C#图片批量下载Demo

目录

效果

项目

代码

下载

效果

C#图片批量下载

项目

代码

using Aspose.Cells;
using NLog;
using System;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DownloadDemo
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
            NLog.Windows.Forms.RichTextBoxTarget.ReInitializeAllTextboxes(this);
        }

        String startupPath;
        private string excelFileFilter = "表格|*.xlsx;*.xls;";
        private Logger log = NLog.LogManager.GetCurrentClassLogger();
        CancellationTokenSource cts;
        List ltImgInfo = new List();

        bool saveImg = false;

        private void frmMain_Load(object sender, EventArgs e)
        {
            startupPath = System.Windows.Forms.Application.StartupPath;

            ServicePointManager.Expect100Continue = false;
            ServicePointManager.DefaultConnectionLimit = 512;
        }

        ///


        /// 选择表格
        ///
        ///
        ///
        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                OpenFileDialog ofd = new OpenFileDialog();
                ofd.Filter = excelFileFilter;
                if (ofd.ShowDialog() != DialogResult.OK) return;
                string excelPath = ofd.FileName;

                Workbook workbook = new Workbook(excelPath);
                Cells cells = workbook.Worksheets[0].Cells;
                System.Data.DataTable dataTable1 = cells.ExportDataTable(1, 0, cells.MaxDataRow, cells.MaxColumn + 1);//noneTitle

                //遍历
                ltImgInfo.Clear();
                ImgInfo temp;
                int imgCount = 0;
                foreach (DataRow row in dataTable1.Rows)
                {
                    temp = new ImgInfo();
                    temp.id = row[0].ToString();
                    temp.title = row[1].ToString();

                    List list = new List();
                    for (int i = 2; i < cells.MaxColumn + 1; i++)
                    {
                        string tempStr = row[i].ToString();
                        if (!string.IsNullOrEmpty(tempStr))
                        {
                            list.Add(tempStr);
                        }
                    }
                    temp.images = list;
                    imgCount = imgCount + list.Count();
                    ltImgInfo.Add(temp);
                }
                log.Info("解析完毕，一共[" + ltImgInfo.Count + "]条记录，[" + imgCount + "]张图片！");
            }
            catch (Exception ex)
            {
                log.Error("解析表格异常:" + ex.Message);
                MessageBox.Show("解析表格异常:" + ex.Message);
            }
        }

        void ShowCostTime(string total, string ocrNum, long time)
        {
            txtTotal.Invoke(new Action(() =>
            {
                TimeSpan ts = TimeSpan.FromMilliseconds(time);
                txtTotal.Text = string.Format("完成：{0}/{1},用时:{2}"
                    , ocrNum
                    , total
                    , ts.ToString()
                    );
            }));
        }

        ///


        /// 下载
        ///
        ///
        ///
        private void button1_Click(object sender, EventArgs e)
        {
            if (ltImgInfo.Count == 0)
            {
                MessageBox.Show("请先选择表格！");
                return;
            }

            if (!Directory.Exists("img"))
            {
                Directory.CreateDirectory("img");
            }

            if (!Directory.Exists("result"))
            {
                Directory.CreateDirectory("result");
            }

            btnStop.Enabled = true;
            chkSaveImg.Enabled = false;

            if (chkSaveImg.Checked)
            {
                saveImg = true;
            }
            else
            {
                saveImg = false;
            }

            Application.DoEvents();

            cts = new CancellationTokenSource();
            Task.Factory.StartNew(() =>
            {

                int totalCount = ltImgInfo.Count();
                Stopwatch total = new Stopwatch();
                total.Start();  //开始计时
                for (int i = 0; i < ltImgInfo.Count(); i++)
                {

                    //判断是否被取消;
                    if (cts.Token.IsCancellationRequested)
                    {
                        return;
                    }

                    Stopwatch perID = new Stopwatch();
                    perID.Start();//开始计时
                    int imagesCount = ltImgInfo[i].images.Count();
                    for (int j = 0; j < imagesCount; j++)
                    {
                        try
                        {
                            Stopwatch sw = new Stopwatch();
                            sw.Start();  //开始计时
                            HttpWebRequest request = WebRequest.Create(ltImgInfo[i].images[j]) as HttpWebRequest;
                            request.KeepAlive = false;
                            request.ServicePoint.Expect100Continue = false;
                            request.Timeout = 1000;// 1秒
                            request.ReadWriteTimeout = 1000;//1秒

                            request.ServicePoint.UseNagleAlgorithm = false;
                            request.ServicePoint.ConnectionLimit = 65500;
                            request.AllowWriteStreamBuffering = false;
                            request.Proxy = null;

                            request.CookieContainer = new CookieContainer();
                            request.CookieContainer.Add(new Cookie("AspxAutoDetectCookieSupport", "1") { Domain = new Uri(ltImgInfo[i].images[j]).Host });

                            HttpWebResponse wresp = (HttpWebResponse)request.GetResponse();
                            Stream s = wresp.GetResponseStream();
                            Bitmap bmp = (Bitmap)System.Drawing.Image.FromStream(s);
                            s.Dispose();
                            wresp.Close();
                            wresp.Dispose();
                            request.Abort();

                            sw.Stop();
                            log.Info("  " + j + "-->下载用时：" + sw.ElapsedMilliseconds + "毫秒");
                            sw.Restart();

                            if (saveImg)
                            {
                                bmp.Save("img//" + i + "_" + j + ".jpg");
                            }

                        }
                        catch (Exception ex)
                        {
                            log.Error(i + "/" + totalCount + "---->id:" + ltImgInfo[i].id + ",url[" + ltImgInfo[i].images[j] + "],异常：" + ex.Message);
                        }
                    }
                    perID.Stop();
                    log.Info(i + "/" + totalCount + "---->id:" + ltImgInfo[i].id + ",图片张数[" + imagesCount + "],小计用时：" + perID.ElapsedMilliseconds + "毫秒");

                    ShowCostTime(totalCount.ToString(), i.ToString(), total.ElapsedMilliseconds);
                }
                total.Stop();
                log.Info("全部[" + totalCount + "]共计用时：" + total.ElapsedMilliseconds + "毫秒");
            }, TaskCreationOptions.LongRunning);
        }

        ///


        /// 停止
        ///
        ///
        ///
        private void button3_Click(object sender, EventArgs e)
        {
            cts.Cancel();
            btnStop.Enabled = false;
            btnStart.Enabled = true;

            chkSaveImg.Enabled = true;
        }
    }
}

  1. using Aspose.Cells;
  2. using NLog;
  3. using System;
  4. using System.Collections.Generic;
  5. using System.Data;
  6. using System.Diagnostics;
  7. using System.Drawing;
  8. using System.IO;
  9. using System.Linq;
  10. using System.Net;
  11. using System.Threading;
  12. using System.Threading.Tasks;
  13. using System.Windows.Forms;
  14.  
  15. namespace DownloadDemo
  16. {
  17.     public partial class frmMain : Form
  18.     {
  19.         public frmMain()
  20.         {
  21.             InitializeComponent();
  22.             NLog.Windows.Forms.RichTextBoxTarget.ReInitializeAllTextboxes(this);
  23.         }
  24.  
  25.         String startupPath;
  26.         private string excelFileFilter = "表格|*.xlsx;*.xls;";
  27.         private Logger log = NLog.LogManager.GetCurrentClassLogger();
  28.         CancellationTokenSource cts;
  29.         List<ImgInfo> ltImgInfo = new List<ImgInfo>();
  30.  
  31.         bool saveImg = false;
  32.  
  33.         private void frmMain_Load(object sender, EventArgs e)
  34.         {
  35.             startupPath = System.Windows.Forms.Application.StartupPath;
  36.  
  37.             ServicePointManager.Expect100Continue = false;
  38.             ServicePointManager.DefaultConnectionLimit = 512;
  39.         }
  40.  
  41.         /// <summary>
  42.         /// 选择表格
  43.         /// </summary>
  44.         /// <param name="sender"></param>
  45.         /// <param name="e"></param>
  46.         private void button2_Click(object sender, EventArgs e)
  47.         {
  48.             try
  49.             {
  50.                 OpenFileDialog ofd = new OpenFileDialog();
  51.                 ofd.Filter = excelFileFilter;
  52.                 if (ofd.ShowDialog() != DialogResult.OK) return;
  53.                 string excelPath = ofd.FileName;
  54.  
  55.                 Workbook workbook = new Workbook(excelPath);
  56.                 Cells cells = workbook.Worksheets[0].Cells;
  57.                 System.Data.DataTable dataTable1 = cells.ExportDataTable(1, 0, cells.MaxDataRow, cells.MaxColumn + 1);//noneTitle
  58.  
  59.                 //遍历
  60.                 ltImgInfo.Clear();
  61.                 ImgInfo temp;
  62.                 int imgCount = 0;
  63.                 foreach (DataRow row in dataTable1.Rows)
  64.                 {
  65.                     temp = new ImgInfo();
  66.                     temp.id = row[0].ToString();
  67.                     temp.title = row[1].ToString();
  68.  
  69.                     List<string> list = new List<string>();
  70.                     for (int i = 2; i < cells.MaxColumn + 1; i++)
  71.                     {
  72.                         string tempStr = row[i].ToString();
  73.                         if (!string.IsNullOrEmpty(tempStr))
  74.                         {
  75.                             list.Add(tempStr);
  76.                         }
  77.                     }
  78.                     temp.images = list;
  79.                     imgCount = imgCount + list.Count();
  80.                     ltImgInfo.Add(temp);
  81.                 }
  82.                 log.Info("解析完毕，一共[" + ltImgInfo.Count + "]条记录，[" + imgCount + "]张图片！");
  83.             }
  84.             catch (Exception ex)
  85.             {
  86.                 log.Error("解析表格异常:" + ex.Message);
  87.                 MessageBox.Show("解析表格异常:" + ex.Message);
  88.             }
  89.         }
  90.  
  91.         void ShowCostTime(string total, string ocrNum, long time)
  92.         {
  93.             txtTotal.Invoke(new Action(() =>
  94.             {
  95.                 TimeSpan ts = TimeSpan.FromMilliseconds(time);
  96.                 txtTotal.Text = string.Format("完成：{0}/{1},用时:{2}"
  97.                     , ocrNum
  98.                     , total
  99.                     , ts.ToString()
  100.                     );
  101.             }));
  102.         }
  103.  
  104.         /// <summary>
  105.         /// 下载识别
  106.         /// </summary>
  107.         /// <param name="sender"></param>
  108.         /// <param name="e"></param>
  109.         private void button1_Click(object sender, EventArgs e)
  110.         {
  111.             if (ltImgInfo.Count == 0)
  112.             {
  113.                 MessageBox.Show("请先选择表格！");
  114.                 return;
  115.             }
  116.  
  117.             if (!Directory.Exists("img"))
  118.             {
  119.                 Directory.CreateDirectory("img");
  120.             }
  121.  
  122.             if (!Directory.Exists("result"))
  123.             {
  124.                 Directory.CreateDirectory("result");
  125.             }
  126.  
  127.             btnStop.Enabled = true;
  128.             chkSaveImg.Enabled = false;
  129.  
  130.             if (chkSaveImg.Checked)
  131.             {
  132.                 saveImg = true;
  133.             }
  134.             else
  135.             {
  136.                 saveImg = false;
  137.             }
  138.  
  139.             Application.DoEvents();
  140.  
  141.             cts = new CancellationTokenSource();
  142.             Task.Factory.StartNew(() =>
  143.             {
  144.  
  145.                 int totalCount = ltImgInfo.Count();
  146.                 Stopwatch total = new Stopwatch();
  147.                 total.Start();  //开始计时
  148.                 for (int i = 0; i < ltImgInfo.Count(); i++)
  149.                 {
  150.  
  151.                     //判断是否被取消;
  152.                     if (cts.Token.IsCancellationRequested)
  153.                     {
  154.                         return;
  155.                     }
  156.  
  157.                     Stopwatch perID = new Stopwatch();
  158.                     perID.Start();//开始计时
  159.                     int imagesCount = ltImgInfo[i].images.Count();
  160.                     for (int j = 0; j < imagesCount; j++)
  161.                     {
  162.                         try
  163.                         {
  164.                             Stopwatch sw = new Stopwatch();
  165.                             sw.Start();  //开始计时
  166.                             HttpWebRequest request = WebRequest.Create(ltImgInfo[i].images[j]) as HttpWebRequest;
  167.                             request.KeepAlive = false;
  168.                             request.ServicePoint.Expect100Continue = false;
  169.                             request.Timeout = 1000;// 1秒
  170.                             request.ReadWriteTimeout = 1000;//1秒
  171.  
  172.                             request.ServicePoint.UseNagleAlgorithm = false;
  173.                             request.ServicePoint.ConnectionLimit = 65500;
  174.                             request.AllowWriteStreamBuffering = false;
  175.                             request.Proxy = null;
  176.  
  177.                             request.CookieContainer = new CookieContainer();
  178.                             request.CookieContainer.Add(new Cookie("AspxAutoDetectCookieSupport", "1") { Domain = new Uri(ltImgInfo[i].images[j]).Host });
  179.  
  180.                             HttpWebResponse wresp = (HttpWebResponse)request.GetResponse();
  181.                             Stream s = wresp.GetResponseStream();
  182.                             Bitmap bmp = (Bitmap)System.Drawing.Image.FromStream(s);
  183.                             s.Dispose();
  184.                             wresp.Close();
  185.                             wresp.Dispose();
  186.                             request.Abort();
  187.  
  188.                             sw.Stop();
  189.                             log.Info("  " + j + "-->下载用时：" + sw.ElapsedMilliseconds + "毫秒");
  190.                             sw.Restart();
  191.  
  192.                             if (saveImg)
  193.                             {
  194.                                 bmp.Save("img//" + i + "_" + j + ".jpg");
  195.                             }
  196.  
  197.                         }
  198.                         catch (Exception ex)
  199.                         {
  200.                             log.Error(i + "/" + totalCount + "---->id:" + ltImgInfo[i].id + ",url[" + ltImgInfo[i].images[j] + "],异常：" + ex.Message);
  201.                         }
  202.                     }
  203.                     perID.Stop();
  204.                     log.Info(i + "/" + totalCount + "---->id:" + ltImgInfo[i].id + ",图片张数[" + imagesCount + "],小计用时：" + perID.ElapsedMilliseconds + "毫秒");
  205.  
  206.                     ShowCostTime(totalCount.ToString(), i.ToString(), total.ElapsedMilliseconds);
  207.                 }
  208.                 total.Stop();
  209.                 log.Info("全部[" + totalCount + "]共计用时：" + total.ElapsedMilliseconds + "毫秒");
  210.             }, TaskCreationOptions.LongRunning);
  211.         }
  212.  
  213.         /// <summary>
  214.         /// 停止
  215.         /// </summary>
  216.         /// <param name="sender"></param>
  217.         /// <param name="e"></param>
  218.         private void button3_Click(object sender, EventArgs e)
  219.         {
  220.             cts.Cancel();
  221.             btnStop.Enabled = false;
  222.             btnStart.Enabled = true;
  223.  
  224.             chkSaveImg.Enabled = true;
  225.         }
  226.     }
  227. }

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