{"id":889,"date":"2023-06-09T23:08:01","date_gmt":"2023-06-09T14:08:01","guid":{"rendered":"https:\/\/daba-no-heya.com\/?p=889"},"modified":"2025-02-15T11:19:09","modified_gmt":"2025-02-15T02:19:09","slug":"post-889","status":"publish","type":"post","link":"https:\/\/daba-no-heya.com\/?p=889","title":{"rendered":"Java\u3067YAML\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080(Jackson)"},"content":{"rendered":"\n<p>2025-02-15\u8ffd\u8a18:<br>record\u3092\u4f7f\u3063\u3066YAML\u306e\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\u3092\u8a18\u4e8b\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002<br><a href=\"https:\/\/daba-no-heya.com\/?p=1432\" data-type=\"post\" data-id=\"1432\">\u3010Java\u3011Jackson\u3067YAML\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080(record\u4f7f\u7528)<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Java\u3067YAML\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092\u6271\u3046\u305f\u3081\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u304c\u3001\u4eca\u56de\u306fJackson\u3092\u4f7f\u3063\u3066\u307f\u307e\u3059\u3002<br><a rel=\"noreferrer noopener\" href=\"https:\/\/mvnrepository.com\/search?q=jackson+yaml\" data-type=\"URL\" data-id=\"https:\/\/mvnrepository.com\/search?q=jackson+yaml\" target=\"_blank\">Maven Repository<\/a>\u3067\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u691c\u7d22\u3057\u3066\u3001pom.xml\u306edependencies\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002<br>\u3053\u306e\u8a18\u4e8b\u306e\u57f7\u7b46\u6642\u306e\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u306f2.15.2\u306a\u306e\u3067\u3001\u305d\u308c\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;properties&gt;\n    &lt;maven.compiler.source&gt;18&lt;\/maven.compiler.source&gt;\n    &lt;maven.compiler.target&gt;18&lt;\/maven.compiler.target&gt;\n    &lt;project.build.sourceEncoding&gt;UTF-8&lt;\/project.build.sourceEncoding&gt;\n&lt;\/properties&gt;\n\n&lt;dependencies&gt;\n    &lt;dependency&gt;\n        &lt;groupId&gt;com.fasterxml.jackson.core&lt;\/groupId&gt;\n        &lt;artifactId&gt;jackson-databind&lt;\/artifactId&gt;\n        &lt;version&gt;2.15.2&lt;\/version&gt;\n    &lt;\/dependency&gt;\n    &lt;dependency&gt;\n        &lt;groupId&gt;com.fasterxml.jackson.dataformat&lt;\/groupId&gt;\n        &lt;artifactId&gt;jackson-dataformat-yaml&lt;\/artifactId&gt;\n        &lt;version&gt;2.15.2&lt;\/version&gt;\n    &lt;\/dependency&gt;\n&lt;\/dependencies&gt;<\/code><\/pre>\n\n\n\n<p>\u4ee5\u4e0b\u306eYAML\u30d5\u30a1\u30a4\u30eb(users.yaml)\u3092\u8aad\u307f\u8fbc\u307f\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>- email: tanaka@example.com\n  name: Tanaka-san\n  age: 20\n  metadata:\n    country: Japan\n    city: Tokyo\n    message: \u3053\u3093\u306b\u3061\u306f\uff01\n- email: smith@example.com\n  name: John Smith\n  age: 32\n  metadata:\n    country: United States\n    city: New York\n    message: Hello!\n- email: ivan@example.com\n  name: Ivan Petrovich\n  age: 51\n  metadata:\n    country: Russia\n    city: Saint-Petersburg\n    message: \u041f\u0440\u0438\u0432\u0435\u0442!\n<\/code><\/pre>\n\n\n\n<p>YAML\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080Java\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-luxe-blocks-syntaxhighlighter line-numbers language-java\"><code class=\"language-java\">package com.github.maeda6uiui.loadyamlsample;\n\nimport com.fasterxml.jackson.core.type.TypeReference;\nimport com.fasterxml.jackson.databind.JsonNode;\nimport com.fasterxml.jackson.databind.ObjectMapper;\nimport com.fasterxml.jackson.databind.node.ArrayNode;\nimport com.fasterxml.jackson.dataformat.yaml.YAMLFactory;\n\nimport java.io.IOException;\nimport java.nio.file.Files;\nimport java.nio.file.Paths;\nimport java.util.Arrays;\nimport java.util.List;\n\nclass Metadata {\n    public String country;\n    public String city;\n    public String message;\n\n    @Override\n    public String toString() {\n        return String.format(\"\\tcountry=%s city=%s message=%s\", country, city, message);\n    }\n}\n\nclass User {\n    public String email;\n    public String name;\n    public int age;\n    public Metadata metadata;\n\n    @Override\n    public String toString() {\n        var sb = new StringBuilder();\n\n        sb.append(String.format(\"===== %s =====\\n\", email));\n        sb.append(\"name=\" + name + \"\\n\");\n        sb.append(\"age=\" + age + \"\\n\");\n        sb.append(\"metadata=\\n\");\n        sb.append(metadata.toString());\n\n        return sb.toString();\n    }\n}\n\npublic class Main {\n    public static void main(String[] args) {\n        try {\n            String yaml = Files.readString(Paths.get(\"users.yaml\"));\n\n            var mapper = new ObjectMapper(new YAMLFactory());\n\n            \/\/POJO\u3092\u7528\u3044\u305f\u8aad\u8fbc\u51e6\u7406\n            User[] users = mapper.readValue(yaml, User[].class);\n            Arrays.asList(users).forEach(System.out::println);\n\n            \/\/\u4e0a\u306eArrays.asList...\u306f\u4ee5\u4e0b\u306efor\u6587\u3068\u540c\u3058\u51e6\u7406\n            for (int i = 0; i &lt; users.length; i++) {\n                System.out.println(users[i]);\n            }\n\n            \/\/Map\u3092\u7528\u3044\u305f\u8aad\u8fbc\u51e6\u7406\n            var typeRef = new TypeReference&lt;List&lt;Object>>() {\n            };\n            List&lt;Object> objects = mapper.readValue(yaml, typeRef);\n            objects.forEach(System.out::println);\n\n            \/\/JsonNode\u3092\u7528\u3044\u305f\u8aad\u8fbc\u51e6\u7406\n            JsonNode node = mapper.readTree(yaml);\n            ArrayNode usersNode = (ArrayNode) node;\n            for (int i = 0; i &lt; usersNode.size(); i++) {\n                JsonNode userNode = usersNode.get(i);\n                System.out.println(userNode.get(\"email\").asText());\n            }\n\n            \/\/\u30c7\u30fc\u30bf\u3092JSON\u5f62\u5f0f\u3067\u30d5\u30a1\u30a4\u30eb\u306b\u51fa\u529b\u3059\u308b\n            var jsonMapper = new ObjectMapper();\n            String json = jsonMapper.writerWithDefaultPrettyPrinter().writeValueAsString(users);\n            Files.writeString(Paths.get(\"users.json\"), json);\n        } catch (IOException e) {\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>POJO\u3092\u7528\u3044\u3066\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080\u306e\u304c\u4e00\u756a\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u306b\u306a\u308b\u3068\u601d\u3044\u307e\u3059\u3002<br>YAML\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u8868\u3059\u30af\u30e9\u30b9\u3092\u7528\u610f\u3057\u3066\u3001ObjectMapper\u306ereadValue\u30e1\u30bd\u30c3\u30c9\u3067\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u307f\u307e\u3059\u3002<br>toString\u306f\u8aad\u307f\u8fbc\u3093\u3060\u30c7\u30fc\u30bf\u3092\u3044\u3044\u611f\u3058\u3067\u8868\u793a\u3055\u305b\u308b\u305f\u3081\u306b\u8ffd\u52a0\u3057\u305f\u3060\u3051\u306a\u306e\u3067\u3001\u5225\u306b\u306a\u304f\u3066\u3082\u69cb\u3044\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<pre class=\"wp-block-luxe-blocks-syntaxhighlighter line-numbers language-java\"><code class=\"language-java\">class Metadata {\n    public String country;\n    public String city;\n    public String message;\n\n    @Override\n    public String toString() {\n        return String.format(\"\\tcountry=%s city=%s message=%s\", country, city, message);\n    }\n}\n\nclass User {\n    public String email;\n    public String name;\n    public int age;\n    public Metadata metadata;\n\n    @Override\n    public String toString() {\n        var sb = new StringBuilder();\n\n        sb.append(String.format(\"===== %s =====\\n\", email));\n        sb.append(\"name=\" + name + \"\\n\");\n        sb.append(\"age=\" + age + \"\\n\");\n        sb.append(\"metadata=\\n\");\n        sb.append(metadata.toString());\n\n        return sb.toString();\n    }\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-luxe-blocks-syntaxhighlighter line-numbers language-java\"><code class=\"language-java\">var mapper = new ObjectMapper(new YAMLFactory());\n\n\/\/POJO\u3092\u7528\u3044\u305f\u8aad\u8fbc\u51e6\u7406\nUser[] users = mapper.readValue(yaml, User[].class);\nArrays.asList(users).forEach(System.out::println);<\/code><\/pre>\n\n\n\n<p>\u5404\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u3092YAML\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u3068\u540c\u3058\u306b\u3057\u3066\u304a\u304f\u3068\u3001\u81ea\u52d5\u7684\u306b\u5024\u304c\u30bb\u30c3\u30c8\u3055\u308c\u307e\u3059\u3002<br>\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u3068YAML\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u304c\u7570\u306a\u308b\u5834\u5408\u306f\u3001\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u3064\u3051\u3066YAML\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-luxe-blocks-syntaxhighlighter line-numbers language-java\"><code class=\"language-java\">@JsonProperty(\"fieldNameForEmail\")\npublic String email;<\/code><\/pre>\n\n\n\n<p>\u4eca\u56de\u306e\u4f8b\u3067\u306f\u30d5\u30a3\u30fc\u30eb\u30c9\u3092public\u306b\u3057\u3066\u3044\u307e\u3059\u304c\u3001private\u306b\u3059\u308b\u5834\u5408\u306fgetter\u3068setter\u3092\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>\u4e00\u822c\u7684\u306b\u306f\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306fprivate\u306b\u3057\u3066\u304a\u3044\u3066\u3001\u305d\u308c\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306egetter\u3068setter\u306f\u5225\u9014\u7528\u610f\u3057\u307e\u3059\u3002<br>\u305f\u3060\u3001\u4eca\u56de\u306e\u4f8b\u306e\u3088\u3046\u306b\u5358\u7d14\u306b\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3057\u3066\u304a\u304f\u3060\u3051\u306e\u30af\u30e9\u30b9\u306a\u3089\u3001\u500b\u4eba\u7684\u306b\u306f\u30d5\u30a3\u30fc\u30eb\u30c9\u3092public\u306b\u3057\u3066\u304a\u3044\u305f\u65b9\u304c\u4fbf\u5229\u3060\u3057\u898b\u901a\u3057\u304c\u3044\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br>(\u7570\u8ad6\u306f\u8a8d\u3081\u307e\u3059)<\/p>\n\n\n\n<p>Java 16\u3067Record\u3068\u3044\u3046\u4ed5\u7d44\u307f\u304c\u5c0e\u5165\u3055\u308c\u3001\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3057\u3066\u304a\u304f\u3060\u3051\u306e\u30af\u30e9\u30b9\u3092\u7c21\u5358\u306b\u8a18\u8ff0\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<br>Jackson\u3067\u3082Record\u3092\u4f7f\u3048\u305d\u3046\u3067\u3059\u304c\u3001\u624b\u5143\u3067\u691c\u8a3c\u3067\u304d\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u3053\u3053\u3067\u306e\u8aac\u660e\u306f\u7701\u7565\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>YAML\u3084JSON\u306b\u542b\u307e\u308c\u308b\u30c7\u30fc\u30bf\u306e\u3046\u3061\u4e00\u90e8\u3060\u3051\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u30c7\u30fc\u30bf\u7528\u306e\u30af\u30e9\u30b9\u306f\u7528\u610f\u305b\u305a\u306bJsonNode\u3067\u30c7\u30fc\u30bf\u3092\u89e3\u6790\u3057\u3066\u3044\u304f\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-luxe-blocks-syntaxhighlighter line-numbers language-java\"><code class=\"language-java\">\/\/JsonNode\u3092\u7528\u3044\u305f\u8aad\u8fbc\u51e6\u7406\nJsonNode node = mapper.readTree(yaml);\nArrayNode usersNode = (ArrayNode) node;\nfor (int i = 0; i &lt; usersNode.size(); i++) {\n    JsonNode userNode = usersNode.get(i);\n    System.out.println(userNode.get(\"email\").asText());\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>2025-02-15\u8ffd\u8a18:record\u3092\u4f7f\u3063\u3066YAML\u306e\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\u3092\u8a18\u4e8b\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002\u3010Java\u3011Jackson\u3067YAML\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080(record\u4f7f\u7528) Java\u3067YAML\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092\u6271\u3046\u305f\u3081\u306e\u30e9\u30a4 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,16],"tags":[],"class_list":["post-889","post","type-post","status-publish","format-standard","hentry","category-java","category-16"],"_links":{"self":[{"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/posts\/889","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=889"}],"version-history":[{"count":7,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/posts\/889\/revisions"}],"predecessor-version":[{"id":1440,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=\/wp\/v2\/posts\/889\/revisions\/1440"}],"wp:attachment":[{"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=889"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=889"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/daba-no-heya.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=889"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}