Image # 加水印用import base64 # 图片转字符串用 configure({’DEBUG’:True}) # 一些元素的clsCENTERFRAME = 'flex flex-col items-center justify-center bg-teal-200 h-screen'UPLOAD_FORM_ATTRIS ={ 'class':'flex flex-col justify-center', 'ic-post-to': '/file', 'ic-target': '#result_item', 'ic-replace-target': 'true', 'enctype': 'multipart/form-data'}CARD1 = 'flex flex-col bg-green-400 shadow-xl p-1 rounded-lg w-80 h-auto'TEXT_INPUT = 'shadow border rounded m-1 p-1 text-base text-center font-thin'CARD2 = 'flex flex-col bg-white shadow-xl p-2 rounded-lg w-80 h-80'DASHED_BOX = 'flex flex-col items-center justify-center border-dashed border-2 border-gray-200 h-full'UPLOAD_ICON = 'fas fa-file-upload text-gray-300 font-medium text-6xl'UPLOAD_BUTTON = 'flex justify-center bg-green-400 px-3 py-2 mt-4 text-white rounded shadow'RESULT_CONTAINER = 'flex flex-col bg-white items-center'RESULT_ITEM = 'flex flex-col justify-center bg-white p-2 border-t border-gray-200 w-64'TOGGLE_TEXT_ATTRIS = { # 这个常量后来没用 'ic-action':'slideToggle', # 'ic-target':'#toggle_img', # 以ID定位，只能选择第一个元素 'ic-target':'figure' # 以元素类型定位，会对所有同类元素进行操作} # 为了写head部分的引入方便，写个link_函数；下面script_函数类似def link_(lk): return dom.link(rel='stylesheet',type='text/css',href=lk) def script_(s): return dom.script(src=s) def page(): doc = document() with doc.head: link_('https://unpkg.com/tailwindcss@^1.0/dist/tailwind.min.css') # tailwind link_('https://extra-uru1z3cxu.now.sh/css/extra.css') # 额外写的扩展库 link_('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.8.2/css/all.css') # 为了使用font-awesome的图标 script_('https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js') # jquery script_('http://intercoolerjs.org/release/intercooler-1.2.2.js') # intercooler with doc.body: with dom.div(cls=CENTERFRAME) as CenterFrame: with dom.form(UPLOAD_FORM_ATTRIS) as UploadForm:# 输入水印文字区with dom.div(cls=CARD1) as Card1: dom.p('Write down your mark here',cls='text-base font-thin text-white' ) dom.input(cls=TEXT_INPUT,id='wm_text',type='text',name='mark_text',placeholder='your watermark text')# 上传图片区with dom.div(cls=CARD2) as Card2: with dom.div(cls=DASHED_BOX): dom.i(cls=UPLOAD_ICON,onclick=’’’$(’#fileupload’).click()’’’) dom.p('Find File', id='show_info', cls='text-gray-500 mt-4') dom.button('Upload', cls=UPLOAD_BUTTON) dom.input(cls='hidden', type='file', id='fileupload',name='ori_img', onchange=’’’$(’#show_info’).text(this.value.split('').pop(-1))’’’) # 生成水印图片区 with dom.div(cls=RESULT_CONTAINER) as ResultContainer:dom.span(id='result_item') return doc.render() def item(result_file_path): filename = result_file_path.split(’/’,1)[-1].split(’.’)[0] print(’filename:’,filename) # 处理图片，转成字符串 with open(result_file_path, 'rb') as imageFile: img_str = base64.b64encode(imageFile.read()) with dom.div(cls=RESULT_ITEM) as ResultItem: with dom.a( { 'ic-action':'slideToggle', 'ic-target':f'#{filename}' }) as ToggleText: dom.p(filename, cls='text-sm font-thin text-center text-gray-800') with dom.figure(cls='hidden',id=filename): # id中不能带’.’(点) dom.img(title='data src',alt='', src = 'data:image/jpeg;base64,' + str(img_str,’utf-8’) ) # 转str时要加’utf-8’，否则不能去掉b’ return dom.span(id='result_item').render() + ResultItem.render() @route(’’)def index(request: HttpRequest): return HttpResponse(page()) @route(’file’)def filehandler(request:HttpRequest): ori_img = request.FILES.get(’ori_img’) mark_text = request.POST.get(’mark_text’) # 得用request.POST，因为form提交是用POST方式 print(’mark_text:’,mark_text) result_file_path = ’output/Toggle_’+ori_img.name # 打水印后的文件保存路径 with Image(file=ori_img) as img: # 先保存原始图片 img.save(filename=’userupload/’ + ori_img.name) # 画图，把字画在原图上 with Drawing() as ctx: ctx.font_family = ’Times New Roman, Nimbus Roman No9’ # ctx.font_size = 50 ctx.font_size = int(img.height) * 0.1 ctx.text_kerning = 20 # 字间距 ctx.fill_color = ’grey’ # ctx.opacity = 0.9 # 不透明性 img.annotate(mark_text, ctx, left=int(img.width) * 0.1, baseline=int(img.height) * 0.45) img.save(filename=result_file_path) return HttpResponse(item(result_file_path)) app = run()

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