String类型转换成date

public static void main(String[] args) throws Exception {
		String time = "2017-05-08 17:00:00";
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		java.util.Date date_util = sdf.parse(time); //转换为util.date
		java.sql.Date date_sql = new java.sql.Date(date_util.getTime());//转换为sql.date
		System.out.println(date_util);
		System.out.println(date_sql);
		String date = sdf.format(date_sql);
		System.out.println(date);
		date = sdf.format(date_util);
		System.out.println(date);
	}