C#限速下载网络文件
代码:
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using Common.Utils;
using Utils; namespace 爬虫
{
public partial class Form1 : Form
{
#region 变量
/// <summary>
/// 已完成字节数
/// </summary>
private long completedCount = ;
/// <summary>
/// 是否完成
/// </summary>
private bool isCompleted = true;
/// <summary>
/// 数据块队列
/// </summary>
private ConcurrentQueue<MemoryStream> msQueue = new ConcurrentQueue<MemoryStream>();
/// <summary>
/// 下载开始位置
/// </summary>
private long range = ;
/// <summary>
/// 文件大小
/// </summary>
private long total = ;
/// <summary>
/// 一段时间内的完成节点数,计算网速用
/// </summary>
private long unitCount = ;
/// <summary>
/// 上次计时时间,计算网速用
/// </summary>
private DateTime lastTime = DateTime.MinValue;
/// <summary>
/// 一段时间内的完成字节数,控制网速用
/// </summary>
private long unitCountForLimit = ;
/// <summary>
/// 上次计时时间,控制网速用
/// </summary>
private DateTime lastTimeForLimit = DateTime.MinValue;
/// <summary>
/// 下载文件sleep时间,控制速度用
/// </summary>
private int sleepTime = ;
#endregion #region Form1
public Form1()
{
InitializeComponent();
}
#endregion #region Form1_Load
private void Form1_Load(object sender, EventArgs e)
{
lblMsg.Text = string.Empty;
lblByteMsg.Text = string.Empty;
lblSpeed.Text = string.Empty;
}
#endregion #region Form1_FormClosing
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{ }
#endregion #region btnDownload_Click 下载
private void btnDownload_Click(object sender, EventArgs e)
{
isCompleted = false;
btnDownload.Enabled = false;
string url = txtUrl.Text.Trim();
string filePath = CreateFilePath(url); #region 下载线程
Thread thread = new Thread(new ThreadStart(() =>
{
int tryTimes = ;
while (!HttpDownloadFile(url, filePath))
{
Thread.Sleep(); tryTimes++;
LogUtil.Log("请求服务器失败,重新请求" + tryTimes.ToString() + "次");
this.Invoke(new InvokeDelegate(() =>
{
lblMsg.Text = "请求服务器失败,重新请求" + tryTimes.ToString() + "次";
}));
HttpDownloadFile(url, filePath);
}
}));
thread.IsBackground = true;
thread.Start();
#endregion #region 保存文件线程
thread = new Thread(new ThreadStart(() =>
{
while (!isCompleted)
{
MemoryStream ms;
if (msQueue.TryDequeue(out ms))
{
using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Write))
{
fs.Seek(completedCount, SeekOrigin.Begin);
fs.Write(ms.ToArray(), , (int)ms.Length);
fs.Close();
}
completedCount += ms.Length;
} if (total != && total == completedCount)
{
Thread.Sleep();
isCompleted = true;
} Thread.Sleep();
}
}));
thread.IsBackground = true;
thread.Start();
#endregion #region 计算网速/进度线程
thread = new Thread(new ThreadStart(() =>
{
while (!isCompleted)
{
Thread.Sleep(); if (lastTime != DateTime.MinValue)
{
double sec = DateTime.Now.Subtract(lastTime).TotalSeconds;
double speed = unitCount / sec / ; try
{
#region 显示速度
if (speed < )
{
this.Invoke(new InvokeDelegate(() =>
{
lblSpeed.Text = string.Format("{0}KB/S", speed.ToString("0.00"));
}));
}
else
{
this.Invoke(new InvokeDelegate(() =>
{
lblSpeed.Text = string.Format("{0}MB/S", (speed / ).ToString("0.00"));
}));
}
#endregion #region 显示进度
this.Invoke(new InvokeDelegate(() =>
{
string strTotal = (total / / ).ToString("0.00") + "MB";
if (total < * )
{
strTotal = (total / ).ToString("0.00") + "KB";
}
string completed = (completedCount / / ).ToString("0.00") + "MB";
if (completedCount < * )
{
completed = (completedCount / ).ToString("0.00") + "KB";
}
lblMsg.Text = string.Format("进度:{0}/{1}", completed, strTotal);
lblByteMsg.Text = string.Format("已下载:{0}\r\n总大小:{1}", completedCount, total); if (completedCount == total)
{
MessageBox.Show("完成");
}
}));
#endregion
}
catch { } lastTime = DateTime.Now;
unitCount = ;
}
}
}));
thread.IsBackground = true;
thread.Start();
#endregion #region 限制网速线程
thread = new Thread(new ThreadStart(() =>
{
while (!isCompleted)
{
Thread.Sleep(); if (lastTimeForLimit != DateTime.MinValue)
{
double sec = DateTime.Now.Subtract(lastTimeForLimit).TotalSeconds;
double speed = unitCountForLimit / sec / ; try
{
#region 限速/解除限速
double limitSpeed = ;
if (double.TryParse(txtSpeed.Text.Trim(), out limitSpeed))
{
if (speed > limitSpeed && sleepTime < )
{
sleepTime += ;
}
if (speed < limitSpeed - && sleepTime >= )
{
sleepTime -= ;
}
}
else
{
this.Invoke(new InvokeDelegate(() =>
{
txtSpeed.Text = "";
}));
}
#endregion
}
catch { } lastTimeForLimit = DateTime.Now;
unitCountForLimit = ;
}
}
}));
thread.IsBackground = true;
thread.Start();
#endregion }
#endregion #region HttpDownloadFile 下载文件
/// <summary>
/// Http下载文件
/// </summary>
public bool HttpDownloadFile(string url, string filePath)
{
try
{
if (!File.Exists(filePath))
{
using (FileStream fs = new FileStream(filePath, FileMode.Create))
{
fs.Close();
}
}
else
{
FileInfo fileInfo = new FileInfo(filePath);
range = fileInfo.Length;
} // 设置参数
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0)";
request.Proxy = null;
//发送请求并获取相应回应数据
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
if (response.ContentLength == range)
{
this.Invoke(new InvokeDelegate(() =>
{
lblMsg.Text = "文件已下载";
}));
return true;
} // 设置参数
request = WebRequest.Create(url) as HttpWebRequest;
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0)";
request.Proxy = null;
request.AddRange(range);
//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
Stream responseStream = response.GetResponseStream(); total = range + response.ContentLength;
completedCount = range; MemoryStream ms = new MemoryStream();
byte[] bArr = new byte[];
lastTime = DateTime.Now;
lastTimeForLimit = DateTime.Now;
int size = responseStream.Read(bArr, , (int)bArr.Length);
unitCount += size;
unitCountForLimit += size;
ms.Write(bArr, , size);
while (!isCompleted)
{
size = responseStream.Read(bArr, , (int)bArr.Length);
unitCount += size;
unitCountForLimit += size;
ms.Write(bArr, , size);
if (ms.Length > )
{
msQueue.Enqueue(ms);
ms = new MemoryStream();
}
if (completedCount + ms.Length == total)
{
msQueue.Enqueue(ms);
ms = new MemoryStream();
} Thread.Sleep(sleepTime);
}
responseStream.Close();
return true;
}
catch (Exception ex)
{
LogUtil.LogError(ex.Message + "\r\n" + ex.StackTrace);
return false;
}
}
#endregion #region 根据URL生成文件保存路径
private string CreateFilePath(string url)
{
string path = Application.StartupPath + "\\download";
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
} string fileName = Path.GetFileName(url);
if (fileName.IndexOf("?") > )
{
return path + "\\" + fileName.Substring(, fileName.IndexOf("?"));
}
else
{
return path + "\\" + fileName;
}
}
#endregion } //end Form1类
}
测试截图:
C#限速下载网络文件的更多相关文章
- JAVA多线程下载网络文件
JAVA多线程下载网络文件,开启多个线程,同时下载网络文件. 源码如下:(点击下载 MultiThreadDownload.java) import java.io.InputStream; im ...
- Java读取并下载网络文件
CreateTime--2017年8月21日10:11:07 Author:Marydon import java.io.ByteArrayOutputStream; import java.io ...
- python下载网络文件
python下载网络文件 制作人:全心全意 下载图片 #!/usr/bin/python #-*- coding: utf-8 -*- import requests url = "http ...
- DELPHI TDownLoadURL下载网络文件
DELPHI XE6 FMX 附件:http://files.cnblogs.com/xe2011/IDHttp_fmx.7z unit Unit1; interface uses //引用 Vc ...
- 【python】下载网络文件到本地
# 下载网络图片文件到本地 import urllib.request rsp=urllib.request.urlopen("http://n.sinaimg.cn/ent/transfo ...
- java 下载网络文件
1.FileUtils.copyURLToFile实现: import java.io.File; import java.net.URL; import org.apache.commons.io. ...
- python使用wget下载网络文件
wget是一个从网络上自动下载文件的自由工具.它支持HTTP,HTTPS和FTP协议,可以使用HTTP代理. ubuntu 安装wget pip install wget 从网络或本地硬盘下载文件(并 ...
- 解决FTPClient下载网络文件线程挂起问题
今天在windows上调试FTP下载文件时,出险线程假死,代码如下: if (inputStream != null) { byte[] data = null; ByteArrayOutputStr ...
- 网络编程(一):用C#下载网络文件的2种方法
使用C#下载一个Internet上的文件主要是依靠HttpWebRequest/HttpWebResonse和WebClient.具体处理起来还有同步和异步两种方式,所以我们其实有四种组合. 1.使用 ...
随机推荐
- Mybatis XML配置
Mybatis常用带有禁用缓存的XML配置 <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE ...
- 【Java学习系列】第3课--Java 高级教程
本文地址 可以拜读: 从零开始学 Java 分享提纲: 1. Java数据结构 2. Java 集合框架 3. Java泛型 4. Java序列化 5. Java网络编程 6. Java发送Email ...
- ObserverPattern(观察者模式)
import java.util.ArrayList; import java.util.List; /** * 观察者模式 * @author TMAC-J * 牵一发而动全身来形容观察者模式在合适 ...
- PHP设计模式(二)工厂方法模式(Factory Method For PHP)
简单工厂简述: 简单工厂模式实现了生产产品类的代码跟客户端代码分离,在工厂类中你可以添加需要生成长跑的逻辑代码(new 产品类),但是问题来了,优秀的代码是符合"开闭原则"如果你要 ...
- 【SAP业务模式】之ICS(二):基础数据
讲完业务,计划在前台做一下ICS的基本操作,不过在操作之前,得先建立好基本的基础数据. 1.首先创建接单公司LEON,对应工厂是ADA: 2.创建生产公司MXPL,对应工厂是PL01: 3.创建接单公 ...
- [Hadoop in Action] 第7章 细则手册
向任务传递定制参数 获取任务待定的信息 生成多个输出 与关系数据库交互 让输出做全局排序 1.向任务传递作业定制的参数 在编写Mapper和Reducer时,通常会想让一些地方可以配 ...
- phpstorm 配置 xdebug调试工具
前言 php是脚本型程序 每次出错都要手动exit断点程序不是很方便 哪里有需求哪里就有生产,Xdebug可以实现对php的断点调试.下面将我个人的安装经历分享给大家. 运行环境 windows ...
- NOIP2016纪录[那些我所追求的]
人生第一场正式OI [序] 2016-12-04 见底部 [Day -1] 2016-11-17 期中考试无心插柳柳成荫,考了全市第2班里第1(还不是因为只复习了不到两天考试),马上请了一个周的假准备 ...
- JS高级前端开发群加群说明及如何晋级
JS高级前端开发群加群说明 一.文章背景: 二. 高级群: 三. 加入方式: 四. 说明: 一.文章背景: 去年年初建了几个群,在不经意间火了,一直排在“前端开发”关键字搜索结果第一名.当然取得这 ...
- [模拟电路] 2、Passive Band Pass Filter
note: Some articles are very good in http://www.electronics-tutorials.ws/,I share them in the Cnblog ...