Java中Date各种相关用法（4）
发布时间：2010/9/14 10:41:01 来源：城市学习网 编辑：ziteng
/**
*method 将字符串类型的日期转换为一个Date（java.sql.Date）
*@param dateString 需要转换为Date的字符串
*@return dataTime Date
*/
public final static java.sql.Date string2Date(String dateString)
throws java.lang.Exception {
DateFormat dateFormat;
dateFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH);
dateFormat.setLenient(false);
java.util.Date timeDate = dateFormat.parse(dateString);//util类型
java.sql.Date dateTime = new java.sql.Date(timeDate.getTime());//sql类型
return dateTime;
}
public static void main(String[] args){
Date da = new Date();
//注意：这个地方da.getTime()得到的是一个long型的值
System.out.println(da.getTime());
//由日期date转换为timestamp
//第一种方法：使用new Timestamp(long)
Timestamp t = new Timestamp(new Date().getTime());
System.out.println(t);
//第二种方法：使用Timestamp(int year,int month,int date,int hour,int minute,int second,int nano)
Timestamp tt = new Timestamp(Calendar.getInstance().get(
Calendar.YEAR) - 1900, Calendar.getInstance().get(
Calendar.MONTH), Calendar.getInstance().get(
Calendar.DATE), Calendar.getInstance().get(
Calendar.HOUR), Calendar.getInstance().get(
Calendar.MINUTE), Calendar.getInstance().get(
Calendar.SECOND), 0);
System.out.println(tt);
try {
String sToDate = "2005-8-18";//用于转换成java.sql.Date的字符串
String sToTimestamp = "2005-8-18 14:21:12.123";//用于转换成java.sql.Timestamp的字符串
Date date1 = string2Date(sToDate);
Timestamp date2 = string2Time(sToTimestamp);
System.out.println("Date:"+date1.toString());//结果显示
System.out.println("Timestamp:"+date2.toString());//结果显示
}catch(Exception e) {
e.printStackTrace();
}
}
}
Java获取系统时间的年份
Java代码
public static String getYear(){
Calendar ca = Calendar.getInstance();
ca.setTime(new java.util.Date());
String year = ""+ca.get(Calendar.YEAR);
return year;
}
public void getYear(){
Calendar ca = Calendar.getInstance();
ca.setTime(new java.util.Date());
SimpleDateFormat simpledate = new SimpleDateFormat("yyyyMMdd");
String date = simpledate.format(ca.getTime());
int year = ca.get(Calendar.YEAR);
int month = ca.get(Calendar.MONTH);
int day = ca.get(Calendar.DAY_OF_MONTH);
System.out.println(date+"||"+year+"||"+month+"||"+day);
}
