[开发工具]flowable 学习笔记(一)

发现一个学习flowable很好的教程，分享给大家。

Flowable BPMN 用户手册 (v 6.3.0)

下载flowable 6.4.0版本

参考链接

并附上完整代码及目录（已经成功运行）

目录：

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在? pom.xml 中添加依赖：

  <dependencies>
        <!--Flowable流程引擎-->
        <dependency>
            <groupId>org.flowable</groupId>
            <artifactId>flowable-engine</artifactId>
            <version>6.3.0</version>
        </dependency>
        <!--MySQL驱动，这里采用MySQL数据库，如果采用其它数据库，需要引入对应的依赖。-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.15</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.21</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.21</version>
        </dependency>
    </dependencies>

HolidayRequest.java

import org.flowable.engine.*;
import org.flowable.engine.history.HistoricActivityInstance;
import org.flowable.engine.impl.cfg.StandaloneProcessEngineConfiguration;
import org.flowable.engine.repository.Deployment;
import org.flowable.engine.repository.ProcessDefinition;
import org.flowable.engine.runtime.ProcessInstance;
import org.flowable.task.api.Task;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

public class HolidayRequest {
    public static void main( String[] args ) {
        //1、创建ProcessEngineConfiguration实例,该实例可以配置与调整流程引擎的设置
        ProcessEngineConfiguration cfg=new StandaloneProcessEngineConfiguration()
                //2、通常采用xml配置文件创建ProcessEngineConfiguration，这里直接采用代码的方式
                //3、配置数据库相关参数
                .setJdbcUrl("jdbc:mysql://localhost:3306/flowable?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2b8&nullCatalogMeansCurrent=true")
                .setJdbcUsername("root")
                .setJdbcPassword("123456")
                .setJdbcDriver("com.mysql.cj.jdbc.Driver")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);
        //4、初始化ProcessEngine流程引擎实例
        ProcessEngine processEngine=cfg.buildProcessEngine();

        //创建RepositoryService实例
        RepositoryService repositoryService=processEngine.getRepositoryService();
        //加载流程
        Deployment deployment=repositoryService.createDeployment()
                .addClasspathResource("holiday-request.bpmn20.xml")
                .deploy();

        //查询流程定义
        ProcessDefinition processDefinition=repositoryService.createProcessDefinitionQuery()
                .deploymentId(deployment.getId())
                .singleResult();
        System.out.println("Found process definition : "+processDefinition.getName());

        //1、获取流程初始化变量
        Scanner scanner = new Scanner(System.in);

        System.out.println("Who are you?");
        String employee = scanner.nextLine();

        System.out.println("How many holidays do you want to request?");
        Integer nrOfHolidays = Integer.valueOf(scanner.nextLine());

        System.out.println("Why do you need them?");
        String description = scanner.nextLine();

        //2、使用RuntimeService启动一个流程实例
        RuntimeService runtimeService=processEngine.getRuntimeService();
        Map<String, Object> variables = new HashMap<String, Object>();
        variables.put("employee", employee);
        variables.put("nrOfHolidays", nrOfHolidays);
        variables.put("description", description);
        ProcessInstance processInstance=runtimeService.startProcessInstanceByKey("holiday-request",variables);

        //通过TaskService查询 manager 组的任务
        TaskService taskService=processEngine.getTaskService();
        List<Task> tasks=taskService.createTaskQuery().taskCandidateGroup("managers").list();
        System.out.println("You have " + tasks.size() + " tasks:");
        for (int i=0; i<tasks.size(); i++) {
            System.out.println((i+1) + ") " + tasks.get(i).getName());
        }
        //使用集合下标获取特定流程实例的变量,在控制台输出
        System.out.println("Which task would you like to complete?");
        int taskIndex = Integer.valueOf(scanner.nextLine());
        Task task=tasks.get(taskIndex-1);
        Map<String,Object> processVariables=taskService.getVariables(task.getId());
        System.out.println(processVariables.get("employee") + " wants " +
                processVariables.get("nrOfHolidays") + " of holidays. Do you approve this?");

        //经理完成任务
        boolean approved=scanner.nextLine().toLowerCase().equals("y");
        variables = new HashMap<String, Object>();
        variables.put("approved", approved);
        //任务完成，并会在离开排他网关的两条路径中，基于’approved ’流程变量选择一条
        taskService.complete(task.getId(),variables);

        //获取HistoryService实例
        HistoryService historyService=processEngine.getHistoryService();
        //添加查询条件
        List<HistoricActivityInstance> activities =
                historyService.createHistoricActivityInstanceQuery()
                        //选择特定实例
                        .processInstanceId(processInstance.getId())
                        //选择已完成的
                        .finished()
                        //根据实例完成时间升序排列
                        .orderByHistoricActivityInstanceEndTime().asc()
                        .list();

        for (HistoricActivityInstance activity : activities) {
            System.out.println(activity.getActivityId() + " took "
                    + activity.getDurationInMillis() + " milliseconds");
        }
    }
}

SendRejectionMail.java

import org.flowable.engine.delegate.DelegateExecution;
import org.flowable.engine.delegate.JavaDelegate;

public class SendRejectionMail implements JavaDelegate {

    @Override
    public void execute(DelegateExecution delegateExecution) {
        System.out.println("send e-mail to employee "
                + delegateExecution.getVariable("employee"));
    }
}

CallExternalSystemDelegate.java

import org.flowable.engine.delegate.DelegateExecution;
import org.flowable.engine.delegate.JavaDelegate;


public class CallExternalSystemDelegate implements JavaDelegate {
    public void execute( DelegateExecution delegateExecution) {
        System.out.println("Calling the external system for employee "
                + delegateExecution.getVariable("employee"));
    }
}

运行截图：

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有什么问题可以在评论区讨论哦！