閑鹿工作流 activiti6.0 顯示已結束的流程圖

代碼參考 閑鹿群友@  

自定義的ProcessController類裡，判斷流程是否已執行結束，執行結束 則查詢曆史流程

@RequestMapping(value = "/read-resource")
    public void readResource(String pProcessInstanceId, HttpServletResponse response)
            throws Exception {
        // 設定頁面不緩存
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);

        ProcessDefinitionQuery pdq = repositoryService.createProcessDefinitionQuery();

        //運作中的流程
        ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(pProcessInstanceId).singleResult();
        ProcessDefinition pd;
        if(processInstance == null){
            //曆史流程/已結束的流程    比較複雜的流程圖不建議顯示執行流程，高亮線條流程等 看起來會比較亂
            HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery().processInstanceId(pProcessInstanceId).singleResult();
            //已結束流程查詢
            pd = pdq.processDefinitionId(historicProcessInstance.getProcessDefinitionId()).singleResult();
        }else{
            //正在執行的流程查詢
            pd = pdq.processDefinitionId(processInstance.getProcessDefinitionId()).singleResult();
        }

        String resourceName = pd.getDiagramResourceName();

        if(resourceName.endsWith(".png") && StringUtils.isEmpty(pProcessInstanceId) == false)
        {
            getActivitiProccessImage(pProcessInstanceId,response);
            //ProcessDiagramGenerator.generateDiagram(pde, "png", getRuntimeService().getActiveActivityIds(processInstanceId));
        }
        else
        {
            // 通過接口讀取
            InputStream resourceAsStream = repositoryService.getResourceAsStream(pd.getDeploymentId(), resourceName);

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