Activity流程图跟踪

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/** * 获取当前的流程追踪图 * @param processInstanceId * @param response * @return */@RequestMapping("getWorkflowTrace")@ResponseBodypublic String getWorkflowTrace(String processInstanceId,HttpServletResponse response){InputStream in = workFlowFacade.getTaskTraceDiagram(processInstanceId); try {            OutputStream out = response.getOutputStream();            // 把图片的输入流程写入response的输出流中            byte[] b = new byte[1024];            for (int len = -1; (len= in.read(b))!=-1; ) {                out.write(b, 0, len);            }            // 关闭流            out.close();            in.close();        } catch (IOException e) {            e.printStackTrace();        }return null;}



public InputStream getTaskTraceDiagram(String processInstanceId) {//获取历史流程实例        HistoricProcessInstance processInstance =  historyService.createHistoricProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();       //获取流程图        BpmnModel bpmnModel = repositoryService.getBpmnModel(processInstance.getProcessDefinitionId());        processEngineConfiguration = processEngine.getProcessEngineConfiguration();        Context.setProcessEngineConfiguration((ProcessEngineConfigurationImpl) processEngineConfiguration);        ProcessDefinitionEntity definitionEntity = (ProcessDefinitionEntity)repositoryService.getProcessDefinition(processInstance.getProcessDefinitionId());        List<HistoricActivityInstance> highLightedActivitList =  historyService.createHistoricActivityInstanceQuery().processInstanceId(processInstanceId).list();        //高亮环节id集合        List<String> highLightedActivitis = new ArrayList<String>();        //高亮线路id集合        List<String> highLightedFlows = getHighLightedFlows(definitionEntity,highLightedActivitList);        for(HistoricActivityInstance tempActivity : highLightedActivitList){            String activityId = tempActivity.getActivityId();            highLightedActivitis.add(activityId);        }        InputStream inputStream = ProcessDiagramGenerator.generateDiagram(bpmnModel, "png", highLightedActivitis, highLightedFlows);return inputStream;}

/**     * 获取需要高亮的线     * @param processDefinitionEntity     * @param historicActivityInstances     * @return     */    private List<String> getHighLightedFlows(            ProcessDefinitionEntity processDefinitionEntity,            List<HistoricActivityInstance> historicActivityInstances) {        List<String> highFlows = new ArrayList<String>();// 用以保存高亮的线flowId        for (int i = 0; i < historicActivityInstances.size() - 1; i++) {// 对历史流程节点进行遍历            ActivityImpl activityImpl = processDefinitionEntity                    .findActivity(historicActivityInstances.get(i)                            .getActivityId());// 得到节点定义的详细信息            List<ActivityImpl> sameStartTimeNodes = new ArrayList<ActivityImpl>();// 用以保存后需开始时间相同的节点            ActivityImpl sameActivityImpl1 = processDefinitionEntity                    .findActivity(historicActivityInstances.get(i + 1)                            .getActivityId());            // 将后面第一个节点放在时间相同节点的集合里            sameStartTimeNodes.add(sameActivityImpl1);            for (int j = i + 1; j < historicActivityInstances.size() - 1; j++) {                HistoricActivityInstance activityImpl1 = historicActivityInstances                        .get(j);// 后续第一个节点                HistoricActivityInstance activityImpl2 = historicActivityInstances                        .get(j + 1);// 后续第二个节点                if (activityImpl1.getStartTime().equals(                        activityImpl2.getStartTime())) {                    // 如果第一个节点和第二个节点开始时间相同保存                    ActivityImpl sameActivityImpl2 = processDefinitionEntity                            .findActivity(activityImpl2.getActivityId());                    sameStartTimeNodes.add(sameActivityImpl2);                } else {                    // 有不相同跳出循环                    break;                }            }            List<PvmTransition> pvmTransitions = activityImpl                    .getOutgoingTransitions();// 取出节点的所有出去的线            for (PvmTransition pvmTransition : pvmTransitions) {                // 对所有的线进行遍历                ActivityImpl pvmActivityImpl = (ActivityImpl) pvmTransition                        .getDestination();                // 如果取出的线的目标节点存在时间相同的节点里，保存该线的id，进行高亮显示                if (sameStartTimeNodes.contains(pvmActivityImpl)) {                    highFlows.add(pvmTransition.getId());                }            }        }        return highFlows;    }
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