java各類時間類型之間的轉換

1、獲取當前系統時間和日期並格式化輸出:

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//設置日期格式  
 System.out.println(df.format(new Date()));// new Date()爲獲取當前系統時間

2、Date轉換爲Datetime

Date date = new Date();   
  
Timestamp timestamp = new Timestamp(date.getTime()); //2013-01-14 22:45:36.484

 

3、String轉換爲Date

//String轉換爲java.util.Date   
  
String str = "2013-01-14";   
  
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");   
  
Date date = null; //初始化date   
  
try {   
  
date = sdf.parse(str); //Mon Jan 14 00:00:00 CST 2013   
  
} catch (ParseException e) {   
  
e.printStackTrace();   
  
}

4、Date轉換爲String

//java.util.Date轉換爲String   
  
Date date = new Date();   
  
DateFormat format = new SimpleDateFormat("yyyy-MM-dd");   
  
String str = format.format(date); //2013-01-14

5、String轉化爲java.sql.Date

//String轉換爲java.sql.Date   
  
String str = "2013-01-14";   
  
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");   
  
java.sql.Date sdate = null; //初始化   
  
try {   
  
java.util.Date udate = sdf.parse(str);   
  
sdate = new java.sql.Date(udate.getTime()); //2013-01-14   
  
} catch (ParseException e) {   
  
e.printStackTrace();   
  
}