es网站建设,泉州做 php 网站,优秀网页案例,品牌建设成功的案例紧跟着上一节说的文章#xff0c;虽然已经放出了所写的全代码#xff0c;但还是再解释一下另外一个页面的请求和分析过程吧。PS#xff1a;又可以愉快的水一章了#xff0c;咕嘿嘿。页面分析上回说到下载按钮的href属性是javascript:;伪协议#xff0c;导致了新打开的页面… 紧跟着上一节说的文章虽然已经放出了所写的全代码但还是再解释一下另外一个页面的请求和分析过程吧。PS又可以愉快的水一章了咕嘿嘿。页面分析上回说到下载按钮的href属性是javascript:;伪协议导致了新打开的页面链接携带#符号但是我们通过了phantomjs已经解决了第一次跳转的问题。下载页面事实证明这里更加狠连个伪协议都没有。不过没关系我们还是沿用上回的那个方法使用phantomjs来渲染页面并且将跳转的页面链接以响应返回给我们的客户端请求。实现采用上一节所说的让Phantomjs作为服务端然后去请求它让它把要爬取的结果反馈给.net。注意这里的返回给客户端的响应结果可以是网页页面也可以是Phantomjs进行HTML解析完的真实数据。.Net Core代码 public async Taskstring GetDownloadPageAsync(string url){string result string.Empty;//请求phantomjs 获取下载页面string dom Tappable-inactive animated fadeIn;KeyValuePairstring, string url2dom new KeyValuePairstring, string(url, dom);var postData JsonConvert.SerializeObject(url2dom);CookieContainer cc new CookieContainer(); HttpHelpers helper new HttpHelpers(); HttpItems items new HttpItems();HttpResults hr new HttpResults();items.Url this.PostUrl1;items.Method POST;items.Container cc;items.Postdata postData;items.Timeout 100000;hr await helper.GetHtmlAsync(items);var downloadPageUrl hr.Html;Console.WriteLine($first { downloadPageUrl });if(downloadPageUrl.Contains(http)){//获取百度云下载地址和分享密码//string code1 1;dom Tappable-inactive btn btn-success btn-block; // 下载链接url2dom new KeyValuePairstring, string(downloadPageUrl, dom);postData JsonConvert.SerializeObject(url2dom);items new HttpItems{Url this.PostUrl2};items.Method POST;items.Container cc;items.Postdata postData;items.Timeout 1000000;hr await helper.GetHtmlAsync(items);result hr.Html; //返回json数据Console.WriteLine($second { result });}else{result downloadPageUrl; //输出错误信息}return result;}这里包含了第一次在详情页获取下载页的那个请求以及下载页面获取百度云链接和分享密码的请求。JavaScript代码use strict;
var port 8089;
var server require(webserver).create();server.listen(8089, function (request, response) {//传入的参数有待更改目前为//{Key:https://acg12.com/download/#60e21d8417ab60fbfJfcqnT1BC8Qd20PehAIKv3J4ZO%2FJCo0htE9hP5IFZU, //Value:Tappable-inactive btn btn-success btn-block}的json字符窜//第一个参数为经过第一次请求所返回的下载页面第二个为下载按钮的Domvar data JSON.parse(request.postRaw);var url data.Key.toString();console.log(url);var dom data.Value.toString();console.log(dom);var code 200;var pwdArray new Array();var result new Array();var page require(webpage).create();page.onInitialized function() {page.customHeaders {};};page.settings.loadImages false;page.customHeaders {User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36,Referer: url};response.headers {Cache: no-cache,Content-Type: text/plain,Connection: Keep-Alive,Keep-Alive: timeout40, max100};//根据Phantomjs的官网这个回调在打开新标签页会触发page.onPageCreated function(newPage) {//console.log(A new child page was created! Its requested URL is not yet available, though.);page.onInitialized function() {newPage.customHeaders {};};newPage.settings.loadImages false;newPage.customHeaders {User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36};//newPage.viewportSize { width: 1920, height: 1080 };//当百度云页面打开并渲染完成时触发newPage.onLoadFinished function(status) {//console.log(A child page is Loaded: newPage.url);//newPage.render(newPage.png, {format: png, quality: 100});//console.log(pwdArray.length);if(pwdArray.length 0){//console.log(enter);//从数组中pop出密码当无密码时pop的数据为null字符窜var temp {url: newPage.url.toString(), password: pwdArray.pop().toString()};console.log(JSON.stringify(temp));result.push(temp); // 将json数据push进返回结果}};};page.open(url, function (status) {console.log(---- status);if (status ! success) {code 400;response.write(4XX);response.statusCode code;response.close();} else {code 200;window.setTimeout(function (){//var dom dom;pwdArray page.evaluate(function(dom) {console.log(dom);var pwdArray new Array();var btnList document.getElementsByClassName(dom); // 百度云链接for(var i 0; i btnList.length;i ){//猜测所有下载节点都有密码var temp document.getElementById(downloadPwd- i);if(temp ! undefined){//console.log(**** temp.value);pwdArray.push(temp.value); // 有密码push进数组}else{//console.log(****null);pwdArray.push(null); // 无密码则push进null字符窜这样做到和url的一一对应}}for(var i 0; i btnList.length;i ){//console.log(click);btnList[i].click(); // 点击下载打开新标签页}return pwdArray;}, dom);}, 6000);}});//设置等待20秒后才发送客户端的响应结果这样保证上述方法都能成功运行结束window.setTimeout(function(){var rs JSON.stringify(result)console.log(rs);response.write(rs);response.statusCode code;response.close();}, 20000);page.onConsoleMessage function(msg, lineNum, sourceId) {console.log($$$$$ msg);};page.onError function(msg, trace) {var msgStack [PHANTOM ERROR: msg];if (trace trace.length) {msgStack.push(TRACE:);trace.forEach(function(t) {msgStack.push( - (t.file || t.sourceURL) : t.line (t.function ? (in function t.function ) : ));});}console.log(msgStack.join(\n));phantom.exit(1);};
});
phantom.onError function(msg, trace) {var msgStack [PHANTOM ERROR: msg];if (trace trace.length) {msgStack.push(TRACE:);trace.forEach(function(t) {msgStack.push( - (t.file || t.sourceURL) : t.line (t.function ? (in function t.function ) : ));});}console.log(msgStack.join(\n));phantom.exit(1);};完整的源代码已经放在Github上了里面有写好的bat文件直接运行run.bat就行。当然前提第一节的那些环境都配置完成了。大家下周见下周可能可以尝试用用DotnetSpider这是借鉴了WebMagic写的.net core地爬虫框架有兴趣的可以先去尝试一下玩玩。原文地址http://www.jianshu.com/p/27bf3bb9ca60.NET社区新闻深度好文微信中搜索dotNET跨平台或扫描二维码关注
