java，

java，

1.问：怎么将“20090909090909”转换成“2009-09-09 09:09:09”

方法：public String getTime(String dateString)
{
SimpleDateFormat df = new SimpleDateFormat("yyyyMMddhhmmss");
try {
//将不规则字符串转换为日期
Date date = df.parse(dateString);
//将日期转换为时间戳
Calendar cal=Calendar.getInstance();
cal.setTime(date);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
return sdf.format(new Date((cal.getTimeInMillis())));

} catch (Exception ex) {

}
return dateString;
}

简易方法
public String getCreateTime()
{
try
{
SimpleDateFormat sourceFormat = new SimpleDateFormat("yyyyMMddHHmmss");

SimpleDateFormat destFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

return destFormat.format(sourceFormat.parse(createTime));

} catch (Exception e)
{
LOGGER.error("createTime format is error.", e);
}

return createTime;
}