代码如下：
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
（本文来源于图老师网站，更多请访问https://m.tulaoshi.com/bianchengyuyan/）public Date strToDate(String strdate){
DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
（本文来源于图老师网站，更多请访问https://m.tulaoshi.com/bianchengyuyan/）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");
（本文来源于图老师网站，更多请访问https://m.tulaoshi.com/bianchengyuyan/）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;
}
}
