Java?8中 java.util.Date 類新增了兩個方法，分別是from(Instant instant)和toInstant()方法

// Obtains an instance of Date from an Instant object. public static Date from(Instant instant) {try {return new Date(instant.toEpochMilli());} catch (ArithmeticException ex) {throw new IllegalArgumentException(ex);} }// Converts this Date object to an Instant. public Instant toInstant() {return Instant.ofEpochMilli(getTime()); }

這兩個方法使我們可以方便的實現將舊的日期類轉換為新的日期類，具體思路都是通過Instant當中介，然后通過Instant來創建LocalDateTime（這個類可以很容易獲取LocalDate和LocalTime），新的日期類轉舊的也是如此，將新的先轉成LocalDateTime，然后獲取Instant，接著轉成Date，具體實現細節如下：

// 01. java.util.Date --> java.time.LocalDateTime public void UDateToLocalDateTime() {java.util.Date date = new java.util.Date();Instant instant = date.toInstant();ZoneId zone = ZoneId.systemDefault();LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone); }// 02. java.util.Date --> java.time.LocalDate public void UDateToLocalDate() {java.util.Date date = new java.util.Date();Instant instant = date.toInstant();ZoneId zone = ZoneId.systemDefault();LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);LocalDate localDate = localDateTime.toLocalDate(); }// 03. java.util.Date --> java.time.LocalTime public void UDateToLocalTime() {java.util.Date date = new java.util.Date();Instant instant = date.toInstant();ZoneId zone = ZoneId.systemDefault();LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);LocalTime localTime = localDateTime.toLocalTime(); }// 04. java.time.LocalDateTime --> java.util.Date public void LocalDateTimeToUdate() {LocalDateTime localDateTime = LocalDateTime.now();ZoneId zone = ZoneId.systemDefault();Instant instant = localDateTime.atZone(zone).toInstant();java.util.Date date = Date.from(instant); }// 05. java.time.LocalDate --> java.util.Date public void LocalDateToUdate() {LocalDate localDate = LocalDate.now();ZoneId zone = ZoneId.systemDefault();Instant instant = localDate.atStartOfDay().atZone(zone).toInstant();java.util.Date date = Date.from(instant); }// 06. java.time.LocalTime --> java.util.Date public void LocalTimeToUdate() {LocalTime localTime = LocalTime.now();LocalDate localDate = LocalDate.now();LocalDateTime localDateTime = LocalDateTime.of(localDate, localTime);ZoneId zone = ZoneId.systemDefault();Instant instant = localDateTime.atZone(zone).toInstant();java.util.Date date = Date.from(instant); }

轉載自：https://www.cnblogs.com/exmyth/p/6425878.html

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