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'EXPORTINGinput = lv_idIMPORTINGoutput = 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(<id>).ls_key-atta_id = <id>-atta_id.ls_key-atta_cat = <id>-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 blocke.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:\\temp\\" + 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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