找个搜索结果总数原来可以用到这么多的技术

今天刚刚上班的时候..隔壁同事给分配到个任务.就是做个软件.用可以分析一个关键字在搜索引擎里的搜索总量.

索性自己用Console也弄了个..

源码下载

主要用到下面几种技术:

1.插件模式

2.事件

3.委托

流程:

1.先实例化一个事件

2.检索插件,将找到的插件实例化并传入事件作为参数执行

3.搜索 ->  下载源码,分析,取出搜索结果总数

4.用委托回调每个结果

解决方案结构:

引用:

1.所有的项目都引用Yans.Implementation

2.Yans.Implementation引用System.Web

代码如下:

1.主程序

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Yans.Implementation.Searcher;
using System.IO;
using System.Reflection;

namespace Yans.ConsoleApplication
{
    class Program
    {
        static void Main( string[] args ) { 
            StringBuilder sb = new StringBuilder();
            IndexEvent e = new IndexEvent();

            e.Actions = ( E, Y ) => {
                sb.AppendLine(E.GetType().Name + ":" + Y);
            };

            //获取插件并实例化到事件中
            foreach (var dllFile in Directory.GetFiles(AppDomain.CurrentDomain.BaseDirectory, "*Searcher.dll")) {

                var pluginAssembly = Assembly.LoadFrom(dllFile);

                foreach (var pluginType in pluginAssembly.GetTypes()) {
                    if (pluginType.IsPublic && !pluginType.IsAbstract && pluginType.Name.EndsWith("Searcher")) {
                        try {
                            Activator.CreateInstance(pluginType, e);        //创建实例并传入事件实体作为参数
                        }
                        catch (Exception ex) {
                            Console.WriteLine(ex.Message);
                        }
                    }
                }
            }

            //检索
            e.RaiseSampleEvent("yans"); 
            Console.WriteLine(sb.ToString()); 

            Console.Read();
        }
    }
}

Ps: RaiseSampleEvent是执行搜索..内容请自行修改..

2.调用的事件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;

namespace Yans.Implementation.Searcher
{

    public class CodeAnalyzer
    { 
        /// <summary>
        /// 分析结果
        /// </summary>
        /// <param name="uri">查询地址(设定查询的参数为{0})</param>
        /// <param name="query">查询参数</param>
        /// <param name="pattern">过滤查询结果</param>
        /// <param name="encoding">编码</param>
        /// <returns>分析结果</returns>
        public static string Analyzer( string uri, string query, string pattern, string encoding ) {
            using (var client = new WebClienter()) {
                client.Encoding = Encoding.GetEncoding(encoding);

                //下载源码
                var source = client.DownLoadString(string.Format(uri, HttpUtility.UrlEncode(query, Encoding.GetEncoding(encoding))));

                //分析结果
                Regex myRegex = new Regex(pattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);
                Match myMatch = myRegex.Match(source);
                if (myMatch.Success && myMatch.Groups.Count > 1) {
                    return myMatch.Groups[1].Value;
                }
            }
            return "[未分析到]";
        }
    }

}

Ps:调用下载源码并用正则的方式把要的结果过滤出来.

3.调用的事件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Yans.Implementation.Searcher
{
    //Searcher事件
    public class IndexEvent
    {
        //定义委托
        public delegate void SampleEventHandler( object sender, string e );

        //定义回调
        public Action<object, string> Actions;

        //定义事件
        public event SampleEventHandler SampleEvent;

        //执行事件
        public virtual void RaiseSampleEvent( string word ) {
            if (SampleEvent != null)
                SampleEvent(this, word);
        }
    }
}

Ps:event这东西.会用的话还是很强大的.

4.代码下载类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;

namespace Yans.Implementation.Searcher
{

    public class WebClienter : IDisposable
    {
        #region property

        /// <summary>
        /// 用户身份
        /// </summary>
        public ICredentials Credential { set; get; }

        Encoding encoding = Encoding.UTF8;
        /// <summary>
        /// 下载源编码
        /// </summary>
        public Encoding Encoding {
            set { encoding = value; }
            get { return encoding; }
        }

        #endregion
        /// <summary>
        /// 根据地址下载该网页的源代码
        /// </summary>
        /// <param name="UriAddress"></param>
        /// <returns></returns>
        public string DownLoadString( Uri UriAddress ) {
            WebClient client = new WebClient();
            if (null != Credential) client.Credentials = Credential;
            client.Encoding = Encoding;
            return client.DownloadString(UriAddress);
        }

        /// <summary>
        /// 根据地址下载该网页的源代码
        /// </summary>
        /// <param name="UriAddress"></param>
        /// <returns></returns>
        public string DownLoadString( string UriAddress ) {
            return DownLoadString(new Uri(UriAddress));
        }


        #region IDisposable 成员

        public void Dispose() {
            Encoding = null;
            Credential = null;
        }

        #endregion
    }
}

PS:以前写采集器用过的一个类..稍微对webclient做了一点点的修改..现在直接拿来用了.

5.插件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Yans.Implementation.Searcher;

namespace Yans.Searcher.BaiduSearcher
{
    public class BaiduSearcher
    {
        public BaiduSearcher( IndexEvent e ) {
            e.SampleEvent += new IndexEvent.SampleEventHandler(e_SampleEvent);
        }

        void e_SampleEvent( object sender, string e ) {
            string result = CodeAnalyzer.Analyzer(@"http://www.baidu.com/s?wd={0}", e, @"相关网页约([\d,]*)篇，", "gb2312");
            var searcherEvent = (IndexEvent)sender;
            if (null != searcherEvent.Actions) searcherEvent.Actions(this, result);
            Console.WriteLine("Baidu Searched result count:" + result);
        }

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Yans.Implementation.Searcher;

namespace Yans.Searcher.GoogleSearcher
{
    public class GoogleSearcher
    {
        public GoogleSearcher( IndexEvent e ) {
            e.SampleEvent += new IndexEvent.SampleEventHandler(e_SampleEvent);
        }

        void e_SampleEvent( object sender, string e ) {
            string result = CodeAnalyzer.Analyzer("http://www.google.cn/search?hl=zh-CN&source=hp&q={0}&aq=f&aqi=g10&aql=&oq=", e, @"获得约 <b>([\d,]*)</b> 条结果", "gb2312");
            var searcherEvent = (IndexEvent)sender;
            if (null != searcherEvent.Actions) searcherEvent.Actions(this, result);
            Console.WriteLine("Google searched result count:" + result);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Yans.Implementation.Searcher;

namespace Yans.Searcher.SosoSearcher
{
    public class SosoSearcher
    {
        public SosoSearcher( IndexEvent e ) {
            e.SampleEvent += new IndexEvent.SampleEventHandler(e_SampleEvent);
        }

        void e_SampleEvent( object sender, string e ) {
            string result = CodeAnalyzer.Analyzer("http://www.soso.com/q?pid=s.idx&w={0}", e, @"搜索到约([\d,]*)项结果，用", "gb2312");
            var searcherEvent = (IndexEvent)sender;
            if (null != searcherEvent.Actions) searcherEvent.Actions(this, result);
            Console.WriteLine("Soso searched result count:" + result);
        }
    }
}

Ps:这三个插件都是作为一个独立的项目存在的,如果需要添加新的插件..可以再添加一个项目..生成为dll文件后,放到程序的目录里.就可以直接使用了..

总结:

1.插件模式的原理..我的理解就是让程序去搜索可用的插件,并将其在需要使用的时候实例化..

2.此文也算是扔个砖头引块玉来..  - - 那成语怎么说来着?

3.本程序在VS2010下调用通过..VS2008或VS2005可能会做点修改..