{"id":1114,"date":"2017-03-07T11:39:05","date_gmt":"2017-03-07T03:39:05","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=1114"},"modified":"2017-03-07T11:39:05","modified_gmt":"2017-03-07T03:39:05","slug":"base64%e7%bc%96%e8%a7%a3%e7%a0%81%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=1114","title":{"rendered":"Base64\u7f16\u89e3\u7801\u539f\u7406"},"content":{"rendered":"<p>\n\t\u6211\u5728\u9762\u8bd5\u8fc7\u7a0b\u4e2d\uff0c\u95ee\u8fc7\u5f88\u591a\u9ad8\u7ea7java\u5de5\u7a0b\u5e08\uff0c\u662f\u5426\u4e86\u89e3<a href=\"http:\/\/baike.baidu.com\/item\/base64\" name=\"Base64\" target=\"_blank\" title=\"Base64\">Base64<\/a>\uff1f\u90e8\u5206\u4eba\u56de\u7b54\u4e86\u89e3\uff0c\u90e8\u5206\u4eba\u76f4\u63a5\u56de\u7b54\u4e0d\u4e86\u89e3\u3002\u800c\u8bf4\u4e86\u89e3\u7684\u90a3\u90e8\u5206\u4eba\u5374\u56de\u7b54\u4e0d\u4e0a\u6765\u5b83\u7684\u539f\u7406\u3002\n<\/p>\n<h2>\n\tBase64 \u7684\u7531\u6765<br \/>\n<\/h2>\n<p>\n\tBase64\u662f\u7f51\u7edc\u4e0a\u6700\u5e38\u89c1\u7684\u7528\u4e8e\u4f20\u8f938Bit\u5b57\u8282\u4ee3\u7801\u7684\u7f16\u7801\u65b9\u5f0f\u4e4b\u4e00\uff0c\u5927\u5bb6\u53ef\u4ee5\u67e5\u770b<a href=\"https:\/\/www.rfc-editor.org\/info\/rfc2045\" name=\"rfc2045\" target=\"_blank\" title=\"rfc2045\">RFC2045<\/a>\uff5e<a href=\"http:\/\/www.faqs.org\/rfcs\/rfc2049.html\" name=\"rfc2049\" target=\"_blank\" title=\"rfc2049\">RFC2049<\/a>\uff0c\u4e0a\u9762\u6709MIME\u7684\u8be6\u7ec6\u89c4\u8303\u3002\u5b83\u662f\u4e00\u79cd\u57fa\u4e8e\u752864\u4e2a\u53ef\u6253\u5370\u5b57\u7b26\u6765\u8868\u793a\u4e8c\u8fdb\u5236\u6570\u636e\u7684\u8868\u793a\u65b9\u6cd5\u3002\u5b83\u901a\u5e38\u7528\u4f5c\u5b58\u50a8\u3001\u4f20\u8f93\u4e00\u4e9b\u4e8c\u8fdb\u5236\u6570\u636e\u7f16\u7801\u65b9\u6cd5\uff01\u4e5f\u662fMIME\uff08\u591a\u7528\u9014\u4e92\u8054\u7f51\u90ae\u4ef6\u6269\u5c55\uff0c\u4e3b\u8981\u7528\u4f5c\u7535\u5b50\u90ae\u4ef6\u6807\u51c6\uff09\u4e2d\u4e00\u79cd\u53ef\u6253\u5370\u5b57\u7b26\u8868\u793a\u4e8c\u8fdb\u5236\u6570\u636e\u7684\u5e38\u89c1\u7f16\u7801\u65b9\u6cd5\uff01\u5b83\u5176\u5b9e\u53ea\u662f\u5b9a\u4e49\u7528\u53ef\u6253\u5370\u5b57\u7b26\u4f20\u8f93\u5185\u5bb9\u4e00\u79cd\u65b9\u6cd5\uff0c\u5e76\u4e0d\u4f1a\u4ea7\u751f\u65b0\u7684\u5b57\u7b26\u96c6\uff01\n<\/p>\n<p>\n\t\u4f20\u7edf\u7684\u90ae\u4ef6\u53ea\u652f\u6301\u53ef\u89c1\u5b57\u7b26\u7684\u4f20\u9001\uff0c\u50cf<a href=\"http:\/\/baike.baidu.com\/item\/ASCII\" name=\"ASCII\" target=\"_blank\" title=\"ASCII\">ASCII<\/a>\u7801\u7684\u63a7\u5236\u5b57\u7b26\u5c31 \u4e0d\u80fd\u901a\u8fc7\u90ae\u4ef6\u4f20\u9001\u3002\u8fd9\u6837\u7528\u9014\u5c31\u53d7\u5230\u4e86\u5f88\u5927\u7684\u9650\u5236\uff0c\u6bd4\u5982\u56fe\u7247<a href=\"http:\/\/baike.baidu.com\/item\/\u4e8c\u8fdb\u5236\" target=\"_blank\">\u4e8c\u8fdb\u5236<\/a>\u6d41\u7684\u6bcf\u4e2a\u5b57\u8282\u4e0d\u53ef\u80fd\u5168\u90e8\u662f\u53ef\u89c1\u5b57\u7b26\uff0c\u6240\u4ee5\u5c31\u4f20\u9001\u4e0d\u4e86\u3002\u6700\u597d\u7684\u65b9\u6cd5\u5c31\u662f\u5728\u4e0d\u6539\u53d8\u4f20\u7edf\u534f\u8bae\u7684\u60c5 \u51b5\u4e0b\uff0c\u505a\u4e00\u79cd\u6269\u5c55\u65b9\u6848\u6765\u652f\u6301\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u4f20\u9001\u3002\u628a\u4e0d\u53ef\u6253\u5370\u7684\u5b57\u7b26\u4e5f\u80fd\u7528\u53ef\u6253\u5370\u5b57\u7b26\u6765\u8868\u793a\uff0c\u95ee\u9898\u5c31\u89e3\u51b3\u4e86\u3002Base64\u7f16\u7801\u5e94\u8fd0\u800c\u751f\uff0cBase64\u5c31\u662f\u4e00\u79cd \u57fa\u4e8e64\u4e2a\u53ef\u6253\u5370\u5b57\u7b26\u6765\u8868\u793a\u4e8c\u8fdb\u5236\u6570\u636e\u7684\u8868\u793a\u65b9\u6cd5\u3002\n<\/p>\n<h2>\n\t\u4ec0\u4e48\u662fBase64\uff1f<br \/>\n<\/h2>\n<p>\n\tBase64\u88ab\u5b9a\u4e49\u4e3a\uff1aBase64\u5185\u5bb9\u4f20\u9001\u7f16\u7801\u88ab\u8bbe\u8ba1\u7528\u6765\u628a\u4efb\u610f\u5e8f\u5217\u76848\u4f4d\u5b57\u8282\u63cf\u8ff0\u4e3a\u4e00\u79cd\u4e0d\u6613\u88ab\u4eba\u76f4\u63a5\u8bc6\u522b\u7684\u5f62\u5f0f\u3002\n<\/p>\n<p>\n\t\uff08The Base64 Content-Transfer-Encoding is designed to represent arbitrary sequences of octets in a form that need not be humanly readable.\uff09&nbsp;\n<\/p>\n<h2>\n\tBase64\u7f16\u7801\u7684\u539f\u7406<br \/>\n<\/h2>\n<p>\n\t\u5b83\u662f\u752864\u4e2a\u53ef\u6253\u5370\u5b57\u7b26\u8868\u793a\u4e8c\u8fdb\u5236\u6240\u6709\u6570\u636e\u65b9\u6cd5\u3002\u7531\u4e8e2\u76846\u6b21\u65b9\u7b49\u4e8e64\uff0c\u6240\u4ee5\u53ef\u4ee5\u7528\u6bcf6\u4e2a\u4f4d\u5143\u4e3a\u4e00\u4e2a\u5355\u5143\uff0c\u5bf9\u5e94\u67d0\u4e2a\u53ef\u6253\u5370\u5b57\u7b26\u3002\u6211\u4eec\u77e5\u9053\u4e09\u4e2a\u5b57\u8282\u670924\u4e2a\u4f4d\u5143\uff0c\u5c31\u53ef\u4ee5\u521a\u597d\u5bf9\u5e94\u4e8e4\u4e2aBase64\u5355\u5143\uff0c\u53733\u4e2a\u5b57\u8282\u9700\u8981\u75284\u4e2aBase64\u7684\u53ef\u6253\u5370\u5b57\u7b26\u6765\u8868\u793a\u3002\u5728Base64\u4e2d\u7684\u53ef\u6253\u5370\u5b57\u7b26\u5305\u62ec\u5b57\u6bcdA-Z\u3001a-z\u3001\u6570\u5b570-9 \uff0c\u8fd9\u6837\u5171\u670962\u4e2a\u5b57\u7b26\uff0c\u6b64\u5916\u4e24\u4e2a\u53ef\u6253\u5370\u7b26\u53f7\u5728\u4e0d\u540c\u7684\u7cfb\u7edf\u4e2d\u4e00\u822c\u6709\u6240\u4e0d\u540c\u3002\u4f46\u662f\uff0c\u6211\u4eec\u7ecf\u5e38\u6240\u8bf4\u7684Base64\u53e6\u59162\u4e2a\u5b57\u7b26\u662f\uff1a&ldquo;+\/&rdquo;\u3002\u8fd964\u4e2a\u5b57\u7b26\uff0c\u6240\u5bf9\u5e94\u8868\u5982\u4e0b\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"Base64 \u7f16\u7801 \u5bf9\u5e94\u8868\" src=\"http:\/\/img.bbs.csdn.net\/upload\/201703\/07\/1488857068_318781.png\" style=\"width: 632px;height: 430px\" \/>\n<\/p>\n<p>\n\t\u8f6c\u6362\u7684\u65f6\u5019\uff0c\u5c06\u4e09\u4e2a<a href=\"http:\/\/baike.baidu.com\/item\/\u5b57\u8282\" target=\"_blank\">byte<\/a>\u7684\u6570\u636e\uff0c\u5148\u540e\u653e\u5165\u4e00\u4e2a24bit\u7684\u7f13\u51b2\u533a\u4e2d\uff0c\u5148\u6765\u7684byte\u5360\u9ad8\u4f4d\u3002\u6570\u636e\u4e0d\u8db33byte\u7684\u8bdd\uff0c\u4e8e\u7f13\u51b2\u533a\u4e2d\u5269\u4e0b\u7684bit\u75280\u8865\u8db3\u3002\u7136\u540e\uff0c\u6bcf\u6b21\u53d6\u51fa6\u4e2abit\uff0c\u6309\u7167\u5176\u503c\u9009\u62e9<br \/>\n\tABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+\/\u4e2d\u7684\u5b57\u7b26\u4f5c\u4e3a\u7f16\u7801\u540e\u7684\u8f93\u51fa\u3002\u4e0d\u65ad\u8fdb\u884c\uff0c\u76f4\u5230\u5168\u90e8\u8f93\u5165\u6570\u636e\u8f6c\u6362\u5b8c\u6210\u3002<br \/>\n\t\u5982\u679c\u6700\u540e\u5269\u4e0b\u4e24\u4e2a\u8f93\u5165\u6570\u636e\uff0c\u5728\u7f16\u7801\u7ed3\u679c\u540e\u52a01\u4e2a&ldquo;=&rdquo;\uff1b\u5982\u679c\u6700\u540e\u5269\u4e0b\u4e00\u4e2a\u8f93\u5165\u6570\u636e\uff0c\u7f16\u7801\u7ed3\u679c\u540e\u52a02\u4e2a&ldquo;=&rdquo;\uff1b\u5982\u679c\u6ca1\u6709\u5269\u4e0b\u4efb\u4f55\u6570\u636e\uff0c\u5c31\u4ec0\u4e48\u90fd\u4e0d\u8981\u52a0\uff0c\u8fd9\u6837\u624d\u53ef\u4ee5\u4fdd\u8bc1\u8d44\u6599\u8fd8\u539f\u7684\u6b63\u786e\u6027\u3002\n<\/p>\n<h2>\n\tBase64\u7f16\u7801\u5b9e\u4f8b<br \/>\n<\/h2>\n<p>\n\t\u5728\u8fd9\u91cc\uff0c\u4e09\u4e2a\u5b57\u7b26\u7ec4\u6210\u7684\u8f93\u5165\u503c&ldquo;Ow!&rdquo;\u662fbase64\u7f16\u7801\u7684\uff0c\u5f97\u5230\u7684\u662f4\u4e2a\u5b57\u7b26\u7684base64\u7f16\u7801\u503c&ldquo;T3ch&rdquo;\u3002\u5b83\u662f\u6309\u4ee5\u4e0b\u65b9\u5f0f\u5de5\u4f5c\u7684\u3002\n<\/p>\n<ol>\n<li>\n\t\t\u5b57\u7b26\u4e32&quot;Ow!&quot;\u88ab\u62c6\u5206\u62103\u4e2a8\u4f4d\u7684\u5b57\u8282(0x4F\u30010x77\u30010x21)\u3002\n\t<\/li>\n<li>\n\t\t&nbsp;\u8fd93\u4e2a\u5b57\u8282\u6784\u6210\u4e86\u4e00\u4e2a24\u4e3a\u7684\u4e8c\u8fdb\u523601001111 01110111 00100001\u3002\n\t<\/li>\n<li>\n\t\t&nbsp;\u8fd9\u4e9b\u4e3a\u88ab\u5212\u5206\u4e3a\u4e00\u4e9b6\u4f4d\u7684\u5e8f\u5217010011\u3001110111\u3001011100\u30011000001.\n\t<\/li>\n<li>\n\t\t&nbsp;\u6bcf\u4e2a6\u4f4d\u503c\u90fd\u8868\u793a\u4e86\u4ece0\uff5e63\u4e4b\u95f4\u7684\u6570\u5b57\uff0c\u5bf9\u5e94base64\u5b57\u6bcd\u8868\u4e2d\u768464\u4e2a\u5b57\u7b26\u4e4b\u4e00\u3002\u5f97\u5230\u7684base64\u7f16\u7801\u5b57\u7b26\u4e32\u662f4\u4e2a\u5b57\u7b26\u7684\u5b57\u7b26\u4e32&ldquo;T3ch&rdquo;\u3002\u7136\u540e\u5c31\u53ef\u4ee5\u901a\u8fc7\u7ebf\u8def\u5c06\u8fd9\u4e2a\u5b57\u7b26\u4e32\u4f5c\u4e3a&ldquo;\u5b89\u5168\u7684&rdquo;8\u4f4d\u5b57\u7b26\u4f20\u9001\u51fa\u53bb\uff0c\u56e0\u4e3a\u53ea\u7528\u4e86\u4e00\u4e9b\u79fb\u690d\u6027\u6700\u597d\u7684\u5b57\u7b26(\u5b57\u6bcd\u3001\u6570\u5b57\u7b49)\u3002\n\t<\/li>\n<\/ol>\n<p>\n\t\u4ee5\u4e0b\u662f<a href=\"http:\/\/baike.baidu.com\/item\/javascript\" name=\"javascript\" target=\"_blank\" title=\"javascript\">JavaScript<\/a>\u5bf9Base64\u7684\u7f16\u7801\u5b9e\u73b0\u3002\n<\/p>\n<pre class=\"brush:jscript;\">\r\n\/\/ \u73b0\u5728\u5c06\u5b57\u7b26\u4e32&quot;Ow!&quot;\u8f6c\u6362\u4e3abase64\u7f16\u7801\u503c\r\nvar str = &#039;Ow!&#039;;\r\n\/\/ \u6216\u53bb\u5b57\u7b26\u4e32\u7684\u4e8c\u8fdb\u5236\u7801\r\nvar binary = [];\r\nfor (var i = 0; i &lt; str.length; i++) {\r\n    \/\/ \u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u8868\u793a\r\n    var binStr = str.charCodeAt(i).toString(2);\r\n    \/\/ \u5c06\u5f97\u5230\u7684\u4e8c\u8fdb\u5236\u653e\u5165\u6570\u7ec4\u4e2d\u5f97\u5230\r\n    \/\/ ['1001111','1110111','100001']\r\n    \/\/ \u56e0\u4e3a\u4e00\u4e2a\u6b63\u5e38\u7684\u4e8c\u8fdb\u5236\u5b57\u8282\u90fd\u662f\u75318bit\u7ec4\u6210\u7684,\u4e0d\u591f8bit\u7684\u8bdd\u4e0d\u8868\u793a.\u4e0a\u9762\u5f97\u5230\u7684\u90fd\u4e0d\u591f8bit\u6240\u4ee5\u524d\u9762\u6211\u4eec\u624b\u52a8\u7ed9\u88650,\u5c31\u5f97\u5230\u4e86\r\n    \/\/ ['01001111','01110111','00100001']\r\n    binary.push(binStr);\r\n}\r\n\/\/ 1 \u628a\u5b57\u7b26\u4e32\u6309\u71676\u4f4d\u5206\u5f00,\u8fdb\u884c\u5206\u5272,\u5f97\u5230['010011','110111','011100','1000001']\r\n\/\/ 2 \u5c06\u6bcf\u4e00\u4e2a\u8f6c\u6362\u4e3a\u5341\u8fdb\u5236\u5206\u522b\u5bf9\u4e8e[19,55,28,33];\r\n\/\/ 3 \u5c06\u6bcf\u4e00\u4f4d\u6570\u5b57\u5206\u522b\u5bf9\u4e8e\u4e0a\u9762\u63d0\u4f9b\u7684base64\u5bf9\u5e94\u8868,\u5f97\u5230\u5bf9\u5e94\u7684\u7f16\u7801,\u5206\u522b\u5bf9\u4e8e T 3 c h\r\n\/\/ 4 \u6700\u540e\u5c31\u4f1a\u5f97\u5230base64\u7f16\u7801T3ch\r\nconsole.log(&#039;\u5b57\u7b26&quot;Ow!&quot;\u6700\u540e\u5f97\u5230\u7684base64\u7f16\u7801\u4e3a&quot;T3ch&quot;&#039;);<\/pre>\n<h2>\n\tBase64\u7684\u539f\u7406<br \/>\n<\/h2>\n<p>\n\t\u4e0b\u9762\u6211\u518d\u901a\u8fc7\u4e00\u4e2a\u8f6c\u7801\u8fc7\u7a0b\u4f8b\u5b50\u6765\u8bf4\u660e\u5b83\u7684\u539f\u7406\u3002\n<\/p>\n<p>\n\t3*8=4*6<br \/>\n\t\u5185\u5b581\u4e2a\u5b57\u7b26\u53608\u4f4d<br \/>\n\t\u8f6c\u524d\uff1a s 1 3<br \/>\n\t\u5148\u8f6c\u6210ascii\uff1a\u5bf9\u5e94 115 49 51<br \/>\n\t2\u8fdb\u5236\uff1a 01110011 00110001 00110011<br \/>\n\t6\u4e2a\u4e00\u7ec4\uff084\u7ec4\uff09 011100110011000100110011<br \/>\n\t\u7136\u540e\u624d\u6709\u540e\u9762\u7684 011100 110011 000100 110011<br \/>\n\t\u7136\u540e\u8ba1\u7b97\u673a\u662f8\u4f4d8\u4f4d\u7684\u5b58\u6570 6\u4e0d\u591f\uff0c\u81ea\u52a8\u5c31\u8865\u4e24\u4e2a\u9ad8\u4f4d0\u4e86<br \/>\n\t\u6240\u6709\u6709\u4e86 \u9ad8\u4f4d\u88650<br \/>\n\t\u79d1\u5b66\u8ba1\u7b97\u5668\u8f93\u5165 00011100 00110011 00000100 00110011<br \/>\n\t\u5f97\u5230 28 51 4 51<br \/>\n\t\u67e5\u5bf9\u4e0b\u7167\u8868 c z E z\n<\/p>\n<h2>\n\tBase64\u7f16\u7801\u6280\u672f\u7684\u5e94\u7528<br \/>\n<\/h2>\n<ol>\n<li>\n\t\t\u4f20\u8f93\u6570\u636e\uff0c\u5c3d\u91cf\u505a\u5230\u6570\u636e\u53ef(<a href=\"http:\/\/baike.baidu.com\/item\/\u9632\u76d7\u94fe\" name=\"\u9632\u76d7\u94fe\" target=\"_blank\" 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