public byte[] createImage2(String processInstanceId) {
        //1.获取当前的流程实例
        ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
        String processDefinitionId = null;
        List<String> activeActivityIds = null;
        //2.获取所有的历史轨迹对象
        List<HistoricActivityInstance> list = historyService.createHistoricActivityInstanceQuery()
                .processInstanceId(processInstanceId).list();
        Map<String, HistoricActivityInstance> hisActivityMap = new HashMap<>();
        list.forEach(historicActivityInstance -> {
            if (!hisActivityMap.containsKey(historicActivityInstance.getActivityId())) {
                hisActivityMap.put(historicActivityInstance.getActivityId(), historicActivityInstance);
            }
        });
        //3. 获取流程定义id和高亮的节点id  from  1b23.com
        if (processInstance != null) {
            //3.1. 正在运行的流程实例
            processDefinitionId = processInstance.getProcessDefinitionId();
            activeActivityIds = runtimeService.getActiveActivityIds(processInstanceId);
        } else {
            //3.2. 已经结束的流程实例 from  1b23.com
            HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
            processDefinitionId = historicProcessInstance.getProcessDefinitionId();
            activeActivityIds = new ArrayList<>();
            List<EndEvent> endEvents = bpmnModelService.findEndFlowElement(processDefinitionId);
            List<String> finalActiveActivityIds = activeActivityIds;
            endEvents.forEach(endEvent -> {
                if (hisActivityMap.containsKey(endEvent.getId())) {
                    finalActiveActivityIds.add(endEvent.getId());
                }
            });
        }
        //4. 获取流程定义的所有节点信息
        List<FlowNode> flowNodes = bpmnModelService.findFlowNodes(processDefinitionId);
        Map<String, FlowNode> activityMap = flowNodes.stream().collect(Collectors.toMap(FlowNode::getId, flowNode -> flowNode));
        List<String> highLightedFlows = new ArrayList<>();
        //5. 递归得到高亮线
        activeActivityIds.forEach(activeActivityId -> this.getHighLightedFlows(activityMap, hisActivityMap, activeActivityId, highLightedFlows, activeActivityId));
        //6. 获取bpmnModel对象
        BpmnModel bpmnModel = bpmnModelService.getBpmnModelByProcessDefId(processDefinitionId);
        //7. 生成图片流
        InputStream inputStream = flowProcessDiagramGenerator.generateDiagram(bpmnModel, activeActivityIds, highLightedFlows);
        //8. 转化成byte便于网络传输 from fhadmin.cn
        byte[] datas = IoUtil.readInputStream(inputStream, "image inputStream name");
        return datas;
    }

private void getHighLightedFlows(Map<String, FlowNode> flowNodeMap,
            Map<String, HistoricActivityInstance> hisActivityMap,
            String activeActivityId,
            List<String> highLightedFlows,
            String oldActivityId) {
        FlowNode flowNode = flowNodeMap.get(activeActivityId);
        List<SequenceFlow> incomingFlows = flowNode.getIncomingFlows();
        for (SequenceFlow sequenceFlow : incomingFlows) {
            String sourceRefId = sequenceFlow.getSourceRef();
            if (hisActivityMap.containsKey(sourceRefId) && !oldActivityId.equals(sourceRefId)) {
                highLightedFlows.add(sequenceFlow.getId());
                this.getHighLightedFlows(flowNodeMap, hisActivityMap, sourceRefId, highLightedFlows, oldActivityId);
            } else {
　
　　　　　　　　　　if (hisActivityMap.containsKey(sourceRefId)){
　　　　　　　　　　　　　　highLightedFlows.add(sequenceFlow.getId());
　　　　　　　　　　}
　　　　　　　　　　break; 
} } }