java中字符串转换Date类型

 1 public static Date date(String date_str) {
 2         try {
 3             Calendar zcal = Calendar.getInstance();//日期类
 4             Timestamp timestampnow = new Timestamp(zcal.getTimeInMillis());//转换成正常的日期格式
 5             SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");//改为需要的东西
 6             ParsePosition pos = new ParsePosition(0);
 7             java.util.Date current = formatter.parse(date_str, pos);
 8             timestampnow = new Timestamp(current.getTime());
 9             return timestampnow;
10         }
11         catch (NullPointerException e) {
12             return null;
13         }
14     }