如何将S/4HANA系统存储的图片文件用Java程序保存到本地

我在S/4HANA的事务码MM02里为Material维护图片文件作为附件：

通过如下简单的ABAP代码即可将图片文件的二进制内容读取出来：

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 = <id>-atta_id. ls_key-atta_cat = <id>-atta_cat. DATA(ls) = lo_gos_api->get_al_item( ls_key ). BREAK-POINT. ENDLOOP. 

然后我把这段代码封装到一个Function moduleZDIS_GET_MATERIAL_IMAGES里，在Java代码里消费这个function module，把S/4HANA返回的二进制内容存成本地图片文件。在ABAP系统里图片二进制文件内容的类型为RAWSTRING，如何在Java里使用它？

使用JCO在Java里消费ABAP function module的代码：

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的类型为RAWSTRING的字段保存成本地文件的代码封装于方法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();
        }
     } 

执行Java代码后，在本地C盘temp目录下能够看到S/4HANA里Material ID为16的两个附件图片：

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