ftp断点下载(多线程)

最新推荐文章于 2025-05-21 09:18:44 发布

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最新推荐文章于 2025-05-21 09:18:44 发布 · 1k 阅读

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#ftp #断点下载 #多线程

本文深入探讨了FTP断点下载的概念，详细解释了如何利用多线程技术提高下载效率。通过实例分析，阐述了在遇到网络中断或资源限制时，如何继续从上次停止的位置恢复下载，确保文件完整性的关键步骤。同时，讨论了多线程在FTP下载中的应用，以及如何优化线程管理和数据同步策略以提升下载速度。

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Windows.Forms;
using System.Threading;

namespace SoulWorkerDownload
{
    /// <summary>
    /// FTP文件上传下载
    /// </summary>
    public class FileUpDownload
    {

        #region 变量属性

        private Thread m_thread_Download = null;

        /// <summary>
        /// Ftp服务器ip
        /// </summary>
        private string FtpServerIP = string.Empty;
        /// <summary>
        /// Ftp 指定用户名
        /// </summary>
        private string FtpUserID = string.Empty;
        /// <summary>
        /// Ftp 指定用户密码
        /// </summary>
        private string FtpPassword = string.Empty;

        /// <summary>
        /// 远端文件名
        /// </summary>
        private string remoteFileName = string.Empty;

        /// <summary>
        /// 本地文件名
        /// </summary>
        private string localFileName = string.Empty;

        public string LocalFileName
        {
            get { return localFileName; }
            set {  localFileName = value; }
        }

        private MainForm mainform;


        /// <summary>
        /// 更新进度条
        /// </summary>
        public Action< long> updateProgress;

        #endregion

        #region 从FTP服务器下载文件，指定本地路径和本地文件名

        public FileUpDownload(string IP, string userID, string userPassword,string targetFileName,string saveFileName,MainForm form)
        {
            FtpServerIP = IP;
            FtpUserID = userID;
            FtpPassword = userPassword;
            remoteFileName = targetFileName;
            localFileName = saveFileName;
            mainform = form;
        }

        public void StartSingleDownload()
        {
            m_thread_Download = new Thread(new ThreadStart(FtpDownloadFile));
            m_thread_Download.SetApartmentState(ApartmentState.STA);
            m_thread_Download.Priority = ThreadPriority.Highest;
            m_thread_Download.Start();
        }

        /// <summary>
        /// 停止下载
        /// </summary>
        public void AbortSingleDownload()
        {
            if (m_thread_Download != null && m_thread_Download.IsAlive )
            {
                if (m_thread_Download.ThreadState == ThreadState.Suspended)
                    m_thread_Download.Resume();

                //if(Step.CURRENT_STEP != Step.State._ProcessState_Restart)
                    m_thread_Download.Abort();
            }
        }

        /// <summary>
        /// 暂停。挂起线程，或者如果线程已挂起，则不起作用
        /// </summary>
        /// <param name="_parameter"></param>
        public void SuspendSingleDownload()
        {
            if (m_thread_Download != null && m_thread_Download.IsAlive == true)
            {
                m_thread_Download.Suspend();
            }
        }

        public void ResumeSingleDownload()
        {
            bool isAlive = m_thread_Download.IsAlive;
            ThreadState state = m_thread_Download.ThreadState;

            if (m_thread_Download != null)
            {
                m_thread_Download.Resume();
            }
        }

        /// <summary>
        /// 判断线程是否结束
        /// </summary>
        public bool IsAbortThreadOrStop()
        {
            bool isAbort = fals