4.SAP ECC上创建Restful服务并供外围系统调用

SAP 系统上可以发布一个restful API并可以让外部系统调用。 

1. 创建类ZCL_REST_01

接口： IF_HTTP_EXTENSION

 在IF_HTTP_EXTENSION~HANDLE_REQUEST 方法中接收Http request请求，并发送http response:

例子：

METHOD IF_HTTP_EXTENSION~HANDLE_REQUEST.


  TYPES: BEGIN OF TY_INPUT,
              ROWS TYPE I,
            END OF TY_INPUT.

  DATA: L_INPUT TYPE TY_INPUT.

  DATA: I_STRING TYPE STRING,
        O_STRING TYPE STRING.
  DATA: LT_SFLIGHT TYPE TABLE OF SFLIGHT.

  "Get Importing Json
  I_STRING = SERVER->REQUEST->IF_HTTP_ENTITY~GET_CDATA( )."

  "Deserialize Json to data
  ZUI2_CL_JSON=>DESERIALIZE( EXPORTING JSON = I_STRING CHANGING DATA = L_INPUT ).

  "Get Return Data
  SELECT *
    FROM SFLIGHT
    INTO TABLE LT_SFLIGHT
    UP TO 10 ROWS.

  "Serialize Data to Json
  O_STRING = ZUI2_CL_JSON=>SERIALIZE( LT_SFLIGHT ).

  "Set the return data format
  CALL METHOD SERVER->RESPONSE->IF_HTTP_ENTITY~SET_CONTENT_TYPE
    EXPORTING
      CONTENT_TYPE = 'application/json'.

  "set exporting data
  SERVER->RESPONSE->SET_CDATA(
  EXPORTING
  DATA   = O_STRING ).

ENDMETHOD.

2. 创建SICF服务，生成URL，可以指定匿名访问的账号

已经生成的服务z_rest_01，服务是通过‘创建主机/服务’创建出来的，比较简单

把第一步中建的类zcl_rest_01 放到处理器中：

右键点击可以测试该服务：

测试服务，可以获取服务的URL

3： 测试该服务是否可用：

*&---------------------------------------------------------------------*
*& Report  ZZZZZZ3
*&
*&---------------------------------------------------------------------*
*&   自己写一个zcl_rest_01  做测试
*&
*&---------------------------------------------------------------------*

REPORT ZZZZZZ4.

DATA: LO_HTTP_CLIENT TYPE REF TO IF_HTTP_CLIENT,
       LO_REST_CLIENT TYPE REF TO CL_REST_HTTP_CLIENT,
       LV_URL         TYPE        STRING,
       LV_HTTP_STATUS TYPE        STRING,
       LV_BODY        TYPE        STRING.

DATA:  LV_SIGN     TYPE STRING,
       LV_KEY      TYPE STRING ,
       LV_HASH_MD5 TYPE HASH160.
DATA LV_USERNAME TYPE STRING.
DATA LV_PASSWORD TYPE STRING.
TYPES: BEGIN OF TY_JSON_REQ,
         USERNAME TYPE STRING ,
         PWD      TYPE STRING ,
         MSG      TYPE STRING ,
         MOBILE   TYPE STRING ,
         MARK     TYPE STRING ,
         MSGTYPE  TYPE STRING ,
         SIGN     TYPE STRING,
       END OF TY_JSON_REQ.
DATA: LS_JSON_REQ TYPE TY_JSON_REQ.
DATA: LO_JSON           TYPE REF TO CL_CLB_PARSE_JSON,
      LO_RESPONSE       TYPE REF TO IF_REST_ENTITY ,
      LO_REQUEST        TYPE REF TO IF_REST_ENTITY ,
      LO_SQL            TYPE REF TO CX_SY_OPEN_SQL_DB ,
      LV_STATUS         TYPE  STRING ,
      LV_REASON         TYPE  STRING ,
      LV_RESPONSE       TYPE  STRING ,
      LV_CONTENT_LENGTH TYPE  STRING,
      LV_LOCATION       TYPE  STRING ,
      LV_CONTENT_TYPE   TYPE  STRING ,
      LV_STATUS2        TYPE  I.
DATA: LV_TOKEN_NUMBER TYPE STRING.
DATA LR_JSON_SERIALIZER   TYPE REF TO CL_TREX_JSON_SERIALIZER.
DATA: LV_RESPONSE_MSG    TYPE STRING,
      LV_RESPONSE_RESULT TYPE STRING,
      LV_DUMMY1          TYPE STRING ,
      LV_DUMMY2          TYPE STRING .

LV_URL = 'http://edq.expr.com:8000/z_rest_01?sap-client=200'.

"Create HTTP Client
CL_HTTP_CLIENT=>CREATE_BY_URL(
 EXPORTING
   URL              = LV_URL    " Logical destination (specified in function call)
 IMPORTING
   CLIENT                   = LO_HTTP_CLIENT    " HTTP Client Abstraction
 EXCEPTIONS
   ARGUMENT_NOT_FOUND       = 1
   PLUGIN_NOT_ACTIVE        = 2
   INTERNAL_ERROR           = 3
   OTHERS                   = 4
).

IF SY-SUBRC <> 0.
  RETURN .
ENDIF.

* If you are using cl_http_client=>create_by_url use this code to supress and pass your
* HTTP basic authenication
LO_HTTP_CLIENT->PROPERTYTYPE_LOGON_POPUP = LO_HTTP_CLIENT->CO_DISABLED .

LV_USERNAME = 'SAPLOGONID'.
LV_PASSWORD = 'Abcd1234'.

CALL METHOD LO_HTTP_CLIENT->AUTHENTICATE
  EXPORTING
    USERNAME = LV_USERNAME
    PASSWORD = LV_PASSWORD.

CREATE OBJECT LO_REST_CLIENT
  EXPORTING
    IO_HTTP_CLIENT = LO_HTTP_CLIENT.

LO_HTTP_CLIENT->REQUEST->SET_VERSION( IF_HTTP_REQUEST=>CO_PROTOCOL_VERSION_1_0 ).

IF LO_HTTP_CLIENT IS BOUND AND LO_REST_CLIENT IS BOUND.
  CL_HTTP_UTILITY=>SET_REQUEST_URI(
    EXPORTING
      REQUEST = LO_HTTP_CLIENT->REQUEST    " HTTP Framework (iHTTP) HTTP Request
      URI     = LV_URL                     " URI String (in the Form of /path?query-string)
  ).
ELSE.
  RETURN .
ENDIF.

"message convert to Json
CREATE OBJECT LR_JSON_SERIALIZER
  EXPORTING
    DATA = LS_JSON_REQ.
LR_JSON_SERIALIZER->SERIALIZE( ).
LV_BODY = LR_JSON_SERIALIZER->GET_DATA( ).

* Or you can use this class as well

* lv_body = /ui2/cl_json=>serialize( data = json_req ).
* Converted JSON should look like this
 lv_body = '{ "salesorder":"25252525", "type":"Direct"}'.  "随便给一个

* Set Payload or body ( JSON or XML)
LO_REQUEST = LO_REST_CLIENT->IF_REST_CLIENT~CREATE_REQUEST_ENTITY( ).
LO_REQUEST->SET_CONTENT_TYPE( IV_MEDIA_TYPE = IF_REST_MEDIA_TYPE=>GC_APPL_JSON ).
LO_REQUEST->SET_STRING_DATA( LV_BODY ).

lv_token_number = '32d95891358e02e9abdaf6c9cfb01e9e'.

CALL METHOD LO_REST_CLIENT->IF_REST_CLIENT~SET_REQUEST_HEADER
  EXPORTING
    IV_NAME  = 'appkey'
    IV_VALUE = LV_TOKEN_NUMBER. "Set your header .

* POST  Now !!!!!!!!!!!!!

LO_REST_CLIENT->IF_REST_RESOURCE~POST( LO_REQUEST ).

* Collect response
LO_RESPONSE = LO_REST_CLIENT->IF_REST_CLIENT~GET_RESPONSE_ENTITY( ).
LV_HTTP_STATUS = LV_STATUS = LO_RESPONSE->GET_HEADER_FIELD( '~status_code' ).
LV_REASON = LO_RESPONSE->GET_HEADER_FIELD( '~status_reason' ).
LV_CONTENT_LENGTH = LO_RESPONSE->GET_HEADER_FIELD( 'content-length' ).
LV_LOCATION = LO_RESPONSE->GET_HEADER_FIELD( 'location' ).
LV_CONTENT_TYPE = LO_RESPONSE->GET_HEADER_FIELD( 'content-type' ).
LV_RESPONSE = LO_RESPONSE->GET_STRING_DATA( ).

BREAK-POINT.

debug可以看到返回正确的数据：

如果post时需要传出参数，在IF_HTTP_EXTENSION~HANDLE_REQUEST中读取下http request就可以。

4. 参考了一些链接，具体没有记下来。

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