java给时间格式化

package com.apress.springrecipes.sequence;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DatePrefix implements Prefix {
   private DateFormat formatter;
   public void setPttern(String pattern){
      this.formatter= new SimpleDateFormat(pattern);
}

@Override
public String getPrefix() {
return formatter.format(new Date());
}

}