flowable 擷取目前任務流程圖檔的輸入流

/**
     * 擷取目前任務流程圖檔的輸入流
     * @param PROC_INST_ID_ 流程執行個體ID
     * @from  fhadmin.cn
     */
    public InputStream genProcessDiagram(String PROC_INST_ID_, String type){
        /* 獲得活動的節點  */
        String processDefinitionId = "";
        if (this.isFinished(PROC_INST_ID_)) {   // 如果流程已經結束，則得到結束節點
            HistoricProcessInstance pi = historyService.createHistoricProcessInstanceQuery().processInstanceId(PROC_INST_ID_).singleResult();
            processDefinitionId=pi.getProcessDefinitionId();
        } else {                            // 如果流程沒有結束，則取目前活動節點
            /* 根據流程執行個體ID獲得目前處于活動狀态的ActivityId合集  */
            ProcessInstance pi = runtimeService.createProcessInstanceQuery().processInstanceId(PROC_INST_ID_).singleResult();
            processDefinitionId = pi.getProcessDefinitionId();
        }
        /* 獲得活動的節點對象  */
        List<HistoricActivityInstance> highLightedActivitList =  historyService.createHistoricActivityInstanceQuery().processInstanceId(PROC_INST_ID_).orderByHistoricActivityInstanceStartTime().asc().list();
        List<String> highLightedActivitis = new ArrayList<String>();                //節點對象ID
        for(HistoricActivityInstance tempActivity : highLightedActivitList){
            String activityId = tempActivity.getActivityId();
            highLightedActivitis.add(activityId);
        }
        BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinitionId);  //擷取流程圖
        ProcessEngineConfiguration engconf = processEngine.getProcessEngineConfiguration();
        /* 獲得活動的連線對象  */
        List<String> flows = new ArrayList<>();                                     //連線ID
        if("RU".equals(type)) {
            List<ActivityInstance> highLightedFlowInstances = runtimeService.createActivityInstanceQuery().activityType(BpmnXMLConstants.ELEMENT_SEQUENCE_FLOW).processInstanceId(PROC_INST_ID_).list();
            for(ActivityInstance ai : highLightedFlowInstances) {
                flows.add(ai.getActivityId());  
            }
        }else {
            List<HistoricActivityInstance> highLightedFlowInstances = historyService.createHistoricActivityInstanceQuery().activityType(BpmnXMLConstants.ELEMENT_SEQUENCE_FLOW).processInstanceId(PROC_INST_ID_).list();
            for(HistoricActivityInstance ha : highLightedFlowInstances) {
                flows.add(ha.getActivityId());  
            }
        }
        ProcessDiagramGenerator diagramGenerator = engconf.getProcessDiagramGenerator();
        InputStream in = diagramGenerator.generateDiagram(bpmnModel, "png", highLightedActivitis, flows, engconf.getActivityFontName(), engconf.getLabelFontName(), engconf.getAnnotationFontName(), engconf.getClassLoader(), 1.0, true);
        return in;
     }