【源码分享】京东商品评价的爬虫

阳光穿透心脏的1/2处 2022-04-04 07:38 268阅读 0赞

/*使用javascript编写的爬虫源码，用于爬取京东商城上的商品信息和评论。
    代码粘贴到神箭手云爬虫平台（http://www.shenjianshou.cn/）上就可以直接跑了，不需要安装编译环境。要爬取其他网站，可以更改源码即可。
    代码执行具体步骤请参考：https://github.com/ShenJianShou/crawler_samples/blob/master/%E5%A6%82%E4%BD%95%E6%89%A7%E8%A1%8C%E6%A0%B7%E4%BE%8B%E4%BB%A3%E7%A0%81.txt
    */
     
    var keyword = "d3.js";//@input(keyword, 查询关键字, 爬取该关键字搜索出来的京东商品)
    var comment_count = 100;//@input(comment_count, 爬取的评论数, 最多爬取多少条评论)
     
    var page_count = comment_count / 10;
    keyword = keyword.trim();
    var scanUrls = [];
    scanUrls.push("http://search.jd.com/Search?keyword="+keyword.replace(/ /g, "+")+"&enc=utf-8&qrst=1&rt=1&stop=1&book=y&vt=2&page=1&s=1&click=0");
    var helperUrlRegexes = [];
    helperUrlRegexes.push("http://search\\.jd\\.com/Search\\?keyword="+keyword.replace(/ /g, "\\+").replace(/\./g, "\\.")+"&enc=utf-8&qrst=1&rt=1&stop=1&book=y&vt=2&page=\\d+&s=1&click=0");
     
    var configs = {
        domains: ["search.jd.com","item.jd.com","club.jd.com"],
        scanUrls: scanUrls,
        contentUrlRegexes: ["http://item\\.jd\\.com/\\d+.html"],
        helperUrlRegexes: helperUrlRegexes, 
        fields: [
            {
                // 第一个抽取项
                name: "title",
                selector: "//div[@id='name']/h1",
                required: true
            },
            {
                // 第一个抽取项
                name: "productid",
                selector: "//div[contains(@class,'fl')]/span[2]",
                required: true
            },
            {
                name: "comments",
                selector: "//div[@id='comment-pages']/span",
                repeated: true,
                children: [
                    {
                        name: "page",
                        selector: "//text()"
                    },
                    {
                        name: "comments",
                        sourceType: SourceType.AttachedUrl,
                        attachedUrl: "http://club.jd.com/productpage/p-{$.productid}-s-0-t-3-p-{page}.html",
                        selectorType: SelectorType.JsonPath,
                        selector: "$.comments",
                        repeated: true,
                        children:[
                            {
                                name: "com_content",
                                selectorType: SelectorType.JsonPath,
                                selector: "$.content"
                            },
                            {
                                name: "com_nickname",
                                selectorType: SelectorType.JsonPath,
                                selector: "$.nickname"
                            }
                        ]
                    }
                ]
            }
        ]
    };
    configs.afterDownloadPage = function(page, site) {
        var matches = /item\.jd\.com\/(\d+)\.html/.exec(page.url);
        if (!matches) return page;
        var commentUrl = "http://club.jd.com/productpage/p-"+matches[1]+"-s-0-t-3-p-0.html";
        var result = site.requestUrl(commentUrl);
        var data = JSON.parse(result);
        var commentCount = data.productCommentSummary.commentCount;
        var pages = commentCount / 10;
        if (pages > page_count) pages = page_count;
        var pageHtml = "<div id=\"comment-pages\">";
        for (var i = 0; i < pages; i++) {
            pageHtml += "<span>" + i + "</span>";
        }
        pageHtml += "</div>";
        var index = page.raw.indexOf("</body>");
        page.raw = page.raw.substring(0, index) + pageHtml + page.raw.substring(index);
        return page;
    };
    configs.onProcessHelperUrl = function(url, content, site){
        if(!content.indexOf("抱歉，没有找到")){
            var currentPage = parseInt(url.substring(url.indexOf("&page=") + 6));
            if(currentPage === 0){
                currentPage = 1;
            }
            var page = currentPage + 2;
            var nextUrl = url.replace("&page=" + currentPage, "&page=" + page);
            site.addUrl(nextUrl);
        }
        return true;
    };
    configs.afterExtractPage = function(page, data) {
        if (data.comments === null || data.comments === undefined) return data;
        var comments = [];
        for (var i = 0; i < data.comments.length; i++) {
            var p = data.comments[i];
            for (var j = 0; j < p.comments.length; j++) {
                comments.push(p.comments[j]);
            }
        }
        data.comments = comments;
        return data;
    };
    var crawler = new Crawler(configs);
    crawler.start();

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