{"id":523865,"date":"2024-11-08T06:00:10","date_gmt":"2024-11-08T05:00:10","guid":{"rendered":"https:\/\/blog.jetbrains.com\/?post_type=kotlin&p=523865"},"modified":"2024-11-11T05:03:41","modified_gmt":"2024-11-11T04:03:41","slug":"ktor-3-0","status":"publish","type":"kotlin","link":"https:\/\/blog.jetbrains.com\/zh-hans\/kotlin\/2024\/11\/ktor-3-0\/","title":{"rendered":"Ktor 3.0 \u73b0\u5728\u63a8\u51fa\u65b0\u529f\u80fd\uff0c\u6027\u80fd\u4e5f\u5f97\u5230\u63d0\u5347"},"content":{"rendered":"

\u6b64\u65b0\u7248\u672c\u4f7f\u7528 Kotlin 2.0\uff0c\u5e76\u5207\u6362\u5230 kotlinx-io<\/a>\uff0c\u56e0\u6b64 Ktor \u66f4\u52a0\u73b0\u4ee3\u5316\uff0c\u4e0e\u5176\u4ed6 Kotlin \u5de5\u5177\u7684\u8fde\u63a5\u4e5f\u66f4\u597d\u3002 Ktor 3.0 \u7684\u8fd0\u884c\u901f\u5ea6\u66f4\u5feb\uff0c\u5e76\u63d0\u4f9b\u4e86\u66f4\u591a\u5ba2\u6237\u7aef-\u670d\u52a1\u5668\u5e94\u7528\u7a0b\u5e8f\u6784\u5efa\u9009\u9879\u3002<\/p>\n

\u5982\u679c\u60a8\u521a\u5f00\u59cb\u4f7f\u7528 Ktor \u6216\u9700\u8981\u4e86\u89e3\u5176\u8fd0\u4f5c\u65b9\u5f0f\uff0c\u8bf7\u9605\u8bfb\u6211\u4eec\u6700\u65b0\u53d1\u5e03\u7684\u535a\u6587 Ktor 101\uff1a\u9ad8\u6548\u7684 JVM HTTP \u5de5\u5177\u5305<\/a>\uff0c\u5176\u4e2d\u4ecb\u7ecd\u4e86\u5b83\u7684\u4e3b\u8981\u529f\u80fd\u3002<\/p>\n

\u4ee5\u4e0b\u535a\u6587\u5c06\u4e3a\u60a8\u5168\u9762\u6982\u8ff0 Ktor 3.0 \u4e2d\u7684\u6700\u65b0\u53d8\u5316\u548c\u6539\u8fdb\u3002<\/p>\n

\u7acb\u5373\u4f7f\u7528 Ktor 3.0 \u8fdb\u884c\u6784\u5efa\uff01<\/a><\/p>\n

<\/p>\n

\u8fc1\u79fb\u5230 kotlinx-io<\/h1>\n

\u6b64\u65b0\u7248\u672c\u4e2d\u6700\u5927\u7684\u66f4\u6539\u662f\u5207\u6362\u5230\u57fa\u4e8e Okio<\/a> \u7684 kotlinx-io<\/a> \u5e93\u3002 \u5982\u679c\u60a8\u4f7f\u7528 Ktor \u7684\u4f4e\u7ea7 IO API\uff0c\u6b64\u66f4\u6539\u53ef\u80fd\u4f1a\u5f71\u54cd\u60a8\u3002 \u6211\u4eec\u8fdb\u884c\u6b64\u66f4\u6539\u662f\u4e3a\u4e86\u6807\u51c6\u5316\u5404\u4e2a Kotlin \u5e93\u7684 IO \u529f\u80fd\u5e76\u63d0\u9ad8\u6027\u80fd\uff0c\u5982\u6211\u4eec\u7684\u57fa\u51c6\u6d4b\u8bd5\u6240\u793a\u3002<\/p>\n

\u91cd\u5927\u66f4\u6539<\/h2>\n

\u66f4\u6539\u4e3b\u8981\u5f71\u54cd\u4f4e\u7ea7 IO API\uff0c\u5305\u62ec Input<\/a>\u3001Output<\/a>\u3001ByteReadChannel<\/a> \u548c ByteWriteChannel<\/a> \u7b49\u7c7b\u3002 \u5982\u679c\u60a8\u76f4\u63a5\u4f7f\u7528\u8fd9\u4e9b\u7c7b\uff0c\u5c06\u4f1a\u770b\u5230\u5f03\u7528\u8b66\u544a\u3002 \u60a8\u5e94\u66f4\u65b0\u4ee3\u7801\uff0c\u4ee5\u4f7f\u7528 kotlinx-io \u5e93\u63d0\u4f9b\u7684\u66ff\u4ee3\u4ee3\u7801\u3002 \u522b\u62c5\u5fc3 \u2013 \u5728 4.0 \u7248\u672c\u53d1\u5e03\u4e4b\u524d\uff0c\u6211\u4eec\u5c06\u4e00\u76f4\u652f\u6301\u65e7 API\uff0c\u8ba9\u60a8\u6709\u5145\u8db3\u7684\u65f6\u95f4\u8fdb\u884c\u8fc1\u79fb\u3002<\/p>\n

\u65b0 kotlinx-io \u5e93\u63d0\u4f9b\u7684\u591a\u5e73\u53f0 API \u53ef\u4ee5\u5904\u7406\u5404\u79cd\u6570\u636e\u6e90\uff0c\u5e76\u63d0\u4f9b\u591a\u79cd\u529f\u80fd\uff0c\u5305\u62ec\u5904\u7406\u6587\u4ef6\u3001\u4f7f\u7528\u538b\u7f29\u7b49\u3002 \u6709\u5173\u8be6\u60c5\uff0c\u8bf7\u67e5\u9605 kotlinx-io API \u6587\u6863<\/a>\u3002<\/p>\n

\u6027\u80fd\u6539\u8fdb<\/h2>\n

\u5207\u6362\u5230 kotlinx-io \u540e\uff0c\u6211\u4eec\u51cf\u5c11\u4e86 ByteReadChannel<\/code>\u3001ByteWriteChannel<\/code> \u4e0e\u7f51\u7edc\u63a5\u53e3\u4e4b\u95f4\u4e0d\u5fc5\u8981\u7684\u5b57\u8282\u590d\u5236\u3002 \u8fd9\u6837\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u8fdb\u884c\u5b57\u8282\u8f6c\u6362\u548c\u89e3\u6790\uff0c\u4e3a\u672a\u6765\u7684\u6027\u80fd\u6539\u8fdb\u7559\u51fa\u4e86\u7a7a\u95f4\u3002<\/p>\n

\u57fa\u4e8e\u771f\u5b9e Ktor \u5e94\u7528\u7a0b\u5e8f\u7684 IO \u57fa\u51c6<\/a>\u6d4b\u8bd5\u7ed3\u679c\u4ee4\u4eba\u5370\u8c61\u6df1\u523b\u3002 \u4e00\u4e9b\u6d4b\u8bd5\u663e\u793a\uff0c\u6027\u80fd\u63d0\u9ad8\u4e86 90% \u4ee5\u4e0a\uff0c\u5e76\u4e14\u6211\u4eec\u6b63\u7740\u624b\u5b9e\u73b0\u66f4\u591a\u589e\u5f3a\u529f\u80fd\u3002<\/p>\n

\n
\"\"<\/figure>\n<\/figure>\n

\u652f\u6301\u670d\u52a1\u5668\u53d1\u9001\u4e8b\u4ef6 (SSE)<\/h1>\n

\u5728 Ktor 3.0 \u4e2d\uff0c\u6211\u4eec\u540c\u65f6\u4e3a\u670d\u52a1\u5668\u548c\u5ba2\u6237\u7aef\u589e\u52a0\u4e86\u5bf9\u670d\u52a1\u5668\u53d1\u9001\u4e8b\u4ef6 (SSE) \u7684\u521d\u6b65\u652f\u6301\u3002<\/p>\n

\u5229\u7528\u670d\u52a1\u5668\u53d1\u9001\u4e8b\u4ef6\u8fd9\u9879\u6280\u672f\uff0c\u670d\u52a1\u5668\u53ef\u4ee5\u901a\u8fc7 HTTP \u8fde\u63a5\u5411\u5ba2\u6237\u7aef\u63a8\u9001\u4e8b\u4ef6\u3002 SSE \u63d0\u4f9b\u4ece\u670d\u52a1\u5668\u5230\u5ba2\u6237\u7aef\u7684\u5355\u5411\u901a\u4fe1\u901a\u9053\u3002 \u5982\u679c\u670d\u52a1\u5668\u9700\u8981\u53d1\u9001\u57fa\u4e8e\u4e8b\u4ef6\u7684\u66f4\u65b0\uff0c\u4f46\u4e0d\u9700\u8981\u5ba2\u6237\u7aef\u53cd\u590d\u8f6e\u8be2\u83b7\u53d6\u65b0\u4fe1\u606f\uff0c\u5219\u975e\u5e38\u9002\u5408\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u3002<\/p>\n

\u8981\u5728 Ktor \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5b9e\u73b0 SSE \u652f\u6301\uff0c\u8bf7\u5148\u5c06 SSE \u4f9d\u8d56\u9879\u6dfb\u52a0\u5230\u60a8\u7684\u9879\u76ee\u7684\u6784\u5efa\u811a\u672c\u4e2d\uff1a<\/p>\n

implementation(\"io.ktor:ktor-server-sse-jvm\")<\/pre>\n
\u63a5\u4e0b\u6765\uff0c\u5728\u60a8\u7684 Ktor \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5b89\u88c5 SSE \u63d2\u4ef6\uff0c\u5e76\u4f7f\u7528 sse{}<\/code> \u51fd\u6570\u521b\u5efa\u7aef\u70b9\uff1a<\/p>\n
import io.ktor.server.application.*\nimport io.ktor.server.engine.*\nimport io.ktor.server.netty.*\nimport io.ktor.server.routing.*\nimport io.ktor.server.sse.*\nimport io.ktor.sse.*\nimport kotlinx.coroutines.delay\n\nfun main() {\n   embeddedServer(Netty, port = 8080) {\n       install(SSE)\n       routing {\n           sse {\n               repeat(42) {\n                   val name = call.parameters[\"name\"] ?: \"World\"\n                   send(ServerSentEvent(data = \"Hello, $name! $it\"))\n                   delay(1000)\n               }\n               close()\n           }\n       }\n   }.start(wait = true)\n}<\/pre>\n
\u5728 sse {...}<\/code> \u5757\u4e2d\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u529f\u80fd\u8bbf\u95ee ServerSSESession<\/code> \u5b9e\u4f8b\u3002<\/p>\n