【DDD】领域驱动设计实践 —— UI层如何实现

 1 public class BaseController {
 2 
 3     private static Logger logger = LogManager.getLogger(BaseController.class);
 4     
 5     @Autowired
 6     private ApplicationUtil applicationUtil;
 7     
 8     @Autowired
 9     private ExceptionHandler exceptionHandler;
10 
11     /**
12      * format 失败 response。
13      * @param e
14      * @return
15      */
16     protected ResponseDto formatErrorResponse(final Exception e) {
17         ResponseDto responseDto = new ResponseDto();
18         //将response 的data body置为空
19         responseDto.setBody(null);
20 
21         //依据异常类型进行分别处理，将异常信息转义为用户友好的提示信息
22         Map<String, String> exceptionMap = exceptionHandler.handle(e);
23         responseDto.setReturnCode(exceptionMap.get("errorCode"));
24         responseDto.setReturnMsg(exceptionMap.get("errorMsg"));
25         logger.debug("Response is: "+responseDto);
26         return responseDto;
27     }
28     
29     
30     /**
31      * format成功的response
32      * @param responseBody
33      * @return ResponseDto
34      */
35     protected ResponseDto formatSuccessResponse(ResponseBody responseBody) {
36         ResponseDto responseDto = new ResponseDto();
37         //设置返回码和返回信息为成功
38         responseDto.setReturnCode(ReturnCode.SUCCESS);
39         responseDto.setReturnMsg(applicationUtil.getReturnMsg(ReturnCode.SUCCESS));
40         
41         //将response 的data body置为实际的业务body
42         responseDto.setBody(responseBody);
43         logger.debug("Response is: "+responseDto);
44         return responseDto;
45     }
46     
47     
48 }

 1 @Controller
 2 @RequestMapping("/post")
 3 public class PostController extends BaseController {
 4     
 5     @Autowired
 6     private PostService postService;
 7 
 8     /**
 9      *  发布帖子
10      * @param requestDto
11      * @return  ResponseDto
12      */
13     @ResponseBody
14     @RequestMapping(value = "/posting", method = RequestMethod.POST)
15     public ResponseDto posting(@RequestBody @Valid RequestDto<PostingReqBody> requestDto) {
16         try {
17             PostingRespBody postingRespBody = postService.posting (requestDto);
18             return this.formatSuccessResponse(postingRespBody);
19         } catch (Exception e) {
20             return this.formatErrorResponse(e);
21         }
22     }
23     .......
24 }

1 /**
2  * User Interface layer Data Transfer Object
3  * @author daoqidelv
4  * @createdate 2017年9月24日
5  */
6 public interface UIDto {
7 
8 }

 1 public class RequestDto<T> implements UIDto {
 2     
 3     /**
 4      * 请求渠道
 5      */
 6     private String channel;
 7     
 8     /**
 9      * 请求id
10      */
11     private String requestId;
12     
13     /**
14      * 对body使用validation
15      */
16     @Valid 
17     private T body;
18 
19     public String getChannel() {
20         return channel;
21     }
22 
23     public void setChannel(String channel) {
24         this.channel = channel;
25     }
26 
27     public String getRequestId() {
28         return requestId;
29     }
30 
31     public void setRequestId(String requestId) {
32         this.requestId = requestId;
33     }
34 
35 
36     public T getBody() {
37         return body;
38     }
39 
40     public void setBody(T body) {
41         this.body = body;
42     }
43     
44 }

 1 public class ResponseDto implements UIDto{
 2     
 3     /**
 4      * 状态码
 5      */
 6     private String returnCode;
 7 
 8     /**
 9      * 提示信息
10      */
11     private String returnMsg;
12 
13     /**
14      * 各个接口返回的数据
15      */
16     private Object body;
17 
18     public String getReturnCode() {
19         return returnCode;
20     }
21 
22     public void setReturnCode(String returnCode) {
23         this.returnCode = returnCode;
24     }
25 
26     public String getReturnMsg() {
27         return returnMsg;
28     }
29 
30     public void setReturnMsg(String returnMsg) {
31         this.returnMsg = returnMsg;
32     }
33 
34     public Object getBody() {
35         return body;
36     }
37 
38     public void setBody(Object body) {
39         this.body = body;
40     }
41     
42 }

1 public class RequestBody {
2 
3 }

1 public class ResponseBody {
2 
3 }

public class PostingReqBody extends RequestBody {

    @NotEmpty(message="{request.userId.not.empty}")
    private String userId;
    
    private String title;
    
    @NotEmpty(message="{request.post.posting.content.not.empty}")
    private String sourceContent;

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getSourceContent() {
        return sourceContent;
    }

    public void setSourceContent(String sourceContent) {
        this.sourceContent = sourceContent;
    }  

}

 1 public class PostingRespBody extends ResponseBody {
 2     
 3     private String postId;
 4 
 5     public String getPostId() {
 6         return postId;
 7     }
 8 
 9     public void setPostId(String postId) {
10         this.postId = postId;
11     }
12 }