zhuhjay
22e48d9558
- 新增 .drone.yml 文件用于定义 CI/CD 流程 - 配置了基于 Docker 的部署步骤 - 设置了工作区和卷映射以支持持久化数据 - 添加了构建准备阶段和 Docker 部署阶段 - 定义了环境变量和代理设置 - 配置了 artifacts 目录的处理逻辑 - 添加了 timezone 映射以确保时间同步 - 设置了 docker.sock 映射以支持 Docker in Docker
1 line
137 KiB
JavaScript
1 line
137 KiB
JavaScript
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2 新的日期时间API")]),s._v(" "),t("ul",[t("li",[s._v("旧版日期时间API存在的问题\n"),t("ol",[t("li",[s._v("设计很差：在"),t("code",[s._v("java.util")]),s._v("和"),t("code",[s._v("java.sql")]),s._v("的包中都有日期类，"),t("code",[s._v("java.util.Date")]),s._v("同时包含日期和时间，而"),t("code",[s._v("java.sql.Date")]),s._v("仅包含日期。此外用于格式化和解析的类在"),t("code",[s._v("java.text")]),s._v("包中定义。")]),s._v(" "),t("li",[s._v("非线程安全："),t("code",[s._v("java.util.Date")]),s._v("是非线程安全的，所有的日期类都是可变的，这是Java日期类最大的问题之一。")]),s._v(" "),t("li",[s._v("时区处理麻烦：日期类并不提供国际化，没有时区支持，因此Java引入了"),t("code",[s._v("java.util.Calendar")]),s._v("和 "),t("code",[s._v("java.util.TimeZone")]),s._v("类，但他们同样存在上述所有的问题。")])])])]),s._v(" "),t("h3",{attrs:{id:"_2-1-新的日期时间api介绍"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#_2-1-新的日期时间api介绍"}},[s._v("#")]),s._v(" 2.1 新的日期时间API介绍")]),s._v(" "),t("ul",[t("li",[t("p",[s._v("JDK 8中增加了一套全新的日期时间API，这套API设计合理，是线程安全的。新的日期及时间API位于 "),t("code",[s._v("java.time")]),s._v("包中，下面是一些关键类。")]),s._v(" "),t("ul",[t("li",[s._v("LocalDate ：表示日期，包含年月日，格式为 2019-10-16")]),s._v(" "),t("li",[s._v("LocalTime ：表示时间，包含时分秒，格式为 16:38:54.158549300")]),s._v(" "),t("li",[s._v("LocalDateTime ：表示日期时间，包含年月日，时分秒，格式为 2018-09-06T15:33:56.750")]),s._v(" "),t("li",[s._v("DateTimeFormatter ：日期时间格式化类。")]),s._v(" "),t("li",[s._v("Instant：时间戳，表示一个特定的时间瞬间。")]),s._v(" "),t("li",[s._v("Duration：用于计算2个时间(LocalTime，时分秒)的距离")]),s._v(" "),t("li",[s._v("Period：用于计算2个日期(LocalDate，年月日)的距离")]),s._v(" "),t("li",[s._v("ZonedDateTime ：包含时区的时间")])])]),s._v(" "),t("li",[t("p",[s._v("Java中使用的历法是ISO 8601日历系统，它是世界民用历法，也就是我们所说的公历。平年有365天，闰年是366天。此外Java 8还提供了4套其他历法，分别是：")]),s._v(" "),t("ul",[t("li",[s._v("ThaiBuddhistDate：泰国佛教历")]),s._v(" "),t("li",[s._v("MinguoDate：中华民国历")]),s._v(" "),t("li",[s._v("JapaneseDate：日本历")]),s._v(" "),t("li",[s._v("HijrahDate：伊斯兰历")])])])]),s._v(" "),t("h3",{attrs:{id:"_2-2-日期时间类"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#_2-2-日期时间类"}},[s._v("#")]),s._v(" 2.2 日期时间类")]),s._v(" 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now"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("getMinute")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 分: 47")]),s._v("\n "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("System")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("out"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("println")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v('"秒: "')]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+")]),s._v(" now"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("getSecond")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 秒: 29")]),s._v("\n "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("System")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("out"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("println")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v('"纳秒: "')]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+")]),s._v(" 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"),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br"),t("span",{staticClass:"line-number"},[s._v("14")]),t("br"),t("span",{staticClass:"line-number"},[s._v("15")]),t("br"),t("span",{staticClass:"line-number"},[s._v("16")]),t("br"),t("span",{staticClass:"line-number"},[s._v("17")]),t("br"),t("span",{staticClass:"line-number"},[s._v("18")]),t("br"),t("span",{staticClass:"line-number"},[s._v("19")]),t("br")])]),t("ul",[t("li",[s._v("对日期时间的修改，对已存在的LocalDate对象，创建它的修改版，最简单的方式是使用withAttribute方法。 withAttribute方法会创建对象的一个副本，并按照需要修改它的属性。以下所有的方法都返回了一个修改属性的对象，他们不会影响原来的对象。")])]),s._v(" "),t("div",{staticClass:"language-java line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-java"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("public")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("class")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("DateTest")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n "),t("span",{pre:!0,attrs:{class:"token annotation punctuation"}},[s._v("@Test")]),s._v("\n "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("public")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("void")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("localDateTimeUpdate")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token 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"),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br"),t("span",{staticClass:"line-number"},[s._v("14")]),t("br")])]),t("h3",{attrs:{id:"_2-7-设置日期时间的时区"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#_2-7-设置日期时间的时区"}},[s._v("#")]),s._v(" 2.7 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