Jersey method selection by query parameters

Question

I need to implement a webservice that uses the first query parameter to identify the operation, i.e. the client call would be something like: http://localhost:8080/ws/oper

Answer 1

I see this is already answered, but I had a similar problem and achieved a solution using sub-resources.

package com.example.ws;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.QueryParam;

@Path("/")
public class Operation {

    @Path("/")
    public Object sub(@QueryParam("operation") String operation)
    {
       if ("info".equals(operation))
          return new InfoOp();
       if ("create".equals(operation))
          return new CreateOp();
       //handle via error code
    }

    public class InfoOp {
        @GET 
        public String info() {
            return "info";
        }
    }

    public class CreateOp {
        @GET 
        public String create(@QueryParam("name") String name) {
            return "create: " + name;
        }
    }
}