Activiti的心路历程：Activiti使用Java代码创建Bpmn流程信息

注意：此处使用activiti6.0版本，使用自动布局和不使用自动布局，pom坐标有差异
如果是前后端分离的项目，我建议前端使用bpmn.js来生成bpmn文件，后端只负责部署流转即可,此处代码是采用activiti提供的后端生成bpmn的方式，此种方式不常用，但可以作为技术储备

自动布局

采用activiti提供的自动布局
pom

<dependency>
	<groupId>org.activitigroupId>
	<artifactId>activiti-spring-boot-starter-basicartifactId>
	<version>${activiti.version}version>
dependency>

<dependency>
	<groupId>org.activitigroupId>
	<artifactId>activiti-json-converterartifactId>
	<version>${activiti.version}version>
	<exclusions>
		<exclusion>
			<groupId>org.activitigroupId>
			<artifactId>activiti-bpmn-modelartifactId>
		exclusion>
	exclusions>
dependency


<dependency>
	<groupId>org.activitigroupId>
	<artifactId>activiti-spring-boot-starter-basicartifactId>
	<version>${activiti.version}version>
dependency>

java代码

实现TaskListener接口【需要根据业务进行重写】【监听器的添加与否需要根据业务进行来决定】

package com.adun.listener;

import org.activiti.engine.delegate.DelegateTask;
import org.activiti.engine.delegate.TaskListener;

public class MyTaskListener implements TaskListener {

	@Override
	public void notify(DelegateTask delegateTask) {
		System.out.println(delegateTask);
		String eventName = delegateTask.getEventName();
		switch (eventName) {
		case EVENTNAME_CREATE:
			//2
			System.out.println("监听到任务创建");
			break;
		case EVENTNAME_ASSIGNMENT:
			//1
			System.out.println("监听到指定任务代理人");
			break;
		case EVENTNAME_COMPLETE:
			//3
			System.out.printf("监听到任务 %s 完成\n", delegateTask.getId());
			break;
		case EVENTNAME_DELETE:
			//4
			System.out.printf("监听到任务 %s 删除\n", delegateTask.getId());
			break;
		default:
			break;
		}
	}

}

package com.adun;

import com.adun.listener.MyTaskListener;
import org.activiti.bpmn.converter.BpmnXMLConverter;
import org.activiti.bpmn.model.*;
import org.activiti.bpmn.model.Process;
import org.activiti.engine.delegate.TaskListener;
import org.activiti.engine.delegate.event.ActivitiEvent;
import org.activiti.engine.delegate.event.ActivitiEventListener;
import org.activiti.engine.delegate.event.ActivitiEventType;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import java.io.*;
import java.lang.reflect.Array;
import java.util.*;

/**
 * @author ADUN
 * @date 2021/11/4 17:39
 */
@SpringBootTest
public class BpmnCreateTest {

    @Test
    public void generateBpmn(){
        //创建一个BPMN模型实例
        BpmnModel bpmnModel = new BpmnModel();
        //创建流程
        Process process = new Process();
        process.setId("myProcess");
        bpmnModel.getProcesses().add(process);

        //创建开始事件
        StartEvent startEvent = new StartEvent();
        startEvent.setId("startEvent");
        process.addFlowElement(startEvent);
        //设置开始事件的图形信息
        GraphicInfo graphicInfo1 = new GraphicInfo();
        graphicInfo1.setHeight(30);
        graphicInfo1.setWidth(30);
        graphicInfo1.setX(100);
        graphicInfo1.setY(140);
        bpmnModel.addGraphicInfo("startEvent",graphicInfo1);


        //创建监听器
        ActivitiListener activitiListener = new ActivitiListener();
        activitiListener.setEvent(TaskListener.EVENTNAME_CREATE);
        activitiListener.setImplementationType(ImplementationType.IMPLEMENTATION_TYPE_CLASS);
        activitiListener.setImplementation(MyTaskListener.class.getTypeName());
        List<ActivitiListener> activitiListeners = new ArrayList<>();
        activitiListeners.add(activitiListener);

        //创建任务
        UserTask task = new UserTask();
        task.setId("myTask");
        task.setTaskListeners(activitiListeners);
        process.addFlowElement(task);

        //设置任务的图形信息
        GraphicInfo graphicInfo = new GraphicInfo();
        graphicInfo.setHeight(100);
        graphicInfo.setWidth(200);
        graphicInfo.setX(200);
        graphicInfo.setY(120);
        bpmnModel.addGraphicInfo("myTask",graphicInfo);


        //创建结束事件
        EndEvent endEvent = new EndEvent();
        endEvent.setId("endEvent");
        process.addFlowElement(endEvent);
        //设置结束事件的图形信息
        GraphicInfo graphicInfo2 = new GraphicInfo();
        graphicInfo2.setHeight(30);
        graphicInfo2.setWidth(30);
        graphicInfo2.setX(500);
        graphicInfo2.setY(140);
        bpmnModel.addGraphicInfo("endEvent",graphicInfo2);

        //将元素用线连起来
        //创建线1
        SequenceFlow sequenceFlow1 = new SequenceFlow();
        sequenceFlow1.setId("mySequenceFlow1");
        sequenceFlow1.setSourceRef(startEvent.getId());
        sequenceFlow1.setTargetRef(task.getId());
        process.addFlowElement(sequenceFlow1);

        //设置线1的图形信息【可以不用设置，影响不大】
        GraphicInfo graphicInfo3 = new GraphicInfo();
        graphicInfo3.setX(135);
        graphicInfo3.setY(169);
        GraphicInfo graphicInfo4 = new GraphicInfo();
        graphicInfo4.setX(200);
        graphicInfo4.setY(170);
        List<GraphicInfo> graphicInfos1 = new ArrayList<>();
        graphicInfos1.add(graphicInfo3);
        graphicInfos1.add(graphicInfo4);
        bpmnModel.addFlowGraphicInfoList("mySequenceFlow1",graphicInfos1);

        //创建线2
        SequenceFlow sequenceFlow2 = new SequenceFlow();
        sequenceFlow2.setId("mySequenceFlow2");
        sequenceFlow2.setSourceRef(task.getId());
        sequenceFlow2.setTargetRef(endEvent.getId());
        process.addFlowElement(sequenceFlow2);

        //设置线2的图形信息【可以不用设置，影响不大】
        GraphicInfo graphicInfo5 = new GraphicInfo();
        graphicInfo5.setX(400);
        graphicInfo5.setY(170);
        GraphicInfo graphicInfo6 = new GraphicInfo();
        graphicInfo6.setX(500);
        graphicInfo6.setY(169);
        List<GraphicInfo> graphicInfos2 = new ArrayList<>();
        graphicInfos2.add(graphicInfo5);
        graphicInfos2.add(graphicInfo6);
        bpmnModel.addFlowGraphicInfoList("mySequenceFlow2",graphicInfos2);

        //XML转换器，将BPMN模型转换为XML文档
        BpmnXMLConverter converter = new BpmnXMLConverter();
        byte[] bytes = converter.convertToXML(bpmnModel);
        System.out.println(new String(bytes));

    }
}

生成的Bpmn

<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/test">
  <process id="myProcess" isExecutable="true">
    <startEvent id="startEvent">startEvent>
    <userTask id="myTask">
      <extensionElements>
        <activiti:taskListener event="create" class="com.adun.listener.MyTaskListener">activiti:taskListener>
      extensionElements>
    userTask>
    <endEvent id="endEvent">endEvent>
    <sequenceFlow id="mySequenceFlow1" sourceRef="startEvent" targetRef="myTask">sequenceFlow>
    <sequenceFlow id="mySequenceFlow2" sourceRef="myTask" targetRef="endEvent">sequenceFlow>
  process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_myProcess">
    <bpmndi:BPMNPlane bpmnElement="myProcess" id="BPMNPlane_myProcess">
      <bpmndi:BPMNShape bpmnElement="startEvent" id="BPMNShape_startEvent">
        <omgdc:Bounds height="30.0" width="30.0" x="100.0" y="140.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="myTask" id="BPMNShape_myTask">
        <omgdc:Bounds height="100.0" width="200.0" x="200.0" y="120.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endEvent" id="BPMNShape_endEvent">
        <omgdc:Bounds height="30.0" width="30.0" x="500.0" y="140.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="mySequenceFlow1" id="BPMNEdge_mySequenceFlow1">
        <omgdi:waypoint x="135.0" y="169.0">omgdi:waypoint>
        <omgdi:waypoint x="200.0" y="170.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="mySequenceFlow2" id="BPMNEdge_mySequenceFlow2">
        <omgdi:waypoint x="400.0" y="170.0">omgdi:waypoint>
        <omgdi:waypoint x="500.0" y="169.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
    bpmndi:BPMNPlane>
  bpmndi:BPMNDiagram>
definitions>