Spring 3.2 Date Format

Question

I am using the standalone Spring framework and I want to implement Spring 3.2 @DateTimeFormat (pattern = "dd / mm / yyyy") but not get the expected result.

My code snippet:

@DateTimeFormat(pattern = "dd/mm/yyyy") private Date dob; public void amehotd(){ Calendar cal; cal = Calendar.getInstance (); cal.set (1999, Calendar.AUGUST, 30); this.dob = cal.getTime(); System.out.println(dob) } 

It gives the following result:

 Mon Aug 30 15:08:14 CDT 1999 

but I expected an exit like: 08/30/1999

I want to implement without joda time library

Answer 1

Try changing the format:

 @DateTimeFormat(pattern = "dd/MM/yyyy") 

MM is in a few months, MM in a few minutes.

Take a look at this documentation :

The most common ISO format is DateTime yyyy-MM-dd'T'hh: mm: ss.SSSZ , for example.

Answer 2

I know this is an old question, but I answer, because today I have the same problem and I lost 4 hours of work to find a solution. The problem here is spring uses jackson to serialize and deserialize JSON. @DateTimeFormat annotation will not do the job, you have to tell Jackson how to serialize the date. You have two solutions: the first one is simpler and should use the @JsonFormat annotation in the getter method:

 @JsonFormat(shape=JsonFormat.Shape.STRING, pattern="dd/MM/yyyy") public Date getDob(){ return dob; } 

The second solution is to create your own serializer for the date fields, for example:

 public class JsonDateSerializer extends JsonSerializer<Date>{ private static final SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy"); @Override public void serialize(Date date, JsonGenerator gen, SerializerProvider provider) throws IOException, JsonProcessingException { String formattedDate = dateFormat.format(date); gen.writeString(formattedDate); } } 

and then use the annotation in the get method:

 @JsonSerialize(using=JsonDateSerializer.class) public Date getDob(){ return dob; } 

this link explains how to make a serializer

https://dzone.com/articles/how-serialize-javautildate

I had another problem: I imported classes from the org.codehaus.jackson package into my JsonDateSerializer class, but spring gave me this error:

 java.io.FileNotFoundException: class path resource [org/codehaus/jackson/map/JsonSerializer.class] cannot be opened because it does not exist 

So, I changed all the import data in the package

 com.fasterxml.jackson 

and everything works fine. Hope this can help someone.

Answer 3

You call System.out.println directly in the method of your class. It may not work like that.

You must call the dob field outside of your class, for example, from a JSP page. And thus, the field will be automatically formatted for this template.

Answer 4

Annotations

@NumberFormat and @DateTimeFormat only work in Spring MVC environment. You should use <mvc:annotation-driven/> in the xml mvc configuration file.

Answer 5

Take a look at your imports in your class. Your date type should be java.util.Date. It can be inheritance from another class, for example, java.sql.Date.