如何将S/4HANA系统存储的图片文件用Java程序保存到本地

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(<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.

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();
    }
    }

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();
    }
     }