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es+flask搜索小项目实现分页+高亮的示例代码

Python 2022-01-10

环境

  • 前端:html,css,js,jQuery,bootstrap
  • 后端:flask
  • 搜索引擎:elasticsearch
  • 数据源:某某之家

项目展示

es+flask搜索小项目实现分页+高亮的示例代码

es+flask搜索小项目实现分页+高亮的示例代码

项目目录

es+flask搜索小项目实现分页+高亮的示例代码

主要源码

获取数据源并写入es

from lxml import etree
from concurrent.futures import ThreadPoolExecutor
from elasticsearch import Elasticsearch
from elasticsearch import helpers
import requests

headers = {
    'user-agent': 'ua'
}

es = Elasticsearch()
if not es.indices.exists(index='car'):
    es.indices.create(index='car', mappings={
        'properties': {
            'url': {
                'type': 'text'
            },
            'img': {
                'type': 'text'
            },
            'title': {
                'type': 'text'
            },
            'desc': {
                'type': 'text'
            }

        }
    })


def task(url,page):
    res = requests.get(url, headers)
    text = res.text
    tree = etree.HTML(text)
    ul_list = tree.xpath('//ul[@class="article"]')
    actions = []
    for ul in ul_list:
        li_list = ul.xpath('./li')
        for li in li_list:
            url = li.xpath('./a/@href'),
            img = li.xpath('./a/div/img/@src'),
            desc = li.xpath('./a/p/text()'),
            title = li.xpath('./a/h3/text()')
            if title:
                doc = {
                    '_index': 'car',
                    'url': f'https:{url[0][0]}',
                    'img': img[0][0],
                    'desc': desc[0][0],
                    'title': title[0],
                }
                actions.append(doc)
    helpers.bulk(es, actions=actions)
    print(f'第{page}页完成!')


def main():
    with ThreadPoolExecutor() as pool:
        for i in range(1, 11):
            url = f'https://www.autohome.com.cn/all/{i}/'
            pool.submit(task, url=url,page=i)


if __name__ == '__main__':
    main()

视图函数

from flask import Blueprint
from flask import request
from flask import render_template
from flask import jsonify
from web.ext import es
from pprint import pprint

search_bp = Blueprint('search', __name__, url_prefix='/search')


@search_bp.route('/', methods=['get', 'post'])
def search():
    if request.method == 'GET':
        return render_template('search.html')
    elif request.method == 'POST':
        content = request.values.get('content')
        size = 10
        current = int(request.values.get('current', '0'))
        if content:
            res = es.search(index='car', query={
                'match': {
                    "title": content
                }
            }, highlight={
                "pre_tags": "<span style='color: red'>"
                ,
                "post_tags": "</span>"
                ,
                "fields": {
                    "title": {}
                }
            }, size=1000)
        else:
            res = es.search(index='car', query={
                'match_all': {}
            }, size=1000)
        new_res = res['hits']['hits']
        total = int(res['hits']['total']['value'])
        need_page = (total // size) + 1
        data = {
            'res': new_res[current * size:current * size + size],
            'need_page': need_page,
            'total': total
        }
        return jsonify(data)

前端

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>General Search</title>
    <link rel="stylesheet" href="{{ url_for('static',filename='css/bootstrap.min.css') }}">
    <script src="{{ url_for('static',filename='js/jQuery.js') }}"></script>
    <script src="{{ url_for('static',filename='js/bootstrap.min.js') }}"></script>
    <style>
        .title{
            font-size: 25px;
            font-weight: 10;
        }
        .result{
            color: red;
        }
    </style>
</head>
<body>
<div>
    <nav class="navbar navbar-default">
      <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a class="navbar-brand" href="#" style="margin-left: 100px">General Search</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
          <ul class="nav navbar-nav">
          </ul>
          <div class="navbar-form navbar-left">
            <div class="form-group">
              <input type="text" class="form-control" placeholder="" id="content" style="width: 800px;margin-left: 200px">
            </div>
          </div>
            <button class="btn btn-primary pull-right" id="submit" style="margin-top: 8px;width: 100px;">搜&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;索</button>
        </div><!-- /.navbar-collapse -->
      </div><!-- /.container-fluid -->
</nav>
</div>
<div class="container">
    General为您找到相关结果约<span id='count' class="result">0</span>个
    <hr>
</div>
<div class="container" id="tags">
</div>
<div class="text-center">
    <nav aria-label="Page navigation">
      <ul class="pagination" id="page">
      </ul>
    </nav>
</div>
<script>


    function getData(current)
    {
        let content=$('#content').val()
        let tags=$('#tags')
        $('#count').text()
        tags.empty()
        $.ajax({
            url:"",
            type:'post',
            data:{
                'content':content,
                'current':current
            },
            dataType:'JSON',
            success:function (res){
                let length=res.total
                let need_page=res.need_page
                $('#count').text(length)
                $.each(res.res,function (index,value){
                    let source=value._source
                    let title=source.title
                    let highlight=value.highlight
                    if (highlight)
                    {
                        title=highlight.title
                    }
                    let div=`
                    <div>
                        <p><a href="${source.url}" target="_blank">
                        <span class="title">${title}</span>
                        <br>
                        <img src="${source.img}" alt="">
                        </a></p>
                        <p>${source.desc}</p>
                        <hr>
                    </div>
                    `
                    tags.append(div)
                })
                $('#page').empty()
                for(let i=0;i<need_page;i++)
                {
                    let tmp=i+1
                    if (current==i)
                    {
                        $('#page').append('<li class="active"><span class="changePage">'+tmp+'</span></li>')
                    }
                    else {
                        $('#page').append('<li><span class="changePage">'+tmp+'</span></li>')
                    }

                }
            }
        })
    }
    $('#submit').click(function (){
        getData(0)
    })

    $('#page').on('click','li',function (){
        getData($(this).text()-1)
    })

</script>
</body>
</html>

app配置

from flask import Flask
from flask_session import Session
from web.ext import db
from .search.search import search_bp
from flask_script import Manager
from flask_migrate import Migrate, MigrateCommand


def create_app():
    app = Flask(__name__)
    app.config.from_object('settings.DevelopmentConfig')
    app.register_blueprint(search_bp)
    Session(app)
    db.init_app(app)
    app = Manager(app)
    Migrate(app, db)
    app.add_command('db', MigrateCommand)

    return app

总结

对比django,flask最后选用自由度较大的flask。

集合flask-script,flask_sqlalchemy,flask-migrate加快开发。

写一个小demo深化了对es接口的理解。

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