Spring框架。根据请求参数在运行时注入bean

public interface UserService {
    void doSomething();
}

@Service("userServiceA")
public class UserServiceImplA implements UserService {
    @Override
    public void doSomething() {
        System.out.println("Doing something in UserServiceImplA");
    }
}

@Service("userServiceB")
public class UserServiceImplB implements UserService {
    @Override
    public void doSomething() {
        System.out.println("Doing something in UserServiceImplB");
    }
}

@RestController
public class UserController {

    @Autowired
    private ApplicationContext context;

    @GetMapping("/doSomething")
    public String doSomething(@RequestParam String userServiceType) {
        UserService userService;
        if ("A".equals(userServiceType)) {
            userService = context.getBean("userServiceA", UserService.class);
        } else if ("B".equals(userServiceType)) {
            userService = context.getBean("userServiceB", UserService.class);
        } else {
            throw new IllegalArgumentException("Unknown user service type");
        }
        userService.doSomething();
        return "Done";
    }
}

@GetMapping("/doSomething")
public String doSomething(@RequestParam @Validated(ValidUserServiceType.class) String userServiceType) {
    // ... 使用userServiceType获取bean并执行操作
}