Activiti是领先的轻量级的，以Java为中心的开源BPMN（Business Process Modeling Notation）引擎，实现了真正的流程自动化。下面介绍如何在SpringBoot环境下使用Maven集成Activiti6，来实现流程开发。

添加依赖

<dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-spring-boot-starter-basic</artifactId>
    <version>6.0.0</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

添加Processes目录

SpringBoot集成activiti默认会从classpath下的processes目录下读取流程定义文件，所以需要在src/main/resources目录下添加processes目录，并在目录中创建流程文件，添加目录后，目录结构变为：

 

如果没有processes目录，则需要修改配置spring.activiti.process-definition-location-prefix，指定流程文件存放目录。

Spring集成Activiti6默认支持**.bpmn20.xml和**.bpmn格式的流程定义文件，修改支持的文件格式，通过配置spring.activiti.process-definition-location-suffixes修改

如：

spring:
  activiti:
    check-process-definitions: true #自动检查、部署流程定义文件
    database-schema-update: true #自动更新数据库结构
    process-definition-location-prefix: classpath:/processes/ #流程定义文件存放目录
   #process-definition-location-suffixes: #流程文件格式
   #  - **.bpmn20.xml
   #  - **.bpmn

启动项目时，如果没有流程部署，就不能通过自动注入，使用RuntimeService等API，依赖注入时后报错。

ActivitiProperties中定义了activiti的自动配置项，其他配置请查看ActivitiProperties属性。

添加数据源

添加数据源，项目中添加数据源，初始化数据库结构，后续保存流程数据，

spring :
  #data source config
   datasource :
    driver : com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.105.10:3306/test_db?useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=true
    username : root
    password : mysql
    initsize : 10
    maxActive : 20
    minIdle : 10
    maxWait : 120000
    poolPreparedStatements : false
    maxOpenPreparedStatements : -1
    validationQuery : select 1
    testOnborrow : true
    testOnReturn : true
    testWhileIdle : true
    timeBetweenEvictionRunsMillis : 120000
    filters : log4j,stat

添加流程

在项目中添加流程，创建文件simple.bpmn，添加内容

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:tns="Examples" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" expressionLanguage="http://www.w3.org/1999/XPath" id="m1539757531057" name="" targetNamespace="Examples" typeLanguage="http://www.w3.org/2001/XMLSchema">
  <process id="oneTaskProcess" isClosed="false" name="The One Task Process" processType="None">
    <startEvent id="theStart"/>
    <sequenceFlow id="flow1" sourceRef="theStart" targetRef="theTask"/>
    <userTask activiti:assignee="${user}" activiti:exclusive="true" id="theTask" name="my task"/>
    <sequenceFlow id="flow2" sourceRef="theTask" targetRef="theEnd"/>
    <endEvent id="theEnd"/>
  </process>
</definitions>

启动测试

编写SpringBoot启动类，启动项目，启动项目。

@SpringBootApplication(scanBasePackages = "com.legao.server")
@EnableSwagger2
public class WorkflowServer {

    public static void main(String[] args) {

        SpringApplication.run(WorkflowServer.class, args);
    }
}

启动时，发现启动报错，

Caused by: java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy

查看activiti-spring-boot-starter-basic-6.0.0.jar发现，org.activiti.spring.boot.SecurityAutoConfiguration编译报错，这时候将SecurityAutoConfiguration排除到SpringBoot启动之外，即@SpringBootApplication注解添加exclude = SecurityAutoConfiguration.class属性

@SpringBootApplication(scanBasePackages = "com.legao.server", exclude = SecurityAutoConfiguration.class)
@EnableSwagger2
public class WorkflowServer {

    public static void main(String[] args) {

        SpringApplication.run(WorkflowServer.class, args);
    }
}

再启动发现启动正常，这时候SpringBoot集成activiti已经启动成功，查看数据库，Activiti6运行所需的28张表也已经创建成功。

ACT_EVT_LOG
ACT_GE_BYTEARRAY
ACT_GE_PROPERTY
ACT_HI_ACTINST
ACT_HI_ATTACHMENT
ACT_HI_COMMENT
ACT_HI_DETAIL
ACT_HI_IDENTITYLINK
ACT_HI_PROCINST
ACT_HI_TASKINST
ACT_HI_VARINST
ACT_ID_GROUP
ACT_ID_INFO
ACT_ID_MEMBERSHIP
ACT_ID_USER
ACT_PROCDEF_INFO
ACT_RE_DEPLOYMENT
ACT_RE_MODEL
ACT_RE_PROCDEF
ACT_RU_DEADLETTER_JOB
ACT_RU_EVENT_SUBSCR
ACT_RU_EXECUTION
ACT_RU_IDENTITYLINK
ACT_RU_JOB
ACT_RU_SUSPENDED_JOB
ACT_RU_TASK
ACT_RU_TIMER_JOB
ACT_RU_VARIABLE

（完）