java时间随机数_Java生成时间随机数

文件上传或下载或许会用到，生成时间的随机数。

例：文件名+"_"+ts.getTimeRand()+扩展名。(TimeStamp ts = new TimeStamp())

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Random;

public class TimeStamp

{

private SimpleDateFormat sdf = null;

public String getTimeRand()

{

StringBuffer buf = new StringBuffer();

buf.append(getTimeStamp());

Random r = new Random();

for (int i = 0; i < 3; i++) {

buf.append(r.nextInt(10));

}

return buf.toString();

}

public String getDate() {

this.sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");

return this.sdf.format(new Date());

}

public String getTimeStamp() {

this.sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");

return this.sdf.format(new Date());

}

}