{"id":13301,"date":"2016-12-18T09:00:41","date_gmt":"2016-12-18T00:00:41","guid":{"rendered":"http:\/\/www.techscore.com\/blog\/?p=13301"},"modified":"2018-11-14T16:33:43","modified_gmt":"2018-11-14T07:33:43","slug":"java-jackson-serialize-deserialize","status":"publish","type":"post","link":"https:\/\/www.techscore.com\/blog\/2016\/12\/18\/java-jackson-serialize-deserialize\/","title":{"rendered":"Java : Jackson : \u3061\u3087\u3063\u3068\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u306b\u304a\u3051\u308bJSON\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff0f\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba"},"content":{"rendered":"

\u3053\u3093\u306b\u3061\u306f\u3002\u677e\u672c\u3067\u3059\u3002
\n\u3053\u306e\u8a18\u4e8b\u306f TECHSCORE Advent Calendar 2016<\/a> \u306e 18 \u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n

6 \u6708\u9803\u306b\u66f8\u3044\u305f\u8a18\u4e8b\uff08\u300cJava : Jackson \u306b\u3088\u308b JSON \u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u6642\u306e\u578b\u89e3\u6c7a\u65b9\u6cd5<\/a>\u300d\uff09\u306b\u7d9a\u3044\u3066\u307e\u305f Jackson \u30cd\u30bf\u3067\u3059\u3002<\/p>\n

\u3053\u3053\u6570\u5e74\u3001REST \u30b5\u30fc\u30d3\u30b9\u306e\u958b\u767a\u3084 NoSQL \u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30b9\u30c8\u30ec\u30fc\u30b8\u5229\u7528\u306b\u3088\u3063\u3066\u3001\u30c7\u30fc\u30bf\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u306b JSON \u3092\u4f7f\u3046\u3053\u3068\u304c\u591a\u304f\u306a\u308a\u307e\u3057\u305f\u3002\u305d\u306e\u5206\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5185\u3067\u6271\u3046\u30e2\u30c7\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068 JSON \u306e\u30de\u30c3\u30d4\u30f3\u30b0\u3067\u82e6\u52b4\u3059\u308b\u3053\u3068\u3082\u591a\u304f\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n

Jackson<\/a> \u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068 JSON \u306e\u30de\u30c3\u30d4\u30f3\u30b0\u65b9\u6cd5\u304c\u67d4\u8edf\u3067\u591a\u6a5f\u80fd\u306a\u306e\u3067\u3059\u304c\u3001\u610f\u5916\u3068\u77e5\u3089\u308c\u3066\u3044\u306a\u3044\u6a5f\u80fd\u3082\u3042\u308b\u306e\u3067\u3001\u305d\u3046\u3044\u3063\u305f\u3082\u306e\u3092\u30d4\u30c3\u30af\u30a2\u30c3\u30d7\u3057\u3066\u8a18\u4e8b\u306b\u3057\u3088\u3046\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n

@JsonAnyGetter<\/h2>\n

@JsonAnyGetter \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3046\u3053\u3068\u3067 Map \u578b\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u30a8\u30f3\u30c8\u30ea\u3092\u30d5\u30e9\u30c3\u30c8\u306b\u4e26\u3079\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u901a\u5e38\u3001\u3053\u3093\u306a\u30af\u30e9\u30b9\u3092\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3059\u308b\u3068 extensions \u30d7\u30ed\u30d1\u30c6\u30a3\u304c object \u578b\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u3057\u3066\u8868\u73fe\u3055\u308c\u307e\u3059\u3002<\/p>\n

\r\npublic class Bean1 {\r\n\r\n    private String name;\r\n\r\n    private Map extensions = new HashMap<>();\r\n\r\n    public String getName() {\r\n        return name;\r\n    }\r\n\r\n    public void setName(String name) {\r\n        this.name = name;\r\n    }\r\n\r\n    public Map getExtensions() {\r\n        return extensions;\r\n    }\r\n\r\n    public void setExtensions(Map extensions) {\r\n        this.extensions = extensions;\r\n    }\r\n\r\n}\r\n<\/pre>\n
\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
\r\nBean1 bean1 = new Bean1();\r\nbean1.setName(\"bean\");\r\nbean1.getExtensions().put(\"key1\", \"value1\");\r\nbean1.getExtensions().put(\"key2\", \"value2\");\r\n\r\nObjectMapper objectMapper = new ObjectMapper().enable(SerializationFeature.INDENT_OUTPUT);\r\nString json = objectMapper.writeValueAsString(bean1);\r\nSystem.out.println(json);\r\n<\/pre>\n
\r\n{\r\n  \"name\" : \"bean\",\r\n  \"extensions\" : {\r\n    \"key1\" : \"value1\",\r\n    \"key2\" : \"value2\"\r\n  }\r\n}\r\n<\/pre>\n
\u30af\u30e9\u30b9\u5b9a\u7fa9\u901a\u308a\u3001JSON \u4e0a\u3067\u3082 extensions \u30d7\u30ed\u30d1\u30c6\u30a3\u4ee5\u4e0b\u306b key1, key2 \u304c\u4e26\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n
extensions \u30d7\u30ed\u30d1\u30c6\u30a3\u306e Getter \u306b @JsonAnyGetter \u3092\u4ed8\u3051\u3066\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3059\u308b\u3068\u7d50\u679c\u304c\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n
\r\n    @JsonAnyGetter\r\n    public Map getExtensions() {\r\n        return extensions;\r\n    }\r\n<\/pre>\n
\r\n{\r\n  \"name\" : \"bean\",\r\n  \"key1\" : \"value1\",\r\n  \"key2\" : \"value2\"\r\n}\r\n<\/pre>\n
\u5148\u307b\u3069\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u7d50\u679c\u3067\u306f extensions \u30d7\u30ed\u30d1\u30c6\u30a3\u4ee5\u4e0b\u306b\u51fa\u529b\u3055\u308c\u305f key1, key2 \u304c\u3001name \u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u540c\u30ec\u30d9\u30eb\u3067\u5c55\u958b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u306a\u304a\u3001@JsonAnyGetter \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f Map \u578b\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u3057\u304b\u4f7f\u3048\u305a\u3001\u3072\u3068\u3064\u306e\u30af\u30e9\u30b9\u306b\u8907\u6570\u306e @JsonAnyGetter \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u3064\u3051\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n
@JsonAnySetter<\/h2>\n
\u5b9f\u306f\u4e0a\u8a18\u306e\u3088\u3046\u306b @JsonAnyGetter \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u3051\u305f\u30af\u30e9\u30b9\u306f\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u306b\u5931\u6557\u3057\u307e\u3059\u3002<\/p>\n
\r\nBean1 result = objectMapper.readValue(json, Bean1.class);\r\n<\/pre>\n
\r\nException in thread \"main\" com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field \"key1\" (class Bean1), not marked as ignorable (2 known properties: \"name\", \"extensions\"])\r\n at [Source: {\r\n  \"name\" : \"bean\",\r\n  \"key1\" : \"value1\",\r\n  \"key2\" : \"value2\"\r\n}; line: 3, column: 13] (through reference chain: Bean1[\"key1\"])\r\n<\/pre>\n
Bean1 \u30af\u30e9\u30b9\u306b\u306f key1 \u3084 key2 \u3068\u3044\u3046\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u5b58\u5728\u3057\u306a\u3044\u306e\u3067\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3067\u304d\u306a\u3044\u306e\u3067\u3059\u3002\u305d\u3053\u3067 @JsonAnySetter \u306e\u767b\u5834\u3067\u3059\u3002<\/p>\n
\u4e0b\u8a18\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u540d\u3068\u5024\u3092\u53d7\u3051\u53d6\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\u3057\u3001@JsonAnySetter \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u3051\u307e\u3059\u3002<\/p>\n
\r\n    @JsonAnySetter\r\n    public void setExtension(String key, String value) {\r\n        this.extensions.put(key, value);\r\n    }\r\n<\/pre>\n
\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u5b58\u5728\u3057\u306a\u3044\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u5168\u3066 @JsonAnySetter \u304c\u4ed8\u3044\u305f\u30e1\u30bd\u30c3\u30c9\u306b\u6e21\u3055\u308c\u3001\u51e6\u7406\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
@JsonView<\/h2>\n
@JsonView \u3092\u4f7f\u3046\u3053\u3068\u3067\u30d3\u30e5\u30fc\uff08JSON \u306b\u51fa\u529b\u3059\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u30b5\u30d6\u30bb\u30c3\u30c8\uff09\u306e\u5b9a\u7fa9\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u307e\u305a\u306f\u30d3\u30e5\u30fc\u306e\u5b9a\u7fa9\u3002<\/p>\n
\r\npublic class Views {\r\n\r\n    public class GroupA {}\r\n\r\n    public class GroupB extends GroupA {}\r\n\r\n    public class GroupC {}\r\n\r\n}\r\n<\/pre>\n
\u30d3\u30e5\u30fc\u3092\u8868\u3059 3 \u3064\u306e\u30af\u30e9\u30b9\u3001GroupA, GroupB, GroupC \u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002GroupB \u306f GroupA \u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3066\u3044\u308b\u70b9\u304c\u672c\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306e\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002<\/p>\n
\u3053\u308c\u3089\u3092\u4f7f\u3063\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u30b5\u30d6\u30bb\u30c3\u30c8\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n
\r\npublic class Bean2 {\r\n\r\n    private String name;\r\n\r\n    private String type;\r\n\r\n    private String value;\r\n\r\n    private String description;\r\n\r\n    @JsonView(Views.GroupA.class)\r\n    public String getName() {\r\n        return name;\r\n    }\r\n\r\n    public void setName(String name) {\r\n        this.name = name;\r\n    }\r\n\r\n    @JsonView(Views.GroupB.class)\r\n    public String getType() {\r\n        return type;\r\n    }\r\n\r\n    public void setType(String type) {\r\n        this.type = type;\r\n    }\r\n\r\n    public String getValue() {\r\n        return value;\r\n    }\r\n\r\n    public void setValue(String value) {\r\n        this.value = value;\r\n    }\r\n\r\n    @JsonView(Views.GroupC.class)\r\n    public String getDescription() {\r\n        return description;\r\n    }\r\n\r\n    public void setDescription(String description) {\r\n        this.description = description;\r\n    }\r\n\r\n}\r\n<\/pre>\n
Bean2 \u30af\u30e9\u30b9\u304c\u6301\u3064 4 \u3064\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u3046\u3061\u3001name, type, description \u306e 3 \u3064\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b @JsonView \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u3051\u307e\u3057\u305f\u3002@JsonView \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306b\u30d3\u30e5\u30fc\u3092\u8868\u3059\u30af\u30e9\u30b9\u3092\u4e0e\u3048\u308b\u3053\u3068\u3067\u3001\u5bfe\u8c61\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u30d3\u30e5\u30fc\u306e\u30e1\u30f3\u30d0\u30fc\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3057\u3066\u307f\u307e\u3059\u3002\u307e\u305a\u306f\u30d3\u30e5\u30fc\u3092\u6307\u5b9a\u3057\u306a\u3044\u30b1\u30fc\u30b9\u3002<\/p>\n
\r\nBean2 bean2 = new Bean2();\r\nbean2.setName(\"bean2\");\r\nbean2.setType(\"String\");\r\nbean2.setValue(\"ABCDEFG\");\r\nbean2.setDescription(\"hello\");\r\n\r\nObjectMapper objectMapper = new ObjectMapper().enable(SerializationFeature.INDENT_OUTPUT);\r\nString json1 = objectMapper.writeValueAsString(bean2);\r\nSystem.out.println(json1);\r\n<\/pre>\n
\r\n{\r\n  \"name\" : \"bean2\",\r\n  \"type\" : \"String\",\r\n  \"value\" : \"ABCDEFG\",\r\n  \"description\" : \"hello\"\r\n}\r\n<\/pre>\n
\u671f\u5f85\u901a\u308a 4 \u3064\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3059\u3079\u3066\u304c\u51fa\u529b\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
\u6b21\u306f GroupA \u3092\u6307\u5b9a\u3057\u3066\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3002<\/p>\n
\r\nString json2 = objectMapper.writerWithView(Views.GroupA.class).writeValueAsString(bean2);\r\nSystem.out.println(json2);\r\n<\/pre>\n
\r\n{\r\n  \"name\" : \"bean2\",\r\n  \"value\" : \"ABCDEFG\"\r\n}\r\n<\/pre>\n
@JsonView \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067 GroupA \u3092\u6307\u5b9a\u3057\u305f name \u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u3001@JsonView \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u3064\u3051\u306a\u304b\u3063\u305f value \u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u51fa\u529b\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
\u6700\u5f8c\u306b GroupB \u3092\u6307\u5b9a\u3057\u3066\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3057\u307e\u3059\u3002<\/p>\n
\r\nString json3 = objectMapper.writerWithView(Views.GroupB.class).writeValueAsString(bean2);\r\nSystem.out.println(json3);\r\n<\/pre>\n
\r\n{\r\n  \"name\" : \"bean2\",\r\n  \"type\" : \"String\",\r\n  \"value\" : \"ABCDEFG\"\r\n}\r\n<\/pre>\n
\u30d3\u30e5\u30fc GroupB \u306b\u542b\u307e\u308c\u308b\u30d7\u30ed\u30d1\u30c6\u30a3 type \u3068\u3001@JsonView \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u3064\u3051\u306a\u304b\u3063\u305f value \u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u52a0\u3048\u3001GroupA \u306b\u542b\u307e\u308c\u308b\u30d7\u30ed\u30d1\u30c6\u30a3 name \u3082\u51fa\u529b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001GroupB \u304c GroupA \u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3067\u3042\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n
\u307e\u3068\u3081<\/h2>\n
JavaBeans \u306e\u300c\u30d7\u30ed\u30d1\u30c6\u30a3\u300d\u306b\u5bfe\u5fdc\u3059\u308b JSON \u306e\u7528\u8a9e\u306f\u4f55\u306a\u306e\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f\u30ad\u30e3\u30c3\u30c1\u30fc\u306b\u300c\u30d7\u30ed\u30d1\u30c6\u30a3\u300d\u3068\u66f8\u3044\u3066\u306f\u307f\u307e\u3057\u305f\u304c\u3001RFC \u306e 4.  Objects<\/a> \u3092\u898b\u308b\u3068\u3053\u3046\u66f8\u304b\u308c\u3066\u3044\u308b\u306e\u3067\u300c\u30e1\u30f3\u30d0\u30fc\u300d\u3067\u3044\u3044\u306e\u304b\u306a\u3002<\/p>\n
An object structure is represented as a pair of curly brackets
\n   surrounding zero or more name\/value pairs (or members).<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"
\u3053\u3093\u306b\u3061\u306f\u3002\u677e\u672c\u3067\u3059\u3002
\n\u3053\u306e\u8a18\u4e8b\u306f TECHSCORE Advent Calendar 2016 \u306e 18 \u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n
6 \u6708\u9803\u306b\u66f8\u3044\u305f\u8a18\u4e8b\uff08\u300cJava : Jackson \u306b\u3088\u308b JSON \u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u6642\u306e\u578b\u89e3\u6c7a\u65b9\u6cd5\u300d\uff09\u306b\u7d9a\u3044\u3066\u307e\u305f Jackson \u30cd\u30bf\u3067\u3059\u3002
\u7d9a\u304d\u3092\u8aad\u3080...<\/a><\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[239,18],"tags":[141,57,175],"_links":{"self":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/13301"}],"collection":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/users\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/comments?post=13301"}],"version-history":[{"count":27,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/13301\/revisions"}],"predecessor-version":[{"id":13419,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/13301\/revisions\/13419"}],"wp:attachment":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/media?parent=13301"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/categories?post=13301"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/tags?post=13301"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}