{"id":302909,"date":"2024-05-20T18:47:06","date_gmt":"2024-05-20T10:47:06","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/302909.html"},"modified":"2024-05-20T18:47:16","modified_gmt":"2024-05-20T10:47:16","slug":"java%e4%b8%ad%e5%a6%82%e4%bd%95%e6%b7%b1%e5%88%bb%e7%9a%84%e7%90%86%e8%a7%a3%e4%bb%a3%e7%a0%81%e7%82%b9%e4%b8%8e%e4%bb%a3%e7%a0%81%e5%8d%95%e5%85%83-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/302909.html","title":{"rendered":"java\u4e2d\u5982\u4f55\u6df1\u523b\u7684\u7406\u89e3\u4ee3\u7801\u70b9\u4e0e\u4ee3\u7801\u5355\u5143"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26215008\/cee0f2cc-10bf-4805-8158-ba65dcfdb683.webp\" alt=\"java\u4e2d\u5982\u4f55\u6df1\u523b\u7684\u7406\u89e3\u4ee3\u7801\u70b9\u4e0e\u4ee3\u7801\u5355\u5143\" \/><\/p>\n<p><p>\u5728Java\u4e2d\uff0c\u6df1\u523b\u7406\u89e3\u4ee3\u7801\u70b9\u4e0e\u4ee3\u7801\u5355\u5143\u7684\u533a\u522b\u548c\u8054\u7cfb\u662f\u7406\u89e3\u5b57\u7b26\u7f16\u7801\u548c\u5b57\u7b26\u4e32\u5904\u7406\u7684\u5173\u952e\u3002\u4ee3\u7801\u70b9\uff08Code Point\uff09\u662f\u4efb\u4f55\u5b57\u7b26\u7684\u552f\u4e00\u6807\u8bc6\uff0c\u800c\u4ee3\u7801\u5355\u5143\uff08Code Unit\uff09\u662f\u7528\u4e8e\u5b9e\u73b0\u5b57\u7b26\u7f16\u7801\u7684\u5177\u4f53\u5b58\u50a8\u5355\u5143\u3002\u8fd9\u4e24\u8005\u4e4b\u95f4\u7684\u533a\u5206\uff0c\u5bf9\u4e8e\u5904\u7406\u591a\u6587\u5316\u5b57\u7b26\u96c6\u3001\u5b9e\u73b0\u56fd\u9645\u5316\u8f6f\u4ef6\u81f3\u5173\u91cd\u8981\u3002\u7279\u522b\u5730\uff0c\u4ee3\u7801\u70b9\u662f\u7406\u89e3Unicode\u7f16\u7801\u7684\u57fa\u7840\uff0c\u800c\u5728Java\u4e2d\uff0c<code>char<\/code>\u7c7b\u578b\u5b9e\u9645\u4e0a\u5b58\u50a8\u7684\u662f\u4ee3\u7801\u5355\u5143\u3002Java\u4f7f\u7528UTF-16\u7f16\u7801\uff0c\u56e0\u6b64\u4e00\u4e2a\u5b57\u7b26\u53ef\u80fd\u7531\u4e00\u4e2a\u6216\u4e24\u4e2a\u4ee3\u7801\u5355\u5143\u8868\u793a\u3002\u5f53\u5904\u7406\u5305\u542b\u56fd\u9645\u5316\u5185\u5bb9\u7684\u5b57\u7b26\u4e32\u65f6\uff0c\u4ec5\u4f9d\u9760<code>char<\/code>\u53ef\u80fd\u4e0d\u8db3\u4ee5\u8bbf\u95ee\u6240\u6709\u5b57\u7b26\uff0c\u8fd9\u662f\u56e0\u4e3a\u8d85\u51faU+FFFF\u8303\u56f4\u7684\u5b57\u7b26\uff08\u5373\u201c\u8f85\u52a9\u5b57\u7b26\u201d\uff09\u9700\u8981\u7528\u4e00\u5bf9<code>char<\/code>\u503c\uff08\u4e5f\u79f0\u4e3a\u4ee3\u7406\u5bf9\uff09\u6765\u8868\u793a\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4ee3\u7801\u70b9\u7406\u89e3<\/h3>\n<\/p>\n<p><p>\u4ee3\u7801\u70b9\u662f\u5b57\u7b26\u7684\u552f\u4e00\u6570\u5b57\u8868\u793a\u3002\u5728Unicode\u6807\u51c6\u4e2d\uff0c\u8fd9\u4e9b\u6570\u5b57\u4ece0\u52300x10FFFF\uff0c\u4e3a\u4e16\u754c\u4e0a\u5927\u591a\u6570\u4e66\u5199\u7cfb\u7edf\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5b57\u7b26\u3001\u6807\u70b9\u7b26\u53f7\u548c\u7b26\u53f7\u5b9a\u4e49\u4e00\u4e2a\u552f\u4e00\u7684\u503c\u3002\u8981\u6df1\u5165\u7406\u89e3\u4ee3\u7801\u70b9\uff0c\u6211\u4eec\u9700\u8981\u77e5\u9053Unicode\u6807\u51c6\u7684\u76ee\u7684\u662f\u63d0\u4f9b\u4e00\u4e2a\u7edf\u4e00\u7684\u7f16\u7801\u65b9\u5f0f\uff0c\u652f\u6301\u5168\u7403\u8303\u56f4\u5185\u6240\u6709\u7684\u4e66\u5199\u7cfb\u7edf\u3002\u6bcf\u4e2a\u5b57\u7b26\u88ab\u5206\u914d\u4e00\u4e2a\u6807\u51c6\u5316\u7684\u4ee3\u7801\u70b9\uff0c\u72ec\u7acb\u4e8e\u4efb\u4f55\u7279\u5b9a\u7684\u5b57\u7b26\u7f16\u7801\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><p>\u8fd9\u5176\u4e2d\uff0c\u6700\u5e7f\u4e3a\u4eba\u77e5\u7684\u8303\u56f4\u662f\u57fa\u672c\u591a\u6587\u79cd\u5e73\u9762\uff08BMP\uff09\uff0c\u4ee3\u7801\u70b9\u5728\u8fd9\u4e2a\u5e73\u9762\u7684\u8303\u56f4\u662f\u4ece0\u52300xFFFF\u3002\u4e00\u6bb5\u65f6\u95f4\u4ee5\u6765\uff0c\u8fd9\u4e2a\u8303\u56f4\u88ab\u8ba4\u4e3a\u8db3\u591f\u5305\u62ec\u6240\u6709\u7684\u5b57\u7b26\uff0c\u4f46\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\uff0c\u66f4\u591a\u7684\u5b57\u7b26\u548c\u7b26\u53f7\u88ab\u52a0\u5165\u5230Unicode\u4e2d\uff0c\u8d85\u51fa\u4e86\u8fd9\u4e2a\u8303\u56f4\uff0c\u4f7f\u5f97\u5f15\u5165\u4e86\u66f4\u591a\u7684\u5e73\u9762\u6765\u5305\u542b\u8fd9\u4e9b\u989d\u5916\u7684\u5b57\u7b26\uff0c\u8fd9\u4e5f\u662fJava\u4e2d\u4e3a\u4ec0\u4e48\u9700\u8981\u5904\u7406\u8d85\u51faBMP\u8303\u56f4\u7684\u5b57\u7b26\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u4ee3\u7801\u5355\u5143\u4e0eUTF-16<\/h3>\n<\/p>\n<p><p>Java\u5185\u90e8\u91c7\u7528UTF-16\u7f16\u7801\u6765\u8868\u793a\u5b57\u7b26\u4e32\uff0c\u8fd9\u610f\u5473\u7740\u6bcf\u4e2a<code>char<\/code>\u5b58\u50a8\u4e00\u4e2a16\u4f4d\u7684\u4ee3\u7801\u5355\u5143\u3002\u5bf9\u4e8eBMP\u4e2d\u7684\u5b57\u7b26\uff08U+0000\u81f3U+FFFF\u4e4b\u95f4\u7684\u4ee3\u7801\u70b9\uff09\uff0c\u6bcf\u4e2a\u5b57\u7b26\u6b63\u597d\u7531\u4e00\u4e2a\u4ee3\u7801\u5355\u5143\u8868\u793a\u3002\u7136\u800c\uff0c\u5bf9\u4e8e\u8d85\u51faBMP\u7684\u5b57\u7b26\uff0cUTF-16\u901a\u8fc7\u4e00\u5bf9\u8fde\u7eed\u7684\u4ee3\u7801\u5355\u5143\uff08\u79f0\u4e3a\u4ee3\u7406\u5bf9surrogate p<a href=\"https:\/\/docs.pingcode.com\/blog\/59162.html\" target=\"_blank\">AI<\/a>r\uff09\u6765\u8868\u793a\u4e00\u4e2a\u4ee3\u7801\u70b9\u3002\u8fd9\u79cd\u65b9\u6cd5\u5141\u8bb8UTF-16\u7f16\u7801\u8986\u76d6\u5168\u90e8Unicode\u8303\u56f4\uff0c\u4f46\u4e5f\u610f\u5473\u7740\u7a0b\u5e8f\u5458\u9700\u8981\u5728\u5904\u7406\u5b57\u7b26\u4e32\u65f6\u8003\u8651\u5230\u5b57\u7b26\u53ef\u80fd\u7531\u4e24\u4e2a<code>char<\/code>\u503c\u7ec4\u6210\u3002<\/p>\n<\/p>\n<p><p>\u7406\u89e3\u4ee3\u7801\u5355\u5143\u7684\u6982\u5ff5\u5bf9\u4e8e\u5904\u7406Java\u5b57\u7b26\u4e32\u975e\u5e38\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u5e38\u89c4\u65b9\u6cd5<code>length()<\/code>\u5b9e\u9645\u4e0a\u8fd4\u56de\u7684\u662f\u5b57\u7b26\u4e32\u4e2d\u4ee3\u7801\u5355\u5143\u7684\u6570\u91cf\uff0c\u800c\u4e0d\u662f\u5b9e\u9645\u7684\u5b57\u7b26\u6570\u3002\u5bf9\u4e8e\u5305\u542b\u8f85\u52a9\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6df7\u4e71\u548c\u9519\u8bef\u3002Java\u4e3a\u4e86\u652f\u6301\u5168\u8303\u56f4\u7684Unicode\uff0c\u63d0\u4f9b\u4e86\u4e00\u4e9b\u65b9\u6cd5\u5982<code>codePointAt(int index)<\/code>\u6765\u76f4\u63a5\u64cd\u4f5c\u4ee3\u7801\u70b9\uff0c\u800c\u4e0d\u662f\u4ee3\u7801\u5355\u5143\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u5728Java\u4e2d\u5904\u7406\u4ee3\u7801\u70b9<\/h3>\n<\/p>\n<p><p>\u4e3a\u4e86\u5145\u5206\u5229\u7528\u4ee3\u7801\u70b9\u548c\u4ee3\u7801\u5355\u5143\u7684\u533a\u522b\uff0cJava\u63d0\u4f9b\u4e86\u4e00\u5957API\uff0c\u4e13\u95e8\u5904\u7406Unicode\u7684\u5168\u8303\u56f4\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5305\u62ec\u5bf9\u5b57\u7b26\u4e32\u4e2d\u7684\u4ee3\u7801\u70b9\u8fdb\u884c\u8fed\u4ee3\u3001\u83b7\u53d6\u6307\u5b9a\u4ee3\u7801\u70b9\u7684\u5b57\u7b26\uff08\u53ef\u80fd\u662f\u4ee3\u7406\u5bf9\uff09\uff0c\u4ee5\u53ca\u628a\u4e00\u4e2a\u6216\u4e24\u4e2a\u4ee3\u7801\u5355\u5143\u8f6c\u6362\u4e3a\u5176\u5bf9\u5e94\u7684\u4ee3\u7801\u70b9\u7b49\u3002<\/p>\n<\/p>\n<p><p>\u5bf9\u4ee3\u7801\u70b9\u7684\u64cd\u4f5c\u901a\u5e38\u9700\u8981\u4f7f\u7528<code>Character<\/code>\u7c7b\u548c<code>String<\/code>\u7c7b\u63d0\u4f9b\u7684\u65b9\u6cd5\uff0c\u4f8b\u5982<code>Character.toCodePoint(char high, char low)<\/code>\u65b9\u6cd5\u80fd\u591f\u5c06\u4e00\u5bf9\u4ee3\u7406\u5355\u5143\u8f6c\u6362\u4e3a\u5176\u4ee3\u8868\u7684\u4ee3\u7801\u70b9\u3002\u540c\u65f6\uff0c<code>String<\/code>\u7c7b\u7684<code>codePointCount(int beginIndex, int 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