java时间操作函数汇总
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常用到时间日期类,所以就将常用的日期方法和属性都归纳总结如下,方便大家查找
1.计算某一月份的最大天数
Calendar time=Calendar.getInstance();
time.clear();
time.set(Calendar.YEAR,year);
time.set(Calendar.MONTH,i-1);//注意,Calendar对象默认一月为0
int day=time.getActualMaximum(Calendar.DAY_OF_MONTH);//本月份的天数
注:在使用set方法之前,最好先clear一下,否则很多信息会继承自系统当前时间
2.Calendar和Date的转化
(1) Calendar转化为Date
Calendar cal=Calendar.getInstance();
Date date=cal.getTime();
(2) Date转化为Calendar
Date date=new Date();
Calendar cal=Calendar.getInstance();
cal.setTime(date);
3.格式化输出日期时间
Date date=new Date();
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
System.out.println(df.format(date));
4.计算一年中的第几星期
(1)计算某一天是一年中的第几星期
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 9);
cal.set(Calendar.DAY_OF_MONTH, 3);
int weekno=cal.get(Calendar.WEEK_OF_YEAR);
(2)计算一年中的第几星期是几号
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.WEEK_OF_YEAR, 1);
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
System.out.println(df.format(cal.getTime()));
输出:
2006-01-02
5.add()和roll()的用法
(1)add()方法
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 9);
cal.set(Calendar.DAY_OF_MONTH, 3);
cal.add(Calendar.DATE, -4);
Date date=cal.getTime();
System.out.println(df.format(date));
cal.add(Calendar.DATE, 4);
date=cal.getTime();
System.out.println(df.format(date));
输出:
2006-08-30
2006-10-03
(2)roll方法
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 9);
cal.set(Calendar.DAY_OF_MONTH, 3);
cal.roll(Calendar.DATE, -4);
date=cal.getTime();
System.out.println(df.format(date));
cal.roll(Calendar.DATE, 4);
date=cal.getTime();
System.out.println(df.format(date));
输出:
2006-10-29
2006-10-03
可见,roll()方法在本月内循环,一般使用add()方法;
6.计算两个任意时间中间的间隔天数
(1)传进Calendar对象
/** *//**计算两个时间之间相隔天数
* @param startday 开始时间
* @param endday 结束时间
* @return
*/
public int getIntervalDays(Calendar startday,Calendar endday)...{
//确保startday在endday之前
if(startday.after(endday))...{
Calendar cal=startday;
startday=endday;
endday=cal;
}
//分别得到两个时间的毫秒数
long sl=startday.getTimeInMillis();
long el=endday.getTimeInMillis();
long ei=el-sl;
//根据毫秒数计算间隔天数
return (int)(ei/(1000*60*60*24));
}
(2)传进Date对象
/** *//**计算两个时间之间相隔天数
* @param startday 开始时间
* @param endday 结束时间
* @return
*/
public int getIntervalDays(Date startday,Date endday)...{
//确保startday在endday之前
if(startday.after(endday))...{
Date cal=startday;
startday=endday;
endday=cal;
}
//分别得到两个时间的毫秒数
long sl=startday.getTime();
long el=endday.getTime();
long ei=el-sl;
//根据毫秒数计算间隔天数
return (int)(ei/(1000*60*60*24));
}同理,可以用相同的方法计算出任意两个时间相隔的小时数,分钟数,秒钟数等
注:以上方法是完全按时间计算,有时并不能令人满意,如:
startday="2006-10-11 20:00:00"
endday="2006-10-12 8:00:00"
计算结果为0,但是我们也许相让计算结果变为1,此时可以用如下方法实现:
在传参之前,先设定endday的时间,如:
endday.set(Calendar.HOUR_OF_DAY, 23);
endday.set(Calendar.MINUTE, 59);
endday.set(Calendar.SECOND, 59);
endday.set(Calendar.MILLISECOND, 59);
这样再传进去startday,endday,则结果就如我们所愿了。不过,如果嫌以上方法麻烦,可以参考以下方法:
(3)改进精确计算相隔天数的方法
public int getDaysBetween (Calendar d1, Calendar d2) ...{
if (d1.after(d2)) ...{ // swap dates so that d1 is start and d2 is end
java.util.Calendar swap = d1;
d1 = d2;
d2 = swap;
}
int days = d2.get(Calendar.DAY_OF_YEAR) - d1.get(Calendar.DAY_OF_YEAR);
int y2 = d2.get(Calendar.YEAR);
if (d1.get(Calendar.YEAR) != y2) ...{
d1 = (Calendar) d1.clone();
do ...{
days += d1.getActualMaximum(Calendar.DAY_OF_YEAR);//得到当年的实际天数
d1.add(Calendar.YEAR, 1);
} while (d1.get(Calendar.YEAR) != y2);
}
return days;
}
获取系统当前时间:
public static String getSystemTime(){
Date date=new Date();
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return df.format(date);
}
//字符串转化成时间类型(字符串可以是任意类型,只要和SimpleDateFormat中的格式一致即可)
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("M/dd/yyyy hh:mm:ss a",java.util.Locale.US);
java.util.Date d = sdf.parse("5/13/2003 10:31:37 AM");
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String mDateTime1=formatter.format(d);
//当前时间
Calendar cal = Calendar.getInstance();
// SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss G E D F w W a E F");
String mDateTime=formatter.format(cal.getTime());
//1年前日期
java.util.Date myDate=new java.util.Date();
long myTime=(myDate.getTime()/1000)-60*60*24*365;
myDate.setTime(myTime*1000);
String mDate=formatter.format(myDate);
//明天日期
myDate=new java.util.Date();
myTime=(myDate.getTime()/1000)+60*60*24;
myDate.setTime(myTime*1000);
mDate=formatter.format(myDate);
//两个时间之间的天数
SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
java.util.Date date= myFormatter.parse("2003-05-1");
java.util.Date mydate= myFormatter.parse("1899-12-30");
long day=(date.getTime()-mydate.getTime())/(24*60*60*1000);
//加半小时
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
java.util.Date date1 = format.parse("2002-02-28 23:16:00");
long Time=(date1.getTime()/1000)+60*30;
date1.setTime(Time*1000);
String mydate1=formatter.format(date1);
//年月周求日期
SimpleDateFormat formatter2 = new SimpleDateFormat("yyyy-MM F E");
java.util.Date date2= formatter2.parse("2003-05 5 星期五");
SimpleDateFormat formatter3 = new SimpleDateFormat("yyyy-MM-dd");
String mydate2=formatter3.format(date2);
//求是星期几
mydate= myFormatter.parse("2001-1-1");
SimpleDateFormat formatter4 = new SimpleDateFormat("E");
String mydate3=formatter4.format(mydate);
在 开发web应用中,针对不同的数据库日期类型,我们需要在我们的程序中对日期类型做各种不同的转换。若对应数据库数据是oracle的Date类型,即只 需要年月日的,可以选择使用java.sql.Date类型,若对应的是MSsqlserver数据库的DateTime类型,即需要年月日时分秒的,选 择java.sql.Timestamp类型
你可以使用dateFormat定义时间日期的格式,转一个字符串即可
package personal.jessica;
import java.util.Date;
import java.util.Calendar;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Locale;
class Datetest{
/**
*method 将字符串类型的日期转换为一个timestamp(时间戳记java.sql.Timestamp)
*@param dateString 需要转换为timestamp的字符串
*@return dataTime timestamp
*/
public final static java.sql.Timestamp string2Time(String dateString)
throws java.text.ParseException {
DateFormat dateFormat;
dateFormat = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss.SSS", Locale.ENGLISH);//设定格式
//dateFormat = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss", Locale.ENGLISH);
dateFormat.setLenient(false);
java.util.Date timeDate = dateFormat.parse(dateString);//util类型
java.sql.Timestamp dateTime = new java.sql.Timestamp(timeDate.getTime());//Timestamp类型,timeDate.getTime()返回一个long型
return dateTime;
}
/**
*method 将字符串类型的日期转换为一个Date(java.sql.Date)
*@param dateString 需要转换为Date的字符串
*@return dataTime Date
*/
public final static java.sql.Date string2Date(String dateString)
throws java.lang.Exception {
DateFormat dateFormat;
dateFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH);
dateFormat.setLenient(false);
java.util.Date timeDate = dateFormat.parse(dateString);//util类型
java.sql.Date dateTime = new java.sql.Date(timeDate.getTime());//sql类型
return dateTime;
}
public static void main(String[] args){
Date da = new Date();
//注意:这个地方da.getTime()得到的是一个long型的值
System.out.println(da.getTime());
//由日期date转换为timestamp
//第一种方法:使用new Timestamp(long)
Timestamp t = new Timestamp(new Date().getTime());
System.out.println(t);
//第二种方法:使用Timestamp(int year,int month,int date,int hour,int minute,int second,int nano)
Timestamp tt = new Timestamp(Calendar.getInstance().get(
Calendar.YEAR) - 1900, Calendar.getInstance().get(
Calendar.MONTH), Calendar.getInstance().get(
Calendar.DATE), Calendar.getInstance().get(
Calendar.HOUR), Calendar.getInstance().get(
Calendar.MINUTE), Calendar.getInstance().get(
Calendar.SECOND), 0);
System.out.println(tt);
try {
String sToDate = "2005-8-18";//用于转换成java.sql.Date的字符串
String sToTimestamp = "2005-8-18 14:21:12.123";//用于转换成java.sql.Timestamp的字符串
Date date1 = string2Date(sToDate);
Timestamp date2 = string2Time(sToTimestamp);
System.out.println("Date:"+date1.toString());//结果显示
System.out.println("Timestamp:"+date2.toString());//结果显示
}catch(Exception e) {
e.printStackTrace();
}
}
}
1. package test;
2.
3. import java.text.DateFormat;
4. import java.text.ParseException;
5. import java.text.SimpleDateFormat;
6.
7. import java.util.Calendar;
8. import java.util.Date;
9. import java.util.Hashtable;
10.
11. import javax.swing.JOptionPane;
12.
13.
14.
15. public class Test2{
16.
17. public static boolean isdate(String s){
18. String a[]=s.split("-");
19. boolean flg=true;
20. if(!(Integer.parseInt(a[0])>=1950 && Integer.parseInt(a[0])<=2050)){
21. flg=false;
22. }
23. return flg;
24. }
25.
26. public static boolean checkDate(String s){
27. boolean ret = true;
28. try{
29. DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
30. ret = df.format(df.parse(s)).equals(s);
31. }
32. catch(ParseException e){
33. ret = false;
34. }
35. return ret;
36. }
37.
38. public Object dateinfo(String s){
39. String a[]=s.split("-",2);
40. Hashtable fest =new Hashtable();
41. fest.put("01-01","元旦节");
42. fest.put("02-14","情人节");
43. fest.put("03-12","植树节");
44. fest.put("03-15","消费者节");
45. fest.put("04-01","愚人节");
46. fest.put("04-05","清明节");
47. fest.put("05-01","劳动节");
48. fest.put("06-01","儿童节");
49. fest.put("07-01","建党节");
50. fest.put("08-01","建军节");
51. fest.put("09-10","教师节");
52. fest.put("10-01","国庆节");
53. fest.put("12-25","圣诞节");
54. if(fest.containsKey(a[1])){
55. return fest.get(a[1]);
56. }
57. else{
58. return "无节日";
59. }
60. }
61.
62. public String xingzuo(Date s){
63. Calendar cal = Calendar.getInstance();
64. cal.setTime(s);
65. String xingzuo="无";
66. int day=cal.get(Calendar.DAY_OF_YEAR);
67. if((cal.get(Calendar.YEAR)%4==0)&&(cal.get(Calendar.YEAR)%100!=0)||(cal.get(Calendar.YEAR)%400==0)){
68. if((day>=1 &&day<=19)||(day>=357&&day<=366)){
69. xingzuo= "魔蝎座";
70. }
71. else if(day>=20 &&day<=49){
72. xingzuo= "水瓶座";
73. }
74. else if(day>=50 &&day<=80){
75. xingzuo= "双鱼座";
76. }
77. else if(day>=81 &&day<=110){
78. xingzuo= "白羊座";
79. }
80. else if(day>=111 &&day<=141){
81. xingzuo= "金牛座";
82. }
83. else if(day>=142 &&day<=173){
84. xingzuo= "双子座";
85. }
86. else if(day>=174 &&day<=203){
87. xingzuo= "巨蟹座";
88. }
89. else if(day>=204 &&day<=235){
90. xingzuo= "狮子座";
91. }
92. else if(day>=236 &&day<=266){
93. xingzuo= "处女座";
94. }
95. else if(day>=267 &&day<=296){
96. xingzuo= "天秤座";
97. }
98. else if(day>=297 &&day<=326){
99. xingzuo= "天蝎座";
100. }
101. else if(day>=327 &&day<=356){
102. xingzuo= "射手座";
103. }
104. }
105. else{
106. if((day>=1 &&day<=19)||(day>=357&&day<=366)){
107. xingzuo= "魔蝎座";
108. }
109. else if(day>=20 &&day<=48){
110. xingzuo= "水瓶座";
111. }
112. else if(day>=49 &&day<=79){
113. xingzuo= "双鱼座";
114. }
115. else if(day>=80 &&day<=109){
116. xingzuo= "白羊座";
117. }
118. else if(day>=110 &&day<=140){
119. xingzuo= "金牛座";
120. }
121. else if(day>=141 &&day<=172){
122. xingzuo= "双子座";
123. }
124. else if(day>=173 &&day<=202){
125. xingzuo= "巨蟹座";
126. }
127. else if(day>=203 &&day<=234){
128. xingzuo= "狮子座";
129. }
130. else if(day>=235 &&day<=265){
131. xingzuo= "处女座";
132. }
133. else if(day>=266 &&day<=295){
134. xingzuo= "天秤座";
135. }
136. else if(day>=296 &&day<=325){
137. xingzuo= "天蝎座";
138. }
139. else if(day>=326 &&day<=355){
140. xingzuo= "射手座";
141. }
142. }
143. return xingzuo;
144. }
145.
146. public Date parseDate(String s){
147. SimpleDateFormat bartDateFormat = new SimpleDateFormat("yyyy-MM-dd");
148. try {
149. Date date3 = bartDateFormat.parse(s);
150. date3=bartDateFormat.parse(s);
151. return date3;
152. }
153. catch (Exception ex) {
154. return null;
155. }
156. }
157.
158. public static void main(String[] args) {
159. Calendar cal = Calendar.getInstance();
160. Test2 test2=new Test2();
161. String date1=JOptionPane.showInputDialog("请你输入日期,格式如2000-10-15");
162.
163. while(!(Test2.checkDate(date1)&&Test2.isdate(date1))){
164. date1=JOptionPane.showInputDialog("请你输入日期,格式如2000-10-15");
165. }
166. SimpleDateFormat bartDateFormat1 = new SimpleDateFormat("yyyy,MM,dd,EEEE");
167. SimpleDateFormat bartDateFormat2 = new SimpleDateFormat("yyyy-MM-dd");
168. Date date2=test2.parseDate(date1);
169. String festinfo=(String)test2.dateinfo(date1);
170. System.out.println(bartDateFormat1.format(date2) +","+ festinfo+","+ test2.xingzuo(date2));
171.
172.
173.
174. String day=JOptionPane.showInputDialog("请你输入要查询N天后的日期信息");
175. cal.setTime(date2);
176. cal.add(Calendar.DATE, Integer.parseInt(day));
177. String date5=bartDateFormat2.format(cal.getTime());
178. festinfo=(String)test2.dateinfo(date5);
179. System.out.println(bartDateFormat1.format(cal.getTime())+","+ festinfo+","+ test2.xingzuo(cal.getTime()));
180. }
181. }
1.计算某一月份的最大天数
Calendar time=Calendar.getInstance();
time.clear();
time.set(Calendar.YEAR,year);
time.set(Calendar.MONTH,i-1);//注意,Calendar对象默认一月为0
int day=time.getActualMaximum(Calendar.DAY_OF_MONTH);//本月份的天数
注:在使用set方法之前,最好先clear一下,否则很多信息会继承自系统当前时间
2.Calendar和Date的转化
(1) Calendar转化为Date
Calendar cal=Calendar.getInstance();
Date date=cal.getTime();
(2) Date转化为Calendar
Date date=new Date();
Calendar cal=Calendar.getInstance();
cal.setTime(date);
3.格式化输出日期时间
Date date=new Date();
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
System.out.println(df.format(date));
4.计算一年中的第几星期
(1)计算某一天是一年中的第几星期
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 9);
cal.set(Calendar.DAY_OF_MONTH, 3);
int weekno=cal.get(Calendar.WEEK_OF_YEAR);
(2)计算一年中的第几星期是几号
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.WEEK_OF_YEAR, 1);
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
System.out.println(df.format(cal.getTime()));
输出:
2006-01-02
5.add()和roll()的用法
(1)add()方法
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal=Calendar.getInstance();
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 9);
cal.set(Calendar.DAY_OF_MONTH, 3);
cal.add(Calendar.DATE, -4);
Date date=cal.getTime();
System.out.println(df.format(date));
cal.add(Calendar.DATE, 4);
date=cal.getTime();
System.out.println(df.format(date));
输出:
2006-08-30
2006-10-03
(2)roll方法
cal.set(Calendar.YEAR, 2006);
cal.set(Calendar.MONTH, 9);
cal.set(Calendar.DAY_OF_MONTH, 3);
cal.roll(Calendar.DATE, -4);
date=cal.getTime();
System.out.println(df.format(date));
cal.roll(Calendar.DATE, 4);
date=cal.getTime();
System.out.println(df.format(date));
输出:
2006-10-29
2006-10-03
可见,roll()方法在本月内循环,一般使用add()方法;
6.计算两个任意时间中间的间隔天数
(1)传进Calendar对象
/** *//**计算两个时间之间相隔天数
* @param startday 开始时间
* @param endday 结束时间
* @return
*/
public int getIntervalDays(Calendar startday,Calendar endday)...{
//确保startday在endday之前
if(startday.after(endday))...{
Calendar cal=startday;
startday=endday;
endday=cal;
}
//分别得到两个时间的毫秒数
long sl=startday.getTimeInMillis();
long el=endday.getTimeInMillis();
long ei=el-sl;
//根据毫秒数计算间隔天数
return (int)(ei/(1000*60*60*24));
}
(2)传进Date对象
/** *//**计算两个时间之间相隔天数
* @param startday 开始时间
* @param endday 结束时间
* @return
*/
public int getIntervalDays(Date startday,Date endday)...{
//确保startday在endday之前
if(startday.after(endday))...{
Date cal=startday;
startday=endday;
endday=cal;
}
//分别得到两个时间的毫秒数
long sl=startday.getTime();
long el=endday.getTime();
long ei=el-sl;
//根据毫秒数计算间隔天数
return (int)(ei/(1000*60*60*24));
}同理,可以用相同的方法计算出任意两个时间相隔的小时数,分钟数,秒钟数等
注:以上方法是完全按时间计算,有时并不能令人满意,如:
startday="2006-10-11 20:00:00"
endday="2006-10-12 8:00:00"
计算结果为0,但是我们也许相让计算结果变为1,此时可以用如下方法实现:
在传参之前,先设定endday的时间,如:
endday.set(Calendar.HOUR_OF_DAY, 23);
endday.set(Calendar.MINUTE, 59);
endday.set(Calendar.SECOND, 59);
endday.set(Calendar.MILLISECOND, 59);
这样再传进去startday,endday,则结果就如我们所愿了。不过,如果嫌以上方法麻烦,可以参考以下方法:
(3)改进精确计算相隔天数的方法
public int getDaysBetween (Calendar d1, Calendar d2) ...{
if (d1.after(d2)) ...{ // swap dates so that d1 is start and d2 is end
java.util.Calendar swap = d1;
d1 = d2;
d2 = swap;
}
int days = d2.get(Calendar.DAY_OF_YEAR) - d1.get(Calendar.DAY_OF_YEAR);
int y2 = d2.get(Calendar.YEAR);
if (d1.get(Calendar.YEAR) != y2) ...{
d1 = (Calendar) d1.clone();
do ...{
days += d1.getActualMaximum(Calendar.DAY_OF_YEAR);//得到当年的实际天数
d1.add(Calendar.YEAR, 1);
} while (d1.get(Calendar.YEAR) != y2);
}
return days;
}
获取系统当前时间:
public static String getSystemTime(){
Date date=new Date();
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return df.format(date);
}
//字符串转化成时间类型(字符串可以是任意类型,只要和SimpleDateFormat中的格式一致即可)
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("M/dd/yyyy hh:mm:ss a",java.util.Locale.US);
java.util.Date d = sdf.parse("5/13/2003 10:31:37 AM");
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String mDateTime1=formatter.format(d);
//当前时间
Calendar cal = Calendar.getInstance();
// SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss G E D F w W a E F");
String mDateTime=formatter.format(cal.getTime());
//1年前日期
java.util.Date myDate=new java.util.Date();
long myTime=(myDate.getTime()/1000)-60*60*24*365;
myDate.setTime(myTime*1000);
String mDate=formatter.format(myDate);
//明天日期
myDate=new java.util.Date();
myTime=(myDate.getTime()/1000)+60*60*24;
myDate.setTime(myTime*1000);
mDate=formatter.format(myDate);
//两个时间之间的天数
SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
java.util.Date date= myFormatter.parse("2003-05-1");
java.util.Date mydate= myFormatter.parse("1899-12-30");
long day=(date.getTime()-mydate.getTime())/(24*60*60*1000);
//加半小时
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
java.util.Date date1 = format.parse("2002-02-28 23:16:00");
long Time=(date1.getTime()/1000)+60*30;
date1.setTime(Time*1000);
String mydate1=formatter.format(date1);
//年月周求日期
SimpleDateFormat formatter2 = new SimpleDateFormat("yyyy-MM F E");
java.util.Date date2= formatter2.parse("2003-05 5 星期五");
SimpleDateFormat formatter3 = new SimpleDateFormat("yyyy-MM-dd");
String mydate2=formatter3.format(date2);
//求是星期几
mydate= myFormatter.parse("2001-1-1");
SimpleDateFormat formatter4 = new SimpleDateFormat("E");
String mydate3=formatter4.format(mydate);
在 开发web应用中,针对不同的数据库日期类型,我们需要在我们的程序中对日期类型做各种不同的转换。若对应数据库数据是oracle的Date类型,即只 需要年月日的,可以选择使用java.sql.Date类型,若对应的是MSsqlserver数据库的DateTime类型,即需要年月日时分秒的,选 择java.sql.Timestamp类型
你可以使用dateFormat定义时间日期的格式,转一个字符串即可
package personal.jessica;
import java.util.Date;
import java.util.Calendar;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Locale;
class Datetest{
/**
*method 将字符串类型的日期转换为一个timestamp(时间戳记java.sql.Timestamp)
*@param dateString 需要转换为timestamp的字符串
*@return dataTime timestamp
*/
public final static java.sql.Timestamp string2Time(String dateString)
throws java.text.ParseException {
DateFormat dateFormat;
dateFormat = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss.SSS", Locale.ENGLISH);//设定格式
//dateFormat = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss", Locale.ENGLISH);
dateFormat.setLenient(false);
java.util.Date timeDate = dateFormat.parse(dateString);//util类型
java.sql.Timestamp dateTime = new java.sql.Timestamp(timeDate.getTime());//Timestamp类型,timeDate.getTime()返回一个long型
return dateTime;
}
/**
*method 将字符串类型的日期转换为一个Date(java.sql.Date)
*@param dateString 需要转换为Date的字符串
*@return dataTime Date
*/
public final static java.sql.Date string2Date(String dateString)
throws java.lang.Exception {
DateFormat dateFormat;
dateFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH);
dateFormat.setLenient(false);
java.util.Date timeDate = dateFormat.parse(dateString);//util类型
java.sql.Date dateTime = new java.sql.Date(timeDate.getTime());//sql类型
return dateTime;
}
public static void main(String[] args){
Date da = new Date();
//注意:这个地方da.getTime()得到的是一个long型的值
System.out.println(da.getTime());
//由日期date转换为timestamp
//第一种方法:使用new Timestamp(long)
Timestamp t = new Timestamp(new Date().getTime());
System.out.println(t);
//第二种方法:使用Timestamp(int year,int month,int date,int hour,int minute,int second,int nano)
Timestamp tt = new Timestamp(Calendar.getInstance().get(
Calendar.YEAR) - 1900, Calendar.getInstance().get(
Calendar.MONTH), Calendar.getInstance().get(
Calendar.DATE), Calendar.getInstance().get(
Calendar.HOUR), Calendar.getInstance().get(
Calendar.MINUTE), Calendar.getInstance().get(
Calendar.SECOND), 0);
System.out.println(tt);
try {
String sToDate = "2005-8-18";//用于转换成java.sql.Date的字符串
String sToTimestamp = "2005-8-18 14:21:12.123";//用于转换成java.sql.Timestamp的字符串
Date date1 = string2Date(sToDate);
Timestamp date2 = string2Time(sToTimestamp);
System.out.println("Date:"+date1.toString());//结果显示
System.out.println("Timestamp:"+date2.toString());//结果显示
}catch(Exception e) {
e.printStackTrace();
}
}
}
1. package test;
2.
3. import java.text.DateFormat;
4. import java.text.ParseException;
5. import java.text.SimpleDateFormat;
6.
7. import java.util.Calendar;
8. import java.util.Date;
9. import java.util.Hashtable;
10.
11. import javax.swing.JOptionPane;
12.
13.
14.
15. public class Test2{
16.
17. public static boolean isdate(String s){
18. String a[]=s.split("-");
19. boolean flg=true;
20. if(!(Integer.parseInt(a[0])>=1950 && Integer.parseInt(a[0])<=2050)){
21. flg=false;
22. }
23. return flg;
24. }
25.
26. public static boolean checkDate(String s){
27. boolean ret = true;
28. try{
29. DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
30. ret = df.format(df.parse(s)).equals(s);
31. }
32. catch(ParseException e){
33. ret = false;
34. }
35. return ret;
36. }
37.
38. public Object dateinfo(String s){
39. String a[]=s.split("-",2);
40. Hashtable fest =new Hashtable();
41. fest.put("01-01","元旦节");
42. fest.put("02-14","情人节");
43. fest.put("03-12","植树节");
44. fest.put("03-15","消费者节");
45. fest.put("04-01","愚人节");
46. fest.put("04-05","清明节");
47. fest.put("05-01","劳动节");
48. fest.put("06-01","儿童节");
49. fest.put("07-01","建党节");
50. fest.put("08-01","建军节");
51. fest.put("09-10","教师节");
52. fest.put("10-01","国庆节");
53. fest.put("12-25","圣诞节");
54. if(fest.containsKey(a[1])){
55. return fest.get(a[1]);
56. }
57. else{
58. return "无节日";
59. }
60. }
61.
62. public String xingzuo(Date s){
63. Calendar cal = Calendar.getInstance();
64. cal.setTime(s);
65. String xingzuo="无";
66. int day=cal.get(Calendar.DAY_OF_YEAR);
67. if((cal.get(Calendar.YEAR)%4==0)&&(cal.get(Calendar.YEAR)%100!=0)||(cal.get(Calendar.YEAR)%400==0)){
68. if((day>=1 &&day<=19)||(day>=357&&day<=366)){
69. xingzuo= "魔蝎座";
70. }
71. else if(day>=20 &&day<=49){
72. xingzuo= "水瓶座";
73. }
74. else if(day>=50 &&day<=80){
75. xingzuo= "双鱼座";
76. }
77. else if(day>=81 &&day<=110){
78. xingzuo= "白羊座";
79. }
80. else if(day>=111 &&day<=141){
81. xingzuo= "金牛座";
82. }
83. else if(day>=142 &&day<=173){
84. xingzuo= "双子座";
85. }
86. else if(day>=174 &&day<=203){
87. xingzuo= "巨蟹座";
88. }
89. else if(day>=204 &&day<=235){
90. xingzuo= "狮子座";
91. }
92. else if(day>=236 &&day<=266){
93. xingzuo= "处女座";
94. }
95. else if(day>=267 &&day<=296){
96. xingzuo= "天秤座";
97. }
98. else if(day>=297 &&day<=326){
99. xingzuo= "天蝎座";
100. }
101. else if(day>=327 &&day<=356){
102. xingzuo= "射手座";
103. }
104. }
105. else{
106. if((day>=1 &&day<=19)||(day>=357&&day<=366)){
107. xingzuo= "魔蝎座";
108. }
109. else if(day>=20 &&day<=48){
110. xingzuo= "水瓶座";
111. }
112. else if(day>=49 &&day<=79){
113. xingzuo= "双鱼座";
114. }
115. else if(day>=80 &&day<=109){
116. xingzuo= "白羊座";
117. }
118. else if(day>=110 &&day<=140){
119. xingzuo= "金牛座";
120. }
121. else if(day>=141 &&day<=172){
122. xingzuo= "双子座";
123. }
124. else if(day>=173 &&day<=202){
125. xingzuo= "巨蟹座";
126. }
127. else if(day>=203 &&day<=234){
128. xingzuo= "狮子座";
129. }
130. else if(day>=235 &&day<=265){
131. xingzuo= "处女座";
132. }
133. else if(day>=266 &&day<=295){
134. xingzuo= "天秤座";
135. }
136. else if(day>=296 &&day<=325){
137. xingzuo= "天蝎座";
138. }
139. else if(day>=326 &&day<=355){
140. xingzuo= "射手座";
141. }
142. }
143. return xingzuo;
144. }
145.
146. public Date parseDate(String s){
147. SimpleDateFormat bartDateFormat = new SimpleDateFormat("yyyy-MM-dd");
148. try {
149. Date date3 = bartDateFormat.parse(s);
150. date3=bartDateFormat.parse(s);
151. return date3;
152. }
153. catch (Exception ex) {
154. return null;
155. }
156. }
157.
158. public static void main(String[] args) {
159. Calendar cal = Calendar.getInstance();
160. Test2 test2=new Test2();
161. String date1=JOptionPane.showInputDialog("请你输入日期,格式如2000-10-15");
162.
163. while(!(Test2.checkDate(date1)&&Test2.isdate(date1))){
164. date1=JOptionPane.showInputDialog("请你输入日期,格式如2000-10-15");
165. }
166. SimpleDateFormat bartDateFormat1 = new SimpleDateFormat("yyyy,MM,dd,EEEE");
167. SimpleDateFormat bartDateFormat2 = new SimpleDateFormat("yyyy-MM-dd");
168. Date date2=test2.parseDate(date1);
169. String festinfo=(String)test2.dateinfo(date1);
170. System.out.println(bartDateFormat1.format(date2) +","+ festinfo+","+ test2.xingzuo(date2));
171.
172.
173.
174. String day=JOptionPane.showInputDialog("请你输入要查询N天后的日期信息");
175. cal.setTime(date2);
176. cal.add(Calendar.DATE, Integer.parseInt(day));
177. String date5=bartDateFormat2.format(cal.getTime());
178. festinfo=(String)test2.dateinfo(date5);
179. System.out.println(bartDateFormat1.format(cal.getTime())+","+ festinfo+","+ test2.xingzuo(cal.getTime()));
180. }
181. }
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