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34、Spring Cloud 2.x之整合工作流Activiti

工作流在项目中非常常用，这里先来看两张图：

第一张：

第二张：

34、Spring Cloud 2.x之整合工作流Activiti

对以上两张图进行说明：

假设这两张图就是华谊兄弟的请假流程图

图的组成部分：

人物：范冰冰、冯小刚、王中军

事件（动作）：请假、批准、不批准

34、Spring Cloud 2.x之整合工作流Activiti

工作流(Workflow)：就是“业务过程的部分或整体在计算机应用环境下的自动化”，它主要解决的是“使在多个参与者之间按照某种预定义的规则传递文档、信息或任务的过程自动进行，从而实现某个预期的业务目标，或者促使此目标的实现”。目前市面上常用的工作流引擎包括jbpm、activiti和OSWorkflowOSWorkflow。

1、新建项目sc-activiti，对应的pom.xml文件如下

<?xml version="1.0" encoding="UTF-8"?>

<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>4.0.0</modelVersion>

    <groupId>com.sc</groupId>
    <artifactId>sc-activiti</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <name>sc-activiti-drools</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-spring-boot-starter-basic</artifactId>
            <version>5.22.0</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven 
                defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.0.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.7.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.20.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-jar-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

2、新建配置文件application.yml

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/sc?characterEncoding=utf8&useSSL=true
    username: root
    password: root
  activiti:
    check-process-definitions: false
  jpa:
    properties:
      hibernate:
        hbm2ddl:
          auto: update
  show-sql: true

server:
  port: 8081
  context-path: /
  session:
    timeout: 10
  tomcat:
    uri-encoding: UTF-8

3、新建请假流程文件holiday.bpmn

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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="demo2" name="My process" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="usertask1" name="请假"></userTask>
    <userTask id="usertask2" name="审批"></userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow1" sourceRef="usertask2" targetRef="endevent1"></sequenceFlow>
    <sequenceFlow id="flow2" sourceRef="usertask1" targetRef="usertask2"></sequenceFlow>
    <sequenceFlow id="flow3" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_myProcess">
    <bpmndi:BPMNPlane bpmnElement="myProcess" id="BPMNPlane_myProcess">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="130.0" y="180.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
        <omgdc:Bounds height="55.0" width="105.0" x="271.0" y="170.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask2" id="BPMNShape_usertask2">
        <omgdc:Bounds height="55.0" width="105.0" x="471.0" y="170.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="690.0" y="180.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="576.0" y="197.0"></omgdi:waypoint>
        <omgdi:waypoint x="690.0" y="197.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="376.0" y="197.0"></omgdi:waypoint>
        <omgdi:waypoint x="471.0" y="197.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3">
        <omgdi:waypoint x="165.0" y="197.0"></omgdi:waypoint>
        <omgdi:waypoint x="271.0" y="197.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

对应的bpmn文件的图形如下

34、Spring Cloud 2.x之整合工作流Activiti

4、新建springboot启动类

package sc.ad;


import org.activiti.spring.boot.SecurityAutoConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication(exclude = SecurityAutoConfiguration.class)
public class ActivitiApp {
    public static void main(String[] args)
    {
        SpringApplication.run(ActivitiApp.class, args);
    }

}

备注：一定要忽略SecurityAutoConfiguration.class，否则会出现如下异常。

34、Spring Cloud 2.x之整合工作流Activiti

5、新建一个controller，用来启动请假流程

package sc.ad.controller;

import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.repository.ProcessDefinition;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ADController {

    @Autowired
    private RepositoryService repositoryService;

    @Autowired
    private RuntimeService runtimeService;

    @Autowired
    private TaskService taskService;

    @RequestMapping("/ad")
    public void firstDemo() {

        // 根据bpmn文件部署流程
        Deployment deployment = repositoryService.createDeployment()
                .addClasspathResource("holiday.bpmn").deploy();
        // 获取流程定义
        ProcessDefinition processDefinition = repositoryService
                .createProcessDefinitionQuery()
                .deploymentId(deployment.getId()).singleResult();
        // 启动流程定义，返回流程实例
        ProcessInstance pi = runtimeService
                .startProcessInstanceById(processDefinition.getId());
        String processId = pi.getId();
        System.out.println("流程创建成功，当前流程实例ID：" + processId);

        Task task = taskService.createTaskQuery().processInstanceId(processId)
                .singleResult();
        System.out.println("第一次执行前，任务名称：" + task.getName());
        taskService.complete(task.getId());

        task = taskService.createTaskQuery().processInstanceId(processId)
                .singleResult();
        System.out.println("第二次执行前，任务名称：" + task.getName());
        taskService.complete(task.getId());

        task = taskService.createTaskQuery().processInstanceId(processId)
                .singleResult();
        System.out.println("task为null，任务执行完毕：" + task);
    }
}

6、启动项目并进行验证

查看日志，项目启动成功

34、Spring Cloud 2.x之整合工作流Activiti