{"id":878,"date":"2018-07-20T09:20:10","date_gmt":"2018-07-20T01:20:10","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=878"},"modified":"2018-07-20T09:20:10","modified_gmt":"2018-07-20T01:20:10","slug":"%e3%80%90%e5%ad%97%e7%ac%a6%e7%bc%96%e7%a0%81%e3%80%91%e5%ad%97%e7%ac%a6%e7%bc%96%e7%a0%81-base64%e7%bc%96%e7%a0%81%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=878","title":{"rendered":"\u3010\u5b57\u7b26\u7f16\u7801\u3011\u5b57\u7b26\u7f16\u7801 && Base64\u7f16\u7801\u7b97\u6cd5"},"content":{"rendered":"

\u4e00\u3001\u524d\u8a00<\/strong><\/p>\n

\u5728\u524d\u9762\u7684\u89e3\u51b3\u4e71\u7801\u7684\u4e00\u6587\u4e2d\uff0c\u53ea\u627e\u5230\u4e86\u89e3\u51b3\u529e\u6cd5\uff0c\u4f46\u662f\u6ca1\u6709\u4e3a\u4ec0\u4e48\uff0c\u8bf4\u767d\u4e86\uff0c\u5c31\u662f\u5bf9\u7f16\u7801\u8fd8\u662f\u4e0d\u662f\u592a\u719f\u6089\uff0c\u7f16\u7801\u95ee\u9898\u662f\u4e00\u4e2a\u5f88\u7b80\u5355\u7684\u95ee\u9898\uff0c\u8ba1\u7b97\u673a\u4ece\u4e1a\u4eba\u5458\u5e94\u8be5\u4e5f\u5fc5\u987b\u5f04\u6e05\u695a\uff0c\u57fa\u4e8e\u7f16\u7801\u7684\u5e94\u7528\u6709Base64\u52a0\u5bc6\u7b97\u6cd5\uff0c\u7136\u540e\uff0c\u8fd9\u4e2a\u95ee\u9898\u4e00\u76f4\u653e\u7740\uff0c\u60f3\u627e\u4e2a\u673a\u4f1a\u89e3\u51b3\u3002\u4e8e\u662f\u4e4e\uff0c\u7ec8\u4e8e\u902e\u5230\u673a\u4f1a\uff0c\u5f00\u59cb\u4e0b\u624b\u3002<\/p>\n

\u4e8c\u3001\u7f16\u7801<\/strong><\/p>\n

\u5173\u4e8eASCII\u3001Unicode\u7f16\u7801\u3001UTF-8\u7f16\u7801\u7b49\u95ee\u9898\uff0c\u53ef\u4ee5\u53c2\u89c1\u7b14\u8005\u53e6\u5916\u4e00\u7bc7\u535a\u5ba2\u3010\u5b57\u7b26\u7f16\u7801\u3011\u5f7b\u5e95\u7406\u89e3\u5b57\u7b26\u7f16\u7801<\/a>\u3002<\/p>\n

\u4e09\u3001Base64\u7b97\u6cd5<\/strong><\/p>\n

Base64\u662f\u7f51\u7edc\u4e0a\u6700\u5e38\u89c1\u7684\u7528\u4e8e\u4f20\u8f938Bit\u5b57\u8282\u4ee3\u7801\u7684\u7f16\u7801\u65b9\u5f0f\u4e4b\u4e00\uff0c\u5173\u4e8eBase64\u7684\u4ecb\u7ecd\u53ef\u4ee5\u53c2\u89c1\u8fd9\u4e24\u7bc7\u6587\u7ae0base64<\/a>\uff0cBASE64\u7b97\u6cd5<\/a>\uff0c\u4e0b\u9762\u6211\u4eec\u901a\u8fc7Java\u6765\u5b9e\u73b0Base64\u7f16\u7801\u7b97\u6cd5\u5e76\u4e14\u8be6\u7ec6\u89e3\u6790\u5176\u4e2d\u9047\u5230\u7684\u95ee\u9898\u3002<\/p>\n

Base64\u7f16\u7801\u7b97\u6cd5\u7684\u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/p>\n

\"\"<\/p>\n

\u8bf4\u660e\uff1aBase64\u89c4\u5219\u8868\u7531Base64\u7684\u89c4\u5b9a\u7684\u89c4\u5219\u5f97\u5230\uff0c\u800c\u9006\u5411Base64\u89c4\u5219\u8868\u5219\u901a\u8fc7\u5c11\u91cf\u7684\u8ba1\u7b97\u83b7\u5f97\uff0c\u5982\u67d0Base64\u7684\u7f16\u7801\u5b57\u7b26\u4e32\u4e3aQQ==\uff0c\u5bf9\u4e8e\u5b57\u7b26Q\u800c\u8a00\uff0cQ\u7684ASCII\u7f16\u7801\u4e3a81\uff0cBase64\u89c4\u5219\u4e2d\uff0c16\u5bf9\u5e94Q\uff0c\u5219\u5c06\u9006\u5411Base64\u8868\u4e2d\u4e0b\u6807\u4e3a81\u7684\u9879\u7f6e\u4e3a16\u3002\u5176\u4f59\u4e0d\u5728Base64\u4e2d\u7684\u5143\u7d20\u5728\u9006\u5411\u8868\u4e2d\u503c\u4e3a-1\uff0c\u9006\u5411\u8868\u7684\u8ba1\u7b97\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n

\"\"<\/p>\n

\u56db\u3001Base64\u7b97\u6cd5\u7684Java\u5b9e\u73b0<\/strong><\/p>\n

Java\u4e2d\u7684\u5b57\u7b26\u90fd\u662f\u4ee5Unicode\u683c\u5f0f\u8fdb\u884c\u5b58\u50a8\u7684\uff0c\u5982\u4f55\u67e5\u770b\u4efb\u4e00\u4e2a\u5b57\u7b26\u5728Java\u4e2d\u7684\u8868\u793a\uff1f\u4f7f\u7528\u5982\u4e0b\u4ee3\u7801\u5373\u53ef<\/p>\n

\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
import java.io.UnsupportedEncodingException;\npublic class Test {\n    public static void main(String[] args) throws UnsupportedEncodingException {\n        String str = \"\u5f20\";\n        byte[] bytes = str.getBytes(\"utf-8\");\n        for (int i = 0; i < bytes.length; i++) {\n            System.out.print(Integer.toHexString(bytes[i] & 0xff).toUpperCase() + \" \");\n        }\n    }\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
E5 BC A0<\/p>\n
\u8bf4\u660e\uff1a\u5047\u8bbe\u4e2d\u6587\u5f20\u7684\u7f16\u7801\u4e3aGBK\uff0c\u5219\u8f6c\u5316\u4e3aUTF-8\u7f16\u7801\u7ecf\u8fc7\u4e86GBK->Unicode->UTF-8\u7684\u6b65\u9aa4\u3002<\/p>\n
Base64\u7b97\u6cd5\u4ee3\u7801\u6e05\u5355<\/p>\n
\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
package com.leesf.chapter10;\n\nimport java.io.UnsupportedEncodingException;\n\npublic class Base64 {\n    private static char[] base64EncodeChars = new char[] { 'A', 'B', 'C', 'D',\n            'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',\n            'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',\n            'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',\n            'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3',\n            '4', '5', '6', '7', '8', '9', '+', '\/' };\n\n    private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1,\n            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,\n            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,\n            -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59,\n            60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,\n            10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1,\n            -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,\n            38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1,\n            -1, -1 };\n\n    public static String encode(byte[] data) {\n        StringBuffer sb = new StringBuffer();\n        int len = data.length;\n        int i = 0;\n        int b1, b2, b3;\n        while (i < len) {\n            \/\/ \u63d0\u53d6b1\n            b1 = data[i++] & 0xff;\n            if (i == len) { \/\/ len % 3 == 1\n                \/\/ \u5411\u53f3\u65e0\u7b26\u53f7\u79fb\u52a82\u4f4d\uff0c\u4fdd\u7559b1\u76840-5\u4f4d\uff08\u524d\u516d\u4f4d\uff09\n                sb.append(base64EncodeChars[b1 >>> 2]);\n                \/\/ \u4fdd\u7559b1\u76846-7\u4f4d\uff08\u540e\u4e24\u4f4d\uff09\uff0c\u5176\u4f59\u4f4d\u4e3a0\uff0c\u7136\u540e\u5411\u5de6\u79fb\u52a84\u4f4d\uff0c\u4f4e\u4f4d\u88650\n                sb.append(base64EncodeChars[(b1 & 0x3) << 4]);\n                \/\/ \u6dfb\u52a0\u4e24\u4e2a\u7b49\u53f7\uff08Base64\u89c4\u5219\uff09\n                sb.append(\"==\");\n                \/\/ \u8df3\u51fa\u5faa\u73af\n                break;\n            }\n            \/\/ \u63d0\u53d6b2\n            b2 = data[i++] & 0xff;\n            if (i == len) { \/\/ len % 3 == 2\n                \/\/ \u4fdd\u7559b1\u76840-5\u4f4d\uff08\u524d\u516d\u4f4d\uff09\uff0c\u5176\u4f59\u4f4d\u4e3a0\n                sb.append(base64EncodeChars[b1 >>> 2]);\n                \/\/ \u4fdd\u7559b1\u76846-7\u4f4d\uff08\u540e\u4e24\u4f4d\uff09\uff0c\u5176\u4f59\u4f4d\u4e3a0\uff0c\u7136\u540e\u5411\u5de6\u79fb\u52a84\u4f4d\uff0c\u4f4e\u4f4d\u88650\n                \/\/ \u7136\u540e\u4fdd\u7559b2\u76840-3\u4f4d\uff08\u524d\u56db\u4f4d\uff09\uff0c\u7136\u540e\u5408\u5e76\n                sb.append(base64EncodeChars[((b1 & 0x03) << 4)\n                        | ((b2 & 0xf0) >>> 4)]);\n                sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);\n                \/\/ \u6dfb\u52a0\u4e24\u4e2a\u7b49\u53f7\uff08Base64\u89c4\u5219\uff09\n                sb.append(\"=\");\n                \/\/ \u8df3\u51fa\u5faa\u73af\n                break;\n            }\n            \/\/ \u63d0\u53d6b3\n            b3 = data[i++] & 0xff;\n            \/\/ \u5411\u53f3\u65e0\u7b26\u53f7\u79fb\u52a82\u4f4d\uff0c\u4fdd\u7559b1\u76840-5\u4f4d\uff08\u524d\u516d\u4f4d\uff09\n            sb.append(base64EncodeChars[b1 >>> 2]);\n            \/\/ \u4fdd\u7559b1\u76846-7\u4f4d\uff08\u540e\u4e24\u4f4d\uff09\uff0c\u5176\u4f59\u4f4d\u4e3a0\uff0c\u7136\u540e\u5411\u5de6\u79fb\u52a84\u4f4d\uff0c\u4f4e\u4f4d\u88650\n            \/\/ \u7136\u540e\u4fdd\u7559b2\u76840-3\u4f4d\uff08\u524d\u56db\u4f4d\uff09\uff0c\u7136\u540e\u5408\u5e76\n            sb.append(base64EncodeChars[((b1 & 0x03) << 4)\n                    | ((b2 & 0xf0) >>> 4)]);\n            \/\/ \u4fdd\u7559b2\u76844-7\u4f4d\uff08\u540e\u56db\u4f4d\uff09\uff0c\u7136\u540e\u5411\u53f3\u79fb2\u4f4d\uff0c\u4f4e\u4f4d\u88650\uff0c\n            \/\/ \u7136\u540e\u4fdd\u7559b3\u76840-1\u4f4d\uff08\u524d\u4e24\u4f4d\uff09\uff0c\u7136\u540e\u5408\u5e76\n            sb.append(base64EncodeChars[((b2 & 0x0f) << 2)\n                    | ((b3 & 0xc0) >>> 6)]);\n            \/\/ \u4fdd\u7559b3\u76842-7\u4f4d\uff08\u540e\u516d\u4f4d\uff09\n            sb.append(base64EncodeChars[b3 & 0x3f]);\n        }\n        return sb.toString();\n    }\n\n    public static byte[] decode(String str) throws UnsupportedEncodingException {\n        \/\/ \u4f7f\u7528ISO8859-1\u642d\u914d\u5176\u4ed6\u7f16\u7801\u5982UTF-8,GBK\u53ef\u4ee5\u663e\u793a\u4e2d\u6587\n        StringBuffer sb = new StringBuffer();\n        \/\/ \u83b7\u53d6ASCII\u7801\n        byte[] data = str.getBytes(\"US-ASCII\");\n        int len = data.length;\n        int i = 0;\n        int b1, b2, b3, b4;\n        while (i < len) {\n            do {\n                b1 = base64DecodeChars[data[i++]];\n            } while (i < len && b1 == -1);\n            if (b1 == -1)\n                break;\n            do {\n                b2 = base64DecodeChars[data[i++]];\n            } while (i < len && b2 == -1);\n            if (b2 == -1)\n                break;\n            \/\/ b1\u5411\u5de6\u79fb2\u4f4d\uff0c\u7136\u540eb2\u4fdd\u75592-3\u4f4d\uff0c\u518d\u5411\u53f3\u65e0\u7b26\u53f7\u79fb\u52a84\u4f4d\uff0c\u518d\u5408\u5e76\n            sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4)));\n            do {\n                b3 = data[i++];\n                if (b3 == 61) \/\/ \u9047\u5230\u4e86=\u53f7\uff0c\u7ed3\u675f\uff0c\u8fd4\u56de\n                    return sb.toString().getBytes(\"ISO8859-1\");\n                b3 = base64DecodeChars[b3];\n            } while (i < len && b3 == -1);\n            if (b3 == -1)\n                break;\n            \/\/ \u63d0\u53d6b2\u76844-7\u4f4d\uff08\u540e\u56db\u4f4d\uff09\uff0c\u518d\u5411\u5de6\u79fb\u52a84\u4f4d\uff0cb3\u4fdd\u75592-5\u4f4d\uff0c\u518d\u5411\u53f3\u65e0\u7b26\u53f7\u79fb\u52a82\u4f4d\n            sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));\n            do {\n                b4 = data[i++];\n                if (b4 == 61) \/\/ \u9047\u5230\u4e86=\u53f7\uff0c\u7ed3\u675f\uff0c\u8fd4\u56de\n                    return sb.toString().getBytes(\"ISO8859-1\");\n                b4 = base64DecodeChars[b4];\n            } while (i < len && b4 == -1);\n            if (b4 == -1)\n                break;\n            \/\/ \u63d0\u53d6b3\u76846-7\u4f4d\uff08\u6700\u540e\u4e24\u4f4d\uff09\uff0c\u518d\u5411\u5de6\u79fb\u52a86\u4f4d\uff0c\u518d\u53d6b4\u76842-7\u4f4d\uff08\u540e\u516d\u4f4d\uff09\uff0c\u7136\u540e\u5408\u5e76b4\n            sb.append((char) (((b3 & 0x03) << 6) | (b4 & 0x3f)));\n        }\n        return sb.toString().getBytes(\"ISO8859-1\");\n    }\n\n    public static void main(String[] args) throws UnsupportedEncodingException {\n        String s = \"\u5f20\";\n        System.out.println(\"\u7f16\u7801\u524d\uff1a\" + s);\n        String x = encode(s.getBytes());\n        System.out.println(\"\u7f16\u7801\u540e\uff1a\" + x);\n        String x1 = new String(decode(x));\n        System.out.println(\"\u89e3\u7801\u540e\uff1a\" + x1);\n    }\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
\u7f16\u7801\u524d\uff1a\u5f20
\n\u7f16\u7801\u540e\uff1a5byg
\n\u89e3\u7801\u540e\uff1a\u5f20
\n\u8bf4\u660e\uff1a\u7406\u89e3\u4e86Base64\u7684\u7f16\u7801\u89e3\u7801\u8fc7\u7a0b\uff0c\u90a3\u4e48\u4ee3\u7801\u4e5f\u5f88\u597d\u7406\u89e3\u3002<\/p>\n
\u4e94\u3001\u603b\u7ed3<\/strong><\/p>\n
\u7ecf\u8fc7\u6b64\u7bc7\u535a\u6587\uff0c\u5bf9\u5b57\u7b26\u7f16\u7801\u7684\u7406\u89e3\u66f4\u6df1\u523b\u4e86\uff0c\u660e\u767d\u4e86\u5b57\u7b26\u7f16\u7801\u4e4b\u95f4\u7684\u5982\u4f55\u8fdb\u884c\u8f6c\u5316\uff0c\u6709\u4e86\u8fd9\u4e2a\u57fa\u7840\u540e\uff0c\u518d\u770b\u5176\u4ed6\u4e0e\u5b57\u7b26\u7f16\u7801\u76f8\u5173\u7684\u77e5\u8bc6\u5c06\u66f4\u5bb9\u6613\uff0c\u7279\u6b64\u8bb0\u5f55\uff0c\u4ee5\u540e\u9047\u5230\u4e0e\u5b57\u7b26\u7f16\u7801\u76f8\u5173\u7684\u95ee\u9898\u8fd8\u4f1a\u8fdb\u884c\u8bb0\u5f55\u3002\u8c22\u8c22\u5404\u4f4d\u56ed\u53cb\u89c2\u770b~<\/p>\n","protected":false},"excerpt":{"rendered":"
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