flowable 6.1.2 命令行完成请假审批流程的例子

一、创建 eclipse maven新项目

1、设置项目选项

其中，Create a simple project 要选中。

2、填写项目包名和项目名称

这里的Group id:必须是 org.flowable （后面的流程配置文件需要用到这个包路径）

二、添加项目maven依赖

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
    <groupId>org.flowablegroupId>
    <artifactId>HolidayRequestartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <dependencies>
        <dependency>
            <groupId>org.flowablegroupId>
            <artifactId>flowable-engineartifactId>
            <version>6.1.2version>
        dependency>
        <dependency>
            <groupId>com.h2databasegroupId>
            <artifactId>h2artifactId>
            <version>1.3.176version>
        dependency>
        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-apiartifactId>
            <version>1.7.21version>
        dependency>
        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-log4j12artifactId>
            <version>1.7.21version>
        dependency>
    dependencies>
project>

三、创建Java运行入口

package org.flowable;

public class HolidayRequest {

  public static void main(String[] args) {

  }

}

四、创建流程配置文件

src/main/resources/holiday-request.bpmn20.xml

<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: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" xmlns:flowable="http://flowable.org/bpmn"
    typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath"
    targetNamespace="http://www.flowable.org/processdef">

    <process id="holidayRequest" name="Holiday Request"
        isExecutable="true">

        <startEvent id="startEvent" />
        <sequenceFlow sourceRef="startEvent" targetRef="approveTask" />

        <userTask id="approveTask" name="Approve or reject request" flowable:candidateGroups="managers"/>
        <sequenceFlow sourceRef="approveTask" targetRef="decision" />

        <exclusiveGateway id="decision" />
        <sequenceFlow sourceRef="decision" targetRef="externalSystemCall">
            <conditionExpression xsi:type="tFormalExpression">
        
            conditionExpression>
        sequenceFlow>
        <sequenceFlow sourceRef="decision" targetRef="sendRejectionMail">
            <conditionExpression xsi:type="tFormalExpression">
        
            conditionExpression>
        sequenceFlow>

        <serviceTask id="externalSystemCall" name="Enter holidays in external system"
            flowable:class="org.flowable.CallExternalSystemDelegate" />
        <sequenceFlow sourceRef="externalSystemCall" targetRef="holidayApprovedTask" />

        <userTask id="holidayApprovedTask" name="Holiday approved" flowable:assignee="${employee}"/>
        <sequenceFlow sourceRef="holidayApprovedTask" targetRef="approveEnd" />

        <serviceTask id="sendRejectionMail" name="Send out rejection email"
            flowable:class="org.flowable.SendRejectionMail" />
        <sequenceFlow sourceRef="sendRejectionMail" targetRef="rejectEnd" />

        <endEvent id="approveEnd" />

        <endEvent id="rejectEnd" />

    process>

definitions>

五、创建log配置文件

src/main/resources/log4j.properties

log4j.rootLogger=DEBUG, CA

log4j.appender.CA=org.apache.log4j.ConsoleAppender
log4j.appender.CA.layout=org.apache.log4j.PatternLayout
log4j.appender.CA.layout.ConversionPattern= %d{hh:mm:ss,SSS} [%t] %-5p %c %x - %m%n

六、创建Java代理类

这个类在前面的流程配置中被设置为id = externalSystemCall 的 serviceTask 的执行类。

package org.flowable;

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

public class CallExternalSystemDelegate implements JavaDelegate {

    public void execute(DelegateExecution execution) {
        System.out.println("Calling the external system for employee "
            + execution.getVariable("employee"));
    }

}

七、完成代码逻辑

package holidy;

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

import org.flowable.engine.HistoryService;
import org.flowable.engine.ProcessEngine;
import org.flowable.engine.ProcessEngineConfiguration;
import org.flowable.engine.RepositoryService;
import org.flowable.engine.RuntimeService;
import org.flowable.engine.TaskService;
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.engine.task.Task;

public class HolidayRequest {

    public static void main(String[] args) {

        // 创建流程引擎相关数据库表
        ProcessEngineConfiguration cfg = new StandaloneProcessEngineConfiguration()
                .setJdbcUrl("jdbc:h2:mem:flowable;DB_CLOSE_DELAY=-1").setJdbcUsername("sa").setJdbcPassword("")
                .setJdbcDriver("org.h2.Driver")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);

        ProcessEngine processEngine = cfg.buildProcessEngine();

        // 设计好的流程部署到流程引擎中（数据库）
        RepositoryService repositoryService = processEngine.getRepositoryService();
        Deployment deployment = repositoryService.createDeployment().addClasspathResource("holiday-request.bpmn20.xml")
                .deploy();

        // 根据流程ID查找已经部署的流程
        ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()
                .deploymentId(deployment.getId()).singleResult();
        System.out.println(" 发现定义的流程 : " + processDefinition.getName());

        // 模拟请假流程，输入相关的参数
        Scanner scanner = new Scanner(System.in);

        // 请假人
        System.out.println("你是谁?");
        String employee = scanner.nextLine();

        // 请假天数
        System.out.println("你要请几天假?");
        Integer nrOfHolidays = Integer.valueOf(scanner.nextLine());

        // 请假理由
        System.out.println("请假理由?");
        String description = scanner.nextLine();

        // 流程引擎服务
        RuntimeService runtimeService = processEngine.getRuntimeService();

        Map variables = new HashMap();
        variables.put("employee", employee);
        variables.put("nrOfHolidays", nrOfHolidays);
        variables.put("description", description);

        // 构建流程运行参数，启动流程
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("holidayRequest", variables);

        // 获取待办任务列表
        TaskService taskService = processEngine.getTaskService();
        List tasks = taskService.createTaskQuery().taskCandidateGroup("managers").list();
        System.out.println("你有 " + tasks.size() + " 个待办任务:");
        for (int i = 0; i < tasks.size(); i++) {
            System.out.println((i + 1) + ") " + tasks.get(i).getName());
        }

        // 任务选择
        System.out.println("请选择你要处理的任务ID?");
        int taskIndex = Integer.valueOf(scanner.nextLine());
        Task task = tasks.get(taskIndex - 1);
        Map processVariables = taskService.getVariables(task.getId());

        // 流程审批
        System.out.println(processVariables.get("employee") + " 要请 " + processVariables.get("nrOfHolidays")
                + " 天假. 是否同意? 同意回复 y ");

        boolean approved = scanner.nextLine().toLowerCase().equals("y");
        variables = new HashMap();
        variables.put("approved", approved);
        taskService.complete(task.getId(), variables);

        // 审批历史数据
        HistoryService historyService = processEngine.getHistoryService();
        List activities = historyService.createHistoricActivityInstanceQuery()
                .processInstanceId(processInstance.getId()).finished().orderByHistoricActivityInstanceEndTime().asc()
                .list();

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

}