date日期类型与String类型的相互转化

Code:

import java.sql.Timestamp;

import java.text.DateFormat;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;



import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;



/**

* @author zxw

*

*/

public class DateUtil {

private static final Log log = LogFactory.getLog(DateUtil.class);



/**

* 将时间字符串转换为Date类型

* @param dateStr

* @return Date

*/

public static Date toDate(String dateStr) {

Date date = null;

SimpleDateFormat formater = new SimpleDateFormat();

formater.applyPattern("yyyy-MM-dd");

try {

date = formater.parse(dateStr);

} catch (ParseException e) {

e.printStackTrace();

}

return date;

}



/**

* 按照提供的格式将字符串转换成Date类型

* @param dateStr

* @param formaterString

* @return

*/

public static Date toDate(String dateStr, String formaterString) {

Date date = null;

SimpleDateFormat formater = new SimpleDateFormat();

formater.applyPattern(formaterString);

try {

date = formater.parse(dateStr);

} catch (ParseException e) {

e.printStackTrace();

}

return date;

}



/**

* 将Date类型时间转换为字符串

* @param date

* @return

*/

public static String toString(Date date) {



String time;

SimpleDateFormat formater = new SimpleDateFormat();

formater.applyPattern("yyyy-MM-dd");

time = formater.format(date);

return time;

}



/**

* 按照参数提供的格式将Date类型时间转换为字符串

* @param date

* @param formaterString

* @return

*/

public static String toString(Date date, String formaterString) {

String time;

SimpleDateFormat formater = new SimpleDateFormat();

formater.applyPattern(formaterString);

time = formater.format(date);

return time;

}



/**

* method 将字符串类型的日期转换为一个timestamp（时间戳记java.sql.Timestamp）

* @param dateString

* 需要转换为timestamp的字符串

* @return dataTime timestamp

*/

public final static java.sql.Timestamp string2Time(String dateString)

throws java.text.ParseException {

DateFormat dateFormat;

// dateFormat = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss.SSS",

// Locale.ENGLISH);// 设定格式

dateFormat = new SimpleDateFormat("yyyy-MM-dd kk:mm");

dateFormat.setLenient(false);

java.util.Date timeDate = dateFormat.parse(dateString);// util类型

java.sql.Timestamp dateTime = new java.sql.Timestamp(timeDate.getTime());// Timestamp类型,timeDate.getTime()返回一个long型

return dateTime;

}



/**

* method 将字符串类型的日期按照转换为一个timestamp（时间戳记java.sql.Timestamp）

*

* @param dateString 需要转换为timestamp的字符串

* @param formaterString dateString字符串的解析格式

* @return

* @throws java.text.ParseException

*/

public final static java.sql.Timestamp string2Time(String dateString,

String formaterString) throws java.text.ParseException {

DateFormat dateFormat;

dateFormat = new SimpleDateFormat(formaterString);// 设定格式

// dateFormat = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss");

dateFormat.setLenient(false);

java.util.Date timeDate = dateFormat.parse(dateString);// util类型

java.sql.Timestamp dateTime = new java.sql.Timestamp(timeDate.getTime());// Timestamp类型,timeDate.getTime()返回一个long型

return dateTime;

}



public static void main(String[] args) throws ParseException {

String t = DateUtil.toString(new Date());

System.out.println(t);

Date date = DateUtil.toDate("2010-06-17");

System.out.println(date);



// String sToTimestamp = "2005-8-18 14:21:12.123";// 用于转换成java.sql.Timestamp的字符串

String sToTimestamp = "2005-8-18 14:21";// 用于转换成java.sql.Timestamp的字符串

Timestamp Timestamp = string2Time(sToTimestamp);

System.out.println(Timestamp);



}



}