/** * 显示图片 * * @return */ @RequestMapping(value = "/viewPic.do") public void viewPic( HttpServletRequest request, HttpServletResponse response, @RequestParam("executionId") String executionId) throws Exception { ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(executionId).singleResult(); BpmnModel bpmnModel = repositoryService.getBpmnModel(processInstance.getProcessDefinitionId()); List<String> activeActivityIds = runtimeService.getActiveActivityIds(executionId); // 使用spring注入引擎请使用下面的这行代码 Context.setProcessEngineConfiguration(processEngine.getProcessEngineConfiguration()); InputStream imageStream = ProcessDiagramGenerator.generateDiagram(bpmnModel, "png", activeActivityIds); // 输出资源内容到相应对象 byte[] b = new byte[1024]; int len; while ((len = imageStream.read(b, 0, 1024)) != -1) { response.getOutputStream().write(b, 0, len); } }