java String与Date类型之间的相互转换

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package test;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.text.ParseException;

import java.util.Date;

public class StringOrDate {

    public static String dateToString(Date date, String type) {

        String str = null;

        DateFormat format = new SimpleDateFormat("yyyy-MM-dd");

        if (type.equals("SHORT")) {

            // 07-1-18

            format = DateFormat.getDateInstance(DateFormat.SHORT);

            str = format.format(date);

        } else if (type.equals("MEDIUM")) {

            // 2007-1-18

            format = DateFormat.getDateInstance(DateFormat.MEDIUM);

            str = format.format(date);

        } else if (type.equals("FULL")) {

            // 2007年1月18日 星期四

            format = DateFormat.getDateInstance(DateFormat.FULL);

            str = format.format(date);

        }

        return str;

    }

    public static Date stringToDate(String str) {

        DateFormat format = new SimpleDateFormat("yyyy-MM-dd");

        Date date = null;

        try {

            // Fri Feb 24 00:00:00 CST 2012

            date = format.parse(str);

        } catch (ParseException e) {

            e.printStackTrace();

        }

        // 2012-02-24

        date = java.sql.Date.valueOf(str);

                                             

        return date;

    }

    public static void main(String[] args) {

        Date date = new Date();

        System.out.println(StringOrDate.dateToString(date, "MEDIUM"));

        String str = "2012-2-24";

        System.out.println(StringOrDate.stringToDate(str));

    }

}