1. 基于 JDK 8 time包的时间工具类

雨神相助
#bysocket

Author: JeffLi1993

src/org/javacore/time/TimeUtil.java

@@ -8,28 +8,15 @@
  * <p/>
  * Created by bysocket on 16/8/23.
  */
-public class TimeUtil {
+public final class TimeUtil {
 
-	/** 默认时间格式 */
-	private static final String SHORT_DATE_PATTERN_DEFAULT				= "yyyy-MM-dd";
-	private static final String LONG_DATE_PATTERN_DEFAULT				= "yyyy-MM-dd HH:mm:ss";
-	private static final String LONG_DATE_PATTERN_WITH_MILSEC_DEFAULT	= "yyyy-MM-dd HH:mm:ss.SSS";
-
-	/** 短时间格式  : 2016-08-25 */
-	private static final String[] SHORT_DATE_PATTERN 				= { "yyyy-MM-dd",
-																		"yyyy/MM/dd",
-																		"yyyy\\MM\\dd",
-																		"yyyyMMdd"};
-	/** 长时间格式  : 2016-08-25 20:28:46 */
-	private static final String[] LONG_DATE_PATTERN 				= {"yyyy-MM-dd HH:mm:ss",
-																		"yyyy/MM/dd HH:mm:ss",
-																		"yyyy\\MM\\dd HH:mm:ss",
-																		"yyyyMMddHHmmss"};
-	/** 长时间格式 ( 带毫秒 )  : 2016-08-25 20:34:48.956 */
-	private static final String[] LONG_DATE_PATTERN_WITH_MILSEC 	= { "yyyy-MM-dd HH:mm:ss.SSS",
-																		"yyyy/MM/dd HH:mm:ss.SSS",
-																		"yyyy\\MM\\dd HH:mm:ss.SSS",
-																		"yyyyMMddHHmmssSSS"};
+	private TimeUtil() {}
+
+	/** 时间间隔之间的空格 */
+	private static final String SPACE_OF_TIME = " ";
+
+	/** 获取默认时间格式: yyyy-MM-dd HH:mm:ss */
+	private static final DateTimeFormatter defaultDateTimeFormatter = DateTimeFormatter.ofPattern(TimeFormat.LONG_DATE_PATTERN_LINE);
 
 	/**
 	 * String 转时间
@@ -38,7 +25,7 @@ public class TimeUtil {
 	 * @return
 	 */
 	public final static LocalDateTime parseTime(String timeStr) {
-		LocalDateTime dateTime = LocalDateTime.parse(timeStr,getDefaultDateTimeFormatter());
+		LocalDateTime dateTime = LocalDateTime.parse(timeStr,defaultDateTimeFormatter);
 		return dateTime;
 	}
 
@@ -61,7 +48,7 @@ public final static LocalDateTime parseTime(String timeStr, String format) {
 	 * @return
 	 */
 	public final static String parseTime(LocalDateTime time) {
-		return getDefaultDateTimeFormatter().format(time);
+		return defaultDateTimeFormatter.format(time);
 	}
 
 	/**
@@ -81,8 +68,8 @@ public final static String parseTime(LocalDateTime time, String format) {
 	 * @return
 	 */
 	public final static String getCurrentDatetime() {
-		LocalDateTime now = LocalDateTime.now();
-		return getDefaultDateTimeFormatter().format(now);
+		LocalDateTime now = LocalDateTime.now().withNano(0);
+		return now.toLocalDate() + SPACE_OF_TIME + now.toLocalTime();
 	}
 
 	/**
@@ -96,15 +83,6 @@ public final static String getCurrentDatetime(String format) {
 		return getDateTimeFormatter(format).format(now);
 	}
 
-	/**
-	 * 获取默认时间格式
-	 *
-	 * @return
-	 */
-	private final static DateTimeFormatter getDefaultDateTimeFormatter() {
-		return DateTimeFormatter.ofPattern(LONG_DATE_PATTERN_DEFAULT);
-	}
-
 	/**
 	 * 获取时间格式
 	 *
@@ -117,22 +95,41 @@ private final static DateTimeFormatter getDateTimeFormatter(String format) {
 
 	public static void main(String[] args) {
 		// 当前时间
-		System.out.println(getCurrentDatetime(SHORT_DATE_PATTERN_DEFAULT));
+		System.out.println(getCurrentDatetime(TimeFormat.SHORT_DATE_PATTERN_LINE));
 		System.out.println(getCurrentDatetime());
-		System.out.println(getCurrentDatetime(LONG_DATE_PATTERN_WITH_MILSEC_DEFAULT));
+		System.out.println(getCurrentDatetime(TimeFormat.LONG_DATE_PATTERN_WITH_MILSEC_LINE));
 
 		// 时间转 String
 		LocalDateTime dateTime = LocalDateTime.now();
 		System.out.println(parseTime(dateTime));
 
 		LocalDateTime dateTime1 = LocalDateTime.of(2016,8,25,23,10,10);
-		System.out.println(parseTime(dateTime1,LONG_DATE_PATTERN_DEFAULT));
+		System.out.println(parseTime(dateTime1,TimeFormat.LONG_DATE_PATTERN_LINE));
 
 		// String 转时间
 		String dateTimeStr = "2016-08-25 23:10:10";
 		System.out.println(parseTime(dateTimeStr));
 
 		String dateTimeStr1 = "2016-08-25 23:10:10";
-		System.out.println(parseTime(dateTimeStr1,LONG_DATE_PATTERN_DEFAULT));
+		System.out.println(parseTime(dateTimeStr1,TimeFormat.LONG_DATE_PATTERN_LINE));
 	}
 }
+
+class TimeFormat {
+
+	/** 默认时间格式 */
+	public static final String SHORT_DATE_PATTERN_LINE				= "yyyy-MM-dd";
+	public static final String SHORT_DATE_PATTERN_SLASH				= "yyyy/MM/dd";
+	public static final String SHORT_DATE_PATTERN_DOUBLE_SLASH		= "yyyy\\MM\\dd";
+	public static final String SHORT_DATE_PATTERN_NONE 				= "yyyyMMdd";
+
+	public static final String LONG_DATE_PATTERN_LINE				= "yyyy-MM-dd HH:mm:ss";
+	public static final String LONG_DATE_PATTERN_SLASH				= "yyyy/MM/dd HH:mm:ss";
+	public static final String LONG_DATE_PATTERN_DOUBLE_SLASH		= "yyyy\\MM\\dd HH:mm:ss";
+	public static final String LONG_DATE_PATTERN_NONE 				= "yyyyMMdd HH:mm:ss";
+
+	public static final String LONG_DATE_PATTERN_WITH_MILSEC_LINE				= "yyyy-MM-dd HH:mm:ss.SSS";
+	public static final String LONG_DATE_PATTERN_WITH_MILSEC_SLASH				= "yyyy/MM/dd HH:mm:ss.SSS";
+	public static final String LONG_DATE_PATTERN_WITH_MILSEC_DOUBLE_SLASH		= "yyyy\\MM\\dd HH:mm:ss.SSS";
+	public static final String LONG_DATE_PATTERN_WITH_MILSEC_NONE 				= "yyyyMMdd HH:mm:ss.SSS";
+}