{"id":2275,"date":"2026-05-21T18:06:24","date_gmt":"2026-05-21T10:06:24","guid":{"rendered":"http:\/\/www.preluna.xyz\/?p=2275"},"modified":"2026-05-21T18:06:25","modified_gmt":"2026-05-21T10:06:25","slug":"ascii%e7%a0%81%e4%b8%8e%e5%ad%97%e8%8a%82","status":"publish","type":"post","link":"http:\/\/www.preluna.xyz\/index.php\/2026\/05\/21\/ascii%e7%a0%81%e4%b8%8e%e5%ad%97%e8%8a%82\/preluna\/text\/","title":{"rendered":"ascii\u7801\u4e0e\u5b57\u8282"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">SMTP\u53ea\u652f\u6301\u4f20\u9001\u4e03\u6bd4\u7279\u7684ascii\u7801\u5185\u5bb9\uff0c\u662f\u4e0d\u662f\u8bf4\u8fd9\u4e2a\u7535\u5b50\u90ae\u4ef6\u5b83\u6240\u4f20\u9001\u7684\u91cf\u5f88\u5c11\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u662f\u3002<strong>\u201cSMTP \u53ea\u652f\u6301\u4f20\u9001 7 \u6bd4\u7279 ASCII \u7801\u5185\u5bb9\u201d\u4e0d\u662f\u8bf4\u4e00\u5c01\u90ae\u4ef6\u53ea\u80fd\u4f20\u5f88\u5c11\u7684\u6570\u636e\uff0c\u4e5f\u4e0d\u662f\u8bf4\u90ae\u4ef6\u603b\u5927\u5c0f\u4e0d\u80fd\u8d85\u8fc7 7 bit\u3002\u5b83\u8bf4\u7684\u662f\uff1aSMTP \u65e9\u671f\u89c4\u5b9a\u90ae\u4ef6\u6b63\u6587\u5728\u4f20\u8f93\u65f6\u5fc5\u987b\u662f\u201c7 bit clean\u201d\u7684\u6587\u672c\u6570\u636e\uff0c\u4e5f\u5c31\u662f\u6bcf\u4e2a\u5b57\u7b26\u53ea\u80fd\u4f7f\u7528 7 \u4f4d ASCII \u5b57\u7b26\u96c6\u4e2d\u7684\u5b57\u7b26\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6362\u53e5\u8bdd\u8bf4\uff0c\u8fd9\u91cc\u9650\u5236\u7684\u662f<strong>\u5b57\u7b26\u7f16\u7801\u8303\u56f4<\/strong>\uff0c\u4e0d\u662f\u76f4\u63a5\u9650\u5236\u90ae\u4ef6\u603b\u5bb9\u91cf\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u30017 \u6bd4\u7279 ASCII \u5230\u5e95\u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ASCII \u7801\u672c\u8eab\u662f 7 \u4f4d\u7f16\u7801\uff0c\u53ef\u4ee5\u8868\u793a 128 \u4e2a\u5b57\u7b26\uff0c\u8303\u56f4\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>0000000 ~ 1111111\n\u4e5f\u5c31\u662f\u5341\u8fdb\u5236 0 ~ 127\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e9b\u5b57\u7b26\u5305\u62ec\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u82f1\u6587\u5b57\u6bcd A-Z\u3001a-z\n\u6570\u5b57 0-9\n\u5e38\u89c1\u6807\u70b9\u7b26\u53f7\n\u7a7a\u683c\n\u56de\u8f66\u6362\u884c\n\u4e00\u4e9b\u63a7\u5236\u5b57\u7b26\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5 SMTP \u65e9\u671f\u80fd\u76f4\u63a5\u4f20\u7684\u5185\u5bb9\uff0c\u5927\u81f4\u5c31\u662f\u8fd9\u79cd\u5f62\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Hello, this is a test email.\nMy name is Tom.\n123456.\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e9b\u90fd\u5c5e\u4e8e 7 \u4f4d ASCII \u8303\u56f4\u5185\u7684\u5b57\u7b26\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u662f\u4e0b\u9762\u8fd9\u4e9b\u5185\u5bb9\u5c31\u4e0d\u662f\u5355\u7eaf 7 \u4f4d ASCII\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4e2d\u6587\uff1a\u4f60\u597d\n\u65e5\u6587\uff1a\u3053\u3093\u306b\u3061\u306f\n\u8868\u60c5\uff1a\ud83d\ude0a\n\u56fe\u7247\u3001\u97f3\u9891\u3001PDF\u3001Word \u6587\u4ef6\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\u5b83\u4eec\u4e0d\u80fd\u76f4\u63a5\u7528 7 \u4f4d ASCII \u8868\u793a\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u8fd9\u4e0d\u662f\u8bf4\u90ae\u4ef6\u5185\u5bb9\u5f88\u5c11<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u6700\u5bb9\u6613\u8bef\u89e3\u7684\u662f\uff1a<strong>7 bit \u4e0d\u662f\u6307\u6574\u5c01\u90ae\u4ef6\u53ea\u6709 7 bit\uff0c\u800c\u662f\u6307\u6bcf\u4e2a\u4f20\u8f93\u5b57\u7b26\u5fc5\u987b\u5c5e\u4e8e 7 \u4f4d ASCII \u5b57\u7b26\u8303\u56f4\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\u4e00\u5c01\u7eaf\u82f1\u6587\u90ae\u4ef6\u53ef\u4ee5\u5f88\u957f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>This is line 1.\nThis is line 2.\nThis is line 3.\n...\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ea\u8981\u6bcf\u4e2a\u5b57\u7b26\u90fd\u662f ASCII \u5b57\u7b26\uff0c\u5b83\u4ecd\u7136\u7b26\u5408 SMTP \u539f\u59cb\u8981\u6c42\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SMTP \u53ea\u652f\u6301 7 \u6bd4\u7279 ASCII\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u771f\u6b63\u542b\u4e49\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SMTP \u539f\u59cb\u534f\u8bae\u4f20\u8f93\u7684\u662f\u7531 7 \u4f4d ASCII \u5b57\u7b26\u7ec4\u6210\u7684\u6587\u672c\u6d41\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4e00\u5c01\u90ae\u4ef6\u53ea\u80fd\u4f20 7 bit\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u7406\u89e3\u4e00\u5b9a\u8981\u7ea0\u6b63\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u5982\u679c\u90ae\u4ef6\u5185\u5bb9\u5f88\u5927\uff0c\u4f1a\u600e\u4e48\u6837\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u90ae\u4ef6\u5185\u5bb9\u5f88\u5927\uff0c\u4f46\u5168\u90e8\u662f ASCII \u6587\u672c\uff0c\u6bd4\u5982\u82f1\u6587\u957f\u6587\uff0c\u90a3\u4e48\u4ece\u201c7 \u4f4d ASCII\u201d\u8fd9\u4e2a\u89d2\u5ea6\u770b\uff0c\u5b83\u4ecd\u7136\u53ef\u4ee5\u4f20\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u662f\u5b9e\u9645\u90ae\u4ef6\u7cfb\u7edf\u8fd8\u4f1a\u53d7\u5230\u5176\u4ed6\u9650\u5236\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u90ae\u4ef6\u670d\u52a1\u5668\u5141\u8bb8\u7684\u6700\u5927\u90ae\u4ef6\u5927\u5c0f\n\u6536\u4ef6\u670d\u52a1\u5668\u5141\u8bb8\u7684\u6700\u5927\u90ae\u4ef6\u5927\u5c0f\n\u5355\u884c\u957f\u5ea6\u9650\u5236\n\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u7684\u7f13\u5b58\u548c\u5b58\u50a8\u9650\u5236\n\u9644\u4ef6\u5927\u5c0f\u9650\u5236\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e5f\u5c31\u662f\u8bf4\uff0c<strong>\u5927\u90ae\u4ef6\u7684\u95ee\u9898\u4e0d\u662f\u56e0\u4e3a\u201c7 bit ASCII\u201d\u672c\u8eab\uff0c\u800c\u662f\u56e0\u4e3a\u90ae\u4ef6\u670d\u52a1\u5668\u548c\u4f20\u8f93\u7cfb\u7edf\u4f1a\u9650\u5236\u90ae\u4ef6\u5927\u5c0f\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8ba1\u7b97\u673a\u7f51\u7edc\u8003\u7814\u8bed\u5883\u91cc\uff0c\u901a\u5e38\u4e0d\u9700\u8981\u5c55\u5f00\u5177\u4f53\u670d\u52a1\u5668\u9650\u5236\uff0c\u53ea\u8981\u77e5\u9053\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SMTP \u539f\u59cb\u534f\u8bae\u4f20\u8f93 ASCII \u6587\u672c\uff1b\n\u90ae\u4ef6\u8fc7\u5927\u65f6\u53ef\u80fd\u53d7\u5230\u670d\u52a1\u5668\u6700\u5927\u90ae\u4ef6\u5927\u5c0f\u7b49\u9650\u5236\uff1b\n\u4f46\u8fd9\u548c\u201c7 bit ASCII\u201d\u4e0d\u662f\u540c\u4e00\u4e2a\u9650\u5236\u3002\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u5982\u679c\u90ae\u4ef6\u5185\u5bb9\u4e0d\u662f 7 \u4f4d ASCII\uff0c\u4f1a\u600e\u4e48\u6837\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u90ae\u4ef6\u4e2d\u51fa\u73b0\u4e2d\u6587\u3001\u56fe\u7247\u3001\u9644\u4ef6\u7b49\u5185\u5bb9\uff0c\u539f\u59cb SMTP \u4e0d\u80fd\u76f4\u63a5\u4f20\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\u4e2d\u6587\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4f60\u597d\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b83\u4e0d\u662f 7 \u4f4d ASCII \u5b57\u7b26\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56fe\u7247\u3001PDF\u3001\u538b\u7f29\u5305\u8fd9\u4e9b\u66f4\u4e0d\u662f\u6587\u672c\u5b57\u7b26\uff0c\u5b83\u4eec\u662f\u4e8c\u8fdb\u5236\u6570\u636e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u65f6\u5c31\u9700\u8981\u7528 <strong>MIME<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MIME \u7684\u4f5c\u7528\u53ef\u4ee5\u7406\u89e3\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u628a\u975e ASCII \u5185\u5bb9\u6216\u4e8c\u8fdb\u5236\u5185\u5bb9\uff0c\u8f6c\u6362\u6210 SMTP \u80fd\u4f20\u8f93\u7684 ASCII \u6587\u672c\u5f62\u5f0f\u3002\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e38\u89c1\u65b9\u5f0f\u6709\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Base64 \u7f16\u7801\nQuoted-Printable \u7f16\u7801\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\u9644\u4ef6\u672c\u6765\u662f\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u7ecf\u8fc7 Base64 \u7f16\u7801\u540e\uff0c\u4f1a\u53d8\u6210\u7c7b\u4f3c\u8fd9\u6837\u7684 ASCII \u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>JVBERi0xLjQKJcfs...\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e9b\u5b57\u7b26\u672c\u8eab\u53ea\u5305\u542b\u82f1\u6587\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u52a0\u53f7\u3001\u659c\u6760\u3001\u7b49\u53f7\u7b49 ASCII \u5b57\u7b26\uff0c\u6240\u4ee5\u53ef\u4ee5\u901a\u8fc7 SMTP \u4f20\u8f93\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u6536\u65b9\u6536\u5230\u540e\uff0c\u518d\u6839\u636e MIME \u8bf4\u660e\u628a\u8fd9\u4e9b ASCII \u6587\u672c\u8fd8\u539f\u6210\u539f\u6765\u7684\u6587\u4ef6\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u201c\u4e0d\u8db3\u4e03\u4f4d ASCII \u6587\u672c\u90ae\u4ef6\u201d\u8fd9\u4e2a\u8bf4\u6cd5\u8be5\u600e\u4e48\u7406\u89e3\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u8bf4\u7684\u662f\u201c\u67d0\u4e2a\u5b57\u7b26\u4e0d\u8db3 7 \u4f4d\u201d\uff0c\u8fd9\u4e2a\u8bf4\u6cd5\u4e0d\u592a\u51c6\u786e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ASCII \u5b57\u7b26\u7f16\u7801\u672c\u8eab\u6309 7 \u4f4d\u7406\u89e3\uff0c\u4f46\u5b9e\u9645\u5728\u8ba1\u7b97\u673a\u4e2d\u901a\u5e38\u4ee5 8 \u4f4d\u5b57\u8282\u5b58\u50a8\u548c\u4f20\u8f93\uff0c\u53ea\u662f\u6700\u9ad8\u4f4d\u4e0d\u7528\uff0c\u6216\u8005\u8bf4\u6700\u9ad8\u4f4d\u4e3a 0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\u5b57\u7b26 <code>A<\/code>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ASCII \u5341\u8fdb\u5236\uff1a65\n7 \u4f4d\u4e8c\u8fdb\u5236\uff1a1000001\n8 \u4f4d\u5b58\u50a8\u5f62\u5f0f\uff1a01000001\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u5e76\u4e0d\u662f\u6bcf\u4e2a\u5b57\u7b26\u90fd\u5fc5\u987b\u201c\u521a\u597d\u5199\u6ee1 7 \u4f4d\u201d\u3002ASCII \u7f16\u7801\u672c\u8eab\u5c31\u662f\u4e00\u79cd\u56fa\u5b9a\u8303\u56f4\u7684\u7f16\u7801\uff0c\u5b57\u7b26\u503c\u53ea\u8981\u5728 0 \u5230 127 \u5185\uff0c\u5c31\u5c5e\u4e8e 7 \u4f4d ASCII\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e00\u5c01\u90ae\u4ef6\u5185\u5bb9\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>A\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u90a3\u5f53\u7136\u53ef\u4ee5\u4f20\u3002\u5b83\u4e0d\u4f1a\u56e0\u4e3a\u5185\u5bb9\u201c\u592a\u5c11\u201d\u800c\u51fa\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e00\u5c01\u90ae\u4ef6\u53ea\u6709\u51e0\u4e2a\u82f1\u6587\u5b57\u6bcd\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Hi\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e5f\u662f\u5408\u6cd5\u7684 ASCII \u6587\u672c\u90ae\u4ef6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u90ae\u4ef6\u5185\u5bb9\u5c11\uff0c\u4e0d\u4f1a\u6709\u95ee\u9898\uff1b\n\u90ae\u4ef6\u5b57\u7b26\u5c5e\u4e8e ASCII \u8303\u56f4\uff0c\u4e5f\u4e0d\u4f1a\u6709\u95ee\u9898\uff1b\nSMTP \u5173\u5fc3\u7684\u662f\u5b57\u7b26\u662f\u5426\u8d85\u51fa 7 \u4f4d ASCII \u8303\u56f4\uff0c\u800c\u4e0d\u662f\u5185\u5bb9\u6709\u6ca1\u6709\u201c\u51d1\u591f 7 \u4f4d\u201d\u3002\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u8003\u7814\u4e2d\u5e94\u8be5\u600e\u4e48\u8bb0\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 408 \u8ba1\u7b97\u673a\u7f51\u7edc\u91cc\uff0c\u8fd9\u4e2a\u70b9\u901a\u5e38\u548c <strong>SMTP\u3001MIME\u3001\u7535\u5b50\u90ae\u4ef6\u7cfb\u7edf\u7ed3\u6784<\/strong>\u4e00\u8d77\u8003\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u8fd9\u6837\u8bb0\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SMTP\uff1a\u8d1f\u8d23\u53d1\u9001\u90ae\u4ef6\uff0c\u539f\u59cb\u534f\u8bae\u53ea\u80fd\u4f20 7 \u4f4d ASCII \u6587\u672c\u3002\nMIME\uff1a\u6269\u5c55\u90ae\u4ef6\u5185\u5bb9\u7c7b\u578b\uff0c\u4f7f\u90ae\u4ef6\u53ef\u4ee5\u643a\u5e26\u4e2d\u6587\u3001\u56fe\u7247\u3001\u97f3\u9891\u3001\u89c6\u9891\u3001\u9644\u4ef6\u7b49\u975e ASCII \u5185\u5bb9\u3002\nPOP3\/IMAP\uff1a\u8d1f\u8d23\u4ece\u90ae\u4ef6\u670d\u52a1\u5668\u8bfb\u53d6\u90ae\u4ef6\u3002\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u66f4\u9002\u5408\u505a\u9898\u7684\u8868\u8fbe\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SMTP \u672c\u8eab\u53ea\u80fd\u4f20\u9001 7 \u4f4d ASCII \u7801\u6587\u672c\uff0c\u4e0d\u80fd\u76f4\u63a5\u4f20\u8f93\u4e8c\u8fdb\u5236\u6587\u4ef6\u6216\u975e ASCII \u5b57\u7b26\u3002\u82e5\u8981\u4f20\u8f93\u4e2d\u6587\u3001\u56fe\u7247\u3001\u58f0\u97f3\u3001\u89c6\u9891\u3001\u9644\u4ef6\u7b49\u5185\u5bb9\uff0c\u9700\u8981\u501f\u52a9 MIME \u5bf9\u5185\u5bb9\u8fdb\u884c\u7f16\u7801\u548c\u7c7b\u578b\u8bf4\u660e\u3002\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9898\u76ee\u91cc\u5982\u679c\u95ee\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SMTP \u4e3a\u4ec0\u4e48\u9700\u8981 MIME\uff1f\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b54\u6848\u5c31\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u56e0\u4e3a SMTP \u539f\u59cb\u8bbe\u8ba1\u53ea\u80fd\u4f20\u8f93 7 \u4f4d ASCII \u6587\u672c\uff0c\u800c\u5b9e\u9645\u90ae\u4ef6\u5e38\u5e38\u5305\u542b\u975e ASCII \u5b57\u7b26\u548c\u4e8c\u8fdb\u5236\u9644\u4ef6\uff0c\u6240\u4ee5\u9700\u8981 MIME \u6269\u5c55\u3002\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u4e00\u4e2a\u5b8c\u6574\u4f8b\u5b50<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u53d1\u9001\u4e00\u5c01\u82f1\u6587\u90ae\u4ef6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Subject: Hello\n\nThis is a test email.\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u57fa\u672c\u90fd\u662f ASCII \u5b57\u7b26\uff0cSMTP \u53ef\u4ee5\u76f4\u63a5\u4f20\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u53d1\u9001\u4e00\u5c01\u4e2d\u6587\u90ae\u4ef6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Subject: \u4f60\u597d\n\n\u8fd9\u662f\u4e00\u5c01\u6d4b\u8bd5\u90ae\u4ef6\u3002\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e2d\u6587\u4e0d\u80fd\u76f4\u63a5\u7528 7 \u4f4d ASCII \u8868\u793a\uff0c\u6240\u4ee5\u9700\u8981 MIME \u7f16\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u53d1\u9001\u4e00\u5c01\u5e26 PDF \u9644\u4ef6\u7684\u90ae\u4ef6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6b63\u6587\uff1a\u8bf7\u67e5\u6536\u9644\u4ef6\u3002\n\u9644\u4ef6\uff1areport.pdf\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">PDF \u662f\u4e8c\u8fdb\u5236\u6587\u4ef6\uff0c\u4e5f\u4e0d\u80fd\u76f4\u63a5\u7528\u539f\u59cb SMTP \u4f20\u3002\u90ae\u4ef6\u7cfb\u7edf\u4f1a\u7528 MIME \u628a\u9644\u4ef6\u7f16\u7801\u6210 ASCII \u6587\u672c\uff0c\u518d\u901a\u8fc7 SMTP \u53d1\u9001\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u6838\u5fc3\u7684\u4e00\u53e5\u8bdd\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SMTP \u7684\u201c\u53ea\u652f\u6301 7 \u4f4d ASCII\u201d\u9650\u5236\u7684\u662f\u90ae\u4ef6\u4f20\u8f93\u5185\u5bb9\u7684\u5b57\u7b26\u8868\u793a\u8303\u56f4\uff0c\u4e0d\u662f\u9650\u5236\u90ae\u4ef6\u603b\u5927\u5c0f\uff1b\u5927\u90ae\u4ef6\u53d7\u670d\u52a1\u5668\u5927\u5c0f\u9650\u5236\uff0c\u975e ASCII \u6216\u4e8c\u8fdb\u5236\u5185\u5bb9\u9700\u8981 MIME \u7f16\u7801\u540e\u518d\u901a\u8fc7 SMTP \u4f20\u8f93\u3002\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">ascii\u7801\u4e0e\u5b57\u8282\u7684\u5173\u7cfb<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u662f\u4e0d\u662f\u8bf4\u4e00\u4e2aascii\u7801\u5b83\u6709\u4e03\u4f4dbit,\u6c49\u5b57\u6216\u8005\u4e00\u4e9b\u5176\u4ed6\u5b57\u6bcd\u53ef\u80fd\u8981\u7528\u4e24\u4e2aascii\u7801\u6765\u8868\u793a,\u8fd8\u662f\u8bf4ascii\u7801\u957f\u5ea6\u672c\u8eab\u4e0d\u56fa\u5b9a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u8fd9\u6837\u7406\u89e3\uff1a<strong>ASCII \u7801\u662f\u4e00\u79cd\u201c\u5b57\u7b26\u7f16\u7801\u89c4\u5219\u201d\uff0c\u5b57\u8282\u662f\u8ba1\u7b97\u673a\u5b58\u50a8\u548c\u4f20\u8f93\u6570\u636e\u65f6\u5e38\u7528\u7684\u201c\u6570\u636e\u5355\u4f4d\u201d\u3002\u4e8c\u8005\u4e0d\u662f\u540c\u4e00\u5c42\u9762\u7684\u4e1c\u897f\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u5bb9\u6613\u51fa\u9519\u7684\u5730\u65b9\u662f\u628a\u201c\u5b57\u7b26\u201d\u201c\u7f16\u7801\u503c\u201d\u201cbit \u4f4d\u6570\u201d\u201c\u5b57\u8282\u6570\u201d\u6df7\u5728\u4e00\u8d77\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001ASCII \u7801\u548c\u5b57\u8282\u4e0d\u662f\u4e00\u4e2a\u6982\u5ff5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>bit<\/strong> \u662f\u6700\u5c0f\u4fe1\u606f\u5355\u4f4d\uff0c\u53ea\u80fd\u8868\u793a 0 \u6216 1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>byte<\/strong> \u662f\u5b57\u8282\uff0c\u901a\u5e38\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 byte = 8 bit\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>ASCII \u7801<\/strong>\u662f\u5b57\u7b26\u7f16\u7801\u8868\uff0c\u5b83\u89c4\u5b9a\u67d0\u4e2a\u5b57\u7b26\u5bf9\u5e94\u54ea\u4e2a\u6570\u5b57\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5b57\u7b26 A  \u2192 ASCII \u5341\u8fdb\u5236 65\n\u5b57\u7b26 a  \u2192 ASCII \u5341\u8fdb\u5236 97\n\u5b57\u7b26 0  \u2192 ASCII \u5341\u8fdb\u5236 48\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e9b\u6570\u5b57\u518d\u7528\u4e8c\u8fdb\u5236\u8868\u793a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982 <code>A<\/code> \u7684 ASCII \u7801\u662f 65\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5341\u8fdb\u5236\uff1a65\n\u4e8c\u8fdb\u5236\uff1a1000001\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u4e8c\u8fdb\u5236\u521a\u597d\u9700\u8981 7 \u4f4d\uff0c\u6240\u4ee5\u8bf4 ASCII \u662f <strong>7 \u4f4d\u7f16\u7801<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u662f\u5728\u8ba1\u7b97\u673a\u91cc\uff0c\u6570\u636e\u901a\u5e38\u6309\u5b57\u8282\u5b58\u50a8\uff0c\u6240\u4ee5 <code>A<\/code> \u901a\u5e38\u4f1a\u5b58\u6210 1 \u4e2a\u5b57\u8282\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>A \u7684 ASCII \u7801\uff1a1000001\n\u5b9e\u9645\u6309 1 \u5b57\u8282\u5b58\u50a8\uff1a01000001\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u524d\u9762\u8865\u4e86\u4e00\u4e2a 0\uff0c\u53d8\u6210 8 bit\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u66f4\u51c6\u786e\u5730\u8bf4\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6807\u51c6 ASCII \u7801\u672c\u8eab\u662f 7 \u4f4d\u7f16\u7801\uff1b\n\u4f46\u5728\u8ba1\u7b97\u673a\u4e2d\u901a\u5e38\u7528 1 \u4e2a\u5b57\u8282\u6765\u5b58\u50a8\u4e00\u4e2a ASCII \u5b57\u7b26\u3002\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001ASCII \u7801\u957f\u5ea6\u672c\u8eab\u56fa\u5b9a\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6807\u51c6 ASCII \u662f\u56fa\u5b9a\u957f\u5ea6\u7f16\u7801\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a 7 bit \u8868\u793a\u4e00\u4e2a\u5b57\u7b26\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b83\u4e0d\u662f\u53d8\u957f\u7f16\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6807\u51c6 ASCII \u80fd\u8868\u793a 128 \u4e2a\u5b57\u7b26\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2\u2077 = 128\n\u8303\u56f4\uff1a0 ~ 127\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5305\u62ec\u82f1\u6587\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u5e38\u89c1\u7b26\u53f7\u3001\u63a7\u5236\u5b57\u7b26\u7b49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6bd4\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>A\uff1a65\nB\uff1a66\na\uff1a97\n0\uff1a48\n\u7a7a\u683c\uff1a32\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e9b\u5b57\u7b26\u90fd\u5728 0 \u5230 127 \u4e4b\u95f4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u662f\u5b9e\u9645\u5b58\u50a8\u65f6\uff0c\u901a\u5e38\u4e00\u4e2a ASCII \u5b57\u7b26\u5360 1 byte\uff0c\u4e5f\u5c31\u662f 8 bit\u3002\u6700\u9ad8\u4f4d\u901a\u5e38\u4e3a 0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ASCII \u7f16\u7801\u5c42\u9762\uff1a7 bit\n\u5b9e\u9645\u5b57\u8282\u5b58\u50a8\u5c42\u9762\uff1a\u901a\u5e38 1 byte\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e24\u4e2a\u8bf4\u6cd5\u5e76\u4e0d\u77db\u76fe\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u6c49\u5b57\u662f\u4e0d\u662f\u7528\u4e24\u4e2a ASCII \u7801\u8868\u793a\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u662f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6c49\u5b57\u4e0d\u662f\u7528\u4e24\u4e2a ASCII \u7801\u8868\u793a\u7684\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ASCII \u7801\u8868\u91cc\u6839\u672c\u6ca1\u6709\u6c49\u5b57\u3002ASCII \u53ea\u80fd\u8868\u793a\u82f1\u6587\u5b57\u7b26\u3001\u6570\u5b57\u3001\u7b26\u53f7\u548c\u63a7\u5236\u5b57\u7b26\uff0c\u4e0d\u80fd\u8868\u793a\u4e2d\u6587\u3001\u65e5\u6587\u3001\u97e9\u6587\u3001emoji \u7b49\u5185\u5bb9\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6c49\u5b57\u8981\u7528\u5176\u4ed6\u5b57\u7b26\u7f16\u7801\u6765\u8868\u793a\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>GB2312\nGBK\nUTF-8\nUTF-16\nUnicode\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u8981\u533a\u5206\u4e24\u4e2a\u6982\u5ff5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Unicode\uff1a\u7ed9\u5168\u4e16\u754c\u5b57\u7b26\u7edf\u4e00\u7f16\u53f7\nUTF-8 \/ UTF-16 \/ GBK\uff1a\u628a\u5b57\u7b26\u7f16\u53f7\u5b9e\u9645\u7f16\u7801\u6210\u5b57\u8282\u5e8f\u5217\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\u6c49\u5b57 <code>\u4e2d<\/code>\uff0c\u5728\u4e0d\u540c\u7f16\u7801\u65b9\u5f0f\u4e0b\u5360\u7528\u7684\u5b57\u8282\u6570\u53ef\u80fd\u4e0d\u540c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 UTF-8 \u4e2d\uff0c\u6c49\u5b57\u901a\u5e38\u5360 3 \u4e2a\u5b57\u8282\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4e2d \u2192 UTF-8 \u7f16\u7801\uff1aE4 B8 AD\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u662f 3 \u4e2a\u5b57\u8282\uff0c\u4e0d\u662f 3 \u4e2a ASCII \u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 GBK \u4e2d\uff0c\u5f88\u591a\u6c49\u5b57\u5360 2 \u4e2a\u5b57\u8282\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4e2d \u2192 GBK \u7f16\u7801\u901a\u5e38\u5360 2 \u4e2a\u5b57\u8282\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u4e0d\u80fd\u8bf4\u201c\u6c49\u5b57\u7528\u4e24\u4e2a ASCII \u7801\u8868\u793a\u201d\u3002\u66f4\u51c6\u786e\u7684\u8bf4\u6cd5\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6c49\u5b57\u4e0d\u80fd\u7528\u6807\u51c6 ASCII \u76f4\u63a5\u8868\u793a\uff1b\n\u6c49\u5b57\u9700\u8981\u7528 GBK\u3001UTF-8 \u7b49\u7f16\u7801\u65b9\u5f0f\u8868\u793a\uff1b\n\u5728\u4e0d\u540c\u7f16\u7801\u4e2d\uff0c\u4e00\u4e2a\u6c49\u5b57\u53ef\u80fd\u5360 2 \u4e2a\u5b57\u8282\u30013 \u4e2a\u5b57\u8282\u6216\u66f4\u591a\u5b57\u8282\u3002\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u90a3\u4e3a\u4ec0\u4e48\u6709\u65f6\u5019\u770b\u8d77\u6765\u50cf\u201c\u7528\u591a\u4e2a ASCII \u5b57\u7b26\u8868\u793a\u4e00\u4e2a\u6c49\u5b57\u201d\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f\u53e6\u4e00\u4e2a\u5c42\u6b21\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e00\u4e2a\u7cfb\u7edf\u53ea\u80fd\u4f20 7 \u4f4d ASCII\uff0c\u4f8b\u5982\u65e9\u671f SMTP\uff0c\u90a3\u4e48\u4e2d\u6587\u3001\u56fe\u7247\u3001\u9644\u4ef6\u8fd9\u4e9b\u975e ASCII \u5185\u5bb9\u4e0d\u80fd\u76f4\u63a5\u4f20\u3002\u6b64\u65f6\u53ef\u4ee5\u5148\u628a\u539f\u59cb\u5b57\u8282\u8fdb\u884c\u7f16\u7801\uff0c\u6bd4\u5982 Base64 \u7f16\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u4e00\u6bb5\u4e2d\u6587\u539f\u672c\u662f UTF-8 \u5b57\u8282\u5e8f\u5217\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4f60\u597d \u2192 E4 BD A0 E5 A5 BD\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e0d\u662f ASCII\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ecf\u8fc7 Base64 \u7f16\u7801\u540e\uff0c\u53ef\u80fd\u53d8\u6210\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>5L2g5aW9\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e9b\u5b57\u7b26 <code>5<\/code>\u3001<code>L<\/code>\u3001<code>2<\/code>\u3001<code>g<\/code>\u3001<code>5<\/code>\u3001<code>a<\/code>\u3001<code>W<\/code>\u3001<code>9<\/code> \u90fd\u662f ASCII \u5b57\u7b26\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u5728 SMTP\/MIME \u91cc\uff0c\u4f1a\u51fa\u73b0\u8fd9\u79cd\u73b0\u8c61\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u539f\u59cb\u5185\u5bb9\uff1a\u4e2d\u6587\u6216\u4e8c\u8fdb\u5236\u6570\u636e\n\u5148\u6309 UTF-8 \u7b49\u65b9\u5f0f\u53d8\u6210\u5b57\u8282\n\u518d\u7528 Base64 \u7b49\u65b9\u5f0f\u53d8\u6210 ASCII \u5b57\u7b26\u4e32\n\u901a\u8fc7 SMTP \u4f20\u8f93\n\u63a5\u6536\u65b9\u518d\u89e3\u7801\u8fd8\u539f\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u8fd9\u4ecd\u7136\u4e0d\u662f\u201c\u6c49\u5b57\u672c\u8eab\u7531\u51e0\u4e2a ASCII \u7801\u7ec4\u6210\u201d\u3002\u5b83\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4e3a\u4e86\u9002\u914d\u53ea\u80fd\u4f20 ASCII \u7684\u901a\u9053\uff0c\u628a\u975e ASCII \u6570\u636e\u91cd\u65b0\u7f16\u7801\u6210 ASCII \u5b57\u7b26\u4e32\u3002\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u70b9\u5728\u8ba1\u7b97\u673a\u7f51\u7edc\u91cc\u5c24\u5176\u5bb9\u6613\u8003\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u4e00\u4e2a\u5b57\u7b26\u5230\u5e95\u5360\u51e0\u4e2a\u5b57\u8282\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u8981\u770b\u4f7f\u7528\u7684\u7f16\u7801\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u80fd\u76f4\u63a5\u8bf4\u201c\u4e00\u4e2a\u5b57\u7b26\u7b49\u4e8e\u4e00\u4e2a\u5b57\u8282\u201d\u3002\u8fd9\u4e2a\u8bf4\u6cd5\u53ea\u5728\u67d0\u4e9b\u7f16\u7801\u4e0b\u6210\u7acb\uff0c\u6bd4\u5982\u6807\u51c6 ASCII\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u8fd9\u6837\u7406\u89e3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5b57\u7b26\u53ea\u662f\u62bd\u8c61\u7b26\u53f7\uff1b\n\u7f16\u7801\u51b3\u5b9a\u5b57\u7b26\u5982\u4f55\u53d8\u6210\u4e8c\u8fdb\u5236\uff1b\n\u4e0d\u540c\u7f16\u7801\u4e0b\uff0c\u540c\u4e00\u4e2a\u5b57\u7b26\u5360\u7528\u7684\u5b57\u8282\u6570\u53ef\u80fd\u4e0d\u540c\u3002\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3e\u51e0\u4e2a\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5b57\u7b26<\/th><th>ASCII<\/th><th>UTF-8<\/th><th>GBK<\/th><\/tr><\/thead><tbody><tr><td>A<\/td><td>1 \u5b57\u8282<\/td><td>1 \u5b57\u8282<\/td><td>1 \u5b57\u8282<\/td><\/tr><tr><td>0<\/td><td>1 \u5b57\u8282<\/td><td>1 \u5b57\u8282<\/td><td>1 \u5b57\u8282<\/td><\/tr><tr><td>\u4e2d<\/td><td>\u65e0\u6cd5\u8868\u793a<\/td><td>\u901a\u5e38 3 \u5b57\u8282<\/td><td>\u901a\u5e38 2 \u5b57\u8282<\/td><\/tr><tr><td>\ud83d\ude0a<\/td><td>\u65e0\u6cd5\u8868\u793a<\/td><td>\u901a\u5e38 4 \u5b57\u8282<\/td><td>\u901a\u5e38\u65e0\u6cd5\u8868\u793a<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u82f1\u6587\u5b57\u7b26 A\uff1a\nASCII \u53ef\u4ee5\u8868\u793a\uff0c\u5360 1 \u5b57\u8282\uff1b\nUTF-8 \u4e5f\u517c\u5bb9 ASCII\uff0c\u4e5f\u5360 1 \u5b57\u8282\u3002\n\n\u6c49\u5b57 \u4e2d\uff1a\nASCII \u4e0d\u80fd\u8868\u793a\uff1b\nUTF-8 \u901a\u5e38\u5360 3 \u5b57\u8282\uff1b\nGBK \u901a\u5e38\u5360 2 \u5b57\u8282\u3002\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001ASCII\u3001Unicode\u3001UTF-8 \u7684\u5173\u7cfb<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u90e8\u5206\u5bb9\u6613\u6df7\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>ASCII<\/strong> \u662f\u65e9\u671f\u5b57\u7b26\u7f16\u7801\uff0c\u53ea\u8986\u76d6\u82f1\u6587\u5b57\u7b26\u3001\u6570\u5b57\u548c\u5e38\u89c1\u7b26\u53f7\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Unicode<\/strong> \u662f\u5b57\u7b26\u96c6\uff0c\u76ee\u6807\u662f\u7ed9\u5168\u4e16\u754c\u6240\u6709\u5b57\u7b26\u7edf\u4e00\u7f16\u53f7\u3002\u6bd4\u5982\u6c49\u5b57\u3001\u65e5\u6587\u3001\u97e9\u6587\u3001emoji \u90fd\u53ef\u4ee5\u6709\u81ea\u5df1\u7684 Unicode \u7f16\u53f7\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>UTF-8<\/strong> \u662f Unicode \u7684\u4e00\u79cd\u5177\u4f53\u7f16\u7801\u65b9\u5f0f\u3002\u5b83\u8d1f\u8d23\u628a Unicode \u5b57\u7b26\u7f16\u7801\u6210\u5b57\u8282\u5e8f\u5217\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">UTF-8 \u7684\u7279\u70b9\u662f\u53d8\u957f\u7f16\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u82f1\u6587\u5b57\u7b26\uff1a1 \u5b57\u8282\n\u5e38\u89c1\u6b27\u6d32\u5b57\u7b26\uff1a2 \u5b57\u8282\u5de6\u53f3\n\u5e38\u7528\u6c49\u5b57\uff1a3 \u5b57\u8282\n\u90e8\u5206 emoji\uff1a4 \u5b57\u8282\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ASCII\uff1a\u56fa\u5b9a 7 bit\uff0c\u5b9e\u9645\u901a\u5e38\u5360 1 byte\nUTF-8\uff1a\u53d8\u957f\u7f16\u7801\uff0c1 \u5230 4 byte \u4e0d\u7b49\nGBK\uff1a\u4e2d\u6587\u73af\u5883\u5e38\u89c1\uff0c\u6c49\u5b57\u591a\u4e3a 2 byte\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u56de\u5230 SMTP \u90a3\u4e2a\u95ee\u9898<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP \u539f\u59cb\u8bbe\u8ba1\u53ea\u652f\u6301 7 \u4f4d ASCII\uff0c\u672c\u8d28\u4e0a\u662f\u8bf4\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SMTP \u65e9\u671f\u5e0c\u671b\u4f20\u8f93\u7684\u90ae\u4ef6\u5185\u5bb9\u7531 ASCII \u5b57\u7b26\u7ec4\u6210\u3002\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u90ae\u4ef6\u6b63\u6587\u662f\u82f1\u6587\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Hello, this is a mail.\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b83\u53ef\u4ee5\u76f4\u63a5\u4f20\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u5b57\u7b26\u90fd\u80fd\u7528 ASCII \u8868\u793a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u90ae\u4ef6\u6b63\u6587\u662f\u4e2d\u6587\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4f60\u597d\uff0c\u8fd9\u662f\u4e00\u5c01\u90ae\u4ef6\u3002\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b83\u4e0d\u80fd\u76f4\u63a5\u6309\u539f\u59cb SMTP \u4f20\uff0c\u56e0\u4e3a\u4e2d\u6587\u4e0d\u662f ASCII \u5b57\u7b26\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8e\u662f\u9700\u8981 MIME \u505a\u8f6c\u6362\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4e2d\u6587\u5185\u5bb9 \u2192 \u6309 UTF-8 \u7f16\u7801\u6210\u5b57\u8282 \u2192 \u518d\u7528 Base64 \u6216 Quoted-Printable \u7f16\u7801\u6210 ASCII \u6587\u672c \u2192 \u901a\u8fc7 SMTP \u4f20\u8f93\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6536\u4ef6\u65b9\u518d\u53cd\u5411\u5904\u7406\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ASCII \u7f16\u7801\u4e32 \u2192 Base64 \u89e3\u7801 \u2192 \u5f97\u5230 UTF-8 \u5b57\u8282 \u2192 \u6309 UTF-8 \u89e3\u91ca\u6210\u4e2d\u6587\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5 SMTP \u4e2d\u201c\u53ea\u652f\u6301 7 \u4f4d ASCII\u201d\u7684\u6838\u5fc3\u542b\u4e49\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4f20\u8f93\u901a\u9053\u539f\u672c\u53ea\u8ba4 ASCII \u6587\u672c\uff1b\n\u975e ASCII \u5185\u5bb9\u9700\u8981\u7ecf\u8fc7\u989d\u5916\u7f16\u7801\u540e\u624d\u80fd\u4f20\u3002\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001\u8003\u7814\u91cc\u600e\u4e48\u8bb0\u6700\u7a33<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u51e0\u4e2a\u7ed3\u8bba\u8981\u5206\u6e05\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 bit \u662f 0 \u6216 1\u3002\n1 byte \u901a\u5e38\u7b49\u4e8e 8 bit\u3002\n\n\u6807\u51c6 ASCII \u662f 7 \u4f4d\u5b57\u7b26\u7f16\u7801\uff0c\u80fd\u8868\u793a 128 \u4e2a\u5b57\u7b26\u3002\nASCII \u5b57\u7b26\u5728\u8ba1\u7b97\u673a\u4e2d\u901a\u5e38\u7528 1 \u4e2a\u5b57\u8282\u5b58\u50a8\uff0c\u6700\u9ad8\u4f4d\u4e3a 0\u3002\n\n\u6c49\u5b57\u4e0d\u80fd\u7528\u6807\u51c6 ASCII \u76f4\u63a5\u8868\u793a\u3002\n\u6c49\u5b57\u9700\u8981 GBK\u3001UTF-8\u3001UTF-16 \u7b49\u7f16\u7801\u65b9\u5f0f\u8868\u793a\u3002\n\n\u4e0d\u662f\u201c\u6c49\u5b57\u7528\u4e24\u4e2a ASCII \u7801\u8868\u793a\u201d\uff0c\u800c\u662f\u201c\u6c49\u5b57\u5728\u67d0\u4e9b\u7f16\u7801\u4e2d\u53ef\u80fd\u5360\u591a\u4e2a\u5b57\u8282\u201d\u3002\n\nUTF-8 \u662f\u53d8\u957f\u7f16\u7801\uff0c\u82f1\u6587\u901a\u5e38 1 \u5b57\u8282\uff0c\u6c49\u5b57\u901a\u5e38 3 \u5b57\u8282\u3002\nGBK \u4e2d\u5e38\u89c1\u6c49\u5b57\u901a\u5e38 2 \u5b57\u8282\u3002\n\nSMTP \u539f\u59cb\u534f\u8bae\u53ea\u652f\u6301 7 \u4f4d ASCII \u6587\u672c\uff0c\u56e0\u6b64\u4e2d\u6587\u3001\u9644\u4ef6\u3001\u56fe\u7247\u7b49\u8981\u901a\u8fc7 MIME \u7f16\u7801\u540e\u4f20\u8f93\u3002\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u53e5\u8bdd\u603b\u7ed3\u5c31\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ASCII \u662f\u5b57\u7b26\u5230\u6570\u5b57\u7684\u7f16\u7801\u89c4\u5219\uff0c\u6807\u51c6 ASCII \u7528 7 bit \u8868\u793a\u4e00\u4e2a\u5b57\u7b26\uff1b\u5b57\u8282\u662f\u5b58\u50a8\u5355\u4f4d\uff0c\u901a\u5e38 8 bit\u3002\u6c49\u5b57\u4e0d\u662f\u7531\u591a\u4e2a ASCII \u7801\u7ec4\u6210\uff0c\u800c\u662f\u901a\u8fc7 UTF-8\u3001GBK \u7b49\u5176\u4ed6\u7f16\u7801\u8868\u793a\u6210\u591a\u4e2a\u5b57\u8282\u3002\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>SMTP\u53ea\u652f\u6301\u4f20\u9001\u4e03\u6bd4\u7279\u7684ascii\u7801\u5185\u5bb9\uff0c\u662f\u4e0d\u662f\u8bf4\u8fd9\u4e2a\u7535\u5b50\u90ae\u4ef6\u5b83\u6240\u4f20\u9001\u7684\u91cf\u5f88\u5c11\uff1f \u4e0d\u662f\u3002\u201cSMTP \u53ea\u652f\u6301\u4f20 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[],"class_list":["post-2275","post","type-post","status-publish","format-standard","hentry","category-text"],"_links":{"self":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2275","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=2275"}],"version-history":[{"count":1,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2275\/revisions"}],"predecessor-version":[{"id":2277,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2275\/revisions\/2277"}],"wp:attachment":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=2275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=2275"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=2275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}