问题：在开发odoo14的打印单过程中：Wkhtmltopdf打印插件已安装的情况下，发现样式丢失了，如下图
问题的原因：
1、可能是外网与内网服务转换时候造成的样式丢失，有时候是端口不一致导致的某些服务不能正常使用；
2、wkhtmltopdf 中文显示空白或者乱码方框,缺少中文字体；
原因1解决办法：
1、方法一：如果分内外网的话，在系统参数里面的web.base.url 改成内网的ip+端口；
2、方法二：或者新增一个report.url的系统参数：参数设置同上内网的ip+端口；
原因2解决办法：
网络上下载宋体（simsun.ttc）文件 上传到服务器的 /usr/share/fonts/文件夹下
解决方法二： # sudo apt-get install fonts-wqy-zenhei # sudo apt-get install fonts-wqy-microhei
最后测试打印：
注意【小提示】：系统原生的打印逻辑代码，在ir_actions_report.py文件中
def _prepare_html(self, html):
'''Divide and recreate the header/footer html by merging all found in html.
The bodies are extracted and added to a list. Then, extract the specific_paperformat_args.
The idea is to put all headers/footers together. Then, we will use a javascript trick
(see minimal_layout template) to set the right header/footer during the processing of wkhtmltopdf.
This allows the computation of multiple reports in a single call to wkhtmltopdf.
:param html: The html rendered by render_qweb_html.
:type: bodies: list of string representing each one a html body.
:type header: string representing the html header.
:type footer: string representing the html footer.
:type specific_paperformat_args: dictionary of prioritized paperformat values.
:return: bodies, header, footer, specific_paperformat_args
'''
IrConfig = self.env['ir.config_parameter'].sudo()
base_url = IrConfig.get_param('report.url') or IrConfig.get_param('web.base.url')
# Return empty dictionary if 'web.minimal_layout' not found.
layout = self.env.ref('web.minimal_layout', False)
if not layout:
return {}
layout = self.env['ir.ui.view'].browse(self.env['ir.ui.view'].get_view_id('web.minimal_layout'))
root = lxml.html.fromstring(html)
match_klass = "//div[contains(concat(' ', normalize-space(@class), ' '), ' {} ')]"
header_node = etree.Element('div', id='minimal_layout_report_headers')
footer_node = etree.Element('div', id='minimal_layout_report_footers')
bodies = []
res_ids = []
body_parent = root.xpath('//main')[0]
# Retrieve headers
for node in root.xpath(match_klass.format('header')):
body_parent = node.getparent()
node.getparent().remove(node)
header_node.append(node)
# Retrieve footers
for node in root.xpath(match_klass.format('footer')):
body_parent = node.getparent()
node.getparent().remove(node)
footer_node.append(node)
# Retrieve bodies
for node in root.xpath(match_klass.format('article')):
layout_with_lang = layout
# set context language to body language
if node.get('data-oe-lang'):
layout_with_lang = layout_with_lang.with_context(lang=node.get('data-oe-lang'))
body = layout_with_lang._render(dict(subst=False, body=lxml.html.tostring(node), base_url=base_url))
bodies.append(body)
if node.get('data-oe-model') == self.model:
res_ids.append(int(node.get('data-oe-id', 0)))
else:
res_ids.append(None)
if not bodies:
body = bytearray().join([lxml.html.tostring(c) for c in body_parent.getchildren()])
bodies.append(body)
# Get paperformat arguments set in the root html tag. They are prioritized over
# paperformat-record arguments.
specific_paperformat_args = {}
for attribute in root.items():
if attribute[0].startswith('data-report-'):
specific_paperformat_args[attribute[0]] = attribute[1]
header = layout._render(dict(subst=True, body=lxml.html.tostring(header_node), base_url=base_url))
footer = layout._render(dict(subst=True, body=lxml.html.tostring(footer_node), base_url=base_url))
return bodies, res_ids, header, footer, specific_paperformat_args
1、在base_url = IrConfig.get_param('report.url') or IrConfig.get_param('web.base.url')中取了系统参数中的report.url或web.base.url中的地址。
2、在body = layout_with_lang._render(dict(subst=False, body=lxml.html.tostring(node), base_url=base_url))中渲染了我们必要的样式，若这里的url出错，那么这里我们将缺少样式内容。当然，若是全部都通过html原生去实现样式，那么也是可以避免如上的问题。