JSON到ABAP:需要什么样的数据结构?

时间:2017-02-14 19:24:52

标签: sap abap

我想将json字符串解析为abap内部表。

示例json字符串看起来像这样

  

{" apiVersion":" 1.0","数据":{"位置":"德累斯顿" ,"温度":" 7"," skytext":"小雨","湿度":&#34 ; 96"," wind":" 7.31 km / h"," date":" 02-14-2017",& #34;天":"星期二" }}

我想使用方法

cl_fdt_json=>json_to_data

并将值和键放入这样的表中

      types: begin of map,
             key type string,
             value type string,
             end of map.
    data json_data type standard table of map.

但不幸的是,它并不像这样。有没有人有这种问题的经验?因为我无法访问所有文档,因为这是我在SAP招聘的样本任务,这是"难题的最后一部分。 ;),我很难找到解决方案。

谢谢!!!

编辑:因此对于vwegerts回答我尝试了以下(这与我原本想做的有点不同,但也没关系)

  DATA cl_oops TYPE REF TO cx_dynamic_check.
  DATA(text) = result.
  TYPES: BEGIN OF ty_structure,
           skytext TYPE string,
           location type string,
           temperature type string,
           humidity type string,
           wind type string,
           date type string,
           day type string,
         END OF ty_structure.
  DATA : wa_structure TYPE ty_structure.
  TRY.
      CALL TRANSFORMATION id
           SOURCE XML text
           RESULT data = wa_structure.
      message  wa_structure-skytext type 'I'.
    CATCH cx_transformation_error INTO cl_oops.
      WRITE cl_oops->get_longtext( ).
  ENDTRY.

但它仍然无效。当我检查wa_structure-skytext的值时,它是不幸的空。我找不到错误。有没有人有想法?

4 个答案:

答案 0 :(得分:1)

您可能希望查看w ell-documented capabilities of the ABAP runtime system itself,而不是使用FDT类(可能并非在所有系统上都可用)。 This example program可能是您的最佳选择。您基本上提供了一个简单转换,它将JSON XML结构映射到您的数据结构,实例化一个sXML JSON读取器,然后将其作为源传递给target="_self"

答案 1 :(得分:1)

除了@vwegert建议使用SAP记录的json转换外,您还可以查看open source alternativesThis one看起来很有希望。

答案 2 :(得分:0)

  

{" apiVersion":" 1.0","数据":{"位置":"德累斯顿" ,"温度":" 7"," skytext":"小雨","湿度":&#34 ; 96"," wind":" 7.31 km / h"," date":" 02-14-2017",& #34;天":"星期二" }}

ABAP中的相应结构将是:

"The nested data table 
Types: Begin of ty_data,
        location TYPE string,
        temperature TYPE string,
        skytext TYPE string,
        etc.
      End of ty_data,
      ty_t_data TYPE STANDARD TABLE OF ty_data WITH NON-UNIQUE DEFAULT KEY INITIAL SIZE 0.
"the whole json structure
Types: Begin of ty_json,
        apiversion TYPE string,
        data TYPE ty_t_data,
       End of ty_json.
DATA: ls_data TYPE ty_json.

现在你必须找到一个适当的JSON反序列化器,它可以处理嵌套表。 大多数反序列化器都需要输入表格,因此您必须添加' [' ...']'在JSON字符串的末尾,并定义lt_data TYPE STANDARD TABLE OF ty_json。

答案 3 :(得分:0)

您可以通过SAP JSON-XML阅读器来做到这一点:

CLASS lcl_json DEFINITION.
  PUBLIC SECTION.
    TYPES: BEGIN OF map,
             key   TYPE string,
             value TYPE string,
           END OF map,
           tt_map TYPE STANDARD TABLE OF map WITH DEFAULT KEY.

    CLASS-METHODS: parse IMPORTING iv_json       TYPE string
                         RETURNING VALUE(rv_map) TYPE tt_map.
ENDCLASS.

CLASS lcl_json IMPLEMENTATION.
  METHOD parse.
    DATA(o_reader) = cl_sxml_string_reader=>create( cl_abap_codepage=>convert_to( iv_json ) ).
    TRY.
        DATA(o_node) = o_reader->read_next_node( ).
        WHILE o_node IS BOUND.
          CASE o_node->type.
            WHEN if_sxml_node=>co_nt_element_open.
              DATA(op) = CAST if_sxml_open_element( o_node ).
              LOOP AT op->get_attributes( ) ASSIGNING FIELD-SYMBOL(<a>).
                APPEND VALUE #( key = <a>->get_value( ) ) TO rv_map ASSIGNING FIELD-SYMBOL(<json>).
              ENDLOOP.
            WHEN if_sxml_node=>co_nt_value.
              DATA(val) = CAST if_sxml_value_node( o_node ).
              <json>-value = val->get_value( ).
            WHEN OTHERS.
          ENDCASE.
          o_node = o_reader->read_next_node( ).
        ENDWHILE.

      CATCH cx_root INTO DATA(e_txt).
        RAISE EXCEPTION TYPE cx_sxml_parse_error EXPORTING error_text = e_txt->get_text( ).
    ENDTRY.
  ENDMETHOD.
ENDCLASS.

START-OF-SELECTION.

  DATA(json_string) = ` {"apiVersion":"1.0", ` &&
  ` "data":{ "location":"Dresden", "temperature":"7",` &&
  ` "skytext":"Light rain", "humidity":"96", "wind":"7.31 km/h", "date":"02-14-2017", "day":"Tuesday" } } `.
  TRY.
      DATA(it_map) = lcl_json=>parse( json_string ).
    CATCH cx_root INTO DATA(e_txt).
      " do handling
  ENDTRY.