Activiti7实现流程追踪

直接上代码吧。

/**
     * 根据流程实例Id,获取实时流程图片
     *
     * @param processInstanceId
     * @param outputStream
     * @return
     */
    public static void getFlowImgByInstanceId(String processInstanceId, OutputStream outputStream) {
        try {
            if (StringUtils.isEmpty(processInstanceId)) {
                logger.error("processInstanceId is null");
                return;
            }
            // 获取历史流程实例
            HistoricProcessInstance historicProcessInstance = activitiUtil.historyService
                    .createHistoricProcessInstanceQuery()
                    .processInstanceId(processInstanceId).singleResult();
            // 获取流程中已经执行的节点，按照执行先后顺序排序
            List<HistoricActivityInstance> historicActivityInstances = activitiUtil.historyService
                    .createHistoricActivityInstanceQuery()
                    .processInstanceId(processInstanceId)
                    .orderByHistoricActivityInstanceId()
                    .asc().list();
            // 高亮已经执行流程节点ID集合
            List<String> highLightedActivitiIds = new ArrayList<>();
            int index = 1;
            for (HistoricActivityInstance historicActivityInstance : historicActivityInstances) {
                
                // 用默认颜色
                highLightedActivitiIds.add(historicActivityInstance.getActivityId()); 

                index++;
            }

            ProcessDiagramGenerator processDiagramGenerator = null;

            // 使用默认的程序图片生成器
            processDiagramGenerator = new DefaultProcessDiagramGenerator();


            BpmnModel bpmnModel = activitiUtil.repositoryService
                    .getBpmnModel(historicProcessInstance.getProcessDefinitionId());
            // 高亮流程已发生流转的线id集合
            List<String> highLightedFlowIds = getHighLightedFlows(bpmnModel, historicActivityInstances);

            // 使用默认配置获得流程图表生成器，并生成追踪图片字符流
            InputStream imageStream = processDiagramGenerator.generateDiagram(bpmnModel,
                    highLightedActivitiIds, highLightedFlowIds, "宋体",
                    "微软雅黑", "黑体");

            // 输出图片内容
            Integer byteSize = 1024;
            byte[] b = new byte[byteSize];
            int len;
            while ((len = imageStream.read(b, 0, byteSize)) != -1) {
                outputStream.write(b, 0, len);
            }
        } catch (Exception e) {
            logger.error("processInstanceId" + processInstanceId + "生成流程图失败，原因：" + e.getMessage(), e);
        }

    }