Question

我在Java中有一个Web服务，它以byte[]（字节数组）形式返回所请求的文件内容。有时这些文件是HTML文件，有时它们是图像。它的文件类型没有限制。我正在寻找一种方法将此数组转换为有效的图像/字符串。文字文件正常工作如下：

    $bytes = getArray();
    $string = implode(array_map("chr", $bytes));
    echo $string;

这是echo $string;

的输出

‰PNG  IHDR‘h6   pHYsÄÄ•+ OiCCPPhotoshop ICC profilexÚSgTSé=÷ÞôBKˆ€”KoR RB‹€‘&*! Jˆ!¡ÙQÁEEÈ ˆŽŽ€ŒQ,Š Øä!¢Žƒ£ˆŠÊûá{£kÖ¼÷æÍþµ×>ç¬ó³ÏÀ–H3Q5€©BàƒÇÄÆáä.@ $p³d!sý#ø~<<+"À¾xÓÀM›À0‡ÿêB™\€„Àt‘8K€@zŽB¦@F€˜&S `ËcbãP-`'æÓ€ø™{[”! ‘ eˆDh;¬ÏVŠEX0fKÄ9Ø-0IWfH°·ÀÎ²0Qˆ…){`È##x„™FòW<ñ+®ç*x™²<¹$9E[-qWW.(ÎI+6aaš@.Ây™24àóÌ ‘àƒóýxÎ®ÎÎ6Ž¶_-ê¿ÿ"bbãþåÏ«p@át~Ñþ,/³€;€mþ¢%îh^ u÷‹f²@µ éÚWópø~<ß5°j>{‘-¨]cöK'XtÀâ÷ò»oÁÔ(€hƒáÏwÿï?ýG %€fI’q^D$.TÊ³?ÇD *°AôÁ,ÀÁÜÁü`6„B$ÄÂBB d€r`)¬‚B(†Í°*`/Ô@4ÀQh†“p.ÂU¸=púažÁ(¼ AÈa!ÚˆbŠX#Ž™…ø!ÁH‹$ ÉˆQ"K‘5H1RŠT UHò=r9‡\Fº‘;È2‚ü†¼G1”²Q=ÔµC¹¨7„F¢Ðdt1š ›Ðr´=Œ6¡çÐ«hÚ>CÇ0Àè3Äl0.ÆÃB±8,  “cË±"¬«Æ°V¬»‰õcÏ±wEÀ    6wB aAHXLXNØH¨ $4Ú  7   „QÂ'"“¨K´&ºùÄb21‡XH,#Ö/{ˆCÄ7$‰C2'¹I±¤TÒÒFÒnR#é,©›4H#“ÉÚdk²9”, +È…ääÃä3ää!ò[ b@q¤øSâ(RÊjJåå4åe˜2AU£šRÝ¨¡T5ZB¡¶R¯Q‡¨4uš9ÍƒIK¥¢•Óhh÷i¯ètºÝ•N—ÐWÒËéGè—èôw †ƒÇˆg(›gw¯˜L¦Ó‹ÇT071ë˜ç™™oUX*¶*|‘Ê •J•&•*/T©ª¦ªÞªUóUËT©^S}®FU3Sã©   Ô–«UªPëSSg©;¨‡ªg¨oT?¤~Yý‰YÃLÃOC¤Q ±_ã¼Æ c³x,!k «†u5Ä&±ÍÙ|v*»˜ý»‹=ª©¡9C3J3W³Ró”f?ã˜qøœtN ç(§—ó~ŠÞï)â)¦4L¹1e\kª–—–X«H«Q«Gë½6®í§¦½E»YûAÇJ'\'GgÎçSÙSÝ§ §M=:õ®.ªk¥¡»Dw¿n§î˜ž¾^€žLo§Þy½çú}/ýTýmú§õGX³$ÛÎ<Å5qo</ÇÛñQC]Ã@C¥a•a—á„‘¹Ñ<£ÕFFŒiÆ\ã$ãmÆmÆ£&&!&KMêMîšRM¹¦)¦;L;LÇÍÌÍ¢ÍÖ™5›=1×2ç›ç›×›ß·`ZxZ,¶¨¶¸eI²äZ¦Yî¶¼n…Z9Y¥XUZ]³F%Ö»»§§¹N“N«žÖgÃ°ñ¶É¶©·°åØÛ®¶m¶}agbg·Å®Ãî“½“}º}ý= ‡Ù«Z~s´r:V:ÞšÎœî?}Åô–é/gXÏÏØ3ã¶Ë)ÄiS›ÓGgg¹sƒóˆ‹‰K‚Ë.—>.›ÆÝÈ½äJtõq]ázÒõ›³›Âí¨Û¯î6îiî‡ÜŸÌ4Ÿ)žY3sÐÃÈCàQåÑ?Ÿ•0kß¬~OCOgµç#/c/‘W×°·¥wª÷aï>ö>rŸã>ã<7Þ2ÞY_Ì7À·È·ËOÃož_…ßC#ÿdÿzÿÑ§€%g‰A[ûøz|!¿Ž?:Ûeö²ÙíAŒ ¹AA‚‚åÁ!hÈì!÷ç˜Î‘Îi…P~èÖÐaæa‹Ã~'…‡…W†?ŽpˆXÑ1—5wÑÜCsßDúD–DÞ›g1O9¯-J5*>ª.j<Ú7º4º?Æ.fYÌÕXXIlK9.*®6nl¾ßüíó‡ââã{˜/È]py¡ÎÂô…§©.,:–@LˆN8”ðA*¨Œ%òw%Ž yÂÂg"/Ñ6ÑˆØC\*NòH*Mz’ì‘¼5y$Å3¥,å¹„'©¼L LÝ›:žšv m2=:½1ƒ’‘qBª!M“¶gêgæfvË¬e…²þÅn‹·/•Ék³¬Y- ¶B¦èTZ(×*²geWf¿Í‰Ê9–«ž+ÍíÌ³ÊÛ7œïŸÿíÂá’¶¥†KW-Xæ½¬j9²‰Š®Û—Ø(Üxå‡oÊ¿™Ü”´©«Ä¹dÏfÒféæÞ-ž[–ª—æ—n ÙÚ´ ßV´íõöEÛ/—Í(Û»ƒ¶C¹£¿<¸¼e§ÉÎÍ;?T¤TôTúT6îÒÝµa×ønÑî{¼ö4ìÕÛ[¼÷ý>É¾ÛUUMÕfÕeûIû³÷?®‰ªéø–ûm]NmqíÇÒý#¶×¹ÔÕÒ=TRÖ+ëGÇ¾þïw- 6 UœÆâ#pDyäé÷  ß÷ :ÚvŒ{¬áÓvg/jBšòšF›Sšû[b[ºOÌ>ÑÖêÞzüGÛœ499â?rýéü§CÏdÏ&žþ¢þË®/~øÕë×ÎÑ˜Ñ¡—ò—“¿m|¥ýêÀë¯ÛÆÂÆ¾Éx31^ôVûíÁwÜwï£ßOä| (ÿhù±õSÐ§û“““ÿ˜óüc3-Û cHRMz%€ƒùÿ€éu0ê`:˜o’_ÅFìIDATxÚÁIoUàyËŒ§3žÅN°/Ávš BÛiQ¥J=ô€¢^*nHpAøHÜøœzABÀ$$$TRDQ$$C’62‰—8Nâ‰ñÄÛxÞìoæñ} qðûÁ^Ã%¤T]ÆXl5O¿ÿqÇ¸üo:J²ª)ÊÖÃ{Ÿ}úØš9öÌ~çÞ›èñö»\ˆ)atð²ùõ“Ÿ..NgF£B(§•ÆÑIä;•bŽã\Ô¥J)¿V)®ä–êõÃÑ³m‹±øÕB‡ÜÀ8ŸL®ž=¯Ó(,&–…çvE>ÇM’ÎIÏuü‚þÉ£íoßùcw÷×?ŸwÍQ»Ý1Œa±£1ÃÖtÑ†>ä(cqÓ·>úà=”’²²tÿöíF·óÍoÏ\×‰CŸ"Œ9  0f²`2ªZ-¬ü°³;š«ù…ÀÎ¦¶šÉ6»ƒ¬¦jXÂæpŒH‰Â5m]¿þBVÿíµùî[FKMK«Çýé|k£¦¨RL#<™â0E{£VãÓZVOï7FSëã÷·oÞ¸ùùW_Ôª¥‡÷ïò¼à{!øùÉ—–íÙsWH+¼ÏOÏªÅ%âÞÜ*è‹Š¾Ð1zâ¢¬æ5Ïá¤xàêºf†Oÿn•uZ)ëZ˜Ñ:³ÑÑÑêu>;íÞÜñÜñXÂù>ÙkîåúÝŒ9¾šM“±9JÙ Äñt"h®XÂ”Pry5kœÛÍ¾- T+}bõGãõJe.ºÔóFn¸ ‹›¯—=xwÉ^s6&6Ç(@xAí•l»×{ZßgIÐä¯“þÍ·6’„

但我不知道如何为图像文件执行此操作。我可以以某种方式将此数组写入文件并加载图像，但我的项目不允许我这样做。我必须在飞行中这样做。

Answer 1

如果你只想向用户展示图片，你只需要在响应中提供正确的内容标题：

if      (substr($string, 0, 4) == "\x89PNG")  header('Content-Type: image/png');
else if (substr($string, 0, 2) == "\xFF\xD8") header('Content-Type: image/jpeg');
else if (substr($string, 0, 4) == "GIF8")     header('Content-Type: image/gif');

echo $string;

图像实际上只是一个数据块（比如你所拥有的'字符串'）以及它是一个图像的指示（在HTTP中，它将是MIME头）。由于您已经拥有了blob，因此您需要的只是使浏览器将其解释为图像的标题。

Answer 2

尝试

$body = file_get_contents('php://input');

并参考PHP - get image from byte array

Answer 3

您的意思与此处显示的示例相同：http://us.php.net/manual/en/function.imagecreatefromstring.php

$data = 'iVBORw0KGgoAAAANSUhEUgAAABwAAAASCAMAAAB/2U7WAAAABl'
       . 'BMVEUAAAD///+l2Z/dAAAASUlEQVR4XqWQUQoAIAxC2/0vXZDr'
       . 'EX4IJTRkb7lobNUStXsB0jIXIAMSsQnWlsV+wULF4Avk9fLq2r'
       . '8a5HSE35Q3eO2XP1A1wQkZSgETvDtKdQAAAABJRU5ErkJggg==';
$data = base64_decode($data);

$im = imagecreatefromstring($data);
if ($im !== false) {
    header('Content-Type: image/png');
    imagepng($im);
    imagedestroy($im);
}
else {
    echo 'An error occurred.';
}

Answer 4

使用下面的代码，我们可以从字节数组代码创建图像。

$userId             = $userid;
    $encoded_image      = $imgurl;
    $upload_path        = $_SERVER["DOCUMENT_ROOT"]."/projectName/uploads/";
    $LoginUserDetails   = $this->getUserDetails($userId);
    if ($LoginUserDetails->profile_image != "") {
        $dbimgname      = $LoginUserDetails->profile_image;
        unlink($upload_path .$dbimgname);
        unlink($upload_path . 'thumb_img/' . $dbimgname);
    }
    $decoded_image = base64_decode($encoded_image);
    $imgname       = md5(uniqid()) . ".png";
    file_put_contents($upload_path . $imgname, $decoded_image);

    $thumbnail      = $upload_path . "thumb_img/" . $imgname; // Set the thumbnail name
    $actual         = $upload_path . $imgname; // Set the actual image name
    // Get new sizes

    $upload_image = $upload_path.$imgname;
    //  print_r($actual); print_r($thumbnail); print_r($upload_image); die;
    list($width, $height) = getimagesize($upload_image);
    $newwidth  = 196; // This can be a set value or a percentage of original size ($width)
    $newheight = 196; // This can be a set value or a percentage of original size ($height)
    // Load the images
    $thumb     = imagecreatetruecolor($newwidth, $newheight);
    $source    = imagecreatefrompng($upload_image);
    //print_r($upload_image); print_r($source); die;
    imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); // Resize the $thumb image.
    imagepng($thumb, $thumbnail, 100); // Save the new file to the location specified by $thumbnail

    return $imgname;

在PHP中将二进制字节数组转换为图像

4 个答案: