java中常用日期工具类
/**
?* 此文件描述的是：常用工具转换类
?*/
import java.io.File;
import java.io.UnsupportedEncodingException;
import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
?
?
/**
?* @author blaiu
?*
?*/
public class Common {
?
?/**
? * 此类描述的是：字符串与时间类型的转换
? * @param date
? * @return String类型，格式为：yyyy年MM月dd日? 星期EEE HH时mm分ss秒
? */
?public static String getStr1(Date date) {
??DateFormat dateFormat = new SimpleDateFormat("yyyy年MM月dd日? 星期EEE HH时mm分ss秒");
??String timeStr = dateFormat.format(date);
??return timeStr;
?}
?
?
?public static String getStrShort(Date date) {
??DateFormat dateFormat = new SimpleDateFormat("MM-dd");
??String timeStr = dateFormat.format(date);
??return timeStr;
?}
?
?
?/**
? * 此类描述的是：字符串与时间类型的转换
? * @param date
? * @return String类型，格式为：yyyyMM
? */
?public static String getStr2() {
??Date date = new Date();
??DateFormat dateFormat = new SimpleDateFormat("yyyyMM");
??String timeStr = dateFormat.format(date);
??return timeStr;
?}
?/**
? * 此类描述的是：字符串与时间类型的转换
? * @param date
? * @return String类型，格式为:yyyy-MM-dd
? */
?public static String getStr(Date date) {
??DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
??String timeStr = dateFormat.format(date);
??return timeStr;
?}
?
?/**
? * 此类描述的是：字符串与时间类型的转换
? * @param time
? * @return String类型，格式为:yyyy-MM-dd HH:mm:ss
? */
?public static String getStr2(Date date) {
??DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??String timeStr = dateFormat.format(date);
??return timeStr;
?}
?/**
? * 此类描述的是：字符串与时间类型的转换
? * @param str
? * @return Date类型，格式为:yyyy-MM-dd
? */?
?public static Date getDateShort(String str) {
??SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
??ParsePosition pos = new ParsePosition(0);
??Date formatDate = dateFormat.parse(str, pos);
??return formatDate;
?}
?/**
? * 此类描述的是：字符串与时间类型的转换
? * @param str
? * @return Date类型，格式为:yyyy-MM-dd HH:mm:ss
? */
?public static Date getDateFull(String str) {
??if(null==str || "".equals(str)) {
???return null;
??} else {
???SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
???ParsePosition pos = new ParsePosition(0);
???Date formatDate = dateFormat.parse(str, pos);
???System.out.println(formatDate.toString());
???return formatDate;
??}
?}
?
?/**
? *
? * @此方法描述的是：获得当前的时间 例如：Mon May 18 10:26:29 CST 2009
? * @return
? * Date
? */
?public static Date getDate() {
??Date date = new Date();
??return date;
?}
?
?/**
? *
? * @此方法描述的是：获得当前的时间 例如：yyyy-MM-dd HH:mm:ss
? * @return
? * String
? */
?public static String getFullTime() {
??Calendar calendar = null;
??SimpleDateFormat formatter = null;
??????? calendar = new GregorianCalendar();
??????? formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??????? return formatter.format(calendar.getTime());
?}
?
??? /**
??? * 对给定字符进行 URL 解码
??? *
??? * @param value
??? *??????????? String
??? * @return String
??? */
??? public static String decode(String value) {
??????? String result = "";
??????? if (!isEmpty(value)) {
??????????? try {
??????????????? result = java.net.URLDecoder.decode(value, "UTF-8");???????????????
??????????????? result = java.net.URLDecoder.decode(result, "UTF-8");???????????????
??????????? } catch (UnsupportedEncodingException ex) {
??????????? }
??????? }
??????? return result;
??? }
??? /**
??? * 对给定字符进行 URL 编码
??? *
??? * @param value
??? *??????????? String
??? * @return String
??? */
??? public static String encode(String value) {
??????? String result = "";
??????? if (!isEmpty(value)) {
??????????? try {
??????????????? result = java.net.URLEncoder.encode(value, "UTF-8");
??????????????? result = java.net.URLEncoder.encode(result, "UTF-8");
??????????? } catch (UnsupportedEncodingException ex) {
??????????? }
??????? }
??????? return result;
??? }
??? /**
??? * 判断是否为空，为空返回true
??? *
??? * @param value
??? *??????????? String
??? * @return boolean
??? */
??? public static boolean isEmpty(String value) {
??????? if (value == null || value.trim().equals("") || value.trim().equals("null")) {
??????? ?return true;
??????? } else {
??????? ?return false;
??????? }
??? }
???
??? /**
???? *
???? * 此方法描述的是：时间转换
???? * @param num
???? * @return
???? * String
???? */
??? public static String getClosedDate(String num){
??? ?if(null==num || "".equals(num)) {
??? ??return null;
??? ?} else {
??? ??Calendar calendar = new GregorianCalendar();
??? ??SimpleDateFormat formatter = null;
??? ??formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??? ??if(num.equals("1")){
??? ???calendar.add(calendar.DAY_OF_YEAR, +1);
??? ???return formatter.format(calendar.getTime());
??? ??}else if(num.equals("2")){
??? ???calendar.add(calendar.DAY_OF_YEAR, +7);
??? ???return formatter.format(calendar.getTime());
??? ??}else if(num.equals("3")){
??? ???calendar.add(calendar.DAY_OF_YEAR, +30);
??? ???return formatter.format(calendar.getTime());
??? ??}else if(num.equals("4")){
??? ???calendar.add(calendar.MONTH, +3);
??? ???return formatter.format(calendar.getTime());
??? ??}else if(num.equals("5")){
??? ???calendar.add(calendar.MONTH, +6);
??? ???return formatter.format(calendar.getTime());
??? ??}else{
??? ???calendar.add(calendar.YEAR, +1);
??? ???return formatter.format(calendar.getTime());
??? ??}
??? ?}
?}
???
??? public static String getWebInfPath(){
??????? return new File(Common.class.getResource("/").getPath()).getParent();
??? }
???
??? public static String getUploadPath() {
??? ?return new File( new File( new File( new File(Common.class.getResource("/").getPath()).getParent()).getParent()).getParent()).getParent();
??? }
???
??? public static void main(String[] args) {
??System.out.println(getWebInfPath());
?}
}
