依赖
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.9</version>
</dependency>
用法
String -> Date
String str = "2018-01-01 00:00:00";
DateTimeFormatter dtf = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");
Date date = DateTime.parse(str,dtf).toDate();
Date -> String
String s = new DateTime(date).toString(dtf);
System.out.println(s);