CXF JAXRS - How to pass Date as QueryParam

CXF JAXRS - How to pass Date as QueryParam

In Apache CXF JAX-RS (Java API for RESTful Web Services), you can pass a Date as a query parameter by using the @QueryParam annotation along with a custom ParamConverter. This approach allows you to convert a date string from the URL query parameter into a Date object. Here's how you can do it:

  • Define a custom ParamConverter for Date:
import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import javax.ws.rs.ext.ParamConverter; public class DateParamConverter implements ParamConverter<Date> { private final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); // Define your desired date format @Override public Date fromString(String value) { try { return dateFormat.parse(value); } catch (ParseException e) { throw new IllegalArgumentException("Invalid date format. Please use yyyy-MM-dd."); } } @Override public String toString(Date value) { return dateFormat.format(value); } }

In the fromString method, we parse the incoming date string using the specified date format, and in the toString method, we convert a Date object back to a string in the same format.

  • Register the custom ParamConverter with your CXF application:

You can register the custom ParamConverter in your CXF application by adding it to the list of providers or directly to the resource class.

Option A: Register as a provider globally in your CXF configuration:

import org.apache.cxf.jaxrs.provider.ServerProviderFactory; public class MyApplication extends javax.ws.rs.core.Application { public MyApplication() { // Register the custom ParamConverter globally ServerProviderFactory.getInstance().registerUserProvider(new DateParamConverter()); } }

Option B: Register as a provider in your resource class or method:

import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.QueryParam; import org.apache.cxf.jaxrs.ext.ParameterHandler; @Path("/myresource") public class MyResource { @GET public Response myMethod( @QueryParam("startDate") DateParam startDateParam ) { Date startDate = startDateParam.getValue(); // Your code here } }

In this example, we've registered the DateParamConverter either globally or within a specific resource class or method. Now, you can use the @QueryParam annotation with a parameter of type DateParam to accept a date as a query parameter in your resource method.

Remember to adjust the date format in the DateParamConverter to match the format you expect to receive in your query parameter.

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