java 动态创建flowable会签模型

在Flowable中创建一个会签（multi-instance）流程模型通常涉及以下步骤：

1. 创建流程定义：使用Flowable BPMN 2.0 XML文件定义流程。
2. 设置会签任务：在流程中设置会签任务，指定参与会签的用户或组。
3. 部署流程定义：将BPMN文件部署到Flowable引擎。 以下是一个简单的例子，演示如何使用Java代码动态创建一个会签流程模型：

import org.flowable.bpmn.model.BpmnModel;
import org.flowable.bpmn.model.EndEvent;
import org.flowable.bpmn.model.FlowNode;
import org.flowable.bpmn.model.MultiInstanceLoopCharacteristics;
import org.flowable.bpmn.model.ParallelGateway;
import org.flowable.bpmn.model.Process;
import org.flowable.bpmn.model.SequenceFlow;
import org.flowable.bpmn.model.UserTask;
import org.flowable.engine.RepositoryService;
import org.flowable.engine.repository.Deployment;
import org.flowable.engine.repository.ProcessDefinition;
import org.flowable.engine.runtime.ProcessInstance;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class FlowableDemo {
    public static void main(String[] args) {
        // 获取Flowable引擎的RepositoryService
        RepositoryService repositoryService = ProcessEngineUtil.getRepositoryService();
        // 创建BPMN 2.0 XML文件对应的BpmnModel对象
        BpmnModel bpmnModel = createBpmnModel();
        // 部署BPMN文件
        Deployment deployment = repositoryService.createDeployment()
                .addBpmnModel("multiInstanceDemo.bpmn", bpmnModel)
                .deploy();
        // 获取流程定义
        ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()
                .deploymentId(deployment.getId())
                .singleResult();
        // 启动流程实例
        ProcessInstance processInstance = repositoryService.startProcessInstanceById(processDefinition.getId());
        // 输出流程实例ID
        System.out.println("ProcessInstance ID: " + processInstance.getId());
    }
    private static BpmnModel createBpmnModel() {
        BpmnModel bpmnModel = new BpmnModel();
        Process process = new Process();
        bpmnModel.setProcess(process);
        process.setId("multiInstanceDemo");
        process.setName("Multi-Instance Demo");
        // 创建用户任务
        UserTask userTask1 = new UserTask();
        userTask1.setId("userTask1");
        userTask1.setName("User Task 1");
        userTask1.setAssignee("user1");
        process.addFlowElement(userTask1);
        // 创建并行网关
        ParallelGateway parallelGateway = new ParallelGateway();
        parallelGateway.setId("parallelGateway");
        process.addFlowElement(parallelGateway);
        // 创建用户任务
        UserTask userTask2 = new UserTask();
        userTask2.setId("userTask2");
        userTask2.setName("User Task 2");
        userTask2.setAssignee("user2");
        process.addFlowElement(userTask2);
        // 创建并行网关
        ParallelGateway parallelGateway2 = new ParallelGateway();
        parallelGateway2.setId("parallelGateway2");
        process.addFlowElement(parallelGateway2);
        // 创建用户任务
        UserTask userTask3 = new UserTask();
        userTask3.setId("userTask3");
        userTask3.setName("User Task 3");
        userTask3.setAssignee("user3");
        process.addFlowElement(userTask3);
        // 创建结束事件
        EndEvent endEvent