Question

在我的Spring MVC webapp中，我有一个用于CRUD操作的通用RESTful控制器。并且每个具体控制器必须仅声明@RequestMapping，例如/foo。通用控制器处理了对/foo和/foo/{id}的所有请求。

但现在我需要编写一个更复杂的CRUD控制器，它将获得额外的请求参数或路径变量，例如/foo/{date}和/foo/{id}/{date}。所以我扩展了我的通用CRUD控制器并编写了重载的fetch(id, date)方法，该方法将处理{id}和{date}。这不是问题。

但我还需要“禁用”从基类派生的fetch(id)实现（资源不能再在/foo/{id}处可用，只能在/foo/{id}/{date}）。我想出的唯一想法是在我的具体控制器中覆盖此方法，将其映射到假uri并返回null。但这看起来像是丑陋的脏黑客，因为我们暴露了一些假的资源uri，而不是禁用它。可能有更好的做法吗？

有什么想法吗？

//My generic CRUD controller
public abstract class AbstractCRUDControllerBean<E, PK extends Serializable> implements AbstractCRUDController<E, PK> {

  @RequestMapping(method=RequestMethod.GET)
  public @ResponseBody ResponseEntity<E[]> fetchAll() { ... }

  @RequestMapping(value="/{id}", method=RequestMethod.GET)
  public @ResponseBody ResponseEntity<E> fetch(@PathVariable("id") PK id) { ... }

  @RequestMapping(method=RequestMethod.POST)
  public @ResponseBody ResponseEntity<E> add(@RequestBody E entity) { ... }

  @RequestMapping(value="/{id}", method=RequestMethod.PUT)
  public @ResponseBody ResponseEntity<E> update(@PathVariable("id") PK id, @RequestBody E entity) { ... }

  @RequestMapping(value="/{id}", method=RequestMethod.DELETE)
  public @ResponseBody ResponseEntity<E> remove(@PathVariable("id") PK id) { .. }
}

//Concrete controller, working with Foo entities
@Controller
@RequestMapping("/foo")
public class FooControllerImpl extends
        AbstractCRUDControllerBean<Foo, Long> implements FooController { 

  //ugly overriding parent's method
  @RequestMapping(value="/null",method=RequestMethod.GET)
  public @ResponseBody ResponseEntity<Foo> fetch(@PathVariable("id") PK id) { 
    return null;
  }

  //new fetch implementation
  @RequestMapping(value="/{id}/{date}", method=RequestMethod.GET)
  public @ResponseBody ResponseEntity<Foo> fetch(@PathVariable("id") PK id, @PathVariable("date") Date date) { .... }

}

Answer 1

您是否尝试使用弹簧来实现资源，子资源类型的球衣？这可能不是直接可能的。而不是将通用RESTful服务声明为控制器，为什么不将它委托给它们？

//My generic CRUD Operations
public abstract class AbstractCRUDControllerBean<E, PK extends Serializable> implements AbstractCRUDController<E, PK> {

  public ResponseEntity<E[]> fetchAll() { ... }

  public ResponseEntity<E> fetch(@PathVariable("id") PK id) { ... }

  public ResponseEntity<E> add(@RequestBody E entity) { ... }

  public ResponseEntity<E> update(@PathVariable("id") PK id, @RequestBody E entity) { ... }

  public ResponseEntity<E> remove(@PathVariable("id") PK id) { .. }
}

并在控制器中委派。

//Concrete controller, working with Foo entities
@Controller
@RequestMapping("/foo")
public class FooControllerImpl extends
        AbstractCRUDControllerBean<Foo, Long> implements FooController { 

  //we are interested in using fetchall but not others
  @RequestMapping(method=RequestMethod.GET)
  public @ResponseBody ResponseEntity<Foo> fetch(@PathVariable("id") PK id) { 
    return fetchAll();
  }

  //fetch with id and date
  @RequestMapping(value="/{id}/{date}", method=RequestMethod.GET)
  public @ResponseBody ResponseEntity<Foo> fetch(@PathVariable("id") PK id, @PathVariable("date") Date date) { .... }

}

另外，您也可以根据参数的可用性来映射方法，

@RequestMapping(value="/{id}/{date}", params={"param1","param2","!param3"})
public @ResponseBody ResponseEntity<E> customFetch(@PathVariable("id") PK id, 
            @PathVariable("date") Date date, @RequestParam("param1") String param1,                
            @RequestParam("param2") String param2) {...}

当param1和param2存在且param3不存在时，此方法映射/ foo / id / date。

Spring MVC控制器继承和路由

1 个答案: