C#图片批量下载Demo

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;
}
}
}


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<ImgInfo> ltImgInfo = new List<ImgInfo>();
 
        bool saveImg = false;
 
        private void frmMain_Load(object sender, EventArgs e)
        {
            startupPath = System.Windows.Forms.Application.StartupPath;
 
            ServicePointManager.Expect100Continue = false;
            ServicePointManager.DefaultConnectionLimit = 512;
        }
 
        /// <summary>
        /// 选择表格
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        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<string> list = new List<string>();
                    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()
                    );
            }));
        }
 
        /// <summary>
        /// 下载识别
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        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);
        }
 
        /// <summary>
        /// 停止
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            cts.Cancel();
            btnStop.Enabled = false;
            btnStart.Enabled = true;
 
            chkSaveImg.Enabled = true;
        }
    }
}

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原文地址：https://blog.csdn.net/lw112190/article/details/140920080