Activiti6自学之路（八）——查看流程图

清疚 2022-10-01 15:59 704阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70]

前面章节我们已经设计了流程图和执行了流程图任务。比如张三填写了请假申请后，如果想要知道现在流程已经到哪里了，处理进度怎么样，哪怎么实现了。Activiti提供了查看流程图功能，可以看到指定流程进度

//查看流程图
      	 @RequestMapping(value = "/image", method = RequestMethod.GET)
         public void image(HttpServletResponse response,
          @RequestParam String processInstanceId) {
             try {
                 InputStream is = getDiagram(processInstanceId);
                 if (is == null)
                     return;
    
                 response.setContentType("image/png");
    
                 BufferedImage image = ImageIO.read(is);
                 OutputStream out = response.getOutputStream();
                 ImageIO.write(image, "png", out);
    
                 is.close();
                 out.close();
             } catch (Exception ex) {
                 log.error("查看流程图失败", ex);
             }
         }
      	 
        
     	public InputStream getDiagram(String processInstanceId) {
     	    //获得流程实例
     	    ProcessInstance processInstance = runtimeService.createProcessInstanceQuery()
     	            .processInstanceId(processInstanceId).singleResult();
     	    String processDefinitionId = StringUtils.EMPTY;
     	    if (processInstance == null) {
     	        //查询已经结束的流程实例
     	        HistoricProcessInstance processInstanceHistory =
     	                historyService.createHistoricProcessInstanceQuery()
     	                        .processInstanceId(processInstanceId).singleResult();
     	        if (processInstanceHistory == null)
     	            return null;
     	        else
     	            processDefinitionId = processInstanceHistory.getProcessDefinitionId();
     	    } else {
     	        processDefinitionId = processInstance.getProcessDefinitionId();
     	    }
    
     	    //使用宋体
     	    String fontName = "宋体";
     	    //获取BPMN模型对象
     	    BpmnModel model = repositoryService.getBpmnModel(processDefinitionId);
     	    //获取流程实例当前的节点，需要高亮显示
     	    List<String> currentActs = Collections.EMPTY_LIST;
     	    if (processInstance != null)
     	        currentActs = runtimeService.getActiveActivityIds(processInstance.getId());
    
     	    return processEngine.getProcessEngineConfiguration()
     	            .getProcessDiagramGenerator()
     	            .generateDiagram(model, "png", currentActs, new ArrayList<String>(),
     	                    fontName, fontName, fontName, null, 1.0);
     	}

流程实例：13  
![在这里插入图片描述][20190616132636893.png]

[http://127.0.0.1:8080/spring-activiti/leave/image?processInstanceId=13][http_127.0.0.1_8080_spring-activiti_leave_image_processInstanceId_13]

即可看到流程实例进度图

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70]: /images/20220113/3c837b1ac2674c4993a43f803dc5d488.png
[20190616132636893.png]: /images/20220113/9d843ffbaa0c449fa2430ba48dba58ae.png
[http_127.0.0.1_8080_spring-activiti_leave_image_processInstanceId_13]: http://127.0.0.1:8080/spring-activiti/leave/image?processInstanceId=13