RESTful Web Service Demo

package com.rest.resource; import java.util.List; import javax.ws.rs.Consumes; import javax.ws.rs.DELETE; import javax.ws.rs.GET; import javax.ws.rs.POST; import javax.ws.rs.PUT; import javax.ws.rs.Path; import javax.ws.rs.PathParam; import javax.ws.rs.Produces; import javax.ws.rs.WebApplicationException; import javax.ws.rs.core.Response; import javax.ws.rs.core.Response.ResponseBuilder; import javax.ws.rs.core.Response.Status; import com.rest.pojo.Customer; import com.rest.service.CustomerService; @Path("customers") @Produces("application/json;charset=UTF-8") @Consumes("application/json;charset=UTF-8") public class Customers { private CustomerService customerService = new CustomerService(); public CustomerService getCustomerService() { return customerService; } public void setCustomerService(CustomerService customerService) { this.customerService = customerService; } @GET public List<Customer> getCustomers() { System.out.println("getCustomers called"); List<Customer> customers = (List<Customer>) getCustomerService().getCustomers(); if (customers == null) { System.out.println("getCustomers null"); ResponseBuilder builder = Response.status(Status.BAD_REQUEST); builder.type("application/json"); builder.entity("<error>Customers Not Found</error>"); throw new WebApplicationException(builder.build()); } else { System.out.println("getCustomers"); return customers; } } @GET @Path("/{id}") public Customer getCustomerById(@PathParam("id") String id) { System.out.println("getCustomerById called with customer's id: " + id); Customer customer = (Customer) getCustomerService().getCustomerById(id); if (customer == null) { ResponseBuilder builder = Response.status(Status.NOT_FOUND); builder.type("application/json"); builder.entity("<error>Customer Not Found</error>"); throw new WebApplicationException(builder.build()); } else { System.out.println("getCustomer"); return customer; } } @POST public Customer insertCustomer(Customer customer){ System.out.println("insertCustomer called"); Customer cust = (Customer) getCustomerService().getCustomerById(customer.getId()); if (cust != null) { throw new WebApplicationException(Response.status(Status.BAD_REQUEST).build()); } else { getCustomerService().insertCustomer(customer); return customer; } } @DELETE @Path("/{id}") public Customer deleteCustomer(@PathParam("id") String id){ System.out.println("deleteCustomer with customer's id : " + id); Customer customer = (Customer) getCustomerService().getCustomerById(id); if (customer == null) { throw new WebApplicationException(Response.status(Status.NOT_FOUND).build()); } else { getCustomerService().deleteCustomer(id); return customer; } } @PUT @Path("/{id}") public Customer updateCustomer(@PathParam("id") String id, Customer customer) { System.out.println("updateStudent with customer's id : "+ id); Customer cust = (Customer) getCustomerService().getCustomerById(id); if (cust == null) { throw new WebApplicationException(Response.status(Status.NOT_FOUND).build()); } else { getCustomerService().updateCustomer(customer); return customer; } } }