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抢先式多线程网络蜘蛛

框架 // Copyright(C) 2017 铭飞科技 // #region 版权信息 /* * 此文件自 Copyright(C) 2008 - 2017 铭飞科技 Classification:无 开源网站:http://www.http://www. coding */ #endregion using System; using System.Data; using System.Web.UI; using System.Web.UI.WebControls; using System.Collections; using System.Collections.Generic; using System.Collections.Specialized; namespace Web.Templates.UI { ///

/// 标签树控件 /// public class Tree : System.Web.UI.WebControls.TreeView { private string _styleName = ""; /// /// 样式 /// /// The name of the style. public string StyleName { get { return _styleName; } set { _styleName = value; } } private string _checkedValue = ""; /// /// 默认选中当前值 /// /// The checked value. public string CheckedValue { get { return _checkedValue; } set { _checkedValue = value; } } private string _checkBoxName = ""; /// /// 复选框名称 /// /// The check box name. public string CheckBoxName { get { return _checkBoxName; } set { _checkBoxName = value; } } private int _checkParentType = -1; /// /// /// /// The type of the check parent. public int CheckParentType { get { return _checkParentType; } set { _checkParentType = value; } } private int _checkChildType = -1; /// /// /// /// The type of the check child. public int CheckChildType { get { return _checkChildType; } set { _checkChildType = value; } } private string _showLevel = "999"; /// /// 显示层级 /// /// The show level. public string ShowLevel { get { return _showLevel; } set { _showLevel = value; } } private string _valueField = "id"; /// /// 编号字段名 /// /// The value field. public string ValueField { get { return _valueField; } set { _valueField = value; } } private string _textField = "title"; /// /// 显示字段名 /// /// The text field. public string TextField { get { return _textField; } set { _textField = value; } } private string _fatherField = "parentid"; /// /// 父编号字段名 /// /// The father field. public string FatherField { get { return _fatherField; } set { _fatherField = value; } } private TreeNodeBindEventHandler _onBind; /// /// 构建事件 /// /// The on bind event. public event TreeNodeBindEventHandler OnBind { add { _onBind += value; } remove { _onBind -= value; } } private DataTable _dataSource; /// /// 数据源 /// /// The data source. public DataTable DataSource { get { return _dataSource; } set { _dataSource = value; } } /// /// 绑定数据 /// public override void DataBind() { this.Nodes.Clear(); this.ShowCheckBox = this.CheckBoxName != "" && this.CheckBoxName != null; if (_dataSource != null) { TreeNode root_node = new TreeNode(); root_node.Value = "-1"; root_node.Text = "根目录"; Nodes.Add(root_node); List root_list = new List(); for (int i = 0; i < _dataSource.Rows.Count; i++) { TreeNode node = new TreeNode(); DataRow dr = _dataSource.Rows[i]; node.Value = dr[_valueField].ToString(); node.Text = dr[_textField].ToString(); node.SelectAction = TreeNodeSelectAction.None; //node.Depth =int.Parse(_showLevel); if (_onBind != null) { _onBind(node); } if (dr[_fatherField].ToString() == "-1" || dr[_fatherField].ToString() == "0") { Nodes.Add(node); if (node.Value == _checkedValue) { node.Checked = true; } int has = 0; for (int j = 0; j < root_list.Count; j++) { if (root_list[j] == int.Parse(node.Value)) { has = 1; } } if (has == 0) { root_list.Add(int.Parse(node.Value)); } } else { TreeNode father_node = GetNode(root_node, dr[_fatherField].ToString()); if (father_node != null) { father_node.ChildNodes.Add(node); if (node.Value == _checkedValue) { node.Checked = true; } } } } //绑定事件,自动勾选父级节点 if (this.CheckParentType == 0 || this.CheckChildType == 0) { string enterjvice = ""; if (this.CheckParentType == 0) { enterjvice += "FatherChecked"; } if (this.CheckChildType == 0) { enterjvice += "ChildChecked"; } if (enterjvice != "" && this.Nodes.Count > 0) { this.Attributes.Add("onclick", "JscAutoCheckedNode(this,'" + enterjvice + "');"); } } } base.DataBind(); } /// /// 构建HTML /// /// The object that receives the server control content. protected override void Render(HtmlTextWriter writer) { string[] style_list = new string[] { "admin_tree", "data_tree", "input_tree", "menu_tree", "popmenu_tree" }; switch (_styleName) { case "menu_tree": this.ShowCheckBox = false; this.CssClass += " menu"; break; case "popmenu_tree": this.

Public @ 2023-02-24 22:25:29

我不想我的网站被Baiduspider访问,我该怎么做?

Baiduspider遵守互联网robots协议。您可以利用robots.txt文件完全禁止Baiduspider访问您的网站,或者禁止 Baiduspider访问您网站上的部分文件。 注意:禁止Baiduspider访问您的网站,将使您的网站上的网页,在百度搜索引擎以及所有百度提供搜索引擎服务的搜索引擎中无法被搜索到。关于 robots.txt的写作方法,请参看我们的介绍:robots.txt写

Public @ 2017-02-03 15:38:41

搜索引擎蜘蛛对于网站抓取是否很智能?如何引导蜘蛛?

尽管搜索引擎在不断的升级算法,但是终究其还是程序,因此我们在布局网站结构的时候要尽可能的让搜索引擎蜘蛛能看的懂。每个搜索引擎蜘蛛都有自己的名字,在抓取网页的时候,都会向网站标明自己的身份。搜索引擎蜘蛛在抓取网页的时候会发送一个请求,这个请求中就有一个字段为User-agent,用于标识此搜索引擎蜘蛛的身份。例如Google搜索引擎蜘蛛的标识为GoogleBot,百度搜索引擎蜘蛛的标识为Baidu

Public @ 2020-07-03 16:22:36

网站抓取了一些不存在的目录跟页面?

网站管理者可以使用301重定向来解决这个问题,该技术会将搜索结果重定向到有效的页面,从而避免访问不存在的页面,提高网站的加载速度。此外,网站管理者可以使用网络爬虫进行定期的审查,以发现不存在的目录和页面,以及确保符合标准的内容。

Public @ 2023-02-24 11:00:15

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