java.util.Date、java.sql.Date与String

package date_transfor;

import java.text.SimpleDateFormat;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 *
 * @author henry.xiao
 *
 */
public class Date_transfor {

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

 public static java.sql.Date string_to_sqlDate(String date) throws Exception {
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
  java.util.Date dDate = sdf.parse(date.trim());
  java.sql.Date sDate = new java.sql.Date(dDate.getYear(), dDate
    .getMonth(), dDate.getDate());
  log.debug("from String_to_util.Date :" + sDate);
  return sDate;
 }

 public static java.sql.Date uitlDate_to_sqlDate(java.util.Date dDate)
   throws Exception {
  java.sql.Date sDate = new java.sql.Date(dDate.getYear(), dDate
    .getMonth(), dDate.getDate());
  log.debug("from util.Date_to_sql.Date :" + sDate);
  return sDate;
 }

 public static String sqlDate_to_String(java.sql.Date sDate) {
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
  java.util.Date dSt = (java.util.Date) sDate;
  String date = sdf.format(dSt);
  log.debug("from sql.Date_to_string :" + date);
  return date;
 }

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

  /**
   * test from util.Date to sql.Date or string
   */
   java.util.Date dDate = new java.util.Date();
   java.sql.Date sDate = Date_transfor.uitlDate_to_sqlDate(dDate);
   String date = Date_transfor.sqlDate_to_String(sDate);
  /**
   * test from string to sql.Date
   */
//  String date = "2009-03-18";
//  java.sql.Date sDate = Date_transfor.string_to_sqlDate(date);
 }
}