SAP发布REST/HTTP接口

1.SE24新建类：ZCL_REST_QUERY

激活，然后添加interface:IF_HTTP_EXTENSION并激活。

2.实现IF_HTTP_EXTENSION~HANDLE_REQUEST：

  METHOD IF_HTTP_EXTENSION~HANDLE_REQUEST.
    DATA: LT_FIELDS       TYPE TIHTTPNVP,
          LV_HEADER_QUERY TYPE STRING,
          LV_DATA         TYPE STRING,
          LV_HTML         TYPE STRING.

    FIELD-SYMBOLS: <FS_FIELD>       LIKE LINE OF LT_FIELDS.

*" get HEADER fields
    SERVER->REQUEST->GET_HEADER_FIELDS(
        CHANGING
          FIELDS = LT_FIELDS    " Header fields
      ).
    LV_DATA = SERVER->REQUEST->IF_HTTP_ENTITY~GET_CDATA( ).

    " Read the fields table and look for name "~query_string" -- this will contain the URL query
    READ TABLE LT_FIELDS
      WITH KEY NAME = '~query_string'
      ASSIGNING <FS_FIELD>.
    IF SY-SUBRC EQ 0.
      CONCATENATE '{"message": "You have entered'
                  <FS_FIELD>-VALUE
                  'as query parameter."}'
             INTO LV_HTML SEPARATED BY SPACE.

*" Output to HTML
      SERVER->RESPONSE->SET_CDATA(
        EXPORTING
          DATA   = LV_HTML    " Character data
*        offset = 0    " Offset into character data
*        length = -1    " Length of character data
      ).
    ENDIF.
  ENDMETHOD.

3.事务代码SICF定义REST服务：

设置服务的用户名密码：

添加处理类：

保存激活.测试服务：

SAP调用测试：

 创建程序：ZLYTEST_REST

REPORT zlytest_rest.
DATA: lo_http_client   TYPE REF TO if_http_client,
      lv_service       TYPE string,
      lv_request       TYPE string,
      lv_len           TYPE i,
      lv_result        TYPE string,
      lx_result        TYPE xstring,
      lo_ixml          TYPE REF TO if_ixml,
      lo_streamfactory TYPE REF TO if_ixml_stream_factory,
      lo_istream       TYPE REF TO if_ixml_istream,
      lo_document      TYPE REF TO if_ixml_document,
      conv             TYPE REF TO cl_abap_conv_in_ce,
      lo_parser        TYPE REF TO if_ixml_parser.
lv_service = 'http://gjyxcrmdev.crm.hisense.com:8000/sap/zrest'.

lv_request = '<Request><Id>2912744</Id><Notes>testaskldjasd123</Notes><FaultSource>consumer</FaultSource>' &&
'<FaultBattery>no</FaultBattery>' &&
'<FaultScreen>no</FaultScreen>' &&
'<FaultFirmware>no</FaultFirmware>' &&
'<FaultLogicboard>no</FaultLogicboard>' &&
'<FaultKeyboard>no</FaultKeyboard>' &&
'<FaultSpeaker>no</FaultSpeaker>' &&
'<FaultHdd>no</FaultHdd>' &&
'<FaultPowersupply>no</FaultPowersupply>' &&
'<FaultOtherDescription>123</FaultOtherDescription>'
 && '</Request>'.
lv_len = strlen( lv_request ).

cl_http_client=>create_by_url(
  EXPORTING
    url                = lv_service
  IMPORTING
    client             = lo_http_client
  EXCEPTIONS
    argument_not_found = 1
    plugin_not_active  = 2
    internal_error     = 3
    OTHERS             = 4 ).

*lo_http_client->authenticate(
*    username             = 'service@hisenseinhome.com.au'
*    password             = 'pass' ).

CALL METHOD lo_http_client->request->set_cdata
  EXPORTING
    data   = lv_request
    offset = 0
    length = lv_len.

lo_http_client->send(
  EXCEPTIONS
    http_communication_failure = 1
    http_invalid_state         = 2 ).

lo_http_client->receive(
  EXCEPTIONS
    http_communication_failure = 1
    http_invalid_state         = 2
    http_processing_failed     = 3 ).

CLEAR lv_result .
lx_result = lo_http_client->response->get_data( ).
CALL METHOD lo_http_client->close.
CHECK 1 = 1.

在REST处理类中添加断点，执行测试程序，测试结果如下：

 数据已经传递过来了。

返回JSON数据格式例子：

    DATA: lo_json_ser TYPE REF TO cl_trex_json_serializer,
          lo_json_des TYPE REF TO cl_trex_json_deserializer.
    DATA: json_string TYPE string.
    DATA:gt_t005u TYPE TABLE OF t005u.
"设置返回数据格式
CALL METHOD server->response->if_http_entity~set_content_type
      EXPORTING
        content_type = 'application/json'.
SELECT * INTO TABLE gt_t005u FROM t005u UP TO 5 ROWS WHERE spras = '1' AND land1 = 'CN'.

      CREATE OBJECT lo_json_ser
        EXPORTING
          data = gt_t005u[].

      CALL METHOD lo_json_ser->serialize.
      CALL METHOD lo_json_ser->get_data
        RECEIVING
          rval = json_string.
server->response->set_cdata(
        EXPORTING
          data   = json_string    " Character data
      ).

返回结果：

参考别人的：

  METHOD IF_HTTP_EXTENSION~HANDLE_REQUEST.
    DATA: LO_JSON_SER TYPE REF TO CL_TREX_JSON_SERIALIZER,
          LO_JSON_DES TYPE REF TO CL_TREX_JSON_DESERIALIZER.
    DATA: JSON_STRING TYPE STRING.
    DATA:GT_T005U TYPE TABLE OF T005U.
    DATA:GW_T005U TYPE T005U.
    DATA:LV_METHOD TYPE STRING.

    LV_METHOD = SERVER->REQUEST->GET_HEADER_FIELD( NAME = '~request_method' ).

    CASE LV_METHOD.
      WHEN 'GET'.
        SELECT * INTO TABLE GT_T005U FROM T005U UP TO 5 ROWS WHERE SPRAS = '1' AND LAND1 = 'CN'.

        CREATE OBJECT LO_JSON_SER
          EXPORTING
            DATA = GT_T005U[].

        CALL METHOD LO_JSON_SER->SERIALIZE.

        CALL METHOD LO_JSON_SER->GET_DATA
          RECEIVING
            RVAL = JSON_STRING.

        CALL METHOD SERVER->RESPONSE->SET_CDATA(
          EXPORTING
            DATA = JSON_STRING ).
        SERVER->RESPONSE->SET_STATUS( CODE = 200 REASON = 'OK' ).
      WHEN 'POST' OR 'PUT'.
        JSON_STRING = SERVER->REQUEST->IF_HTTP_ENTITY~GET_CDATA( ).
        CREATE OBJECT LO_JSON_DES.
        CALL METHOD LO_JSON_DES->DESERIALIZE(
          EXPORTING
            JSON = JSON_STRING
          IMPORTING
            ABAP = GW_T005U ).
        SERVER->RESPONSE->SET_STATUS( CODE = 200 REASON = 'OK' ).

*        MODIFY GT_T005U FROM GW_T005U.

      WHEN 'DELETE'.
      WHEN OTHERS.
    ENDCASE.

    CALL METHOD SERVER->RESPONSE->IF_HTTP_ENTITY~SET_CONTENT_TYPE
      EXPORTING
        CONTENT_TYPE = 'application/json'.


  ENDMETHOD.