/// <summary>
/// 在百度知道查询答案。
/// </summary>
/// <param name="sentence">要查询的句子</param>
/// <param name="num">获取的答案数</param>
/// <returns></returns>
public static string[] getBaiduZhidaoAnswers(string sentence, int num = 10)
{
string url = string.Format("https://zhidao.baidu.com/search?word={0}", WebConnectHelper.UrlEncode(sentence));
List <string> res = new List <string>();
string html = WebConnectHelper.getData(url, Encoding.GetEncoding("gb2312"));
HtmlDocument hdoc = new HtmlDocument();
hdoc.LoadHtml(html);
try
{
var urls = hdoc.DocumentNode.SelectNodes("//a[@class=\"ti\"]");
foreach (var aurl in urls)
{
string dw = ItemParser.removeBlank(aurl.GetAttributeValue("href", ""), true);
var areslist = getBaiduZhidaoAnswersByUrl(dw);
if (areslist.Length > 0)
{
res.Add(areslist[0]);
}
// 暂时只查第一个
if (res.Count > 0)
{
break;
}
}
}
catch { }
return(res.ToArray());
}
/// <summary>
/// 从百度知识图谱中寻找答案
/// 基本就是把关键词放入百度搜索，然后看百度有没有智能返回的结果
/// </summary>
/// <param name="words"></param>
/// <returns></returns>
public static string[] getBaiduKGResult(string words)
{
List <string> reslist = new List <string>();
string askUrl = "http://www.baidu.com/s?wd=" + WebConnectHelper.UrlEncode(words);
string html = WebConnectHelper.getData(askUrl, Encoding.UTF8);
HtmlDocument hdoc = new HtmlDocument();
hdoc.LoadHtml(html);
//统计数值
try
{
string gdp = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_gdp_subtitle\"]").InnerText);
reslist.Add(gdp);
}
catch { }
//图谱常识
try
{
string common = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_exactqa_s_answer\"]").InnerText);
reslist.Add(common);
}
catch { }
//股票
try
{
string gp = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_stockweakdemand_cur_num c-gap - right - small\"]").InnerText);
reslist.Add(gp);
string gpzf = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_stockweakdemand_cur_info c-gap-icon-right-small\"]").InnerText);
reslist.Add(gpzf);
}
catch { }
//热线电话
try
{
string rx = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_kefupoly_td2\"]").InnerText);
reslist.Add(rx);
}
catch { }
//翻译
try
{
string trans = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_sp_fanyi_line_two\"]").InnerText);
reslist.Add(trans);
}
catch { }
//数学运算
try
{
string trans = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@style=\"font-size:1.4em;line-height:22px;padding-bottom:2px;width:474px;\"]").InnerText);
reslist.Add(trans);
}
catch { }
//汇率换算
try
{
string hl = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_exrate_result\"]").InnerText);
reslist.Add(hl);
}
catch { }
//单位换算
try
{
string dw = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op-unit-result-single c-gap-left c-gap-right\"]").InnerText);
reslist.Add(dw);
}
catch { }
//邮编
try
{
string dw = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_post_content \"]").InnerText);
reslist.Add(dw);
}
catch { }
// 百度知道最佳答案
// 去所跳转的页面上找答案
try
{
string dw = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_best_answer_question_link\"]").GetAttributeValue("href", ""));
var answers = getBaiduZhidaoAnswers(dw)[0];
reslist.Add(answers);
}
catch { }
// 百度知道的推荐答案的第一个
// 去所跳转的页面上找答案
try
{
string dw = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_generalqa_answer c-gap-bottom-small op_generalqa_answer_first\"]").ChildNodes[3].FirstChild.GetAttributeValue("href", ""));
var answers = getBaiduZhidaoAnswersByUrl(dw)[0];
reslist.Add(answers);
}
catch { }
// 百度日历上的日子
// 由于它是js生成的日历，所以需要从js里正则匹配一下
try
{
Regex reg = new Regex("\"selectday\":\"([^\"]*?)\"", RegexOptions.None);
string date = reg.Match(html).Groups[1].Value;
if (!string.IsNullOrWhiteSpace(date))
{
reslist.Add(date);
}
}
catch { }
return(reslist.ToArray());
}
//public static string[] getSearchResult(string words, int pagenum = 10)
//{
// List<string> reslist = new List<string>();
// for (int i = 0; i < pagenum; i++)
// {
// string askUrl = "http://www.baidu.com/s?wd=" + WebConnectHelper.UrlEncode(words) + "&pn=" + (i * 10);
// string res = WebConnectHelper.getData(askUrl, Encoding.UTF8);
// res = res.Replace("\n", "").Replace("\r", "");
// HtmlDocument hdoc = new HtmlDocument();
// hdoc.LoadHtml(res);
// HtmlNodeCollection collection = hdoc.DocumentNode.SelectNodes("//*[@class=\"c-abstract\"]");
// if (collection != null)
// {
// foreach (HtmlNode node in collection)
// {
// reslist.Add(node.InnerText);
// }
// collection = hdoc.DocumentNode.SelectNodes("//*[@class=\"t\"]");
// foreach (HtmlNode node in collection)
// {
// reslist.Add(node.InnerText);
// }
// }
// else
// {
// return null;
// }
// }
// return reslist.ToArray();
//}
public string[] getWebsiteAnswer(string question)
{
List <string> answer = new List <string>();
string askUrl = "http://www.baidu.com/s?wd=" + WebConnectHelper.UrlEncode(question);
string res = WebConnectHelper.getData(askUrl, Encoding.UTF8);
res = res.Replace("\n", "").Replace("\r", "").Replace(" ", "");
Regex reg = new Regex("class=\"op_exactqa_s_answer\">(.*?)</div>");
if (reg.IsMatch(res))
{
//说明百度首页给出了智能答案
res = reg.Match(res).Groups[1].ToString();
reg = new Regex("target=\"_blank\">(.*?)</a>");
if (reg.IsMatch(res))
{
res = reg.Match(res).Groups[1].ToString();
answer.Add(res);
}
}
else
{
//判断是否是百度统计相关答案
reg = new Regex("<p class='op_gdp_subtitle'>(.*?)</p>");
if (reg.IsMatch(res))
{
res = reg.Match(res).Groups[1].ToString();
answer.Add(res);
}
else
{
//判断是否是计算题答案
reg = new Regex("line-height:22px;padding-bottom:2px;width:474px;\">(.*?)</div>");
if (reg.IsMatch(res))
{
res = reg.Match(res).Groups[1].ToString().Replace(" ", " ");
answer.Add(res);
}
else
{
string tmpstr = "正在百度问题：" + question;
answer.Add(tmpstr);
//去百度知道查一波
askUrl = "http://zhidao.baidu.com/search?word=" + question;
res = WebConnectHelper.getData(askUrl);
res = res.Replace("\n", "").Replace("\r", "").Replace(" ", "");
//如果rank较低就舍弃
reg = new Regex("data-rank=\"(.*?)\"");
if (reg.IsMatch(res))
{
string rank = reg.Match(res).Groups[1].ToString().Split(':')[0];
int rankvalue = Int32.Parse(rank);
if (rankvalue <= 500)
{
//rank太低了，不再查询答案。
//return false;
}
}
reg = new Regex("data-log-area=\"list\">(.*?)</a>");
if (reg.IsMatch(res))
{
res = reg.Match(res).Groups[1].ToString();
reg = new Regex("href=\"(.*?)\"");
if (reg.IsMatch(res))
{
//从知道首页找到最接近的答案的url
askUrl = reg.Match(res).Groups[1].ToString();
res = WebConnectHelper.getData(askUrl).Replace("\n", "").Replace("\r", "").Replace(" ", "");
Regex[] regs = new Regex[] {
//被采纳答案
new Regex("wgt-best(.*?)i-quality-icon"),
new Regex("wgt-best(.*?)answer-share-widget"),
//尝试优质答案
new Regex("quality-content-detailcontent\">(.*?)</div>"),
//尝试网友推荐答案
new Regex("wgt-recommend(.*?)i-quality-icon")
};
bool ismatch = false;
foreach (var treg in regs)
{
if (treg.IsMatch(res))
{
//tmpOutputSentence.Add(res);
res = treg.Match(res).Groups[1].ToString();
ismatch = true;
break;
}
}
if (ismatch)
{
reg = new Regex("<pre(.*?)>(.*?)</pre>");
if (reg.IsMatch(res))
{
res = reg.Match(res).Groups[2].ToString();
res = res.Replace("<br>", "\r\n");
res = res.Replace("<br/>", "\r\n");
res = replaceImageWords(res);
answer.Add(res);
}
}
//{
// reg = ;
// if (reg.IsMatch(res))
// {
// res = reg.Match(res).Groups[1].ToString();
// res = res.Replace("<br>", "\r\n");
// res = res.Replace("<br/>", "\r\n");
// res = replaceImageWords(res);
// tmpOutputSentence.Add(res);
// isa = true;
// }
// else
// {
// ;
// if (reg.IsMatch(res))
// {
// res = reg.Match(res).Groups[1].ToString();
// reg = new Regex("<pre(.*?)>(.*?)</pre>");
// if (reg.IsMatch(res))
// {
// res = reg.Match(res).Groups[2].ToString();
// res = res.Replace("<br>", "\r\n");
// res = res.Replace("<br/>", "\r\n");
// res = replaceImageWords(res);
// tmpOutputSentence.Add(res);
// isa = true;
// }
// }
// }
//}
}
}
}
}
}
return(answer.ToArray());
}
