activiti7。1。0。M6（七）获取流程审批图片，高亮显示

　　/**      * 根据流程实例Id,获取实时流程图片      *      * @param processInstanceId      * @param      * @param useCustomColor    true:用自定义的颜色（完成节点绿色，当前节点红色），default:用默认的颜色（红色）      * @return      */     public  void getFlowImgByInstanceId(String processInstanceId, HttpServletResponse response, boolean useCustomColor) {         try {             if (org.springframework.util.StringUtils.isEmpty(processInstanceId)) {                 log.error(＂processInstanceId is null＂);                 return;             }             // 获取历史流程实例             HistoricProcessInstance historicProcessInstance = 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 historicActivityInstances = historyService                     .createHistoricActivityInstanceQuery()                     .processInstanceId(processInstanceId)                     .orderByHistoricActivityInstanceId()                     .desc().list();             // 高亮已经执行流程节点ID集合             List highLightedActivitiIds = new ArrayList<>();             int index = 1;             for (HistoricActivityInstance historicActivityInstance : historicActivityInstances) {                 if (useCustomColor) {                     // 用自定义颜色                     if (index == historicActivityInstances.size()) {                         // 当前节点                         highLightedActivitiIds.add(historicActivityInstance.getActivityId() + ＂#＂);                     } else {                         // 已完成节点                         highLightedActivitiIds.add(historicActivityInstance.getActivityId());                     }                 } else {                     // 用默认颜色                     highLightedActivitiIds.add(historicActivityInstance.getActivityId());                 }                  index++;             }              ProcessDiagramGenerator processDiagramGenerator = null;             if (useCustomColor) {                 // 使用自定义的程序图片生成器                 processDiagramGenerator = new CustomProcessDiagramGenerator();              } else {                 // 使用默认的程序图片生成器                 processDiagramGenerator = new DefaultProcessDiagramGenerator();             }               BpmnModel bpmnModel = repositoryService                     .getBpmnModel(historicProcessInstance.getProcessDefinitionId());             // 高亮流程已发生流转的线id集合             List 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＂,                     ＂宋体＂, ＂宋体＂);              // 输出图片内容             Integer byteSize = 1024;             byte[] b = new byte[byteSize];             int len;             while ((len = imageStream.read(b, 0, byteSize)) != -1) {                 response.getOutputStream().write(b, 0, len);             }         } catch (Exception e) {             log.error(＂processInstanceId＂ + processInstanceId + ＂生成流程图失败，原因：＂ + e.getMessage(), e);         }      }/**      * 获取已经流转的线      *      * @param bpmnModel      * @param historicActivityInstances      * @return      */     private static List getHighLightedFlows(BpmnModel bpmnModel,                                                     List historicActivityInstances) {          // 流转线ID集合         List flowIdList = new ArrayList();         // 全部活动实例         List historicFlowNodeList = new LinkedList();         // 已完成的历史活动节点         List finishedActivityInstanceList = new LinkedList();         for (HistoricActivityInstance historicActivityInstance : historicActivityInstances) {             historicFlowNodeList.add((FlowNode) bpmnModel.getMainProcess().getFlowElement(historicActivityInstance.getActivityId(), true));             if (historicActivityInstance.getEndTime() != null) {                 finishedActivityInstanceList.add(historicActivityInstance);             }         }          // 遍历已完成的活动实例，从每个实例的outgoingFlows中找到已执行的         FlowNode currentFlowNode = null;         for (HistoricActivityInstance currentActivityInstance : finishedActivityInstanceList) {             // 获得当前活动对应的节点信息及outgoingFlows信息             currentFlowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(currentActivityInstance.getActivityId(), true);             List sequenceFlowList = currentFlowNode.getOutgoingFlows();              /**              * 遍历outgoingFlows并找到已已流转的              * 满足如下条件认为已已流转：              * 1.当前节点是并行网关或包含网关，则通过outgoingFlows能够在历史活动中找到的全部节点均为已流转              * 2.当前节点是以上两种类型之外的，通过outgoingFlows查找到的时间最近的流转节点视为有效流转              */             FlowNode targetFlowNode = null;             if (＂parallelGateway＂.equals(currentActivityInstance.getActivityType())                     || ＂inclusiveGateway＂.equals(currentActivityInstance.getActivityType())) {                 // 遍历历史活动节点，找到匹配Flow目标节点的                 for (SequenceFlow sequenceFlow : sequenceFlowList) {                     targetFlowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(sequenceFlow.getTargetRef(), true);                     if (historicFlowNodeList.contains(targetFlowNode)                             && (sequenceFlowList.size() > 1 || Objects.nonNull(currentActivityInstance.getEndTime()))) {                         flowIdList.add(sequenceFlow.getId());                     }                 }             } else {                 // 遍历历史活动节点，找到匹配Flow目标节点的                 for (SequenceFlow sequenceFlow : sequenceFlowList) {                     for (HistoricActivityInstance historicActivityInstance : historicActivityInstances) {                         if (historicActivityInstance.getActivityId().equals(sequenceFlow.getTargetRef())) {                             if(Objects.nonNull(currentActivityInstance.getEndTime())                                     && Objects.nonNull(historicActivityInstance.getStartTime())){                                  String  endTime = DateUtil.format(currentActivityInstance.getEndTime(), ＂yyyy-MM-dd HH:mm:ss＂);                                 String  startTime = DateUtil.format(historicActivityInstance.getStartTime(), ＂yyyy-MM-dd HH:mm:ss＂);                                   if(startTime.equals(endTime)){                                     flowIdList.add(sequenceFlow.getId());                                 }                             }                         }                     }                 }             }         }         return flowIdList;     }
　　显示效果如下：