ftp得到的流转base64图片

Question

FtpWebRequest reqFTP;
        string ftpUrl = "ftp://a.png";
        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpUrl));
        reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
        reqFTP.UseBinary = true;
        reqFTP.Credentials = new NetworkCredential("123", "123456");
        reqFTP.UsePassive = false; 
        reqFTP.KeepAlive = false;
        FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
        Stream ftpStream = response.GetResponseStream();

        MemoryStream mStream = new MemoryStream();
        ftpStream.CopyTo(mStream);
        byte[] arr = new byte[mStream.Length];
        mStream.Position = 0;
        mStream.Read(arr, 0, (int)mStream.Length);

        byte[] bytes = mStream.GetBuffer();
        string base64 = Convert.ToBase64String(bytes);
        mStream.Close();
        return base64; 

                    得到的base64图片，在前端显示不出来

Answer 1

Java将二进制流转Base64字符串并在页面显示（附Base64转二进制流）

java代码如下：

/**

 * 二进制流转Base64字符串
 *
 * @param data 二进制流
 * @return data
 * @throws IOException 异常
 */
public static String getImageString(byte[] data) throws IOException {
    BASE64Encoder encoder = new BASE64Encoder();
    return data != null ? encoder.encode(data) : "";
}


/**
 * Base64字符串转 二进制流
 *
 * @param base64String Base64
 * @return base64String
 * @throws IOException 异常
 */
public static byte[] getStringImage(String base64String) throws IOException {
    BASE64Decoder decoder = new sun.misc.BASE64Decoder();
    return base64String != null ? decoder.decodeBuffer(base64String) : null;
}

前台页面代码如下：

前台用的是freemarker模板引擎

<#if (picList??) >

<#list picList as pl>

• 
  style='border:none; padding-right:5px;'/>
  

</#list>

</#if>

效果如图：