I want to display a Google Chart (Line Chart) on .jsp page of my Spring MVC application. The data is retrieved from a MySQL database, so I need to convert the YYYY-MM-DD HH:MM:SS
format into Javascript's Date.
The database is created by Hibernate. The Reading
entity has a time
field of type java.sql.Timestamp
, which is stored as DATETIME
in the database.
The results
is an Iterable<Reading>
object passed to the .jsp via controller. It is passed correctly (I am displaying the data as a table, too).
I'm trying to use the solution proposed here , but it does not work.
Here's the code I'm trying to populate the chart with:
<c:forEach items="${results}" var="reading">
var t = "${reading.time}".split(/[- :]/);
var d = new Date(t[0], t[1]-1, t[2], t[3], t[4], t[5]);
data.addRow([d,${reading.temperature}]);
</c:forEach>
The chart is not displaying.
Facts:
java.sql.Timestamp
is a subclass of java.util.Date
. <fmt:formatDate>
for converting java.util.Date
to String
. Date
constructor can take ao a string in ISO8601 time format. Put together:
<c:forEach items="${results}" var="reading">
<fmt:formatDate var="time" value="${reading.time}" pattern="yyyy-MM-dd'T'HH:mm:ss" timeZone="UTC" />
var d = new Date("${time}");
// ...
</c:forEach>
Alternatively, just convert results
to JSON using a decent JSON formatter in the controller and print it as if it's a JS variable like so var data = ${data};
. See also ao How to access array of user defined objects within <script> in JSP?
Unrelated to the concrete problem: make sure your model is of java.util.Date
type. You shouldn't have java.sql.*
typed properties in your model. If you're using plain JDBC, just upcast ResultSet#getTimestamp()
to java.util.Date
directly. See also ao Handling MySQL datetimes and timestamps in Java .
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