/**
     * 查詢當前流程圖 www.fhadmin.org
     * @param taskId
     * @param response
     * @return
     * @throws Exception
     */
    @RequestMapping("/showCurrentView")
    public ModelAndView showCurrentView(String taskId,HttpServletResponse response)throws Exception{
        ModelAndView mav=new ModelAndView();
        Task task=taskService.createTaskQuery() // 建立任務查詢
                .taskId(taskId) // 根據任務id查詢
                .singleResult(); 
        String processDefinitionId=task.getProcessDefinitionId(); // 獲取流程定義id
        ProcessDefinition processDefinition=repositoryService.createProcessDefinitionQuery() // 建立流程定義查詢
                .processDefinitionId(processDefinitionId) // 根據流程定義id查詢
                .singleResult(); 
        mav.addObject("deploymentId",processDefinition.getDeploymentId()); // 部署id
        mav.addObject("diagramResourceName", processDefinition.getDiagramResourceName()); // 圖片資原始檔名稱

        ProcessDefinitionEntity processDefinitionEntity=(ProcessDefinitionEntity) repositoryService.getProcessDefinition(processDefinitionId); 
        String processInstanceId=task.getProcessInstanceId(); // 獲取流程例項id
        ProcessInstance pi=runtimeService.createProcessInstanceQuery() // 根據流程例項id獲取流程例項
                .processInstanceId(processInstanceId)
                .singleResult();
        ActivityImpl activityImpl=processDefinitionEntity.findActivity(pi.getActivityId()); // 根據活動id獲取活動例項
        mav.addObject("x", activityImpl.getX()); // x座標
        mav.addObject("y", activityImpl.getY()); // y座標
        mav.addObject("width", activityImpl.getWidth()); // 寬度
        mav.addObject("height", activityImpl.getHeight()); // 高度
        mav.setViewName("page/currentView");
        return mav;
    }