安卓学习-其他-日期工具

//时间工具类

import java.sql.Time;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * 日期时间处理工具类
 * @author laichendong
 * @since 2010年2月22日23:09:09
 *
 */
public class DateTime {
    
    private long lNow = System.currentTimeMillis();
    private Calendar cNow = Calendar.getInstance();
    private Date dNow = new Date(lNow);
    private Timestamp tNow = new Timestamp(lNow);
    private java.sql.Date today = new java.sql.Date(lNow);
    private java.sql.Time now = new java.sql.Time(lNow);

    /**
     * 默认构造方法
     */
    public DateTime() {
        
    }

    /*private DateTime(long lNow, Calendar cNow, Date dNow, Timestamp tNow,
            java.sql.Date today, Time now) {
        this.lNow = lNow;
        this.cNow = cNow;
        this.dNow = dNow;
        this.tNow = tNow;
        this.today = today;
        this.now = now;
    }*/

    /**
     * 得到年
     * @param c
     * @return
     */
    public static int getYear(Calendar c){
        if(c != null){
            return c.get(Calendar.YEAR);
        }else{
            return Calendar.getInstance().get(Calendar.YEAR);
        }
    }
    
    /**
     * 得到月份
     * 注意，这里的月份依然是从0开始的
     * @param c
     * @return
     */
    public static int getMonth(Calendar c){
        if(c != null){
            return c.get(Calendar.MONTH);
        }else{
            return Calendar.getInstance().get(Calendar.MONTH);
        }
    }
    
    /**
     * 得到日期
     * @param c
     * @return
     */
    public static int getDate(Calendar c){
        if(c != null){
            return c.get(Calendar.DATE);
        }else{
            return Calendar.getInstance().get(Calendar.DATE);
        }
    }
    
    /**
     * 得到星期
     * @param c
     * @return
     */
    public static int getDay(Calendar c){
        if(c != null){
            return c.get(Calendar.DAY_OF_WEEK);
        }else{
            return Calendar.getInstance().get(Calendar.DAY_OF_WEEK);
        }
    }
    
    /**
     * 得到小时
     * @param c
     * @return
     */
    public static int getHour(Calendar c){
        if(c != null){
            return c.get(Calendar.HOUR);
        }else{
            return Calendar.getInstance().get(Calendar.HOUR);
        }
    }
    
    /**
     * 得到分钟
     * @param c
     * @return
     */
    public static int getMinute(Calendar c){
        if(c != null){
            return c.get(Calendar.MINUTE);
        }else{
            return Calendar.getInstance().get(Calendar.MINUTE);
        }
    }
    
    /**
     * 得到秒
     * @param c
     * @return
     */
    public static int getSecond(Calendar c){
        if(c != null){
            return c.get(Calendar.SECOND);
        }else{
            return Calendar.getInstance().get(Calendar.SECOND);
        }
    }
    
    /**
     * 得到指定或者当前时间前n天的Calendar
     * @param c
     * @param n
     * @return
     */
    public static Calendar beforeNDays(Calendar c, int n){
        //偏移量，给定n天的毫秒数
        long offset = n*24*60*60*1000;
        Calendar calendar = null;
        if(c != null){
            calendar = c;
        }else{
            calendar = Calendar.getInstance();
        }
        
        calendar.setTimeInMillis(calendar.getTimeInMillis() - offset);
        return calendar;
    }
    
    /**
     * 得到指定或者当前时间后n天的Calendar
     * @param c
     * @param n
     * @return
     */
    public static Calendar afterNDays(Calendar c, int n){
        //偏移量，给定n天的毫秒数
        long offset = n*24*60*60*1000;
        Calendar calendar = null;
        if(c != null){
            calendar = c;
        }else{
            calendar = Calendar.getInstance();
        }
        
        calendar.setTimeInMillis(calendar.getTimeInMillis() + offset);
        return calendar;
    }
    
    /**
     * 昨天
     * @param c
     * @return
     */
    public static Calendar yesterday(Calendar c){
        long offset = 1*24*60*60*1000;
        Calendar calendar = null;
        if(c != null){
            calendar = c;
        }else{
            calendar = Calendar.getInstance();
        }
        
        calendar.setTimeInMillis(calendar.getTimeInMillis() - offset);
        return calendar;
    }
    
    /**
     * 明天
     * @param c
     * @return
     */
    public static Calendar tomorrow(Calendar c){
        long offset = 1*24*60*60*1000;
        Calendar calendar = null;
        if(c != null){
            calendar = c;
        }else{
            calendar = Calendar.getInstance();
        }
        
        calendar.setTimeInMillis(calendar.getTimeInMillis() + offset);
        return calendar;
    }
    
    /**
     * 得到指定或者当前时间前offset毫秒的Calendar
     * @param c
     * @param offset
     * @return
     */
    public static Calendar before(Calendar c, long offset){
        Calendar calendar = null;
        if(c != null){
            calendar = c;
        }else{
            calendar = Calendar.getInstance();
        }
        
        calendar.setTimeInMillis(calendar.getTimeInMillis() - offset);
        return calendar;
    }
    
    /**
     * 得到指定或者当前时间前offset毫秒的Calendar
     * @param c
     * @param offset
     * @return
     */
    public static Calendar after(Calendar c, long offset){
        Calendar calendar = null;
        if(c != null){
            calendar = c;
        }else{
            calendar = Calendar.getInstance();
        }
        
        calendar.setTimeInMillis(calendar.getTimeInMillis() - offset);
        return calendar;
    }
    
    /**
     * 日期格式化
     * @param c
     * @param pattern
     * @return
     */
    public static String format(Calendar c, String pattern){
        Calendar calendar = null;
        if(c != null){
            calendar = c;
        }else{
            calendar = Calendar.getInstance();
        }
        if(pattern == null || pattern.equals("")){
            pattern = "yyyy年MM月dd日 HH:mm:ss";
        }
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        
        return sdf.format(calendar.getTime());
    }
    
    /**
     * Date类型转换到Calendar类型
     * @param d
     * @return
     */
    public static Calendar Date2Calendar(Date d){
        Calendar c = Calendar.getInstance();
        c.setTime(d);
        return c;
    }
    
    /**
     * Calendar类型转换到Date类型
     * @param c
     * @return
     */
    public static Date Calendar2Date(Calendar c){
        return c.getTime();
    }
    
    /**
     * Date类型转换到Timestamp类型
     * @param d
     * @return
     */
    public static Timestamp Date2Timestamp(Date d){
        return new Timestamp(d.getTime());
    }
    
    /**
     * Calendar类型转换到Timestamp类型
     * @param c
     * @return
     */
    public static Timestamp Calendar2Timestamp(Calendar c){
        return new Timestamp(c.getTimeInMillis());
    }
    
    /**
     * Timestamp类型转换到Calendar类型
     * @param ts
     * @return
     */
    public static Calendar Timestamp2Calendar(Timestamp ts){
        Calendar c = Calendar.getInstance();
        c.setTime(ts);
        return c;
    }
    
    /**
     * 得到当前时间的字符串表示
     * 格式2010-02-02 12:12:12
     * @return
     */
    public static String getTimeString(){
        return format(Calendar.getInstance(), "yyyy-MM-dd HH:mm:ss");
    }
    

    public static String getTimeString(String foramt){
        return format(Calendar.getInstance(), foramt);
    }
    
    /**
     * 标准日期格式字符串解析成Calendar对象
     * @param s
     * @return
     */
    public static Calendar pars2Calender(String s){
        Timestamp ts = Timestamp.valueOf(s);
        return Timestamp2Calendar(ts);
    }
    
    //================以下是get和set方法=========================//
    
    public long getLNow() {
        return lNow;
    }

    public void setLNow(long now) {
        lNow = now;
    }

    public Calendar getCNow() {
        return cNow;
    }

    public void setCNow(Calendar now) {
        cNow = now;
    }

    public Date getDNow() {
        return dNow;
    }

    public void setDNow(Date now) {
        dNow = now;
    }

    public Timestamp getTNow() {
        return tNow;
    }

    public void setTNow(Timestamp now) {
        tNow = now;
    }

    public java.sql.Date getToday() {
        return today;
    }

    public void setToday(java.sql.Date today) {
        this.today = today;
    }

    public java.sql.Time getNow() {
        return now;
    }

    public void setNow(java.sql.Time now) {
        this.now = now;
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

    }

}