如何将S/4HANA系统存储的图片文件用Java程序保存到本地

摘要：我在的事务码里为维护图片文件作为附件通过如下简单的代码即可将图片文件的二进制内容读取出来然后我把这段代码封装到一个里，在代码里消费这个，把返回的二进制内容存成本地图片文件。

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 = -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:	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();
        }
     }

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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