activiti 实时流程图追踪 springboot

https://cloud.tencent.com/developer/article/1165460

https://blog.csdn.net/m0_37222746/article/details/73321680

 

springboot 与 activiti 参考 另一个blog

有接触过activiti的朋友可能知道，在activiti5.x的追踪流程节点查找，可以用

ActivityImpl这个类来实现，可惜在activiti6版本，pvm包整个类包都被删除，再也没有ActivityImpl这个类。这给流程图追踪造成一定的麻烦，不过没关系，本章节就是教大家如何用activiti6来生成实时流程图追踪。

生成流程图核心类

主要是利用ProcessDiagramGenerator这个接口实现类，去实现generateDiagram这个方法。默认可以采用ProcessDiagramGenerator的子类

DefaultProcessDiagramGenerator调用generateDiagram实现流程图。当然也可以自定义相应的子类CustomProcessDiagramGenerator去定制化实现

 

生成流程图核心方法

public InputStream generateDiagram(BpmnModel bpmnModel, String imageType, List<String> highLightedActivities, List<String> highLightedFlows, 
      String activityFontName, String labelFontName, String annotationFontName, ClassLoader customClassLoader, double scaleFactor;

看这个方法，我们显然要关注的是bpmnmodel，highLightedActivities，highLightedFlows

这三个字段值

bpmnmodel：bpmn模型，这个简单，调用

BpmnModel bpmnModel = repositoryService.getBpmnModel(historicProcessInstance.getProcessDefinitionId());

调用默认api就可以获取。相对有点繁琐是

highLightedActivities（需要高亮的执行流程节点集合的获取）以及

highLightedFlows（需要高亮流程连接线集合的获取）。

 

上代码

package com.zte.activi.controller;

import io.swagger.annotations.Api;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.bpmn.model.FlowNode;
import org.activiti.bpmn.model.SequenceFlow;
import org.activiti.engine.*;
import org.activiti.engine.history.HistoricActivityInstance;
import org.activiti.engine.history.HistoricProcessInstance;
import org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.activiti.image.ProcessDiagramGenerator;
import org.activiti.spring.ProcessEngineFactoryBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.CollectionUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author zcy
 * @version 2019/9/23
 *          Created by zcy on 2019/9/23.
 */
@Controller
@RequestMapping("/draw")
@Api("draw")
public class DrawController {
    @Autowired
    private RepositoryService repositoryService;
    @Autowired
    private RuntimeService runtimeService;
    @Autowired
    private TaskService taskService;

    @Autowired
    private HistoryService historyService;

    @Autowired
    ProcessEngineFactoryBean processEngine;
    @Autowired
    ProcessEngineConfiguration processEngineConfiguration;

    @RequestMapping("queryProPlan.html")
    public void queryProPlan(HttpServletRequest request, HttpServletResponse response) throws Exception {
        String processInstanceId = "50023";  //57510   65037 50023
        //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>();
        for(HistoricActivityInstance tempActivity : highLightedActivitList){
            String activityId = tempActivity.getActivityId();
            highLightedActivitis.add(activityId);
        }

        //高亮线路id集合
        //List<String> highLightedFlows = getHighLightedFlows(bpmnModel,highLightedActivitList);

        List<String> highLightedFlows =  getHighLightedFlows(bpmnModel,definitionEntity,highLightedActivitList);

        //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","微软雅黑","黑体",null,2.0);
        //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 historicActivityInstances
     * @return
     */
    private static List<String> getHighLightedFlows(BpmnModel bpmnModel, List<HistoricActivityInstance> historicActivityInstances) {
        // 高亮流程已发生流转的线id集合
        List<String> highLightedFlowIds = new ArrayList<>();
        // 全部活动节点
        List<FlowNode> historicActivityNodes = new ArrayList<>();
        // 已完成的历史活动节点
        List<HistoricActivityInstance> finishedActivityInstances = new ArrayList<>();

        for (HistoricActivityInstance historicActivityInstance : historicActivityInstances) {
            FlowNode flowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(historicActivityInstance.getActivityId(), true);
            historicActivityNodes.add(flowNode);
            if (historicActivityInstance.getEndTime() != null) {
                finishedActivityInstances.add(historicActivityInstance);
            }
        }

        FlowNode currentFlowNode = null;
        FlowNode targetFlowNode = null;
        // 遍历已完成的活动实例，从每个实例的outgoingFlows中找到已执行的
        for (HistoricActivityInstance currentActivityInstance : finishedActivityInstances) {
            // 获得当前活动对应的节点信息及outgoingFlows信息
            currentFlowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(currentActivityInstance.getActivityId(), true);
            List<SequenceFlow> sequenceFlows = currentFlowNode.getOutgoingFlows();

            /**
             * 遍历outgoingFlows并找到已已流转的 满足如下条件认为已已流转： 1.当前节点是并行网关或兼容网关，则通过outgoingFlows能够在历史活动中找到的全部节点均为已流转 2.当前节点是以上两种类型之外的，通过outgoingFlows查找到的时间最早的流转节点视为有效流转
             */
            if ("parallelGateway".equals(currentActivityInstance.getActivityType()) || "inclusiveGateway".equals(currentActivityInstance.getActivityType())) {
                // 遍历历史活动节点，找到匹配流程目标节点的
                for (SequenceFlow sequenceFlow : sequenceFlows) {
                    targetFlowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(sequenceFlow.getTargetRef(), true);
                    if (historicActivityNodes.contains(targetFlowNode)) {
                        highLightedFlowIds.add(targetFlowNode.getId());
                    }
                }
            } else {
                List<Map<String, Object>> tempMapList = new ArrayList<>();
                for (SequenceFlow sequenceFlow : sequenceFlows) {
                    for (HistoricActivityInstance historicActivityInstance : historicActivityInstances) {
                        if (historicActivityInstance.getActivityId().equals(sequenceFlow.getTargetRef())) {
                            Map<String, Object> map = new HashMap<>();
                            map.put("highLightedFlowId", sequenceFlow.getId());
                            map.put("highLightedFlowStartTime", historicActivityInstance.getStartTime().getTime());
                            tempMapList.add(map);
                        }
                    }
                }

                if (!CollectionUtils.isEmpty(tempMapList)) {
                    // 遍历匹配的集合，取得开始时间最早的一个
                    long earliestStamp = 0L;
                    String highLightedFlowId = null;
                    for (Map<String, Object> map : tempMapList) {
                        long highLightedFlowStartTime = Long.valueOf(map.get("highLightedFlowStartTime").toString());
                        if (earliestStamp == 0 || earliestStamp >= highLightedFlowStartTime) {
                            highLightedFlowId = map.get("highLightedFlowId").toString();
                            earliestStamp = highLightedFlowStartTime;
                        }
                    }

                    highLightedFlowIds.add(highLightedFlowId);
                }

            }

        }
        return highLightedFlowIds;
    }


    public List<String> getHighLightedFlows(BpmnModel bpmnModel,ProcessDefinitionEntity processDefinitionEntity,List<HistoricActivityInstance> historicActivityInstances)
    {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //24小时制
        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
            // 得到节点定义的详细信息
            FlowNode activityImpl = (FlowNode)bpmnModel.getMainProcess().getFlowElement(historicActivityInstances.get(i).getActivityId());


            List<FlowNode> sameStartTimeNodes = new ArrayList<FlowNode>();// 用以保存后续开始时间相同的节点
            FlowNode sameActivityImpl1 = null;

            HistoricActivityInstance activityImpl_ = historicActivityInstances.get(i);// 第一个节点
            HistoricActivityInstance activityImp2_ ;

            for(int k = i + 1 ; k <= historicActivityInstances.size() - 1; k++)
            {
                activityImp2_ = historicActivityInstances.get(k);// 后续第1个节点

                if ( activityImpl_.getActivityType().equals("userTask") && activityImp2_.getActivityType().equals("userTask") &&
                        df.format(activityImpl_.getStartTime()).equals(df.format(activityImp2_.getStartTime()))   ) //都是usertask，且主节点与后续节点的开始时间相同，说明不是真实的后继节点
                {

                }
                else
                {
                    sameActivityImpl1 = (FlowNode)bpmnModel.getMainProcess().getFlowElement(historicActivityInstances.get(k).getActivityId());//找到紧跟在后面的一个节点
                    break;
                }

            }
            sameStartTimeNodes.add(sameActivityImpl1); // 将后面第一个节点放在时间相同节点的集合里
            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 (df.format(activityImpl1.getStartTime()).equals(df.format(activityImpl2.getStartTime()))  )
                {// 如果第一个节点和第二个节点开始时间相同保存
                    FlowNode sameActivityImpl2 = (FlowNode)bpmnModel.getMainProcess().getFlowElement(activityImpl2.getActivityId());
                    sameStartTimeNodes.add(sameActivityImpl2);
                }
                else
                {// 有不相同跳出循环
                    break;
                }
            }
            List<SequenceFlow> pvmTransitions = activityImpl.getOutgoingFlows() ; // 取出节点的所有出去的线

            for (SequenceFlow pvmTransition : pvmTransitions)
            {// 对所有的线进行遍历
                FlowNode pvmActivityImpl = (FlowNode)bpmnModel.getMainProcess().getFlowElement( pvmTransition.getTargetRef());// 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;

    }

}