如何从xhr响应中读取二进制数据

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使用javascript。我发送一个xhr请求到服务器，所以我收到一个xhr响应，其中包含一个多部分数据，第二部分包含可下载文件（pdf，png，office文档）如何从xhr响应中读取二进制数据

in xhr.response我得到这个：

--_NextPart_000_0002_01C3E1CC.3BB37320 
Content-type: application/xml; charset=UTF-8 
<ns0:sendAttachmentOutput xmlns:ns0="http://****/webservices/definition/BDS/AttachmentFileStorage/sendAttachmentOutput/1"> 
    <ns0:msgCode>BDS0000</ns0:msgCode> 
    <ns0:msgLibelle>Pièce jointe envoyée</ns0:msgLibelle> 
</ns0:sendAttachmentOutput> 
--_NextPart_000_0002_01C3E1CC.3BB37320 
Content-disposition: attachment; filename="testsza.xlsx" 
Content-type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet 

PK  ! |lؖl  [Content_Types].xml (                                                                                                                              ]Kðǯ��4٦Ɉ۝珈Ω֦!'ܛ࠷4zԐ杷}Ҵ఼jLքZق��`KǴݕ�՟ҌôJg [email protected]]^ȫّ؅Õ1̡҈݇K3Ջ͌��̲.g ޞͨݍ`c[ 
6>@%&fϫ`ѥ��̠ӻċʔ,κ擯8uƚ̵ǫàÓ]��Ԃl"C|֍aȕ.͟ݛԮ˴ ʕˆv# ֠ѱ<ͼҚi蟙ŝ_>ң퟿�����$I爁`\3ж#z̹ցիԔgĮѤ8ϔ(N߅]d՝٧!Qþ4ڮࠞҒ鵃oןڼS:݅˗ѧ ��PK  ! ֕0#��L _rels/.rels (                                                                                                                                ̒ЎðǯH݃弪nHe܌HۡT$ͣ[email protected]��Êcܑ��[߮窔b/Nú(Aѳb{تx͟Vb"giǚΜaWޞl_xĔܢػȲˋڔ��OѰQˡhѓɥܔ彆ߞP-<ցj{ʾ״Mox/羢؎̀ޓ;̶愦ʏۨۂ̉Õʻ"cަۜO��q"KʐH᳼ߊ[email protected]쫁.ࠨʸގ<⧄⎤T_ ��PK  ! މ�� ԃ xl/_rels/workbook.xml.rels (                                                                ܓЪðǯýđ}qӮeԺ݌AЛ��㑄6׶'o?ԃۀɮWä��ȽᨯėjޕХ)ԥۨ̚<àֶҝӨ`@ÃqؿĎs$%Ǚ襤Ӡϩqmݔ.��궹֍ʼMײ��ƩΕð̶ NÏ 
--_NextPart_000_0002_01C3E1CC.3BB37320

我想提取从PK开始的二进制数据。

这里是我写的代码：

xhr.responseType = "arraybuffer"; 
     xhr.onload = function (e) { 
      var arraybuffer = xhr.response; 
      var fileArray = new Uint8Array(arraybuffer); 
var type = xhr.getResponseHeader('Content-Type'); 
      var boundary; 
      if (type.indexOf('boundary') != -1) { 
       boundary = type.substring(type.indexOf('boundary') + 9); 
      } 
      var temp = holder.split('--' + boundary); 
      var parts = []; 
      //loop through array to remove empty parts 
      for (var i = 0; i < temp.length; i++) { 
       if (temp[i] != "") { 
        parts.push(temp[i]); 
       } 
      } 

var type = parts[2].substring(parts[2].lastIndexOf('Content-type: ') + 14, parts[2].indexOf('\n', parts[2].lastIndexOf('Content-type: ')) - 1); 
       var filename = parts[2].substring(parts[2].indexOf('Content-disposition: attachment; filename="') + 43, parts[2].indexOf('\n', parts[2].indexOf('Content-disposition: attachment; filename="')) - 2); 
       var lastBoundary = holder.lastIndexOf(boundary) - 4; 
       //PARSE SECOND PART 

       //var fileStart = holder.indexOf('Content-disposition: attachment; filename="') + 43 + filename.length + 5;

// ***** fileStart应有的二进制数据的开头索引，othehrwise应该从“PK”开始，只是在后content-type line

   //start point to the end of the array 
       var file = fileArray.buffer.slice(fileStart, lastBoundary); 

       if (!file || 0 === file.byteLength) { 
        _displayError("Pdf introuvable"); 
       } 
       else if (type == "text/html;charset=UTF-8") { 
        _displayError("Erreur de téléchargement du pdf. Veuillez contacter l'administrateur."); 
       } 
       else { 
        var blob = new Blob([file], 
        { 
         type: type 
        });

我该怎么做？

来源

2016-11-22 sadzag

您下载的东西实际上是一个经常被发送到服务器的多域主体？ – Endless

我找到了正确的filestart表达：

var fileStart = holder.indexOf('Content-type: ', holder.indexOf('Content-disposition: ')) + type.length +18;

来源

2016-11-23 09:27:36 sadzag

如何从xhr响应中读取二进制数据

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