Activiti学习——生成历史流程跟踪图

你的名字 2022-07-21 02:17 312阅读 0赞

# 需求说明 #

1.  流程在流转或者结束后，可以查看其流转历史流程图
2.  效果图  
    ![AIBijUM.png][]

# 实现思路 #

1.  获取流程图
2.  获取指定流程的流转环节
3.  获取每个流转环节之间的线
4.  根据流程图，环节，线绘制流转历史流程图

# 实现代码 #

@Controller
    @RequestMapping(value = "/first")
    public class FirstController { 
    
    
        @Autowired
        RepositoryService repositoryService;
        @Autowired
        ManagementService managementService;
        @Autowired
        protected RuntimeService runtimeService;
        @Autowired
        ProcessEngineConfiguration processEngineConfiguration;
        @Autowired
        ProcessEngineFactoryBean processEngine;
        @Autowired
        HistoryService historyService;
        @Autowired
        TaskService taskService;
    
        /** * 读取带跟踪的图片 */
        @RequestMapping(value = "/test")
        public void test(HttpServletResponse response) throws Exception {
            // 部署流程，只要是符合BPMN2规范的XML文件，理论上都可以被ACTIVITI部署
            repositoryService.createDeployment().addClasspathResource("com/pzr/demo/diagrams/MyProcess.bpmn").deploy();
            // 开启流程，myprocess是流程的ID
            System.out.println("流程【启动】，环节推动到【一次审批】环节");
            runtimeService.startProcessInstanceByKey("myProcess");
            // 查询历史表中的Task
            List<Task> task = taskService.createTaskQuery().list();
            Task task1 = task.get(task.size()-1);
            //解开注释就推动到下一环节，对应的在流程图上看到
            taskService.complete(task1.getId());
            System.out.println("执行【一次审批】环节，流程推动到【二次审批】环节");
            task1 = taskService.createTaskQuery().executionId(task1.getExecutionId()).singleResult();
    
            //解开注释就推动到下一环节，对应的在流程图上看到
            taskService.complete(task1.getId());
            System.out.println("执行【二次审批】环节，流程推动到【结束】环节");
    
            //processInstanceId
            String processInstanceId = task1.getProcessInstanceId();
            //获取历史流程实例
            HistoricProcessInstance processInstance =  historyService.createHistoricProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
            //获取流程图
            BpmnModel bpmnModel = repositoryService.getBpmnModel(processInstance.getProcessDefinitionId());
            processEngineConfiguration = processEngine.getProcessEngineConfiguration();
            Context.setProcessEngineConfiguration((ProcessEngineConfigurationImpl) processEngineConfiguration);
    
            ProcessDiagramGenerator diagramGenerator = processEngineConfiguration.getProcessDiagramGenerator();
            ProcessDefinitionEntity definitionEntity = (ProcessDefinitionEntity)repositoryService.getProcessDefinition(processInstance.getProcessDefinitionId());
    
            List<HistoricActivityInstance> highLightedActivitList =  historyService.createHistoricActivityInstanceQuery().processInstanceId(processInstanceId).list();
            //高亮环节id集合
            List<String> highLightedActivitis = new ArrayList<String>();
            //高亮线路id集合
            List<String> highLightedFlows = getHighLightedFlows(definitionEntity,highLightedActivitList);
    
            for(HistoricActivityInstance tempActivity : highLightedActivitList){
                String activityId = tempActivity.getActivityId();
                highLightedActivitis.add(activityId);
            }
    
            //中文显示的是口口口，设置字体就好了
            InputStream imageStream = diagramGenerator.generateDiagram(bpmnModel, "png", highLightedActivitis,highLightedFlows,"宋体","宋体",null,1.0);
            //单独返回流程图，不高亮显示
    // InputStream imageStream = diagramGenerator.generatePngDiagram(bpmnModel);
            // 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);
            }
        }
    
        /** * 获取需要高亮的线 * @param processDefinitionEntity * @param historicActivityInstances * @return */
        private List<String> getHighLightedFlows(
                ProcessDefinitionEntity processDefinitionEntity,
                List<HistoricActivityInstance> historicActivityInstances) {
            List<String> highFlows = new ArrayList<String>();// 用以保存高亮的线flowId
            for (int i = 0; i < historicActivityInstances.size() - 1; i++) {
       // 对历史流程节点进行遍历
                ActivityImpl activityImpl = processDefinitionEntity
                        .findActivity(historicActivityInstances.get(i)
                                .getActivityId());// 得到节点定义的详细信息
                List<ActivityImpl> sameStartTimeNodes = new ArrayList<ActivityImpl>();// 用以保存后需开始时间相同的节点
                ActivityImpl sameActivityImpl1 = processDefinitionEntity
                        .findActivity(historicActivityInstances.get(i + 1)
                                .getActivityId());
                // 将后面第一个节点放在时间相同节点的集合里
                sameStartTimeNodes.add(sameActivityImpl1);
                for (int j = i + 1; j < historicActivityInstances.size() - 1; j++) {
                    HistoricActivityInstance activityImpl1 = historicActivityInstances
                            .get(j);// 后续第一个节点
                    HistoricActivityInstance activityImpl2 = historicActivityInstances
                            .get(j + 1);// 后续第二个节点
                    if (activityImpl1.getStartTime().equals(
                            activityImpl2.getStartTime())) {
                        // 如果第一个节点和第二个节点开始时间相同保存
                        ActivityImpl sameActivityImpl2 = processDefinitionEntity
                                .findActivity(activityImpl2.getActivityId());
                        sameStartTimeNodes.add(sameActivityImpl2);
                    } else {
                        // 有不相同跳出循环
                        break;
                    }
                }
                List<PvmTransition> pvmTransitions = activityImpl
                        .getOutgoingTransitions();// 取出节点的所有出去的线
                for (PvmTransition pvmTransition : pvmTransitions) {
                    // 对所有的线进行遍历
                    ActivityImpl pvmActivityImpl = (ActivityImpl) pvmTransition
                            .getDestination();
                    // 如果取出的线的目标节点存在时间相同的节点里，保存该线的id，进行高亮显示
                    if (sameStartTimeNodes.contains(pvmActivityImpl)) {
                        highFlows.add(pvmTransition.getId());
                    }
                }
            }
            return highFlows;
        }

# 实现效果 #

浏览器地址栏输入

http://localhost:8080/ActivitiDemo4/first/test

**启动流程图**  
![kq2Y7Lv.png][]  
**一次审批执行**  
![fI6qy8n.png][]  
**二次审批执行**  
![AIBijUM.png][]

# 参考资料 #

[http://blog.csdn.net/daisy\_xiu/article/details/44343653][http_blog.csdn.net_daisy_xiu_article_details_44343653]

[AIBijUM.png]: http://i.imgur.com/AIBijUM.png
[kq2Y7Lv.png]: http://i.imgur.com/kq2Y7Lv.png
[fI6qy8n.png]: http://i.imgur.com/fI6qy8n.png
[http_blog.csdn.net_daisy_xiu_article_details_44343653]: http://blog.csdn.net/daisy_xiu/article/details/44343653