如何下载文件？ - Groovy [英] How to download a file? - Groovy

问题描述

我需要下载一个文件（例如： https://www.betaseries.com/ srt / 391160 ），所以我在网上找到了不同的方法：

I need to download a file (this one for example: https://www.betaseries.com/srt/391160) so I have found different methods on the web:

def download(String remoteUrl, String localUrl)
{
    def file = new FileOutputStream(localUrl)
    def out = new BufferedOutputStream(file)
    out << new URL(remoteUrl).openStream()
    out.close()
}

或

def download(String remoteUrl, String localUrl) {
  new File("$localUrl").withOutputStream { out ->
      new URL(remoteUrl).withInputStream { from ->  out << from; }
  }
}

我看到该文件已创建，但文件大小总是等于1KB我怎么能fx？

I see that the file is created but the file size is always equal to 1KB how can I fx it?

提前感谢

本杰明

推荐答案

所以，它看起来像url https://www.betaseries.com/srt/391160 重定向到 http： //www.betaseries.com/srt/391160 （http，而不是https）

So, it looks like the url https://www.betaseries.com/srt/391160 redirects to http://www.betaseries.com/srt/391160 (http, not https)

所以你抓住的是重定向响应（1K）

So what you're grabbing is the redirect response (1K) not the full response image.

您可以这样做来获取实际图像：

You can do this to get the actual image:

def redirectFollowingDownload( String url, String filename ) {
  while( url ) {
    new URL( url ).openConnection().with { conn ->
      conn.instanceFollowRedirects = false
      url = conn.getHeaderField( "Location" )      
      if( !url ) {
        new File( filename ).withOutputStream { out ->
          conn.inputStream.with { inp ->
            out << inp
            inp.close()
          }
        }
      }
    }
  }
}

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