摘要：我在的事務碼里為維護圖片文件作為附件通過如下簡單的代碼即可將圖片文件的二進制內容讀取出來然后我把這段代碼封裝到一個里，在代碼里消費這個，把返回的二進制內容存成本地圖片文件。

我在S/4HANA的事務碼MM02里為Material維護圖片文件作為附件：

通過如下簡單的ABAP代碼即可將圖片文件的二進制內容讀取出來：

REPORT zgos_api.

DATA ls_appl_object     TYPE gos_s_obj.
DATA lo_gos_api         TYPE REF TO cl_gos_api.
DATA lt_attachment_list TYPE gos_t_atta.
DATA lt_role_filter     TYPE gos_t_rol.

DATA: lv_id  TYPE matnr VALUE "16",
      lt_att TYPE TABLE OF sibflporb.

CALL FUNCTION "CONVERSION_EXIT_MATN1_INPUT"
  EXPORTING
    input  = lv_id
  IMPORTING
    output = lv_id.
ls_appl_object-typeid = "BUS1001006".
ls_appl_object-instid = lv_id.
ls_appl_object-catid  = "BO".

START-OF-SELECTION.

  TRY.
      lo_gos_api = cl_gos_api=>create_instance( ls_appl_object ).
      APPEND cl_gos_api=>c_attachment TO lt_role_filter.
      lt_attachment_list = lo_gos_api->get_atta_list( lt_role_filter ).
    CATCH cx_gos_api INTO DATA(error).
      WRITE:/ error->get_text( ).
      RETURN.
  ENDTRY.

  DATA: ls_key TYPE gos_s_attkey,
        lv_base64 type string.

  LOOP AT lt_attachment_list ASSIGNING FIELD-SYMBOL().
    ls_key-atta_id = -atta_id.
    ls_key-atta_cat = -atta_cat.
    DATA(ls) = lo_gos_api->get_al_item( ls_key ).
    BREAK-POINT.
  ENDLOOP.

然后我把這段代碼封裝到一個Function moduleZDIS_GET_MATERIAL_IMAGES里，在Java代碼里消費這個function module，把S/4HANA返回的二進制內容存成本地圖片文件。在ABAP系統里圖片二進制文件內容的類型為RAWSTRING，如何在Java里使用它？

使用JCO在Java里消費ABAP function module的代碼：

static private void getProductImageTest(){
        JCoDestination destination = null;
        try {
            destination = JCoDestinationManager.getDestination(DESTINATION_NAME);
            JCoRepository repo = destination.getRepository();
            JCoFunction stfcConnection = repo.getFunction("ZDIS_GET_MATERIAL_IMAGES");

            JCoParameterList imports = stfcConnection.getImportParameterList();
        
            String materialID = "16";

            imports.setValue("IV_MATERIAL_ID", materialID);

            stfcConnection.execute(destination);
        
            JCoParameterList exports = stfcConnection.getExportParameterList();
            
            int abapDuration = exports.getInt("EV_DURATION");
            
            StringBuilder sb = new StringBuilder();
            sb.append("{ "" + ABAP_DURATION + "": " + abapDuration + ",");
            
            sb.append(""" + UPSELL_PRODUCT + "":[");
            
            JCoTable codes = exports.getTable("ET_IMAGES");
            
            int row = codes.getNumRows();
            System.out.println("Total rows: " + row);
            
            System.out.println("ABAP duration: " + abapDuration);
            
            for( int i = 0; i < row; i++){
                codes.setRow(i);
                sb.append("{"" + FILE_ID + "":" + codes.getString("FILEID") + ","
                        + """ + FILE_OWNER + "":"" + codes.getString("OWNER") + """ + ",");
                sb.append("{"" + FILE_CDATE + "":" + codes.getString("CREATION_DATE") + ","
                        + """ + FILE_NAME + "":"" + codes.getString("FILENAME") + """); 
                
                storeLocalFile(codes);
                if( i < row - 1){
                    sb.append("},");
                }
                else{
                    sb.append("}");
                }
            }
            sb.append("]}");
            
            System.out.println("Final json: " + sb.toString());
            
        } catch (JCoException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

其中把ABAP的類型為RAWSTRING的字段保存成本地文件的代碼封裝于方法storeLocalFile里：

static private void storeLocalFile(JCoTable codes){
        InputStream is = codes.getBinaryStream("FILECONTENT");
        try {
            File file = new File("c:	emp" + codes.getString("FILENAME"));

            byte[] bytes = new byte[is.available()];
            is.read(bytes);
            
            OutputStream output = new FileOutputStream(file);

        BufferedOutputStream bufferedOutput = new BufferedOutputStream(output);

        bufferedOutput.write(bytes);
            
        bufferedOutput.close();
        is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
     }

執行Java代碼后，在本地C盤temp目錄下能夠看到S/4HANA里Material ID為16的兩個附件圖片：

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