[Java 常用類庫]:DateUtils(嚴格日期轉換通用類)
該類庫由于設置lenient為false，所以執行的是嚴格的日期轉換（判斷日期字符串是否正確我通過會嚴格轉換日期捕獲異常來判斷）。
例如：
2013-2-30這樣的日期，在不嚴格（寬松）的條件下，可以轉換成功。
轉換結果為：
2013-3-2 0:00:00
在嚴格的情況下就會報錯：
Exception in thread "main" java.text.ParseException: Unparseable date: "2013-2-30"
at java.text.DateFormat.parse(DateFormat.java:337)
at com.test.TestDate.main(TestDate.java:19)
該類庫提供了多種方法，代碼如下：/**
* 嚴格的日期轉換setLenient(false);
* setLenient
* public void setLenient(boolean lenient)指定日期/時間解析是否不嚴格。進行不嚴格解析時，解析程序可以使用啟發式的方法來解釋與此對象的格式不精確匹配的輸入。進行嚴格解析時，輸入必須匹配此對象的格式。
* 參數：
* lenient - 為 true 時，解析過程是不嚴格的
* 不會自動將錯誤日期轉換為正確的日期
* 例如:19450000,使用原DateUtil會轉換為19441130
* @author liuzh
*/
public class DateUtils {
public static final String COMPACT_DATE_FORMAT = "yyyyMMdd";
public static final String YM = "yyyyMM";
public static final String NORMAL_DATE_FORMAT = "yyyy-MM-dd";
public static final String NORMAL_DATE_FORMAT_NEW = "yyyy-mm-dd hh24:mi:ss";
public static final String DATE_FORMAT = "yyyy-MM-dd";
public static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
public static final String DATE_ALL = "yyyyMMddHHmmssS";
public static Long strDateToNum(String paramString) throws Exception {
if (paramString == null)
return null;
String[] arrayOfString = null;
String str = "";
if (paramString.indexOf("-") >= 0) {
arrayOfString = paramString.split("-");
for (int i = 0; i < arrayOfString.length; ++i)
str = str + arrayOfString[i];
return Long.valueOf(Long.parseLong(str));
}
return Long.valueOf(Long.parseLong(paramString));
}
public static Long strDateToNum1(String paramString) throws Exception {
if (paramString == null)
return null;
String[] arrayOfString = null;
String str = "";
if (paramString.indexOf("-") >= 0) {
arrayOfString = paramString.split("-");
for (int i = 0; i < arrayOfString.length; ++i)
if (arrayOfString[i].length() == 1)
str = str + "0" + arrayOfString[i];
else
str = str + arrayOfString[i];
return Long.valueOf(Long.parseLong(str));
}
return Long.valueOf(Long.parseLong(paramString));
}
public static String numDateToStr(Long paramLong) {
if (paramLong == null)
return null;
String str = null;
str = paramLong.toString().substring(0, 4) + "-"
+ paramLong.toString().substring(4, 6) + "-"
+ paramLong.toString().substring(6, 8);
return str;
}
public static Long sysDateToNum() throws Exception {
SimpleDateFormat localSimpleDateFormat = new SimpleDateFormat(
"yyyy-MM-dd");
localSimpleDateFormat.setLenient(false);
return strDateToNum(localSimpleDateFormat.format(HBUtil.getSysdate()));
}
public static java.util.Date stringToDate(String paramString1,
String paramString2) throws Exception {
SimpleDateFormat localSimpleDateFormat = new SimpleDateFormat(
paramString2);
localSimpleDateFormat.setLenient(false);
try {
return localSimpleDateFormat.parse(paramString1);
} catch (ParseException localParseException) {
throw new Exception("解析日期字符串時出錯！");
}
}
public static String dateToString(java.util.Date paramDate,
String paramString) {
SimpleDateFormat localSimpleDateFormat = new SimpleDateFormat(
paramString);
localSimpleDateFormat.setLenient(false);
return localSimpleDateFormat.format(paramDate);
}
public static java.util.Date compactStringToDate(String paramString)
throws Exception {
return stringToDate(paramString, "yyyyMMdd");
}
public static String dateToCompactString(java.util.Date paramDate) {
return dateToString(paramDate, "yyyyMMdd");
}
public static String dateToNormalString(java.util.Date paramDate) {
return dateToString(paramDate, "yyyy-MM-dd");
}
public static String compactStringDateToNormal(String paramString)
throws Exception {
return dateToNormalString(compactStringToDate(paramString));
}
public static int getDaysBetween(java.util.Date paramDate1,
java.util.Date paramDate2) throws Exception {
Calendar localCalendar1 = Calendar.getInstance();
Calendar localCalendar2 = Calendar.getInstance();
localCalendar1.setTime(paramDate1);
localCalendar2.setTime(paramDate2);
if (localCalendar1.after(localCalendar2))
throw new Exception("起始日期小于終止日期!");
int i = localCalendar2.get(6) - localCalendar1.get(6);
int j = localCalendar2.get(1);
if (localCalendar1.get(1) != j) {
localCalendar1 = (Calendar) localCalendar1.clone();
do {
i += localCalendar1.getActualMaximum(6);
localCalendar1.add(1, 1);
} while (localCalendar1.get(1) != j);
}
return i;
}
public static java.util.Date addDays(java.util.Date paramDate, int paramInt)
throws Exception {
Calendar localCalendar = Calendar.getInstance();
localCalendar.setTime(paramDate);
int i = localCalendar.get(6);
localCalendar.set(6, i + paramInt);
return localCalendar.getTime();
}
public static java.util.Date addDays(String paramString1,
String paramString2, int paramInt) throws Exception {
Calendar localCalendar = Calendar.getInstance();
java.util.Date localDate = stringToDate(paramString1, paramString2);
localCalendar.setTime(localDate);
int i = localCalendar.get(6);
localCalendar.set(6, i + paramInt);
return localCalendar.getTime();
}
public static java.sql.Date getSqlDate(java.util.Date paramDate)
throws Exception {
java.sql.Date localDate = new java.sql.Date(paramDate.getTime());
return localDate;
}
public static String formatDate(java.util.Date paramDate) {
if (paramDate == null)
return null;
SimpleDateFormat localSimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
localSimpleDateFormat.setLenient(false);
return localSimpleDateFormat.format(paramDate);
}
public static String formatDateTime(java.util.Date paramDate) {
if (paramDate == null)
return null;
SimpleDateFormat localSimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
localSimpleDateFormat.setLenient(false);
return localSimpleDateFormat.format(paramDate);
}
public static java.util.Date parseDate(String paramString)
throws Exception {
if ((paramString == null) || (paramString.trim().equals("")))
return null;
SimpleDateFormat localSimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
localSimpleDateFormat.setLenient(false);
try {
return localSimpleDateFormat.parse(paramString);
} catch (ParseException localParseException) {
throw new Exception("日期解析出錯！", localParseException);
}
}
public static java.util.Date parseDateTime(String paramString)
throws Exception {
if ((paramString == null) || (paramString.trim().equals("")))
return null;
SimpleDateFormat localSimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
localSimpleDateFormat.setLenient(false);
try {
return localSimpleDateFormat.parse(paramString);
} catch (ParseException localParseException) {
throw new Exception("時間解析異常！", localParseException);
}
}
public static Integer getYM(String paramString) throws Exception {
if (paramString == null)
return null;
SimpleDateFormat localSimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
localSimpleDateFormat.setLenient(false);
java.util.Date localDate;
try {
localDate = localSimpleDateFormat.parse(paramString);
} catch (ParseException localParseException) {
throw new Exception("時間解析異常！", localParseException);
}
return getYM(localDate);
}
public static Integer getYM(java.util.Date paramDate) {
if (paramDate == null)
return null;
Calendar localCalendar = Calendar.getInstance();
localCalendar.setTime(paramDate);
int i = localCalendar.get(1);
int j = localCalendar.get(2) + 1;
return new Integer(i * 100 + j);
}
public static int addMonths(int paramInt1, int paramInt2) {
Calendar localCalendar = Calendar.getInstance();
localCalendar.set(1, paramInt1 / 100);
localCalendar.set(2, paramInt1 % 100 - 1);
localCalendar.set(5, 1);
localCalendar.add(2, paramInt2);
return getYM(localCalendar.getTime()).intValue();
}
public static java.util.Date addMonths(java.util.Date paramDate,
int paramInt) {
Calendar localCalendar = Calendar.getInstance();
localCalendar.setTime(paramDate);
localCalendar.add(2, paramInt);
return localCalendar.getTime();
}
public static int monthsBetween(int paramInt1, int paramInt2) {
int i = paramInt2 / 100 * 12 + paramInt2 % 100
- (paramInt1 / 100 * 12 + paramInt1 % 100);
return i;
}
public static int monthsBetween(java.util.Date paramDate1,
java.util.Date paramDate2) {
return monthsBetween(getYM(paramDate1).intValue(), getYM(paramDate2).intValue());
}
public static String getChineseDate(Calendar paramCalendar) {
int i = paramCalendar.get(1);
int j = paramCalendar.get(2);
int k = paramCalendar.get(5);
StringBuffer localStringBuffer = new StringBuffer();
localStringBuffer.append(i);
localStringBuffer.append("年");
localStringBuffer.append(j + 1);
localStringBuffer.append("月");
localStringBuffer.append(k);
localStringBuffer.append("日");
return localStringBuffer.toString();
}
public static String getChineseWeekday(Calendar paramCalendar) {
switch (paramCalendar.get(7)) {
case 2:
return "星期一";
case 3:
return "星期二";
case 4:
return "星期三";
case 5:
return "星期四";
case 6:
return "星期五";
case 7:
return "星期六";
case 1:
return "星期日";
}
return "未知";
}
public static void main(String[] paramArrayOfString) {
try {
System.out.println(formatDate(addMonths(parseDate("2013-01-06"), 12)));
} catch (Exception localException) {
System.out.println(localException);
}
}