/// <summary>
/// 保存评论到Excel
/// </summary>
/// <returns></returns>
public void SaveComments()
{
int count = 0;
while (true)
{
if (comments.Count > 0)
{
var list = comments.Select(x => x).ToList();
//保存到excel中
try
{
comments.RemoveAll(x => { return(list.Any(i => i.Equals(x))); });
Log4Net.LogInfo($"本次保存{list.Count}条评论");
excel.Insert(list);
count++;
}
catch (Exception e)
{
Log4Net.ErrorInfo($"本次保存到Excel失败，行数：{list.Count}，值：{JsonConvert.SerializeObject(list)}。异常信息：", e);
}
}
else
{
if (exit)
{
Log4Net.LogInfo($"数据导出完成，保存Excel文件");
excel.Save();
Log4Net.LogInfo($"本次任务已完成，程序退出");
break;
}
}
if (count / 10 == 0 && count > 0)
{ //每插入10次数据，保存一次Excel
excel.Save();
}
System.Threading.Thread.Sleep(5000);
}
}
public Spider(string _url, string filename)
{
context = BrowsingContext.New(Configuration.Default);
comments = new List <Models.Comment>();
weibo_url = _url;
var uri = new Uri(weibo_url);
cookies = System.Configuration.ConfigurationManager.AppSettings["cookie"];
var httpClient = new HttpClient()
{
BaseAddress = new Uri($"{uri.Scheme}://{uri.Host}"),
Timeout = new TimeSpan(0, 0, 30),
};
string filedir = System.Configuration.ConfigurationManager.AppSettings["filedir"];
excel_path = $"{PlatformServices.Default.Application.ApplicationBasePath}{filedir}/out/{filename}";
excel = new Excel(excel_path);
Log4Net.LogInfo($"Excel文件保存在{excel_path}");
httpService = new HttpService(httpClient);
}
/// <summary>
/// 处理评论
/// </summary>
/// <param name="html"></param>
/// <returns></returns>
private async Task CommentHandle(Uri uri, string weibo_link)
{
Log4Net.LogInfo($"正在抓取评论链接[{uri}]");
var res_str = await httpService.GetAsync(uri.PathAndQuery, cookies);
if (!string.IsNullOrEmpty(res_str))
{
try
{
Log4Net.LogInfo($"评论链接[{uri}]内容获取成功，开始处理数据");
var response = JsonConvert.DeserializeObject <Models.Response>(res_str);
var document = await context.OpenAsync(req => req.Content(response.data.html));
var document_comment_list = document.QuerySelectorAll("*").Where(x => "comment_list".Equals(x.GetAttribute("node-type"))).FirstOrDefault(); //获取评论列表的dom
Log4Net.LogInfo($"取得评论区");
//这里有：主评论、子评论列表的链接、主评论下一页的链接
//1.取主评论列表
document_comment_list
.QuerySelectorAll("div")
.Where(x => "list_li S_line1 clearfix".Equals(x.ClassName))
.ToList() //遍历主评论
.ForEach(x =>
{
var commentId = x.GetAttribute("comment_id"); //主评论Id
var comment_body_dom = x.GetElementsByClassName("WB_text").FirstOrDefault(); //评论主体DOM
//从这里取用户Id、昵称和评论内容，图片和下级子评论在别的节点中取
//1.取用户Id，第1个A标签中有用户Id和昵称
var a_dom = comment_body_dom.QuerySelectorAll("a");
var first_a_dom = a_dom.FirstOrDefault();
var user_id = first_a_dom.GetAttribute("usercard").Replace("id=", ""); //用户Id
var nick = first_a_dom.TextContent; //直接取文字部分为昵称
var datetime = x.GetElementsByClassName("WB_from S_txt2").FirstOrDefault().TextContent;
foreach (var a in a_dom)
{ //删除所有的A标签
a.Remove();
}
//2.评论的内容，处理表情，先取表情的图片
comment_body_dom.QuerySelectorAll("img").Where(m => "face".Equals(m.GetAttribute("type"))).ToList().ForEach(face =>
{
comment_body_dom.InnerHtml = comment_body_dom.InnerHtml.Replace(face.OuterHtml, face.GetAttribute("title")); //把表情图片替换成文字
});
var body = comment_body_dom.TextContent.Trim().TrimStart('：'); //评论内容
var comment = new Models.Comment
{
CommentId = commentId,
UserId = user_id,
Nick = nick,
DateAndTime = datetime,
Body = body,
CommentUrl = $"{uri}"
};
//3.处理评论图片，单图
var image_dom = x.QuerySelectorAll("div").Where(m => "comment_media_prev".Equals(m.GetAttribute("node-type")));
if (image_dom.Any())
{
comment.ImageUrl = CommentImageHandle(image_dom.FirstOrDefault());
}
comments.Add(comment);
});
string link = "";
var page = response.data.page;
if (page != null)
{
Log4Net.LogInfo($"处理完第[{page.pagenum}]页评论数据");
if (page.pagenum < page.totalpage)
{
link = $"{Link(weibo_link)}&page={(page.pagenum + 1)}";
}
}
else
{
link = await NextLinkHandle(document_comment_list);
link = $"{Link(link)}";
}
if (!string.IsNullOrEmpty(link))
{
Log4Net.LogInfo($"5秒后处理URL[{link}]的评论");
uri = new Uri(link);
System.Threading.Thread.Sleep(5000);
await CommentHandle(uri, weibo_link);
}
else
{
exit = true; //退出
Log4Net.LogInfo($"评论数据处理完成");
Log4Net.LogInfo($"最后一页内容：{res_str}");
}
}
catch (Exception e)
{
Log4Net.ErrorInfo($"处理评论数据异常，URL：[{uri}]，网页返回：{res_str}", e);
Log4Net.LogInfo($"5秒后异常重试URL[{uri}]");
System.Threading.Thread.Sleep(5000);
await CommentHandle(uri, weibo_link);
}
}
}
