我的Web应用程序存在一个小问题：一个与spring boot API连接的angular2应用程序。
我无法从angular2应用访问我的请求。我收到此错误：
Failed to load http://localhost:8080/deliveryMan/: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access.
Java代码：
@RestController
@RequestMapping(value = "/deliveryMan")
@CrossOrigin
public class DeliveryManController {
@Autowired
DeliveryManService deliveryManService;
@RequestMapping(value = "/getAllDeliveryMan", method = RequestMethod.GET)
public Iterable<DeliveryMan> getAllDeliveryMan(){
return deliveryManService.findAll();
}
@RequestMapping(method = RequestMethod.PUT, consumes = "application/json")
public DeliveryMan addDeliveryMan(@RequestBody DeliveryMan deliveryMan) throws InvalidObjectException {
deliveryManService.save(deliveryMan);
return deliveryMan;
}
@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan
public class MyApp{
public static void main(String[] args) {
SpringApplication.run(MyApp.class, …