java 日期格式化

日期格式化的示例：

package util;import java.math.BigDecimal;import java.text.DateFormat;import java.text.DecimalFormat;import java.text.ParseException;import java.text.ParsePosition;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date; import java.util.List;import java.util.TimeZone;public class Tools {private static String _STR="";private static String _STR1="";private static Integer _Y=0;private static double _D=0d;public static Date getDate(){return new Date();}public static Date getDate(Long date){return new Date(date);}public static String getCurrentDate(){return currentTime("yyyy-MM-dd");}/** * format:yyyy-MM-dd * @return currentTime */public static String dateformat1(){return currentTime("yyyy-MM-dd");}/** * format:yyyy-MM-dd hh:mm:ss * @return currentTime */public static String dateformat2(){return currentTime("yyyy-MM-dd hh:mm:ss");}/** * format:MM/dd/yyyy hh:mm:ss * @return currentTime */public static String dateformat3(){return currentTime("MM/dd/yyyy hh:mm:ss");}/** * format:MM/dd/yyyy * @return currentTime */public static String dateformat4(){return currentTime("MM/dd/yyyy");}/** * eg:Mon Apr 15 2013 to 2013-04-15 * @return */public static String dateformat5(String date){String currentDate="";String[] months={"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};String[] nums={"01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12"};if(!"".equals(date) && null !=date){String _year=date.substring(11, 15);String _mon=date.substring(4, 7);String _day=date.substring(8, 10); for (int i=0; i<months.length; i++) {if(months[i].equalsIgnoreCase(_mon))_mon=nums[i];}currentDate=_mon+"/"+_day+"/"+_year;}return currentDate;} public static Long dateFormat6(String time){String temp="";SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");Date date=null; if(!"".equals(time)){ try { date = sdf.parse(time); DecimalFormat df = new DecimalFormat("#");temp=df.format(date.getTime());} catch (ParseException e) {e.printStackTrace();}} return Tools.parseLong(temp);}public static String dateFormat7(String l){String date="";if(!"".equals(l)){SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");date=sdf.format(getDate(parseLong(l))).toString();}return date;}/** * from yyyy-MM-dd HH:mm:ss parse to MM/dd/yyyy HH:mm:ss * @param date * @return */public static String dateParse(String time){String temp="";if(!"".equals(time)){temp=time.substring(5, 7)+"/"+time.substring(8, 10)+"/"+time.substring(0,4)+time.substring(10, 19);}return temp;}/** * from MM/dd/yyyy HH:mm:ss parse to yyyy-MM-dd HH:mm:ss * @param time * @return */public static String dateParse1(String time){String temp="";if(!"".equals(time)){temp=time.substring(6, 10)+"-"+time.substring(0, 2)+"-"+time.substring(3,5)+time.substring(10, 19);}return temp;}//获取当前时间public static String currentTime(String formate){  SimpleDateFormat sdf=new SimpleDateFormat(formate); return sdf.format(new Date());} /** *  * @description :  * @author : divan * @param param  eg: param=0 is current date;  //param>0  After a few days;// param<0 Before a few days; * @return */@SuppressWarnings("deprecation")public static String currentDate(int param){String result="";String param1="00:00:00";String param2="23:59:59";// startDate=2013-03-19 00:00:00// end Date= 2013-03-19 23:59:59Date date=new Date();int y=0, m=0, d=0;y=2013;m=date.getMonth()+1;d=date.getDate(); if(param < 0){if(d+param>0){result=combinationDateTime(y, m, d+param, param1)+","+combinationDateTime(y, m, d+param, param2);}else if(m !=2 && (d-param<0)){ //非2月份if(m ==1){//1 月份result=combinationDateTime(y-1, 12, ((d+31)+param), param1)+","+combinationDateTime(y-1, 12, ((d+31)+param), param2);}else{result=combinationDateTime(y, (m-1), ((d+31)+param), param1)+","+combinationDateTime(y, (m-1), ((d+31)+param), param2);}}else{ //2月份 result=combinationDateTime(y, (m-1), ((d+28)+param), param1)+","+combinationDateTime(y, (m-1), ((d+28)+param), param2);}}else{result=combinationDateTime(y, m, d, param1)+","+combinationDateTime(y, m, d, param2);}return result;}public static String matchState(String[] states, String[] states1,  String currentState, String[] colors, String default1){String temp=default1;if(null != currentState){for(int i=0; i < states.length; i++){if(states[i].equalsIgnoreCase(currentState)){temp=colors[i];break;}}for(int i=0; i < states1.length; i++){if(states1[i].equalsIgnoreCase(currentState)){temp=colors[i];break;}}}  return temp;}public static String combinationDateTime(int year, int month, int day, String time){return year+"-"+month+"-"+day+" "+time;} /** * html中 * @param strDate (eg:2012-12-05T07:41:31GMTX+28800) * @return */public static String formatTime(String strDate){String result="";  if(!"".equals(strDate) && null != strDate){ result=strDate.substring(0, 10)+" "+strDate.substring(11,19); }return result;}/** * java中 * @param strDate (eg:2012-12-05T07:41:31GMTX+28800) * @return */public static String formatTime1(String strDate){ String result="";  if(!"".equals(strDate) && null != strDate){ result=strDate.substring(0, 10)+" "+strDate.substring(11,19); }return result;}/** * 将GMT时间转换为北京时间 * @param gmtTime * @return */public static String convertTime(String gmtTime){String result="";if(!"".equals(gmtTime) && gmtTime!=null){SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");ParsePosition pos = new ParsePosition(0);Date date = sdf2.parse(gmtTime, pos);sdf.setTimeZone(TimeZone.getTimeZone("GMT+16"));result = sdf.format(date);}return result;}/** * 用于转换解析所得GMT时间转换为CST * 2013-09-11T17:00:00GMTX+28800 * @param strDate * @return */public static String formatTimetoCST(String strDate){String result="";  if(!"".equals(strDate) && null != strDate){ result=strDate.substring(0, 10)+" "+strDate.substring(11,19); }result = Tools.convertTime(result);return result;}public static String filterStr(String str){String temp="";if("".equals(str)  || "null".equals(str) || str==null){}else{temp=str;}return temp;}/**   * 将长时间格式字符串转换为时间 yyyy-MM-dd HH:mm:ss   * @param strDate   * @return Date   */public static Date strToDateLong(String strDate) {   SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");   ParsePosition pos = new ParsePosition(0);   Date strToDate = formatter.parse(strDate, pos);   return strToDate;}public static int parseInt(String value) {String val = value;if ((val == null) || (val.length() == 0)) {return 0;}val = val.trim();try {return Integer.parseInt(val);} catch (Exception ex) {ex.printStackTrace();}return 0;}public static double parseDouble(String value){String val=value;if ((val == null) || (val.length() == 0)) {return 0;}val = val.trim();try {return Double.parseDouble(val);} catch (Exception ex) {ex.printStackTrace();}return 0;}public static int parseInteger(String value){String val=value;if ((val == null) || (val.length() == 0)) {return 0;}val = val.trim();try {return Integer.parseInt(val);} catch (Exception ex) {ex.printStackTrace();}return 0;}public static Long parseLong(String value){String val=value;if ((val == null) || (val.length() == 0)) {return 0l;}val = val.trim();try {return Long.parseLong(val);} catch (Exception ex) {ex.printStackTrace();}return 0l;}/** * formate double with 2 points * @param value * @return */public static double formatDouble(Double value){ try {BigDecimal  b  =  new  BigDecimal(value); return b.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();} catch (Exception ex) {ex.printStackTrace();}return 0;} /** *  * @description : 把当前空间大小进行转换成最小单位，然后返回数据， * @author : divan * @param str (eg:312 G、0.0 M) * @return  */ public static double parseGbMb(String str){String[] units={"T","G","M"};double result=0d;String V="";String originalUnit="";String originalValue="";if(!"".equals(str) && isContait(units, str) && !"null null".equals(str)){V=str;originalUnit=V.substring(V.length()-1, V.length());originalValue=V.substring(0, V.length()-1);if(units[0].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue)*1024*1024;}if(units[1].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue)*1024;}if(units[2].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue);}} return result;}/** *  * @param str Capacity Size * @param currentLevel 0:byte, 1=kb , 2=mb, 3=gb, 4=tb * @para们 parseLevel 0:byte, 1=kb , 2=mb, 3=gb, 4=tb * @return */public static String formatCapacity(String str, int currentLevel, int parseLevel){_STR="";String[][] _STRS=new String[5][5];_STRS[0][0]="Byte";_STRS[0][1]="KB";_STRS[0][2]="MB";_STRS[0][3]="GB";_STRS[0][4]="TB";//首先进行过滤if(-1 != currentLevel){_Y=currentLevel;}else{if(!"".equals(str) && null != str){//初始化单位 _STRS[1][0]="Byte";_STRS[1][1]="Kb";_STRS[1][2]="Mb";_STRS[1][3]="Gb";_STRS[1][4]="Tb";_STRS[2][0]="byte";_STRS[2][1]="kb";_STRS[2][2]="mb";_STRS[2][3]="gb";_STRS[2][4]="tb";_STRS[3][0]="B";_STRS[3][1]="K";_STRS[3][2]="M";_STRS[3][3]="G";_STRS[3][4]="T";_STRS[4][0]="b";_STRS[4][1]="k";_STRS[4][2]="m";_STRS[4][3]="g";_STRS[4][4]="t";//判断传入值，使用单位 for (int i = 0; i < _STRS.length; i++) {for (int j = 0; j < 5; j++) {_STR1=_STRS[i][j]; if(str.indexOf(_STR1)!=-1){_Y=j; if(i==0 || i==1 || i==2)str=str.substring(0, str.length()-2); if(i==3 || i==4)str=str.substring(0, str.length()-1); break;}}}}} //转换最小单位if(!"".equals(_Y)){_D=0d;switch(_Y){case 0:_D=parseDouble(str);break;case 1:_D=parseDouble(str)*1024;break;case 2:_D=parseDouble(str)*1024*1024;break;case 3:_D=parseDouble(str)*1024*1024*1024;break;case 4:_D=parseDouble(str)*1024*1024*1024*1024;break;}} //对 _LONG转换统一单位  switch(parseLevel){case 0: //byteBigDecimal  b1  =  new  BigDecimal(_D); _STR=b1.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue()+_STRS[0][0];break;case 1:BigDecimal  b2  =  new  BigDecimal(_D/1024); _STR=b2.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue()+_STRS[0][1];break;case 2:BigDecimal  b3  =  new  BigDecimal(_D/1024/1024); _STR=b3.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue()+_STRS[0][2]; break;case 3:BigDecimal  b4  =  new  BigDecimal(_D/1024/1024/1024); _STR=b4.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue()+_STRS[0][3]; break;case 4:BigDecimal  b5  =  new  BigDecimal(_D/1024/1024/1024/1024); _STR=b5.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue()+_STRS[0][4]; break; } return _STR;}/** * @description 把当前数据转换成Mb， 然后返回 * @param str * @return */public static double parseGbMb2(String str){String[] units={"TB", "GB","MB"};double result=0d;String V="";String originalUnit="";String originalValue="";if(!"".equals(str) && isContait(units, str)){V=str;originalUnit=V.substring(V.length()-2, V.length());originalValue=V.substring(0, V.length()-2);if(units[0].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue)*1024*1024;}if(units[1].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue)*1024;}if(units[2].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue);}};  return result;}/** * @description parse t,g,m to k * @param str * @return */public static double parseCapacity(String str){String[] units={"T","G","M", "K", "Byte"};double result=0d;String V="";String originalUnit="";String originalValue="";if(!"".equals(str) && isContait(units, str) && !"null null".equals(str)){V=str;originalUnit=V.substring(V.length()-1, V.length());originalValue=V.substring(0, V.length()-1);if(units[0].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue)*1024*1024*1024*1024;}else if(units[1].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue)*1024*1024*1024;}else if(units[2].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue)*1024*1024;}else if(units[3].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue)*1024;}else if(units[4].equalsIgnoreCase(originalUnit)){result=parseDouble(originalValue);}} return result;}public static String parseByteToTB(Double d){/**    *   1kb=1000Byte *    1MB=1024KB *    1GB=1024MB *    1TB=2014GB */String[] units={"Byte","KB", "MB", "GB", "TB"};String result="";Double tempV=0d; int i=0;if(d!= null && d>1000){i++;tempV=d/1024;while(tempV>1024){i++;tempV=tempV/1024;}result=formatDouble(tempV)+units[i];}else{result="0"+units[0];}return result;}/** * @description parse double param from bm to tb * @param capacity_mb * @return */public static String formatCapacity(double capacity_mb){String[] units={"MB","GB","TB"};String result="";double V=0d;int index=0;if(!"".equals(capacity_mb)){V=capacity_mb; while (V>1024){index++;V=V/1024;};V=formatDouble(V);if(index==0){result=V+units[0];}if(index==1){result=V+units[1];}if(index==2){result=V+units[2];}};  return result;} /** * @description parse double param from bm to tb * @param capacity_mb * @return */public static String formatCapacity(String capacity_mb){String[] units={"MB","GB","TB"};String result="";double V=0d;int index=0;if(!"".equals(capacity_mb)){V=parseDouble(capacity_mb); while (V>1024){index++;V=V/1024;};V=formatDouble(V);if(index==0){result=V+units[0];}if(index==1){result=V+units[1];}if(index==2){result=V+units[2];}};  return result;} public static boolean isContait(String[] strs, String v){boolean b=false;if(strs.length>0){for (String str : strs) {if(v.indexOf(str)>0)b=true;}}return b;}/** *  format pct (eg: 0.2 is 0.2/divided) * @param pct * @param divided * @return */public static Double formatPCTMultiplyBy(double pct, double multiply){double d=0d;d=pct*multiply;return d;}/** *  * @param pct * @param divided * @return */public static Double formatPCTDividedBy(double pct, double divided){double d=0d;if( 0 != divided){d=pct/divided;}return d;}/** * format pct (eg:0.2 is 0.2) * @param pct * @return */public static Double formatPCT(String pct){double d=0d; try{d=parseDouble(pct);}catch(Exception e){e.printStackTrace();}return d;}/** * format pct (eg:0.2 is 0.2) * @param pct * @return */public static double formatPCT(double pct){double d=0d; try{d=formatDouble(pct);}catch(Exception e){e.printStackTrace();}return d;}}