如何將S/4HANA系統存儲的圖片文件用Java程序保存到本地

我在S/4HANA的事務碼MM02裏爲Material維護圖片文件做爲附件：

經過以下簡單的ABAP代碼便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(<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.

而後我把這段代碼封裝到一個Function moduleZDIS_GET_MATERIAL_IMAGES裏，在Java代碼裏消費這個function module，把S/4HANA返回的二進制內容存成本地圖片文件。在ABAP系統裏圖片二進制文件內容的類型爲RAWSTRING，如何在Java裏使用它？

使用JCO在Java裏消費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的類型爲RAWSTRING的字段保存成本地文件的代碼封裝於方法storeLocalFile裏：

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代碼後，在本地C盤temp目錄下可以看到S/4HANA裏Material ID爲16的兩個附件圖片：

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