{"id":1237,"date":"2017-06-02T21:49:41","date_gmt":"2017-06-02T12:49:41","guid":{"rendered":"https:\/\/www.beeete2.com\/blog\/?p=1237"},"modified":"2018-12-29T06:45:17","modified_gmt":"2018-12-28T21:45:17","slug":"java%e3%81%aeyaml%e3%83%a9%e3%82%a4%e3%83%96%e3%83%a9%e3%83%aa%e3%81%aesnakeyaml%e3%82%92%e4%bd%bf%e3%81%86","status":"publish","type":"post","link":"https:\/\/www.beeete2.com\/blog\/?p=1237","title":{"rendered":"Java\u306eYAML\u30e9\u30a4\u30d6\u30e9\u30ea\u306eSnakeYaml\u3092\u4f7f\u3046"},"content":{"rendered":"

\u6700\u8fd1\u306f\u30d7\u30ed\u30d1\u30c6\u30a3\u30d5\u30a1\u30a4\u30eb\u3092\u66f8\u304f\u3068\u304d\u306b\u4eba\u9593\u304c\u8aad\u307f\u3084\u3059\u304f\u3066\u8a18\u8ff0\u91cf\u304c\u5c11\u306a\u3044\u3068\u3044\u3046\u7406\u7531\u3067YAML<\/code>\u3092\u3088\u304f\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002
\n\u30a4\u30f3\u30c7\u30f3\u30c8\u304c\u9055\u3046\u3068\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u898f\u7d04\u306e\u304a\u9670\u3067\u8a18\u8ff0\u91cf\u306e\u5c11\u306a\u3055\u3068\u8aad\u307f\u3084\u3059\u3055\u306b\u3064\u306a\u304c\u3063\u3066\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002
\nJava\u3067YAML\u3092\u8aad\u307f\u66f8\u304d\u3059\u308b\u305f\u3081\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u306fSpringBoot\u3067\u3082\u4f7f\u308f\u308c\u3066\u3044\u308bSnakeYaml\u304c\u6709\u540d\u3060\u3068\u601d\u3044\u307e\u3059\u3002
\nSpringBoot\u306f\u7279\u306b\u4f55\u3082\u3057\u306a\u304f\u3066\u3082\u30d7\u30ed\u30d1\u30c6\u30a3\u304b\u3089JavaObject\u3092\u4f5c\u3063\u3066\u304f\u308c\u308b\u306e\u3067SnakeYaml\u3092\u610f\u8b58\u3059\u308b\u3053\u3068\u306f\u3042\u3093\u307e\u308a\u306a\u3044\u306e\u3067\u3059\u304c\u3001\u4eca\u56de\u7d20\u3067\u89e6\u308b\u6a5f\u4f1a\u304c\u3042\u3063\u305f\u306e\u3067\u8272\u3005\u89e6\u3063\u3066\u307f\u307e\u3057\u305f\u3002
\n\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306fGitHub\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002
\nbeeete2\/snakeyaml-examples<\/a><\/p>\n

\u4eca\u56de\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30d5\u30a1\u30a4\u30eb\u3067\u8272\u3005\u8a66\u3057\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002
\n[python]
\nname: server1
\nhosts:
\n– hostid: ‘1’
\n name: host1
\n items:
\n – itemid: ‘1’
\n key: item1
\n startDate: 2017-05-01
\n endDate: 2017-05-31
\n – itemid: ‘2’
\n key: item2
\n startDate: 2017-05-01
\n endDate: 2017-05-31
\n[\/python]<\/p>\n

yaml\u30d5\u30a1\u30a4\u30eb\u3092\u30ed\u30fc\u30c9<\/h2>\n

yaml\u30d5\u30a1\u30a4\u30eb\u3092\u30ed\u30fc\u30c9\u3059\u308b\u3068\u304d\u306f\u975e\u5e38\u306b\u7c21\u5358\u3067\u3059\u3002
\n\u30ad\u30fc\u3068\u5024\u306e\u30da\u30a2\u306eMap\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002\u30ea\u30b9\u30c8\u578b\u306fList\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002
\n\u307e\u305f\u65e5\u4ed8\u306fDate<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3055\u308c\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n

[java]
\n String text = readDefaultText();<\/p>\n

Yaml yaml = new Yaml();
\n Map map = (Map) yaml.load(text);<\/p>\n

softly.assertThat(getString(map, "name")).isEqualTo("server1");<\/p>\n

List hosts = (List) map.get("hosts");
\n softly.assertThat(hosts).hasSize(1);<\/p>\n

Map host = (Map) hosts.get(0);
\n softly.assertThat(getString(host, "name")).isEqualTo("host1");<\/p>\n

List items = (List) host.get("items");
\n softly.assertThat(items).hasSize(2);
\n System.out.println(items);<\/p>\n

Map item = (Map) items.get(0);
\n softly.assertThat(getString(item, "key")).isEqualTo("item1");
\n softly.assertThat(item.get("startDate")).isInstanceOf(Date.class); \/\/ \u65e5\u4ed8\u306fDate\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306a\u308b
\n[\/java]<\/p>\n

yaml\u30d5\u30a1\u30a4\u30eb\u3092\u30ed\u30fc\u30c9\u3057\u4efb\u610f\u306e\u578b\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b<\/h2>\n

\u591a\u5206\u3001\u591a\u304f\u306e\u4f7f\u3044\u65b9\u304c\u3053\u306e\u4f7f\u3044\u65b9\u3060\u3068\u601d\u3044\u307e\u3059\u3002
\n\u4efb\u610f\u306e\u578b\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\n\u3053\u306e\u3068\u304d\u306b\u65e5\u4ed8\u3092LocalDateTime<\/code>\u578b\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n

\u4efb\u610f\u306e\u578b\u3092\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b\u3068\u304d\u306fConstructor<\/code>\u3092\u7d99\u627f\u3057\u305f\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u3066Yaml<\/code>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u6642\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u6307\u5b9a\u3057\u307e\u3059\u3002
\n[java]
\n \/\/ LocalDateTimePropertyConstructor
\n class LocalDateTimePropertyConstructor extends Constructor {
\n public LocalDateTimePropertyConstructor() {
\n yamlClassConstructors.put(NodeId.scalar, new TimeStampConstruct());
\n }<\/p>\n

class TimeStampConstruct extends Constructor.ConstructScalar {
\n @Override
\n public Object construct(Node node) {
\n if (node.getTag().equals(Tag.TIMESTAMP)) {
\n Construct dateConstructor = yamlConstructors.get(Tag.TIMESTAMP);
\n Date date = (Date) dateConstructor.construct(node);
\n LocalDateTime localDateTime = LocalDateTime.ofInstant(date.toInstant(), ZoneId.of("UTC"));
\n return localDateTime;
\n } else {
\n return super.construct(node);
\n }
\n }
\n }
\n }<\/p>\n

\/\/ Yaml\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u751f\u6210
\n Yaml yaml = new Yaml(new LocalDateTimePropertyConstructor());
\n[\/java]<\/p>\n

\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3067\u304d\u307e\u3059\u3002
\n[java]
\n String text = readDefaultText();<\/p>\n

Server server = main.loadAs(text, Server.class);
\n softly.assertThat(server.name).isEqualTo("server1");
\n softly.assertThat(server.hosts).hasSize(1);<\/p>\n

Host host = server.hosts.get(0);
\n softly.assertThat(host.name).isEqualTo("host1");
\n softly.assertThat(host.items).hasSize(2);<\/p>\n

Item item = host.items.get(0);
\n softly.assertThat(dateFormat(item.startDate)).isEqualTo("2017-05-01T00:00:00"); \/\/ LocalDateTime\u306b\u306a\u308b
\n softly.assertThat(dateFormat(item.endDate)).isEqualTo("2017-05-31T00:00:00");\/\/ LocalDateTime\u306b\u306a\u308b
\n[\/java]<\/p>\n

\u3082\u3061\u308d\u3093\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089yaml\u30d5\u30a1\u30a4\u30eb\u3078\u30c0\u30f3\u30d7\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u30c0\u30f3\u30d7<\/h2>\n

[java]
\n Server server = createServer();
\n Yaml yaml = new Yaml();
\n String text = yaml.dump(server);
\n softly.assertThat(text).isNotNull();
\n[\/java]<\/p>\n

\u3053\u3046\u306a\u308a\u307e\u3059\u3002
\n[python]
\n!!b3.snakeyaml.entities.Server
\nhosts:
\n– hostid: ‘1’
\n items:
\n – endDate: {}
\n itemid: ‘1’
\n key: item1
\n startDate: {}
\n – endDate: {}
\n itemid: ‘2’
\n key: item2
\n startDate: {}
\n name: host1
\nname: server1
\n[\/python]
\nLocalDateTime\u306e\u5024\u304c\u5909\u63db\u3067\u304d\u3066\u3044\u306a\u3044\u3088\u3046\u3067\u3059\u3002
\n\u5bfe\u8c61\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u30af\u30e9\u30b9\uff09\u306e\u5b8c\u5168\u4fee\u98fe\u540d\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002
\n\u3042\u3068\u3001\u3053\u308c\u306f\u597d\u307f\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a4\u30f3\u30c7\u30f3\u30c8\u304c\u306a\u3044\u306e\u304c\u5c11\u3057\u6c17\u306b\u306a\u308a\u307e\u3059\u3002
\n\u3067\u304d\u308c\u3070\u3001\u3053\u3046\u3057\u305f\u3044\u3002
\n[python]
\nhosts:
\n – hostid: ‘1’
\n items:
\n – endDate: 2016-05-31
\n itemid: ‘1’
\n key: item1
\n startDate: 2016-05-01
\n – endDate: 2016-05-31
\n itemid: ‘2’
\n key: item2
\n startDate: 2016-05-01
\n name: host1
\nname: server1
\n[\/python]<\/p>\n

\u66f8\u5f0f\u3068\u4efb\u610f\u306e\u578b\u3092\u5909\u63db\u3059\u308b<\/h2>\n

\u307e\u305a\u66f8\u5f0f\uff08\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff09\u306fDumperOptions<\/code>\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3057\u597d\u307f\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002
\n\u8272\u3005\u8a2d\u5b9a\u3067\u304d\u308b\u307f\u305f\u3044\u306a\u306e\u3067\u3059\u304c\u3001\u30a4\u30f3\u30c7\u30f3\u30c8\u3068\u30b9\u30bf\u30a4\u30eb\u306e\u8a2d\u5b9a\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002
\n[java]
\n DumperOptions options = new DumperOptions();
\n options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK); \/\/ \u30d6\u30ed\u30c3\u30af\u30b9\u30bf\u30a4\u30eb\u306b\u3059\u308b
\n options.setIndicatorIndent(2); \/\/ \u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u30a4\u30f3\u30c7\u30f3\u30c8\u30922\u306b\u8a2d\u5b9a\u3059\u308b
\n options.setIndent(4); \/\/ \u30a4\u30f3\u30c7\u30f3\u30c8\u30924\u306b\u8a2d\u5b9a\u3059\u308b
\n[\/java]<\/p>\n

\u4efb\u610f\u306e\u578b\u306e\u5909\u63db\u306fRepresenter<\/code>\u3092\u4f7f\u3063\u3066\u8a2d\u5b9a\u3057\u307e\u3059\u3002
\nLocalDateTime\u3092\u5909\u63db\u3059\u308b\u4f8b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002
\n[java]
\n class LocalDateTimeRepresenter extends Representer {<\/p>\n

public LocalDateTimeRepresenter() {
\n multiRepresenters.put(LocalDateTime.class, new RepresentLocalDateTime());
\n }<\/p>\n

private class RepresentLocalDateTime extends RepresentDate {
\n public Node representData(Object data) {
\n LocalDateTime localDateTime = (LocalDateTime) data;<\/p>\n

String date = localDateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
\n return representScalar(getTag(data.getClass(), Tag.TIMESTAMP), date, null);
\n }
\n }
\n }
\n[\/java]<\/p>\n

\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002
\n[java]
\n \/\/ LocalDateTime\u306e\u5909\u63db\u8a2d\u5b9a
\n Representer representer = new LocalDateTimeRepresenter();
\n representer.addClassTag(Server.class, Tag.MAP); \/\/ \u5b8c\u5168\u4fee\u98fe\u540d\u3092\u8868\u793a\u3057\u306a\u3044<\/p>\n

\/\/ \u66f8\u5f0f\u306e\u8a2d\u5b9a
\n DumperOptions options = new DumperOptions();
\n options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
\n options.setIndicatorIndent(2);
\n options.setIndent(8);<\/p>\n

Yaml yaml = new Yaml(representer, options);
\n return yaml.dump(object);
\n[\/java]
\n\u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002
\n[python]
\nhosts:
\n – hostid: ‘1’
\n items:
\n – endDate: 2016-05-31
\n itemid: ‘1’
\n key: item1
\n startDate: 2016-05-01
\n – endDate: 2016-05-31
\n itemid: ‘2’
\n key: item2
\n startDate: 2016-05-01
\n name: host1
\nname: server1
\n[\/python]<\/p>\n

\u307e\u3068\u3081<\/h2>\n

\u5927\u4f53\u671b\u3080\u3088\u3046\u306ayaml\u30d5\u30a1\u30a4\u30eb\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002
\n\u3042\u3068\u306f\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u4e26\u3073\u9806\u306e\u8abf\u6574\u304c\u51fa\u6765\u308c\u3070\u3088\u304b\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u305d\u3053\u307e\u3067\u306f\u5bfe\u5fdc\u3057\u307e\u305b\u3093\u3067\u3057\u305f\u3002
\n\u3061\u306a\u307f\u306b\u4e26\u3073\u9806\u306fJavaBeans\u306e\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u9806\u306b\u306a\u3063\u3066\u3044\u308b\u307f\u305f\u3044\u3067\u3059\u3002<\/p>\n

\ndefine order for JavaBean properties. Order may be very informative: for instance ID or name are normally expected to be the first. (Currently it is alphabetically sorted by default.)\n<\/div>\n

Dumping a custom YAML document<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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