在unity 中，使用http请求，下载文件到可读可写路径
在这里我用了一个线程池，线程池参数接收一个带有object参数的，无返回值的委托 ，下载用到的核心代码，网上拷贝的，他的核心就是发起一个web请求，然后得到请求的响应，读取响应的流
剩下的都是常见的IO操作
由于线程池接参数的委托，接收一个object参数。所以，我把请求地址和本地存放地址以及名字，封装了一个类，用来传参
这是下载工具代码，如下
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Net;
using UnityEngine;
public class DownLoaderEnum
{
public string url;
public string path;
public DownLoaderEnum(string URL, string PATH)
{
url = URL;
path = PATH;
}
}
public class HttpDownload
{
/// <summary>
/// http下载文件
/// </summary>
/// <param name="url">下载文件地址</param>
/// <param name="path">文件存放地址，包含文件名</param>
/// <returns></returns>
public void HttpDownloader(object down)
{
if (!Directory.Exists((down as DownLoaderEnum).path))
Directory.CreateDirectory((down as DownLoaderEnum).path);
string tempPath = System.IO.Path.GetDirectoryName((down as DownLoaderEnum).path) + @" emp";
System.IO.Directory.CreateDirectory(tempPath); //创建临时文件目录
string tempFile = tempPath + @"" + System.IO.Path.GetFileName((down as DownLoaderEnum).path) + ".temp"; //临时文件
if (System.IO.File.Exists(tempFile))
{
System.IO.File.Delete(tempFile); //存在则删除
}
try
{
FileStream fs = new FileStream(tempFile, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
// 设置参数
HttpWebRequest request = WebRequest.Create((down as DownLoaderEnum).url) as HttpWebRequest;
//发送请求并获取相应回应数据
HttpWebResponse 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();
//创建本地文件写入流
//Stream stream = new FileStream(tempFile, FileMode.Create);
byte[] bArr = new byte[1024];
int size = responseStream.Read(bArr, 0, (int)bArr.Length);
while (size > 0)
{
//stream.Write(bArr, 0, size);
fs.Write(bArr, 0, size);
size = responseStream.Read(bArr, 0, (int)bArr.Length);
}
//stream.Close();
fs.Close();
responseStream.Close();
string suffixName = (down as DownLoaderEnum).url;
int su = suffixName.LastIndexOf('/');
suffixName = (down as DownLoaderEnum).path+suffixName.Substring(su);
// Debug.LogError(suffixName);
System.IO.File.Move(tempFile, suffixName);
// return true;
Debug.LogError("下载完成");
}
catch (Exception ex)
{
Debug.LogError("错误==>>" + ex.Message);
//return false;
}
}
}
这是测试代码
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using UnityEngine;
public class NewBehaviourScript : MonoBehaviour {
public string url = "http://dl172.80s.im:920/1802/[比得兔]剧场预告片/[比得兔]剧场预告片_hd.mp4";
// Use this for initialization
string path = "";
HttpDownload download = new HttpDownload();
DownLoaderEnum down;
private void Awake()
{
path = Application.streamingAssetsPath;
//DirectoryInfo directory = new DirectoryInfo(path);
//if (directory.Exists)
// directory.Create();
//Debug.LogError(path);
}
// Use this for initialization
void Start()
{
ThreadPool.SetMaxThreads(5, 5);
down = new DownLoaderEnum(url, path);//请求url，存放地址，存放文件名
}
// Update is called once per frame
void Update()
{
if (Input.GetKeyDown(KeyCode.Space))
{
ThreadPool.QueueUserWorkItem(download.HttpDownloader, down);
}
}
}
可以看到，已经下载完成