Django+pdfkit+wkhtmltopdf生成PDF

需求:将txt文件中的数据转换成表格,并生成PDF文件,以供下载

依赖

  • 安装wkhtmltopdf, Mac安装方式如下:
brew install wkhtmltopdf

记录下wkhtmltopdf的安装路径,以供代码中使用,这里是:/usr/local/bin/wkhtmltopdf

  • Django项目中,需要安装pdfkit 依赖,直接使用pip安装
pip install pdfkit

代码编写

第一步:数据转换

txt文件中的数据如下,需要将其取出,处理成list

代码如下:

读取文件内容


def get_file_content(file_dir, file_name):
    """
    获取文件内容 
    file_dir: txt文件目录
    file_name:txt文件文件名称
    """
    file_path = file_dir + file_name
    if not os.path.exists(file_path):
        raise Exception('文件目录:%s不存在' % file_dir)
    with open(file_path, "r", encoding='gbk') as f:
        data = f.read()
        return data

数据处理

def handle_file_data(data):
      """
      对文件内容进行处理:str->list
      """
      content = data.strip('\n')
        if not content:
            raise Exception('当前文件数据为空')
        lines = content.split('\n')
        key_str = lines.pop(0)
        keys = key_str.split(',')
        items = []
        for line in lines:
            valus = line.split(',')
            # valus的长度不够,补齐
            if len(keys) > len(valus):
                n = len(keys) - len(valus)
                for i in range(n):
                    valus.append('')
            # 数据组装
            item = {}
            for index in range(len(keys)):
                item[keys[index]] = valus[index]
            items.append(item)
        return items, keys

返回数据如下:

[
  {
	"APP_NAME": "测试1",
	"TABLE_NAME": "hei",
	"DATE_NAME": "20220902",
	"COUNT_NUM_SC": "1799454",
	"COUNT_NUM_ZB": "1799454",
	"YES_FLAG": "YES"
  },
  {
	"APP_NAME": "测试1",
	"TABLE_NAME": "hhh",
	"DATE_NAME": "20220903",
	"COUNT_NUM_SC": "1598208",
	"COUNT_NUM_ZB": "1598208",
	"YES_FLAG": "YES"
  },
  {
	"APP_NAME": "测试2",
	"TABLE_NAME": "wewdf",
	"DATE_NAME": "20220904",
	"COUNT_NUM_SC": "1615662",
	"COUNT_NUM_ZB": "1615662",
	"YES_FLAG": "YES"
  }
]

第二步:模版生成

这里使用的是Mako模版, 在项目的/templates目录下创建pdf.html文件,在里面写前端代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>PDF</title>
    <style>
        th {
            padding: 5px 5px;
        }
        td {
            padding: 5px 5px;
            max-width: 200px;
            word-wrap: break-word;
            white-space: normal;
            word-break:break-all;
        }
    </style>
</head>
<body>
<div style="width: 900px;margin: 0 auto;">
    <table border="1" cellpadding="0" cellspacing="0" width="100%">
        <thead>
            <tr>
                % for name in tableHeaders:
                <th>${name}</th>
                % endfor
            </tr>
        </thead>
        <tbody>
            % for item in data:
            <tr style="page-break-inside: avoid!important;">
                %if mergeData["APP_NAME"][loop.index] > 0:
                  <td rowspan='${mergeData["APP_NAME"][loop.index]}'>${ item["APP_NAME"] }</td>
                %endif
                %if mergeData["TABLE_NAME"][loop.index] > 0:
                  <td rowspan='${mergeData["TABLE_NAME"][loop.index]}'>${ item["TABLE_NAME"] }</td>
                %endif
                <td>${ item["DATE_NAME"] }</td>
                <td>${ item["COUNT_NUM_SC"] }</td>
                <td>${ item["COUNT_NUM_ZB"] }</td>
                <td>${ item["YES_FLAG"] }</td>
            </tr>
            % endfor
        </tbody>
    </table>
</div>
</body>
</html>

使用方法:

t = render_mako_context(request, 'pdf.html', {'data': data, 'mergeData': merge_data,
                                                          'tableHeaders': ch_headers})

content = t.content.decode(encoding="utf-8")

content为生成PDF提供数据

第三步:生成PDF

def pdf_create(wk_path, pdf_name, content, pdf_path):
    """
    生成PDF文件
    wk_path: wkhtmltopdf安装路径:`/usr/local/bin/wkhtmltopdf`
    pdf_path: PDF存放路径
    pdf_name: 生成的PDF文件名称
    content:模版内容
    """
    file_path = pdf_path + pdf_name + '.pdf'
    try:
        config = pdfkit.configuration(wkhtmltopdf=wk_path)
        result = pdfkit.from_string(content, file_path, options={'encoding': "utf-8"},
                           configuration=config)
    except Exception as e:
        logger.error('生成PDF文件异常:%s' % e)
        result = False

扩展:将url转换成PDF

config = pdfkit.configuration(wkhtmltopdf=wk_path)

url = 'http://www.baidu.com/'

pdfkit.from_url(url, file_path, options={'encoding': "utf-8"},
                           configuration=config)

第四步:下载PDF

def export_pdf(self, request, *args, **kwargs):
      """
      file_path: 下载的PDf文件路径
      """
      file = open(file_path, 'rb')
      response = FileResponse(file)
      response['Content-Type'] = 'application/octet-stream'
      response['Content-Disposition'] = 'attachment;filename="{}.pdf"'.format(file_name)
      return response

结果如果:

posted @ 2022-09-23 15:08  yingzi__block  阅读(289)  评论(0编辑  收藏  举报