java中字符串与日期的转换实例

import java.sql.timestamp;
import java.text.dateformat;

import java.text.parseexception;

import java.text.simpledateformat;

import java.util.date;

public class dateio {

public static void main(string[] args) {

date date= new  dateio().strtodate("2013-04-01");

string strdate=new dateio().datetostr(date);

string srrdate=new dateio().timestamptostr(system.currenttimemillis());

timestamp ts=new dateio().strtotimestamp(new date());

}

//string 转换为 date

public date strtodate(string strdate){

dateformat format = new simpledateformat("yyyy-mm-dd"); 

date date = null;   

try {

date = format.parse(strdate);

} catch (parseexception e) {

e.printstacktrace();

}

system.out.println("date:"+date);

return date;

}

//date 转换为 string

public string datetostr(date date){

//年月日****-**-**

dateformat format = new simpledateformat("yyyy-mm-dd"); 

string str = format.format(date);   

system.out.println("str:"+str);

//年月日**-*-*

format = dateformat.getdateinstance(dateformat.short);     

str = format.format(date);  

system.out.println(str); 

//年月日****-*-*

format = dateformat.getdateinstance(dateformat.medium);     

str = format.format(date); 

system.out.println(str); 

//****年*月*日星期*

format = dateformat.getdateinstance(dateformat.full);     

str = format.format(date);

system.out.println(str); 

return str;

}

//timestamp转换为string

public string timestamptostr(long timestamp){

simpledateformat df = new simpledateformat("yyyy-mm-dd hh:mm:ss");//定义格式，不显示毫秒 

string str = df.format(timestamp); 

system.out.println(str); 

return str;

}

//date转换为timestamp

public timestamp strtotimestamp(date date){

simpledateformat df = new simpledateformat("yyyy-mm-dd hh:mm:ss"); 

string time = df.format(date); 

timestamp ts = timestamp.valueof(time); 

system.out.println(ts); 

return ts;

}

}