SAP HTTP调用其他系统接口
1业务说明
ABAP系统通过HTTP方式调用其他系统发布的接口
2代码实现
2.1认证接口
根据访问的URL创建HTTP客户端
设置访问方式，并调用SEND和接收函数
有时需要专门验证用户名密码
获取返回的HTTP访问状态和状态描述，并关闭接口
其中定义的接收内表需要按照JSON结构来定义
2.2具体接口
当获取TOKEN成功之后，就可以继续执行后续的某个业务功能接口了
仍然根据访问的接口URL创建HTTP客户端
设置传输格式，校验权限，访问方式
根据传入JSON，定义内表，并转换为JSON格式
同理，调用发送和接收函数，之后用相同方式获取返回的JSON数据，并将其转换为内表，做后续操作，方法和认证接口处理一致，不再赘述。
2.3补充
当调用x-www-form-urlencoded类型的链接时，设置头格式
将传输参数通过&拼接起来
在POSTMAN中，调用时自动将参数进行urlencode转换，调用如果需要，可以如上使用方法转换
lv_time_64 = cl_http_utility=>escape_url( timestamp ).
2.4源代码
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"TOKEN的结构 TYPES: BEGIN OF TY_TOKEN, ACCESS_TOKEN TYPE STRING, TOKEN_TYPE TYPE STRING, REFRESH_TOKEN TYPE STRING, EXPIRES_IN TYPE STRING, SCOPE TYPE STRING, END OF TY_TOKEN. "发送数据时的结构 DATA:BEGIN OF TY_DATILDATA OCCURS 0, DATEFROM TYPE STRING, DATETO TYPE STRING, PAGE TYPE STRING, SIZE TYPE STRING, END OF TY_DATILDATA. "编辑发送数据 DATA: BEGIN OF TY_SENDDATA, PAYLOAD LIKE TY_DATILDATA, END OF TY_SENDDATA. "编辑接收数据 DATA: BEGIN OF TY_RECEIVEDATA, PAYLOAD LIKE TY_DATILDATA, DATA LIKE TABLE OF TY_DATILDATA, END OF TY_RECEIVEDATA. DATA:LS_TOKEN TYPE TY_TOKEN, LS_SENDDATA LIKE TY_SENDDATA, LS_RECDATA LIKE TY_RECEIVEDATA. DATA: LV_LEN TYPE I, "发送报文长度 LV_URL TYPE STRING, "接口地址 LO_HTTP_CLIENT TYPE REF TO IF_HTTP_CLIENT, "http客户端 LV_SEND_JSON TYPE STRING, "发送的JSON LV_REC_JSON TYPE STRING, "接收的JSON LV_AUTHORIZATION TYPE STRING, LV_CODE TYPE I, "HTTP 返回状态 LV_REASON TYPE STRING. " HTTP 状态描述 START-OF-SELECTION. CLEAR:LV_URL. LV_URL = 'https://hostname/oauth/oauth/token'. "创建http客户端 CALL METHOD CL_HTTP_CLIENT=>CREATE_BY_URL EXPORTING URL = LV_URL IMPORTING CLIENT = LO_HTTP_CLIENT EXCEPTIONS ARGUMENT_NOT_FOUND = 1 PLUGIN_NOT_ACTIVE = 2 INTERNAL_ERROR = 3 OTHERS = 4. "不显示登录界面 LO_HTTP_CLIENT->PROPERTYTYPE_LOGON_POPUP = LO_HTTP_CLIENT->CO_DISABLED. "可以使用AUTHENTICATE方法专门验证用户名和密码，但本程序不适用 * DATA LV_USERNAME TYPE STRING. * DATA LV_PASSWORD TYPE STRING. * Lv_USERNAME = '1234567'. * Lv_PASSWORD = '1234567'. * CALL METHOD LO_HTTP_CLIENT->AUTHENTICATE * EXPORTING * USERNAME = Lv_USERNAME * PASSWORD = Lv_PASSWORD. "设置http method 为POST LO_HTTP_CLIENT->REQUEST->SET_METHOD( IF_HTTP_REQUEST=>CO_REQUEST_METHOD_POST ). "IF_HTTP_ENTITY~CO_REQUEST_METHOD_GET "发送 CALL METHOD LO_HTTP_CLIENT->SEND EXCEPTIONS HTTP_COMMUNICATION_FAILURE = 1 HTTP_INVALID_STATE = 2 HTTP_PROCESSING_FAILED = 3 HTTP_INVALID_TIMEOUT = 4 OTHERS = 5. "接收 CALL METHOD LO_HTTP_CLIENT->RECEIVE EXCEPTIONS HTTP_COMMUNICATION_FAILURE = 1 HTTP_INVALID_STATE = 2 HTTP_PROCESSING_FAILED = 3. "提取返回字符串 CLEAR:LV_CODE,LV_REASON. CALL METHOD LO_HTTP_CLIENT->RESPONSE->GET_STATUS IMPORTING CODE = LV_CODE REASON = LV_REASON. "获取返回的JSON CLEAR:LV_REC_JSON,LS_TOKEN. LV_REC_JSON = LO_HTTP_CLIENT->RESPONSE->GET_CDATA( ). /UI2/CL_JSON=>DESERIALIZE( EXPORTING JSON = LV_REC_JSON CHANGING DATA = LS_TOKEN ). "关闭接口 CALL METHOD LO_HTTP_CLIENT->CLOSE. "获取Token CLEAR:LV_AUTHORIZATION. LV_AUTHORIZATION = LS_TOKEN-ACCESS_TOKEN. "如果有值，证明返回了正确的TOKEN，就可以继续 IF LS_TOKEN IS NOT INITIAL AND LV_CODE = '200'. CLEAR:LV_URL. LV_URL = 'https:// hostname/ssrc/v1/448/rgwd/price-library/list'. "创建http客户端 CALL METHOD CL_HTTP_CLIENT=>CREATE_BY_URL EXPORTING URL = LV_URL IMPORTING CLIENT = LO_HTTP_CLIENT EXCEPTIONS ARGUMENT_NOT_FOUND = 1 PLUGIN_NOT_ACTIVE = 2 INTERNAL_ERROR = 3 OTHERS = 4. LO_HTTP_CLIENT->PROPERTYTYPE_LOGON_POPUP = LO_HTTP_CLIENT->CO_DISABLED. "设定传输请求内容格式以及编码格式 LO_HTTP_CLIENT->REQUEST->SET_CONTENT_TYPE( CONTENT_TYPE = 'application/json; charset=utf-8' ). CALL METHOD LO_HTTP_CLIENT->REQUEST->SET_HEADER_FIELD EXPORTING NAME = 'Authorization' VALUE = LV_AUTHORIZATION. "设置http method 为POST LO_HTTP_CLIENT->REQUEST->SET_METHOD( IF_HTTP_REQUEST=>CO_REQUEST_METHOD_POST ). "IF_HTTP_ENTITY~CO_REQUEST_METHOD_GET CLEAR:LS_SENDDATA. LS_SENDDATA-PAYLOAD-DATEFROM = '20191231 00:00:00'. LS_SENDDATA-PAYLOAD-DATETO = '20191231 00:00:00'. LS_SENDDATA-PAYLOAD-PAGE = 0. LS_SENDDATA-PAYLOAD-SIZE = 50. "SAP不区分大小写，JAVA/C会区分， "一定让对方修改代码，不然只能SBB的拼接 CLEAR:LV_SEND_JSON. LV_SEND_JSON = /UI2/CL_JSON=>SERIALIZE( LS_SENDDATA ). "设置待传输内容长度 CLEAR:LV_LEN. LV_LEN = STRLEN( LV_SEND_JSON ). CALL METHOD LO_HTTP_CLIENT->REQUEST->SET_CDATA EXPORTING DATA = LV_SEND_JSON OFFSET = 0 LENGTH = LV_LEN. "发送 CALL METHOD LO_HTTP_CLIENT->SEND EXCEPTIONS HTTP_COMMUNICATION_FAILURE = 1 HTTP_INVALID_STATE = 2 HTTP_PROCESSING_FAILED = 3 HTTP_INVALID_TIMEOUT = 4 OTHERS = 5. "接收 CALL METHOD LO_HTTP_CLIENT->RECEIVE EXCEPTIONS HTTP_COMMUNICATION_FAILURE = 1 HTTP_INVALID_STATE = 2 HTTP_PROCESSING_FAILED = 3. CLEAR:LV_REC_JSON.",LS_JSON. LV_REC_JSON = LO_HTTP_CLIENT->RESPONSE->GET_CDATA( ). "解析JSON串 CLEAR:LS_RECDATA. /UI2/CL_JSON=>DESERIALIZE( EXPORTING JSON = LV_REC_JSON PRETTY_NAME = /UI2/CL_JSON=>PRETTY_MODE-CAMEL_CASE CHANGING DATA = LS_RECDATA ). "关闭接口 CALL METHOD LO_HTTP_CLIENT->CLOSE. IF LS_RECDATA IS NOT INITIAL. "将获取到的数据做其他的操作 ELSE. "报错 ENDIF. ELSEIF LV_CODE <> '200'. WRITE:LV_CODE. WRITE:/ LV_REASON. ENDIF.
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