1、新建spring boot 專案

使用IDEA新建一個spring boot 專案，專案結構如下：

2、增加activiti、jpa、mysql等依賴

<dependencies>
        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-spring-boot-starter-basic</artifactId>
            <version>
 
5.21.0</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>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</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-tomcat</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

3、配置資料庫連線資訊

新建一個名為spring-boot-activiti的資料庫並且在application.properties中新增如下配置資訊：

##############################################################################
#########datasource
##############################################################################
spring.datasource.url=jdbc:mysql://localhost:3306/spring-boot-activiti?characterEncoding=utf8&useSSL=true
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#自動建立、更新、驗證資料庫表結構
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.show-sql=true

4、新建activiti流程圖

這裡是通過Eclipse的activiti外掛繪製的流程圖，在圖中紅框部分新增如下程式碼：${resumeService.storeResume()}

流程圖的程式碼如下：

<?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="myProcess" name="My process" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="servicetask1"></sequenceFlow>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow2" sourceRef="servicetask1" targetRef="endevent1"></sequenceFlow>
    <serviceTask id="servicetask1" name="User Task" activiti:expression="${resumeService.storeResume()}"></serviceTask>
  </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="270.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="360.0" y="270.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="servicetask1" id="BPMNShape_servicetask1">
        <omgdc:Bounds height="55.0" width="105.0" x="210.0" y="260.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="165.0" y="287.0"></omgdi:waypoint>
        <omgdi:waypoint x="210.0" y="287.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="315.0" y="287.0"></omgdi:waypoint>
        <omgdi:waypoint x="360.0" y="287.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

圖中的任務為系統任務，當執行到該任務時系統會根據配置資訊自動執行該任務

5、新建Service介面和實現類

public interface ResumeService {
    void storeResume();
}

@Service("resumeService")
public class ResumeServiceImpl implements ResumeService {
    @Override
    public void storeResume() {
        System.out.println("任務已經執行.....................................");
    }
}

6、新建一個測試類來啟動這個流程

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = SpringBootActivitiApplication.class)
public class ActivitiTest {

    @Autowired
    RuntimeService runtimeService;

    @Test
    public void TestStartProcess() {
        Map<String, Object> variables = new HashMap<>();
        variables.put("applicantName", "John Doe");
        variables.put("email", "[email protected]");
        variables.put("phoneNumber", "123456789");
        runtimeService.startProcessInstanceByKey("myProcess", variables);
    }
}

startProcessInstanceByKey（）為根據流程ID啟動該流程的方法

7、執行完成