simpleDateFormat日期格式转换

1-------------------------------------------------------------------------------------

package com.neusoft.date;

import Java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class SimpleDateFormat01
{

    public static void main(String[] args) throws ParseException
    {
        // TODO Auto-generated method stub
      String str = "2009-02-15 09:21:35.345";
      SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss.SSS");
      SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy年MM月dd日 hh时mm分ss秒SSS毫秒");
      Date date = sdf1.parse(str);//提取格式中的日期
      System.out.println("转换之前的日期："+date);
      String newStr = sdf2.format(date); //改变格式
      System.out.println("转换之后的日期："+newStr);
        
    }

}

 

2-------------------------------------------------------------------------------------

package com.neusoft.date;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class SimpleDateFormatDemo02
{
 public static void main(String []args) throws ParseException{
    String str = "2009-02-15 09:21:35.345";//接收参数
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss.SSS");
    SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy年MM月dd日");
    Date date = sdf.parse(str);//提取格式中的日期
    String str1 = sdf1.format(date);
    System.out.println(date);
    System.out.println(str1);
    
 }
}

3-------------------------------------------------------------------------------------

package com.neusoft.date;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class SimpleDateFormatDemo03
{
    SimpleDateFormat sdf = null;
    //2012-03-05
    public String DateFormat(){
        this.sdf = new SimpleDateFormat("yyyy-MM-dd");
        String str = this.sdf.format(new Date());
        return str;
    }
    //2012-03-05 05:27:15:390
    public String DateFormat1(){
        this.sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss:SSS");
        String str = this.sdf.format(new Date());
        return str;
    }
    //2012年03月05日
    public String dateNewFormat(){
        this.sdf = new SimpleDateFormat("yyyy年MM月dd日");
        String str = this.sdf.format(new Date());
        return str;
    }
    //2012年03月05日05时26分19秒437毫秒
    public String dateNewFormat1(){
        this.sdf = new SimpleDateFormat("yyyy年MM月dd日hh时mm分ss秒SSS毫秒");
        String str = this.sdf.format(new Date());
        return str;
    }
    public String dateNewFormat2(){
        this.sdf = new SimpleDateFormat("yyyyMMddhhmmssSSS");
        String str = this.sdf.format(new Date());
        return str;
    }
 public static void main(String []args) throws ParseException{
     SimpleDateFormatDemo03 ss= new SimpleDateFormatDemo03();
     System.out.println(ss.DateFormat());
     System.out.println(ss.DateFormat1());
     System.out.println(ss.dateNewFormat());
     System.out.println(ss.dateNewFormat1());
     System.out.println(ss.dateNewFormat2());
 }
}