Code:
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public static Date stringToDate(String time){
- SimpleDateFormat formatter;
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int tempPos=time.indexOf("AD") ;
- time=time.trim() ;
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formatter = new SimpleDateFormat ("yyyy.MM.dd G 'at' hh:mm:ss z");
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if(tempPos>-1){
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time=time.substring(0,tempPos)+
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"公元"+time.substring(tempPos+"AD".length());
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formatter = new SimpleDateFormat ("yyyy.MM.dd G 'at' hh:mm:ss z");
- }
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tempPos=time.indexOf("-");
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if(tempPos>-1&&(time.indexOf(" ")<0)){
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formatter = new SimpleDateFormat ("yyyyMMddHHmmssZ");
- }
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else if((time.indexOf("/")>-1) &&(time.indexOf(" ")>-1)){
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formatter = new SimpleDateFormat ("yyyy/MM/dd HH:mm:ss");
- }
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else if((time.indexOf("-")>-1) &&(time.indexOf(" ")>-1)){
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formatter = new SimpleDateFormat ("yyyy-MM-dd HH:mm:ss");
- }
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else if((time.indexOf("/")>-1) &&(time.indexOf("am")>-1) ||(time.indexOf("pm")>-1)){
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formatter = new SimpleDateFormat ("yyyy-MM-dd KK:mm:ss a");
- }
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else if((time.indexOf("-")>-1) &&(time.indexOf("am")>-1) ||(time.indexOf("pm")>-1)){
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formatter = new SimpleDateFormat ("yyyy-MM-dd KK:mm:ss a");
- }
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ParsePosition pos = new ParsePosition(0);
- java.util.Date ctime = formatter.parse(time, pos);
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return ctime;
- }
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public static String dateToString(Date time){
- SimpleDateFormat formatter;
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formatter = new SimpleDateFormat ("yyyy-MM-dd HH:mm:ss");
- String ctime = formatter.format(time);
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return ctime;
- }
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public static String dateToString(Date time,int x){
- SimpleDateFormat formatter;
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formatter = new SimpleDateFormat ("yyyy-MM-dd KK:mm:ss a");
- String ctime = formatter.format(time);
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return ctime;
- }
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public static String Now(){
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return dateToString(new Date());
- }
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public static String Now(int hour){
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return dateToString(new Date(),hour);
- }
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public static String getYYYY_MM_DD(){
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return dateToString(new Date()).substring(0,10);
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- }
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public static String getYYYY_MM_DD(String date){
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return date.substring(0,10);
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- }
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public static String getHour(){
- SimpleDateFormat formatter;
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formatter = new SimpleDateFormat ("H");
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String ctime = formatter.format(new Date());
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return ctime;
- }
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public static String getDay(){
- SimpleDateFormat formatter;
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formatter = new SimpleDateFormat ("d");
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String ctime = formatter.format(new Date());
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return ctime;
- }
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public static String getMonth(){
- SimpleDateFormat formatter;
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formatter = new SimpleDateFormat ("M");
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String ctime = formatter.format(new Date());
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return ctime;
- }
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public static String getYear(){
- SimpleDateFormat formatter;
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formatter = new SimpleDateFormat ("yyyy");
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String ctime = formatter.format(new Date());
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return ctime;
- }
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public static String getWeek(){
- SimpleDateFormat formatter;
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formatter = new SimpleDateFormat ("E");
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String ctime = formatter.format(new Date());
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return ctime;
- }
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- 在jsp页面中的日期格式和sqlserver中的日期格式不一样，怎样统一？
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- 在页面上显示输出时，用下面的函数处理一下
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public class DateUtil(){
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public static String fmtShortEnu(Date myDate) {
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SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");
- String strDate = formatter.format(myDate);
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return strDate;
- }
- }
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new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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new java.text.SimpleDateFormat("yyyy-MM-dd")
- 建议还是把sqlserver的字段类型改成varchar的吧，用字符串处理可以完全按照自己的意愿处理，没有特殊的需求，不要使用date型
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- 字串日期格式转换
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用的API是SimpleDateFormat，它是属於java.text.SimpleDateFormat，所以请记得import进来！
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- 用法：
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SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
- 这一行最重要，它确立了转换的格式，yyyy是完整的西元年，MM是月份，dd是日期， 至於HH:mm:ss就不需要我再解释了吧！
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ps:为什麽有的格式大写，有的格式小写，那是怕避免混淆，例如MM是月份，mm是分；HH是24小时制，而hh是12小时制
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1.字串转日期：
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2002-10-8 15:30:22要把它转成日期，可以用
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Date date=sdf.parse("2002-10-8 15:30:22");
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2.日期转字串
- 假如把今天的日期转成字串可用
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String datestr=sdf.format(new Date());
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这个字串的内容便类似2002-10-08 14:55:38
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透过这个API我们便可以随心所欲的将日期转成我们想要的字串格式，例如希望将日期输出成2002年10月08日，
- 我们可以这麽写：
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SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日");
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String datestr=sdf.format(new Date());
- datestr便会依照我们设定的格式输出
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public java.sql.Date Convert(String str)
- {
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java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd");
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try
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- java.util.Date d = sdf.parse(str);
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java.sql.Date d1 = new java.sql.Date(d.getTime());
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return d1;
- }
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catch(Exception ex)
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- ex.printStackTrace();
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return null;
- }
- }
- 应用如下：
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ctmt.setDate(7,this.Convert(info.getManBirth()));
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- 常用日期问题集锦
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1、获取服务器端当前日期：
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<%@ page import="java.util.Date"%>
- <%
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Date myDate = new Date();
- %>
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2、获取当前年、月、日：
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<%@ page import="java.util.Date"%>
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- <%
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Date myDate = new Date();
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int thisYear = myDate.getYear() + 1900;
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int thisMonth = myDate.getMonth() + 1;
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int thisDate = myDate.getDate();
- %>
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3、按本地时区输出当前日期
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<%@ page import="java.util.Date"%>
- <%
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Date myDate = new Date();
- out.println(myDate.toLocaleString());
- %>
- 输出结果为：
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2003-5-30
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4、获取数据库中字段名为”publish_time“、类型为Datetime的值
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<%@ page import="java.util.Date"%>
- <%
- ...连接数据库...
- ResultSet rs = ...
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Date sDate = rs.getDate("publish_time");
- %>
- [code]
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5、按照指定格式打印日期
- [code]
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<%@ page import="java.util.Date"%>
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<%@ page import="java.text.DateFormat"%>
- <%
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Date dNow = new Date();
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SimpleDateFormat formatter = new SimpleDateFormat("E yyyy.MM.dd 'at' hh:mm:ss a zzz");
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out.println("It is " + formatter.format(dNow));
- %>
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- 输出的结果为：
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It is 星期五 2003.05.30 at 11:30:46 上午 CST
- (更为详尽的格式符号请参看SimpleDateFormat类)
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6、将字符串转换为日期
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<%@ page import="java.util.Date"%>
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<%@ page import="java.text.DateFormat"%>
- <%
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String input = "1222-11-11";
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SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
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Date t = null;
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try{
- t = formatter.parse(input);
- out.println(t);
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}catch(ParseException e){
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out.println("unparseable using " + formatter);
- }
- %>
- 输出结果为：
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Fri Nov 11 00:00:00 CST 1222
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7、计算日期之间的间隔
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<%@ page import="java.util.Date"%>
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<%@ page import="java.text.DateFormat"%>
- <%
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String input = "2003-05-01";
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SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
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Date d1 = null;
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try{
- d1 = formatter.parse(input);
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}catch(ParseException e){
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out.println("unparseable using " + formatter);
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Date d2 = new Date();
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long diff = d2.getTime() - d1.getTime();
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out.println("Difference is " + (diff/(1000*60*60*24)) + " days.");
- %>
- 输出结果为：
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Difference is 29 days.
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8、日期的加减运算
- 方法：用Calendar类的add()方法
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<%@ page import="java.util.*"%>
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<%@ page import="java.text.*"%>
- <%
- Calendar now = Calendar.getInstance();
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SimpleDateFormat formatter = new SimpleDateFormat("E yyyy.MM.dd 'at' hh:mm:ss a zzz");
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out.println("It is now " + formatter.format(now.getTime()));
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now.add(Calendar.DAY_OF_YEAR,-(365*2));
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out.println("<br>");
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out.println("Two years ago was " + formatter.format(now.getTime()));
- %>
- 输出结果为：
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It is now 星期五 2003.05.30 at 01:45:32 下午 CST
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Two years ago was 星期三 2001.05.30 at 01:45:32 下午 CST
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9、比较日期
- 方法：用equals()、before()、after()方法
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<%@ page import="java.util.*"%>
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<%@ page import="java.text.*"%>
- <%
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DateFormat df = new SimpleDateFormat("yyy-MM-dd");
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Date d1 = df.parse("2000-01-01");
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Date d2 = df.parse("1999-12-31");
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String relation = null;
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if(d1.equals(d2))
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relation = "the same date as";
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else if(d1.before(d2))
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relation = "before";
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else
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relation = "after";
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out.println(d1 +" is " + relation + ' ' + d2);
- %>
- 输出结果为：
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Sat Jan 01 00:00:00 CST 2000 is after Fri Dec 31 00:00:00 CST 1999
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10、记录一件事所花费的时间
- 方法：调用两次System.getTimeMillis()方法，求差值
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<%@ page import="java.text.*"%>
- <%
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long t0,t1;
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out.println("Cyc starts at " + t0);
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int k = 0;
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for(int i =0;i<100000;i++){
- k += i;
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- t1 = System.currentTimeMillis();
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out.println("<br>");
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out.println("Cyc ends at " + t1);
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out.println("<br>");
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out.println("This run took " + (t1-t0) + "ms.");
- %>
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- 输出结果为：
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Cyc starts at 1054275312432
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Cyc ends at 1054275312442
- This run took 10ms.
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- 其它：如何格式化小数
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<%@ page import="java.text.*"%>
- <%
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DecimalFormat df = new DecimalFormat(",###.00");
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double aNumber = 33665448856.6568975;
- String result = df.format(aNumber);
- out.println(result);
- %>
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- 输出结果为：
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33,665,448,856.66
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- ======================
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- 日期比较：
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- 在JAVA中日期的计算与比较可以使用Date和DateFormat来解决，下面是一段示例代码：
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import java.text.*;
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import java.util.*;
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public class Test{
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public static void main(String[] args){
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try{
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Date date=new Date();
- DateFormat df=DateFormat.getDateTimeInstance();
- String now=df.format(date);
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System.out.println("现在时间:"+now);
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System.out.println("现在时间是否在16:00之前:"+date.before(df.parse("2004-12-24 16:00:00")));
- }
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catch(ParseException e){System.out.print(e.getMessage());
- }
- }
