{"id":40150,"date":"2023-07-07T19:19:09","date_gmt":"2023-08-17T14:12:36","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8-kotlin-%e5%86%99-spring-boot-%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f\/"},"modified":"2024-01-15T10:30:47","modified_gmt":"2024-01-15T02:30:47","slug":"%e7%94%a8-kotlin-%e5%86%99-spring-boot-%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8-kotlin-%e5%86%99-spring-boot-%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f\/","title":{"rendered":"\u7528 Kotlin \u5199 Spring Boot \u5e94\u7528\u7a0b\u5e8f"},"content":{"rendered":"<p>\u6211\u5728IntelliJ IDEA\u4e0a\u770b\u5230\u4e00\u4e2a\u7c7b\u4f3c\u4e8e\u300c\u662f\u5426\u5e94\u7528Kotlin\u7684\u8bbe\u7f6e\uff1f\u300d\u7684\u63d0\u793a\uff0c\u4e8e\u662f\u8bd5\u7740\u70b9\u51fb\u4e86\u786e\u5b9a\uff0c\u5b83\u5e2e\u6211\u5728build.gradle\u4e2d\u6dfb\u52a0\u4e86\u8bbe\u7f6e\u3002\u800c\u4e14\uff0c\u6211\u53ef\u4ee5\u6beb\u4e0d\u8d39\u529b\u5730\u5f00\u59cb\u7f16\u5199Kotlin\uff0c\u4e00\u70b9\u90fd\u4e0d\u89c9\u5f97\u4e0d\u9002\u5e94\u3002\u975e\u5e38\u987a\u5229\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">buildscript<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">ext<\/span><span class=\"o\">.<\/span><span class=\"na\">kotlin_version<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'1.0.0-beta-2423'<\/span>\r\n    <span class=\"n\">repositories<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"n\">jcenter<\/span><span class=\"o\">()<\/span>\r\n        <span class=\"n\">maven<\/span> <span class=\"o\">{<\/span> <span class=\"n\">url<\/span> <span class=\"s2\">\"http:\/\/repo.spring.io\/snapshot\"<\/span> <span class=\"o\">}<\/span>\r\n        <span class=\"n\">maven<\/span> <span class=\"o\">{<\/span> <span class=\"n\">url<\/span> <span class=\"s2\">\"http:\/\/repo.spring.io\/milestone\"<\/span> <span class=\"o\">}<\/span>\r\n        <span class=\"n\">mavenCentral<\/span><span class=\"o\">()<\/span>\r\n    <span class=\"o\">}<\/span>\r\n    <span class=\"n\">dependencies<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"n\">classpath<\/span><span class=\"o\">(<\/span><span class=\"s2\">\"org.springframework.boot:spring-boot-gradle-plugin:1.3.0.RELEASE\"<\/span><span class=\"o\">)<\/span>\r\n        <span class=\"n\">classpath<\/span><span class=\"o\">(<\/span><span class=\"s2\">\"org.springframework:springloaded:1.2.4.RELEASE\"<\/span><span class=\"o\">)<\/span>\r\n        <span class=\"n\">classpath<\/span> <span class=\"s2\">\"org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version\"<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ apply plugin: 'java'<\/span>\r\n<span class=\"n\">apply<\/span> <span class=\"nl\">plugin:<\/span> <span class=\"s1\">'kotlin'<\/span>\r\n<span class=\"n\">apply<\/span> <span class=\"nl\">plugin:<\/span> <span class=\"s1\">'spring-boot'<\/span>\r\n<span class=\"n\">apply<\/span> <span class=\"nl\">plugin:<\/span> <span class=\"s1\">'idea'<\/span>\r\n\r\n<span class=\"n\">idea<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">module<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"n\">inheritOutputDirs<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">false<\/span>\r\n        <span class=\"n\">outputDir<\/span> <span class=\"o\">=<\/span> <span class=\"n\">file<\/span><span class=\"o\">(<\/span><span class=\"s2\">\"$buildDir\/classes\/main\/\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<span class=\"n\">jar<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">baseName<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'myproject'<\/span>\r\n    <span class=\"n\">version<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'0.0.1-SNAPSHOT'<\/span>\r\n<span class=\"o\">}<\/span>\r\n<span class=\"n\">repositories<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">jcenter<\/span><span class=\"o\">()<\/span>\r\n    <span class=\"n\">maven<\/span> <span class=\"o\">{<\/span> <span class=\"n\">url<\/span> <span class=\"s2\">\"http:\/\/repo.spring.io\/snapshot\"<\/span> <span class=\"o\">}<\/span>\r\n    <span class=\"n\">maven<\/span> <span class=\"o\">{<\/span> <span class=\"n\">url<\/span> <span class=\"s2\">\"http:\/\/repo.spring.io\/milestone\"<\/span> <span class=\"o\">}<\/span>\r\n    <span class=\"n\">mavenCentral<\/span><span class=\"o\">()<\/span>\r\n<span class=\"o\">}<\/span>\r\n<span class=\"n\">dependencies<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">compile<\/span> <span class=\"s2\">\"org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version\"<\/span>\r\n    <span class=\"n\">compile<\/span><span class=\"o\">(<\/span><span class=\"s2\">\"org.springframework.boot:spring-boot-starter-web\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"n\">testCompile<\/span><span class=\"o\">(<\/span><span class=\"s2\">\"org.springframework.boot:spring-boot-starter-test\"<\/span><span class=\"o\">)<\/span>\r\n<span class=\"o\">}<\/span>\r\n<span class=\"n\">sourceSets<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">main<\/span><span class=\"o\">.<\/span><span class=\"na\">java<\/span><span class=\"o\">.<\/span><span class=\"na\">srcDirs<\/span> <span class=\"o\">+=<\/span> <span class=\"s1\">'src\/main\/kotlin'<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u5b8c\u5168\u6ca1\u6709\u8bbe\u7f6e\u4e0a\u8ff0\u7684build.gradle\u6587\u4ef6\uff0c\u5b83\u662f\u7531IDEA\u81ea\u52a8\u6dfb\u52a0\u5230\u539f\u59cb\u7684Spring Boot\u914d\u7f6e\u4e2d\u7684\u3002\u5982\u679c\u4f7f\u7528IDEA\u8fdb\u884cKotlin\u7f16\u8bd1\uff0c\u5b83\u8fd8\u4f1a\u6b63\u786e\u52a0\u8f7dSpring Loaded\u3002<\/p>\n<p>\u6211\u8ba4\u4e3a\u5f88\u591a\u4eba\u90fd\u77e5\u9053\uff0cIDEA\uff08IntelliJ IDEA\uff09\u6709\u4e00\u4e2a\u795e\u5947\u7684\u529f\u80fd\uff0c\u5373\u5f53\u6211\u4eec\u5c06Java\u4ee3\u7801\u590d\u5236\u7c98\u8d34\u5230Scala\u4ee3\u7801\u4e2d\u65f6\uff0c\u5b83\u4f1a\u81ea\u52a8\u5c06\u5176\u8f6c\u6362\u4e3aScala\u4ee3\u7801\u3002\u800c\u8fd9\u4e2a\u529f\u80fd\u5728 JetBrains \u516c\u53f8\u5f00\u53d1\u7684 Kotlin \u4e2d\u4e5f\u50cf\u7406\u6240\u5f53\u7136\u5730\u5b58\u5728\u3002<\/p>\n<p>\u5c06\u6211\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\u5199\u7684Application.java\u7c98\u8d34\u8fdb\u53bb<br \/>\nhttp:\/\/qiita.com\/seratch@github\/items\/5b4cf1194c3bbd9b55b0<\/p>\n<p>\u5c31\u50cf\u8fd9\u6837\u7684\u611f\u89c9\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">friendlist<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.boot.SpringApplication<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.boot.autoconfigure.EnableAutoConfiguration<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.annotation.ComponentScan<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.annotation.Configuration<\/span>\r\n\r\n<span class=\"nd\">@Configuration<\/span>\r\n<span class=\"nd\">@EnableAutoConfiguration<\/span>\r\n<span class=\"nd\">@ComponentScan<\/span>\r\n<span class=\"n\">object<\/span> <span class=\"nc\">Application<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nd\">@JvmStatic<\/span> <span class=\"n\">fun<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nl\">args:<\/span> <span class=\"nc\">Array<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">SpringApplication<\/span><span class=\"o\">.<\/span><span class=\"na\">run<\/span><span class=\"o\">(<\/span><span class=\"nl\">Application:<\/span><span class=\"o\">:<\/span><span class=\"kd\">class<\/span><span class=\"err\">.<\/span><span class=\"nc\">java<\/span><span class=\"o\">,<\/span> <span class=\"o\">*<\/span><span class=\"n\">args<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5c3d\u7ba1\u4e00\u5f00\u59cb\u770b\u8d77\u6765\u5f88\u4e0d\u9519\uff0c\u4f46\u662f\u5982\u679cKotlin\u7684class\u6216object\u6ca1\u6709\u5e26\u6709open\u5173\u952e\u5b57\uff0c\u5b83\u4eec\u4f1a\u88ab\u58f0\u660e\u4e3afinal\uff0c\u56e0\u6b64Spring Boot\u5728\u542f\u52a8\u65f6\u4f1a\u663e\u793a\u201c\u8bf7\u79fb\u9664final\u5173\u952e\u5b57\u201d\u5e76\u5f15\u53d1\u542f\u52a8\u9519\u8bef\u3002<\/p>\n<p>\u5c3d\u7ba1\u5bf9 Kotlin \u4e0d\u592a\u719f\u6089\uff0c\u6211\u8fd8\u662f\u8bd5\u7740\u6a21\u4eff\u7740\u505a\u4e86\u4e00\u4e0b\uff0c\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff0c\u53ef\u4ee5\u8fd0\u884c\u3002<br \/>\nhttps:\/\/kotlinlang.org\/docs\/tutorials\/<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">friendlist<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.boot.SpringApplication<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.boot.autoconfigure.EnableAutoConfiguration<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.annotation.ComponentScan<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.annotation.Configuration<\/span>\r\n\r\n<span class=\"nd\">@Configuration<\/span>\r\n<span class=\"nd\">@EnableAutoConfiguration<\/span>\r\n<span class=\"nd\">@ComponentScan<\/span>\r\n<span class=\"n\">open<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Application<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">companion<\/span> <span class=\"n\">object<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nd\">@JvmStatic<\/span> <span class=\"n\">fun<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nl\">args:<\/span> <span class=\"nc\">Array<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;)<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"nc\">SpringApplication<\/span><span class=\"o\">.<\/span><span class=\"na\">run<\/span><span class=\"o\">(<\/span><span class=\"nl\">Application:<\/span><span class=\"o\">:<\/span><span class=\"kd\">class<\/span><span class=\"err\">.<\/span><span class=\"nc\">java<\/span><span class=\"o\">,<\/span> <span class=\"o\">*<\/span><span class=\"n\">args<\/span><span class=\"o\">)<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u8bd5\u7740\u5199\u4e86\u4e00\u4e2a\u8fd9\u6837\u7684\u63a7\u5236\u5668\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">friendlist.web<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">friendlist.model.Friend<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">friendlist.model.FriendResponse<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">friendlist.model.FriendsResponse<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.web.bind.annotation.PathVariable<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.web.bind.annotation.RequestMapping<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.web.bind.annotation.RestController<\/span>\r\n\r\n<span class=\"nd\">@RestController<\/span>\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">FriendsController<\/span> <span class=\"o\">{<\/span>\r\n\r\n    <span class=\"nd\">@RequestMapping<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\/\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"n\">fun<\/span> <span class=\"nf\">home<\/span><span class=\"o\">():<\/span> <span class=\"nc\">FriendsResponse<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nf\">all<\/span><span class=\"o\">()<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@RequestMapping<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\/friends\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"n\">fun<\/span> <span class=\"nf\">all<\/span><span class=\"o\">():<\/span> <span class=\"nc\">FriendsResponse<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nf\">FriendsResponse<\/span><span class=\"o\">(<\/span><span class=\"nc\">Friend<\/span><span class=\"o\">.<\/span><span class=\"na\">findAll<\/span><span class=\"o\">())<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@RequestMapping<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\/friends\/{id}\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"n\">fun<\/span> <span class=\"nf\">show<\/span><span class=\"o\">(<\/span><span class=\"nd\">@PathVariable<\/span> <span class=\"nl\">id:<\/span> <span class=\"nc\">Int<\/span><span class=\"o\">):<\/span> <span class=\"nc\">FriendResponse<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nf\">FriendResponse<\/span><span class=\"o\">(<\/span><span class=\"nc\">Friend<\/span><span class=\"o\">.<\/span><span class=\"na\">findById<\/span><span class=\"o\">(<\/span><span class=\"n\">id<\/span><span class=\"o\">))<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5173\u4e8emodel\u548cDAO\u7684\u793a\u4f8b\u3002\u7531\u4e8e\u6211\u60f3\u5c1d\u8bd5\u4f7f\u7528static\u5173\u952e\u5b57\uff0c\u6240\u4ee5\u6211\u53ea\u662f\u8fd9\u6837\u5199\u4e86\u4e00\u4e2a\u4f8b\u5b50\u3002\u6dfb\u52a0\u6216\u4e0d\u6dfb\u52a0JvmStatic\u4f3c\u4e4e\u90fd\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\uff0c\u4f46\u5728Kotlin\u4e2d\u5904\u7406\u8fd9\u4e24\u79cd\u65b9\u5f0f\u90fd\u53ef\u4ee5\u5417\uff1f\uff08\u6211\u4e0d\u592a\u786e\u5b9a\uff09<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">friendlist.model<\/span>\r\n<span class=\"n\">data<\/span> <span class=\"kd\">class<\/span> <span class=\"nf\">Friend<\/span><span class=\"o\">(<\/span><span class=\"n\">val<\/span> <span class=\"nl\">id:<\/span> <span class=\"nc\">Int<\/span><span class=\"o\">,<\/span> <span class=\"n\">val<\/span> <span class=\"nl\">name:<\/span> <span class=\"nc\">String<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">companion<\/span> <span class=\"n\">object<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kd\">private<\/span> <span class=\"n\">val<\/span> <span class=\"nl\">ALL_FRIENDS:<\/span> <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Friend<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"n\">listOf<\/span><span class=\"o\">(<\/span>\r\n                <span class=\"nc\">Friend<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"Alice\"<\/span><span class=\"o\">),<\/span>\r\n                <span class=\"nc\">Friend<\/span><span class=\"o\">(<\/span><span class=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"Bob\"<\/span><span class=\"o\">),<\/span>\r\n                <span class=\"nc\">Friend<\/span><span class=\"o\">(<\/span><span class=\"mi\">3<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"Chris\"<\/span><span class=\"o\">),<\/span>\r\n                <span class=\"nc\">Friend<\/span><span class=\"o\">(<\/span><span class=\"mi\">4<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"Denis\"<\/span><span class=\"o\">)<\/span>\r\n        <span class=\"o\">)<\/span>\r\n        <span class=\"n\">fun<\/span> <span class=\"nf\">findAll<\/span><span class=\"o\">():<\/span> <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Friend<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"no\">ALL_FRIENDS<\/span>\r\n        <span class=\"o\">}<\/span>\r\n        <span class=\"n\">fun<\/span> <span class=\"nf\">findById<\/span><span class=\"o\">(<\/span><span class=\"nl\">id:<\/span> <span class=\"nc\">Int<\/span><span class=\"o\">):<\/span> <span class=\"nc\">Friend<\/span><span class=\"o\">?<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"no\">ALL_FRIENDS<\/span><span class=\"o\">.<\/span><span class=\"na\">find<\/span> <span class=\"o\">{<\/span> <span class=\"n\">f<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">f<\/span><span class=\"o\">.<\/span><span class=\"na\">id<\/span> <span class=\"o\">==<\/span> <span class=\"n\">id<\/span> <span class=\"o\">}<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">friendlist.model<\/span>\r\n<span class=\"n\">data<\/span> <span class=\"kd\">class<\/span> <span class=\"nf\">FriendResponse<\/span><span class=\"o\">(<\/span><span class=\"n\">val<\/span> <span class=\"nl\">friend:<\/span> <span class=\"nc\">Friend<\/span><span class=\"o\">?)<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">friendlist.model<\/span>\r\n<span class=\"n\">data<\/span> <span class=\"kd\">class<\/span> <span class=\"nf\">FriendsResponse<\/span><span class=\"o\">(<\/span><span class=\"n\">val<\/span> <span class=\"nl\">friends:<\/span> <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Friend<\/span><span class=\"o\">&gt;)<\/span>\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u5c1d\u8bd5\u8bbf\u95ee\u65f6\uff0c\u54cd\u5e94\u4e3b\u4f53\u5f88\u597d\u5730\u8f6c\u6362\u4e3a\u4e86 JSON \u683c\u5f0f\u3002\u800c\u4e14\uff0c\u5373\u4f7f\u6211\u76f4\u63a5\u4f20\u9012 Kotlin \u7684 List \u6216\u8005 Friend \u7c7b\u578b\u7b49\u6570\u636e\uff0c\u7cfb\u7edf\u4e5f\u80fd\u5f88\u597d\u5730\u8fdb\u884c\u5904\u7406\uff0c\u4e0e Scala \u76f8\u6bd4\uff0c\u4e0e Java \u7684\u4e92\u64cd\u4f5c\u6027\u975e\u5e38\u987a\u7545\u3002<\/p>\n<pre class=\"post-pre\"><code>$ curl -v localhost:8080\/friends\r\n*   Trying ::1...\r\n* Connected to localhost (::1) port 8080 (#0)\r\n&gt; GET \/friends HTTP\/1.1\r\n&gt; Host: localhost:8080\r\n&gt; User-Agent: curl\/7.43.0\r\n&gt; Accept: *\/*\r\n&gt;\r\n&lt; HTTP\/1.1 200 OK\r\n&lt; Server: Apache-Coyote\/1.1\r\n&lt; Content-Type: application\/json;charset=UTF-8\r\n&lt; Transfer-Encoding: chunked\r\n&lt; Date: Tue, 24 Nov 2015 15:03:48 GMT\r\n&lt;\r\n* Connection #0 to host localhost left intact\r\n{\"friends\":[{\"id\":1,\"name\":\"Alice\"},{\"id\":2,\"name\":\"Bob\"},{\"id\":3,\"name\":\"Chris\"},{\"id\":4,\"name\":\"Denis\"}]}\r\n\r\n$ curl -v localhost:8080\/friends\/1\r\n*   Trying ::1...\r\n* Connected to localhost (::1) port 8080 (#0)\r\n&gt; GET \/friends\/1 HTTP\/1.1\r\n&gt; Host: localhost:8080\r\n&gt; User-Agent: curl\/7.43.0\r\n&gt; Accept: *\/*\r\n&gt;\r\n&lt; HTTP\/1.1 200 OK\r\n&lt; Server: Apache-Coyote\/1.1\r\n&lt; Content-Type: application\/json;charset=UTF-8\r\n&lt; Transfer-Encoding: chunked\r\n&lt; Date: Tue, 24 Nov 2015 15:03:50 GMT\r\n&lt;\r\n* Connection #0 to host localhost left intact\r\n{\"friend\":{\"id\":1,\"name\":\"Alice\"}}\r\n\r\n$ curl -v localhost:8080\/friends\/123\r\n*   Trying ::1...\r\n* Connected to localhost (::1) port 8080 (#0)\r\n&gt; GET \/friends\/123 HTTP\/1.1\r\n&gt; Host: localhost:8080\r\n&gt; User-Agent: curl\/7.43.0\r\n&gt; Accept: *\/*\r\n&gt;\r\n&lt; HTTP\/1.1 200 OK\r\n&lt; Server: Apache-Coyote\/1.1\r\n&lt; Content-Type: application\/json;charset=UTF-8\r\n&lt; Transfer-Encoding: chunked\r\n&lt; Date: Tue, 24 Nov 2015 15:03:54 GMT\r\n&lt;\r\n* Connection #0 to host localhost left intact\r\n{\"friend\":null}\r\n<\/code><\/pre>\n<p>\u987a\u5e26\u4e00\u63d0\uff0cQiita\u5728pre\u6807\u7b7e\u4e2d\u63d0\u4f9b\u4e86Kotlin\u8bed\u6cd5\u9ad8\u4eae\uff0c\u4f46\u4f3c\u4e4e\u8fd8\u65e0\u6cd5\u6b63\u786e\u8bc6\u522b&#8221;companion object { }&#8221;\u3002\u6682\u65f6\u5148\u6539\u4e3aJava\u5427\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6211\u5728IntelliJ IDEA\u4e0a\u770b\u5230\u4e00\u4e2a\u7c7b\u4f3c\u4e8e\u300c\u662f\u5426\u5e94\u7528Kotlin\u7684\u8bbe\u7f6e\uff1f\u300d\u7684\u63d0\u793a\uff0c\u4e8e\u662f\u8bd5\u7740\u70b9\u51fb\u4e86\u786e\u5b9a\uff0c\u5b83\u5e2e [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-40150","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO 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