/**
 * @Author 葛明
 * @Note 讀取流程資源
 * @Date 2017-1-3 15:11
 * @param processDefinitionId 流程定義ID
 * @param resourceName        資源名稱
 */
@RequestMapping(value = "/read-resource")
public void readResource(String processDefinitionId, String resourceName,String pProcessInstanceId, HttpServletResponse response)
        throws 
 
Exception {
    // 設定頁面不快取
response.setHeader("Pragma", "No-cache");
    response.setHeader("Cache-Control", "no-cache");
    response.setDateHeader("Expires", 0);

    ProcessDefinitionQuery pdq = repositoryService.createProcessDefinitionQuery();
    ProcessDefinition pd = pdq.processDefinitionId(processDefinitionId).singleResult();

    if
 
(resourceName.endsWith(".png") && StringUtils.isEmpty(pProcessInstanceId) == false)
    {
        getActivitiProccessImage(pProcessInstanceId,response);}
    else
{
        // 通過介面讀取
InputStream resourceAsStream = repositoryService.getResourceAsStream(pd.getDeploymentId(), resourceName);

        // 輸出資源內容到相應物件
 
byte[] b = new byte[1024];
        int len = -1;
        while ((len = resourceAsStream.read(b, 0, 1024)) != -1) {
            response.getOutputStream().write(b, 0, len);
        }
    }
}


/**
 * 獲取流程影象，已執行節點和流程線高亮顯示
 */
public void getActivitiProccessImage(String pProcessInstanceId, HttpServletResponse response)
{try {
        //  獲取歷史流程例項
HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery()
                .processInstanceId(pProcessInstanceId).singleResult();

        if (historicProcessInstance != null) {
            // 獲取流程定義
ProcessDefinitionEntity processDefinition = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
                    .getDeployedProcessDefinition(historicProcessInstance.getProcessDefinitionId());

            // 獲取流程歷史中已執行節點，並按照節點在流程中執行先後順序排序
List<HistoricActivityInstance> historicActivityInstanceList = historyService.createHistoricActivityInstanceQuery()
                    .processInstanceId(pProcessInstanceId).orderByHistoricActivityInstanceId().asc().list();

            // 已執行的節點ID集合
List<String> executedActivityIdList = new ArrayList<String>();
            int index = 1;
            //獲取已經執行的節點ID
for (HistoricActivityInstance activityInstance : historicActivityInstanceList) {
                executedActivityIdList.add(activityInstance.getActivityId());                index++;
            }

            // 已執行的線集合
List<String> flowIds = new ArrayList<String>();
            // 獲取流程走過的線 
flowIds = getHighLightedFlows(processDefinition, historicActivityInstanceList);


            BpmnModel bpmnModel = repositoryService
.getBpmnModel(historicProcessInstance.getProcessDefinitionId());
            // 獲取流程圖影象字元流
ProcessDiagramGenerator pec = processEngine.getProcessEngineConfiguration().getProcessDiagramGenerator();
            //配置字型
InputStream imageStream = pec.generateDiagram(bpmnModel, "png", executedActivityIdList, flowIds,"宋體","微軟雅黑","黑體",null,2.0);

            response.setContentType("image/png");
            OutputStream os = response.getOutputStream();
            int bytesRead = 0;
            byte[] buffer = new byte[8192];
            while ((bytesRead = imageStream.read(buffer, 0, 8192)) != -1) {
                os.write(buffer, 0, bytesRead);
            }
            os.close();
            imageStream.close();
        }        } catch (Exception e) {        }
}

/**
 * 

*獲取流程走過的線 

*/public List<String> getHighLightedFlows( ProcessDefinitionEntity processDefinitionEntity, List<HistoricActivityInstance> historicActivityInstances) { List<String> highFlows = new ArrayList<String>();// 用以儲存高亮的線flowIdfor (int i = 0; i < historicActivityInstances.size() - 1; i++) {// 對歷史流程節點進行遍歷ActivityImpl activityImpl = processDefinitionEntity .findActivity(historicActivityInstances.get(i) .getActivityId());// 得到節點定義的詳細資訊List<ActivityImpl> sameStartTimeNodes = new ArrayList<ActivityImpl>();// 用以儲存後需開始時間相同的節點ActivityImpl sameActivityImpl1 = processDefinitionEntity .findActivity(historicActivityInstances.get(i + 1) .getActivityId());// 將後面第一個節點放在時間相同節點的集合裡sameStartTimeNodes.add(sameActivityImpl1); for (int j = i + 1; j < historicActivityInstances.size() - 1; j++) { HistoricActivityInstance activityImpl1 = historicActivityInstances .get(j);// 後續第一個節點HistoricActivityInstance activityImpl2 = historicActivityInstances .get(j + 1);// 後續第二個節點if (activityImpl1.getStartTime().equals( activityImpl2.getStartTime())) {// 如果第一個節點和第二個節點開始時間相同儲存ActivityImpl sameActivityImpl2 = processDefinitionEntity .findActivity(activityImpl2.getActivityId()); sameStartTimeNodes.add(sameActivityImpl2); } else {// 有不相同跳出迴圈break; } } List<PvmTransition> pvmTransitions = activityImpl .getOutgoingTransitions();// 取出節點的所有出去的線for (PvmTransition pvmTransition : pvmTransitions) {// 對所有的線進行遍歷ActivityImpl pvmActivityImpl = (ActivityImpl) pvmTransition .getDestination();// 如果取出的線的目標節點存在時間相同的節點裡，儲存該線的id，進行高亮顯示if (sameStartTimeNodes.contains(pvmActivityImpl)) { highFlows.add(pvmTransition.getId()); } } } return highFlows;}