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";//接收參数

    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());

 }

}