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Python从入门到精通day48

  • 2026-03-19 17:53:20
Python从入门到精通day48

报表制作实战:Excel/PDF 导出与前端可视化图表

在 Web 项目中,报表是数据的可视化呈现形式(报表 = 多样的格式 + 动态的数据)。本节课将基于 Django 实现三类核心报表功能:Excel 文件导出、PDF 文件导出、前端 ECharts 统计图表,满足不同场景下的数据展示需求。

一、导出 Excel 报表

报表就是用表格、图表等格式来动态显示数据,所以有人用这样的公式来描述报表:

报表 = 多样的格式 + 动态的数据

Excel 报表适合数据批量下载、离线分析,我们选用xlwt库(轻量、性能优,仅支持 xls 格式)实现教师信息 Excel 导出。

  1. 1. 安装依赖
pip install xlwt
  1. 2. 编写 Excel 导出视图函数
defexport_teachers_excel(request):# 创建工作簿    wb = xlwt.Workbook()# 添加工作表    sheet = wb.add_sheet('老师信息表')# 查询所有老师的信息    queryset = Teacher.objects.all()# 向Excel表单中写入表头    colnames = ('姓名''介绍''好评数''差评数''学科')for index, name inenumerate(colnames):        sheet.write(0, index, name)# 向单元格中写入老师的数据    props = ('name''detail''good_count''bad_count''subject')for row, teacher inenumerate(queryset):for col, prop inenumerate(props):            value = getattr(teacher, prop, '')ifisinstance(value, Subject):                value = value.name            sheet.write(row + 1, col, value)# 保存Excel    buffer = BytesIO()    wb.save(buffer)# 将二进制数据写入响应的消息体中并设置MIME类型    resp = HttpResponse(buffer.getvalue(), content_type='application/vnd.ms-excel')# 中文文件名需要处理成百分号编码    filename = quote('老师.xls')# 通过响应头告知浏览器下载该文件以及对应的文件名    resp['content-disposition'] = f'attachment; filename*=utf-8\'\'{filename}'return resp
  1. 3. 配置 URL 路由
urlpatterns = [    path('excel/', views.export_teachers_excel),]

核心优化说明

  • • select_related('subject'):关联查询学科,避免循环中多次查询数据库(N+1 问题);
  • • BytesIO:内存中操作文件,无需生成临时文件,提升性能;
  • • quote():处理中文文件名,避免浏览器解析乱码;
  • • 表头样式:可选配置,提升 Excel 可读性。

二、导出 PDF 报表

  1. 1. 安装依赖
# 安装reportlab库(PDF生成核心库)pip install reportlab
  1. 2. 编写 PDF 导出视图函数
defexport_pdf(request: HttpRequest) -> HttpResponse:    buffer = io.BytesIO()    pdf = canvas.Canvas(buffer)    pdf.setFont("Helvetica"80)    pdf.setFillColorRGB(0.20.50.3)    pdf.drawString(100550'hello, world!')    pdf.showPage()    pdf.save()    resp = HttpResponse(buffer.getvalue(), content_type='application/pdf')    resp['content-disposition'] = 'inline; filename="demo.pdf"'return resp
  1. 3. 配置 URL 路由
urlpatterns = [# 其他路由...    path('export/pdf/', views.export_teachers_pdf, name='export_pdf'),  # PDF导出]

关键说明

  • • 字体问题reportlab默认无中文字体,需指定系统存在的中文字体(如SimSun宋体、Microsoft YaHei微软雅黑);
  • • 页面布局canvas:适合自定义位置绘制(如报表、证件),灵活度高;SimpleDocTemplate:适合流式文档(如长文本、列表),自动分页;
  • • 响应头配置inline:浏览器在线预览 PDF;attachment:强制下载 PDF 文件。

三、生成前端统计图表

前端图表适合数据可视化展示(柱状图、折线图、饼图等),我们使用百度 ECharts(开源、易用)实现教师好评 / 差评统计。

  1. 1. 编写数据接口视图
defget_teachers_data(request):    queryset = Teacher.objects.all()    names = [teacher.name for teacher in queryset]    good_counts = [teacher.good_count for teacher in queryset]    bad_counts = [teacher.bad_count for teacher in queryset]return JsonResponse({'names': names, 'good': good_counts, 'bad': bad_counts})
  1. 2. 配置 URL 路由
urlpatterns = [    path('teachers_data/', views.get_teachers_data),]
  1. 3. 编写前端图表页面(ECharts)
<!DOCTYPE html><htmllang="en"><head><metacharset="UTF-8"><title>老师评价统计</title></head><body><divid="main"style="width: 600px; height: 400px"></div><p><ahref="/">返回首页</a></p><scriptsrc="https://cdn.bootcss.com/echarts/4.2.1-rc1/echarts.min.js"></script><script>var myChart = echarts.init(document.querySelector('#main'))fetch('/teachers_data/')            .then(resp => resp.json())            .then(json => {var option = {color: ['#f00''#00f'],title: {text'老师评价统计图'                    },tooltip: {},legend: {data:['好评''差评']                    },xAxis: {data: json.names                    },yAxis: {},series: [                        {name'好评',type'bar',data: json.good                        },                        {name'差评',type'bar',data: json.bad                        }                    ]                }                myChart.setOption(option)            })</script></body></html>

运行效果如下图所示。

核心优化说明
  • • 数据请求:使用fetch异步获取数据,添加错误处理,提升用户体验;
  • • 图表适配resize事件:窗口大小变化时图表自适应;rotate:X 轴标签旋转,避免教师姓名重叠;min: 0:Y 轴最小值设为 0,数据展示更合理;
  • • 样式优化:自定义颜色(好评绿、差评红)、柱子宽度,提升可读性;
  • • 性能优化:后端仅返回所需字段(values查询),减少数据传输量。

四、扩展与最佳实践

  1. 1. Excel 格式扩展(xlsx)若需支持 xlsx 格式,可改用openpyxl库,核心代码调整:
from openpyxl import Workbookfrom openpyxl.styles import Fontdefexport_teachers_xlsx(request):    wb = Workbook()    sheet = wb.active    sheet.title = '老师信息表'# 写入表头(略)# 写入数据(略)    buffer = BytesIO()    wb.save(buffer)    resp = HttpResponse(buffer.getvalue(), content_type='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')    resp['Content-Disposition'] = f'attachment; filename*=utf-8\'\'{quote("老师信息表.xlsx")}'return resp
  1. 2. PDF 复杂报表优化
  • • 批量数据:使用SimpleDocTemplate+Table组件实现表格;
  • • 中文支持:若reportlab无中文字体,可手动加载字体文件:
from reportlab.pdfbase import pdfmetricsfrom reportlab.pdfbase.ttfonts import TTFont# 注册字体(需提前准备字体文件,如simsun.ttf)pdfmetrics.registerFont(TTFont('SimSun''static/fonts/simsun.ttf'))
  1. 3. 前端图表扩展
  • • 切换图表类型:将type: 'bar'改为'line'(折线图)、'pie'(饼图)即可;
  • • 数据筛选:前端添加时间 / 学科筛选条件,后端接收参数后过滤数据;
  • • 动态刷新:添加定时刷新(setInterval),实时更新数据。

五、小结

本次实战完成了三类报表的核心实现,覆盖数据下载、离线文档、在线可视化场景:关键点回顾1.Excel 导出xlwt(xls)/openpyxl(xlsx),内存缓冲区操作,中文文件名编码;2. PDF 导出reportlab库,canvas 自定义绘制,注意中文字体配置;3. 前端图表:ECharts 异步获取数据,适配性优化,样式自定义;4. 性能优化:关联查询、字段筛选、内存操作,减少数据库 / 网络开销。

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  1. CONNECT:[ UseTime:0.000543s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000834s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000478s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002684s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000672s ]
  6. SELECT * FROM `set` [ RunTime:0.000265s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000575s ]
  8. SELECT * FROM `article` WHERE `id` = 479774 LIMIT 1 [ RunTime:0.002506s ]
  9. UPDATE `article` SET `lasttime` = 1774614501 WHERE `id` = 479774 [ RunTime:0.011692s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000261s ]
  11. SELECT * FROM `article` WHERE `id` < 479774 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000438s ]
  12. SELECT * FROM `article` WHERE `id` > 479774 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000390s ]
  13. SELECT * FROM `article` WHERE `id` < 479774 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000843s ]
  14. SELECT * FROM `article` WHERE `id` < 479774 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002451s ]
  15. SELECT * FROM `article` WHERE `id` < 479774 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008120s ]
0.102075s