相关疑难解决方法(0)

有没有理由不将控制器映射为接口？

在所有示例和问题中,我看到周围的控制器,都是具体的类.是否有一个原因？我想将请求映射与实现分开.当我试图@PathVariable在我的具体课程中获得一个参数时,我碰到了一堵墙.

我的Controller界面如下所示:

@Controller
@RequestMapping("/services/goal/")
public interface GoalService {

    @RequestMapping("options/")
    @ResponseBody
    Map<String, Long> getGoals();

    @RequestMapping(value = "{id}/", method = RequestMethod.DELETE)
    @ResponseBody
    void removeGoal(@PathVariable String id);

}

而实施班:

@Component
public class GoalServiceImpl implements GoalService {

    /* init code */

    public Map<String, Long> getGoals() {
        /* method code */
        return map;
    }

    public void removeGoal(String id) {
        Goal goal = goalDao.findByPrimaryKey(Long.parseLong(id));
        goalDao.remove(goal);
    }

}

该getGoals()方法效果很好; 在removeGoal(String id)抛出一个异常

ExceptionHandlerExceptionResolver - Resolving exception from handler [public void
    todo.webapp.controllers.services.GoalServiceImpl.removeGoal(java.lang.String)]: …