HttpWebResponse 流内容的类型

最新推荐文章于 2022-12-07 13:25:57 发布

原创最新推荐文章于 2022-12-07 13:25:57 发布 · 923 阅读

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#html #stream #string

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本文介绍了一种使用Visual Basic .NET从HTTP响应中读取并解压GZIP或Deflate压缩格式网页内容的方法。根据网页的内容编码类型，通过GZipStream或DeflateStream进行解压，最终获取到完整的文本内容。

获取网页内容的时候有的时候返回的是GZIP压缩的

Dim wbres As HttpWebResponse = wbr.GetResponse()

Dim html As String
            Dim compressStream As Stream = Nothing
            Dim streamReader As StreamReader
            If wbres.ContentEncoding.ToLower.Contains("gzip") Then
                compressStream = New GZipStream(wbres.GetResponseStream(), CompressionMode.Decompress)
                streamReader = New StreamReader(compressStream)
                html = streamReader.ReadToEnd()
                compressStream.Close()
                streamReader.Close()
            ElseIf wbres.ContentEncoding.ToLower.Contains("deflate") Then
                compressStream = New DeflateStream(wbres.GetResponseStream(), CompressionMode.Decompress)
                streamReader = New StreamReader(compressStream)
                html = streamReader.ReadToEnd()
                compressStream.Close()
                streamReader.Close()
            Else
                streamReader = New StreamReader(wbres.GetResponseStream())
                html = streamReader.ReadToEnd()
                streamReader.Close()
            End If