服务等级
@Service
@RequestMapping(value = "employees")
public interface EmployeeService {
@RequestMapping(value = "{id}", method = RequestMethod.GET)
public @ResponseBody Employee getEmployee(@PathVariable("id") int employeeId) throws EmpException;
@RequestMapping(method = RequestMethod.GET)
public @ResponseBody List<Employee> getAllEmployees() throws EmpException;
@RequestMapping(method = RequestMethod.POST)
public @ResponseBody Employee createEmployee(@RequestBody Employee employee) throws EmpException;
@RequestMapping(value ="{id}", method = RequestMethod.DELETE)
public @ResponseBody UserInfo deleteEmployee(@PathVariable("id") int employeeId) throws EmpException;
@RequestMapping(value="{id}", method = RequestMethod.PUT)
public @ResponseBody Employee updateEmployee(@RequestBody Employee employee,@PathVariable("id") int employeeId) throws EmpException;
}
实现类
@Service("employeeService")
public class EmployeeServiceImpl implements EmployeeService {
@Autowired
private Employee employee;
private static final Logger logger = LoggerFactory.getLogger(EmployeeServiceImpl.class);
public Employee getEmployee(@PathVariable("id") int employeeId) throws EmpException {
logger.info("Start getEmployee. ID="+employeeId);
employee = employeeDao.getEmployee(employeeId);
if(employee != null) {
return employee;
} else {
throw new EmpException("ID: "+employeeId+" is not available");
}
}
}
在实现类中，我还使用了 @pathvariable 注释，然后只有employeeId 的值将从接口(interface)传递到实现，否则将出现空指针表达式。任何其他方式将值从接口(interface)传递到实现而不使用 @pathvariable 。
最佳答案
请求映射不在服务类上，而是在 Controller 上。
为此，您需要 @Controller annotation .
关于Spring MVC @pathvariable 注解不会将值从接口(interface)传递到实现，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23290822/