C#运用实例.读取csv里面的词条，对每一个词条抓取百度百科相关资料，然后存取到数据库

 

第一步：首先需要将csv先装换成datatable，这样我们就容易进行对datatable进行遍历：

  /// 将CSV文件的数据读取到DataTable中

    /// CSV文件路径

    /// 返回读取了CSV数据的DataTable

    public DataTable OpenCSV(string fileName)

    {

        DataTable dt = new DataTable();

        FileStream fs = new FileStream(fileName, System.IO.FileMode.Open, System.IO.FileAccess.Read);

        StreamReader sr = new StreamReader(fs, System.Text.Encoding.Default);

        //记录每次读取的一行记录

        string strLine = "";

        //记录每行记录中的各字段内容

        string[] aryLine;

        //标示列数

        int columnCount = 0;

        //标示是否是读取的第一行

        bool IsFirst = true;

        //逐行读取CSV中的数据

        while ((strLine = sr.ReadLine()) != null)

        {

            aryLine = strLine.Split(',');

            if (IsFirst == true)

            {

                IsFirst = false;

                columnCount = aryLine.Length;

                //创建列

                for (int i = 0; i < columnCount; i++)

                {

                    DataColumn dc = new DataColumn(aryLine[i]);

                    dt.Columns.Add(dc);

                }

            }

            else

            {

                DataRow dr = dt.NewRow();

                for (int j = 0; j < columnCount; j++)

                {

                    dr[j] = aryLine[j];

                }

                dt.Rows.Add(dr);

            }

        }

        sr.Close();

        fs.Close();

        return dt;

    }

将csv文件转换成datatable

特别备注：遍历dadatable的几种方式已经将datatable装换成csv文件：

一、将DataTable内容写入到CSV文件

        ///



        /// 将DataTable中的数据保存成CSV文件

        ///



        private void btnSaveCSV_Click(object sender, EventArgs e)

        {

            saveFileDialog1.Filter = "CSV文件|*.CSV";

            saveFileDialog1.InitialDirectory = "C:\\";

            if (saveFileDialog1.ShowDialog() == DialogResult.Cancel)

            {

                return;

            }

            else

            {

                string fileName = saveFileDialog1.FileName;

                SaveCSV(ds.Tables[0], fileName);

            }

        }

 

        ///



        /// 将DataTable中数据写入到CSV文件中

        ///



        /// 提供保存数据的DataTable

        /// CSV的文件路径

        public void SaveCSV(DataTable dt, string fileName)

        {

            FileStream fs = new FileStream(fileName, System.IO.FileMode.Create, System.IO.FileAccess.Write);

            StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.Default);

            string data = "";

            //写出列名称

            for (int i = 0; i < dt.Columns.Count; i++)

            {

                data += dt.Columns[i].ColumnName.ToString();

                if (i < dt.Columns.Count - 1)

                {

                    data += ",";

                }

            }

            sw.WriteLine(data);

            //写出各行数据

            for (int i = 0; i < dt.Rows.Count; i++)

            {

                data = "";

                for (int j = 0; j < dt.Columns.Count; j++)

                {

                    data += dt.Rows[i][j].ToString();

                    if (j < dt.Columns.Count - 1)

                    {

                        data += ",";

                    }

                }

                sw.WriteLine(data);

            }

            sw.Close();

            fs.Close();

            MessageBox.Show("CSV文件保存成功！");

        }

 

将datatable转换成csv

遍历datatable的方法2009-09-08 10:02方法一：   

DataTable dt = dataSet.Tables[0];   

for(int i = 0 ; i < dt.Rows.Count ; i++)   

{   

   string strName = dt.Rows[i]["字段名"].ToString();   

}   

  

方法二：   

foreach(DataRow myRow in myDataSet.Tables["temp"].Rows)   

{   

      var str = myRow[0].ToString();   

}   

  

方法三：   

foeach(DataRow dr in dt.Rows)      

{      

     object value = dr["ColumnsName"];      

}   

  

方法四：   

DataTable dt=new DataTable();      

foreach(DataRow dr in dt.Rows)      

{    

   for(int i=0;i<dt.Columns.Count;i++)    

   {    

dr[i];    

   }      

}   

  

 

方法五

DataRow[] dataRows = null;

dataRows = dataTable.Select(fieldParentID + "='" + treeNode.Tag.ToString() + "'", dataTable.DefaultView.Sort);

foreach (DataRow dataRow in dataRows)

{ 



     DataRow dataRow = dataTable.Rows[i]; 



     ?? = dataRow[fieldParentID].ToString();

} 

遍历datatable的几种方式

第二步呢： 就是必须用到post方式提交啦，

    /// <summary> /// post数据请求，返回html代码 /// </summary> /// <param name="areaName">输入百科词条</param> /// <returns></returns> public string UrlPost(string areaName) { Encoding encoding = Encoding.GetEncoding("UTF-8"); Stream outstream = null; Stream instream = null; StreamReader sr = null; string url = "http://baike.baidu.com/search/word?word=" + areaName; HttpWebRequest request = null; HttpWebResponse response = null; // 准备请求,设置参数  request = WebRequest.Create(url) as HttpWebRequest; request.Method = "POST"; //request.ContentType = "application/x-www-form-urlencoded"; request.ContentType = "text/xml";//注意了，上面的那种方式不可采用，因为当遇到xml格式的就会报远程服务器错误。500 byte[] data = encoding.GetBytes(url); request.ContentLength = data.Length; outstream = request.GetRequestStream(); outstream.Write(data, 0, data.Length); outstream.Flush(); outstream.Close(); //发送请求并获取相应回应数据  response = request.GetResponse() as HttpWebResponse; //直到request.GetResponse()程序才开始向目标网页发送Post请求  instream = response.GetResponseStream(); sr = new StreamReader(instream, encoding); //返回结果网页(html)代码 string content = sr.ReadToEnd(); return content; }

post方式请求数据返回html数据

 第三部，就是遍历datatable，然后遍历出每个关键字，以post方式提交到百度百科，返回html，然后用正则表达式进行对数据的筛选

    /// <summary>

    /// 点击按钮执行程序

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="e"></param>

    protected void btn_click_Click(object sender, EventArgs e)

    {

        DataTable dts = OpenCSV("C:\\Users\\kingtopinfo\\Desktop\\CITYLOCATION.csv");

       

        foreach (DataRow dr in dts.Rows)

        {

            string sql = "";

            string regstr = "";

            string regspit = "";

            string Title, Content = "";

            int Id = Convert.ToInt32(dr["ID"].ToString());

            int CityId = Convert.ToInt32(dr["CITYID"].ToString());

            decimal Latitude = Convert.ToDecimal(dr["LATITUDE"]);

            decimal Longitude = Convert.ToDecimal(dr["LONGITUDE"]);

            //提交数据给页面并返回html

            string value = dr["CITYNAME"].ToString();

            string html = UrlPost(value);

            //对数据进行处理。

            Regex reg = new Regex(@"<div class=""biItemInner"">(\s|\S)+?(<\/div>\s*?)");

            MatchCollection mc = reg.Matches(html);

            foreach (Match m in mc)

            {

                regspit += Regex.Replace(Regex.Replace(m.Value, @"</div[^>]*>", ":"), @"</span[^>]*>", ",");

               

            }

            regstr = Regex.Replace(regspit, @"</?div[^>]*>|</?span[^>]*>|</?a[^>]*>|&nbsp;", "");

            string[] area = Regex.Split(regstr, ":", RegexOptions.IgnoreCase);

            foreach (string i in area)

            {

                string[] areaspit = i.Split(',');

                if (areaspit.Length==2)

                {

                    Title = areaspit[0];

                    Content = areaspit[1];

                    SqlParameter[] paras = { 

                                           new SqlParameter("@Id", Id),

                                           new SqlParameter("@cityId", CityId),

                                           new SqlParameter("@latitude", Latitude),

                                           new SqlParameter("@longitude", Longitude),

                                           new SqlParameter("@cityName", value),

                                           new SqlParameter("@title", Title),

                                           new SqlParameter("@content", Content ),

                                           };

                   

                    sql = "INSERT INTO chinaarea(ID,CITYID,LATITUDE,LONGITUDE,CITYNAME,TITLE,CONTENT) VALUES (@Id,@cityId,@latitude,@longitude,@cityName,@title,@content)";

                    SaveSql(sql,paras);

               

                }

                   

                 

            }

        }

    }

遍历表格，发送请求，正则筛选，存入数据库

第四部分，就是数据库的操作了

const string connString = @"Data Source =.;Database = Area;Integrated Security=True";



  /// <summary>

    /// 存入数据库

    /// </summary>

    /// <param name="str"></param>

    public void SaveSql(string str,SqlParameter[] para)

    {

        SqlConnection conn = new SqlConnection(connString);

        conn.Open();

        string mysql = str;

        SqlCommand cmd = new SqlCommand(mysql, conn);

        cmd.Parameters.AddRange(para);

        cmd.ExecuteNonQuery();

        conn.Close();

    }

数据库操作

　此外，这里对正则表达式进行解释

　因为返回的都是这种类型的数据，而我们需要得到的是里面的内容，所以采取正则匹配和替换

<div class="biItem"><div class="biItemInner"><span class="biTitle">中文名称</span><div class="biContent">北京</div></div></div>

<div class="biItem"><div class="biItemInner"><span class="biTitle">外文名称</span><div class="biContent">Beijing</div></div></div>

 Regex reg = new Regex(@"<div class=""biItemInner"">(\s|\S)+?(<\/div>\s*?)");     找出<div class="biItemInner"><div>里的内容

Regex.Replace(Regex.Replace(m.Value, @"</div[^>]*>", ":"), @"</span[^>]*>", ","); 对div和span进行替换和以：分组（便于之后数据处理）

Regex.Replace(regspit, @"</?div[^>]*>|</?span[^>]*>|</?a[^>]*>|&nbsp;", ""); 将regspit里面&nbsp 还有a标签进行替换（也就是去掉里面的这些标签）

 

最终的代码整合：

 

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data; using System.Data.SqlClient; using System.Text; using System.IO; using System.Net; using System.Text.RegularExpressions; public partial class csv : System.Web.UI.Page { const string connString = @"Data Source =.;Database = Area;Integrated Security=True"; protected void Page_Load(object sender, EventArgs e) { } /// <summary> /// 点击按钮执行程序 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void btn_click_Click(object sender, EventArgs e) { DataTable dts = OpenCSV("C:\\Users\\kingtopinfo\\Desktop\\CITYLOCATION.csv"); foreach (DataRow dr in dts.Rows) { string sql = ""; string regstr = ""; string regspit = ""; string Title, Content = ""; int Id = Convert.ToInt32(dr["ID"].ToString()); int CityId = Convert.ToInt32(dr["CITYID"].ToString()); decimal Latitude = Convert.ToDecimal(dr["LATITUDE"]); decimal Longitude = Convert.ToDecimal(dr["LONGITUDE"]); //提交数据给页面并返回html string value = dr["CITYNAME"].ToString(); string html = UrlPost(value); //对数据进行处理。 Regex reg = new Regex(@"<div class=""biItemInner"">(\s|\S)+?(<\/div>\s*?)"); MatchCollection mc = reg.Matches(html); foreach (Match m in mc) { regspit += Regex.Replace(Regex.Replace(m.Value, @"</div[^>]*>", ":"), @"</span[^>]*>", ","); } regstr = Regex.Replace(regspit, @"</?div[^>]*>|</?span[^>]*>|</?a[^>]*>|&nbsp;", ""); string[] area = Regex.Split(regstr, ":", RegexOptions.IgnoreCase); foreach (string i in area) { string[] areaspit = i.Split(','); if (areaspit.Length==2) { Title = areaspit[0]; Content = areaspit[1]; SqlParameter[] paras = { new SqlParameter("@Id", Id), new SqlParameter("@cityId", CityId), new SqlParameter("@latitude", Latitude), new SqlParameter("@longitude", Longitude), new SqlParameter("@cityName", value), new SqlParameter("@title", Title), new SqlParameter("@content", Content ), }; sql = "INSERT INTO chinaarea(ID,CITYID,LATITUDE,LONGITUDE,CITYNAME,TITLE,CONTENT) VALUES (@Id,@cityId,@latitude,@longitude,@cityName,@title,@content)"; SaveSql(sql,paras); } } } } /// 将CSV文件的数据读取到DataTable中 /// CSV文件路径 /// 返回读取了CSV数据的DataTable public DataTable OpenCSV(string fileName) { DataTable dt = new DataTable(); FileStream fs = new FileStream(fileName, System.IO.FileMode.Open, System.IO.FileAccess.Read); StreamReader sr = new StreamReader(fs, System.Text.Encoding.Default); //记录每次读取的一行记录 string strLine = ""; //记录每行记录中的各字段内容 string[] aryLine; //标示列数 int columnCount = 0; //标示是否是读取的第一行 bool IsFirst = true; //逐行读取CSV中的数据 while ((strLine = sr.ReadLine()) != null) { aryLine = strLine.Split(','); if (IsFirst == true) { IsFirst = false; columnCount = aryLine.Length; //创建列 for (int i = 0; i < columnCount; i++) { DataColumn dc = new DataColumn(aryLine[i]); dt.Columns.Add(dc); } } else { DataRow dr = dt.NewRow(); for (int j = 0; j < columnCount; j++) { dr[j] = aryLine[j]; } dt.Rows.Add(dr); } } sr.Close(); fs.Close(); return dt; } /// <summary> /// 存入数据库 /// </summary> /// <param name="str"></param> public void SaveSql(string str,SqlParameter[] para) { SqlConnection conn = new SqlConnection(connString); conn.Open(); string mysql = str; SqlCommand cmd = new SqlCommand(mysql, conn); cmd.Parameters.AddRange(para); cmd.ExecuteNonQuery(); conn.Close(); } /// <summary> /// post数据请求，返回html代码 /// </summary> /// <param name="areaName">输入百科词条</param> /// <returns></returns> public string UrlPost(string areaName) { Encoding encoding = Encoding.GetEncoding("UTF-8"); Stream outstream = null; Stream instream = null; StreamReader sr = null; string url = "http://baike.baidu.com/search/word?word=" + areaName; HttpWebRequest request = null; HttpWebResponse response = null; // 准备请求,设置参数  request = WebRequest.Create(url) as HttpWebRequest; request.Method = "POST"; //request.ContentType = "application/x-www-form-urlencoded"; request.ContentType = "text/xml";//注意了，上面的那种方式不可采用，因为当遇到xml格式的就会报远程服务器错误。500 byte[] data = encoding.GetBytes(url); request.ContentLength = data.Length; outstream = request.GetRequestStream(); outstream.Write(data, 0, data.Length); outstream.Flush(); outstream.Close(); //发送请求并获取相应回应数据  response = request.GetResponse() as HttpWebResponse; //直到request.GetResponse()程序才开始向目标网页发送Post请求  instream = response.GetResponseStream(); sr = new StreamReader(instream, encoding); //返回结果网页(html)代码 string content = sr.ReadToEnd(); return content; } }

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