[Java知识库]Activiti7与Spring整合

所谓与Spring整合其实就是将Activiti中核心类ProcessEngine流程引擎和一些Service类交给Spring容器来管理。

一：pom.xml

<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>

  <slf4j.version>1.6.6</slf4j.version>
  <log4j.version>1.2.12</log4j.version>
  <activiti.version>7.0.0.SR1</activiti.version>
<!--    <activiti.version>6.0.0</activiti.version>-->
</properties>

<dependencies>
  <dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-engine</artifactId>
    <version>${activiti.version}</version>
  </dependency>
  <dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-spring</artifactId>
    <version>${activiti.version}</version>
  </dependency>
  <!-- bpmn 模型处理 -->
  <dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-bpmn-model</artifactId>
    <version>${activiti.version}</version>
  </dependency>
  <!-- bpmn 转换 -->
  <dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-bpmn-converter</artifactId>
    <version>${activiti.version}</version>
  </dependency>
  <!-- bpmn json数据转换 -->
  <dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-json-converter</artifactId>
    <version>${activiti.version}</version>
  </dependency>
  <!-- bpmn 布局 -->
  <dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-bpmn-layout</artifactId>
    <version>${activiti.version}</version>
  </dependency>

  <dependency>
    <groupId>aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.5.4</version>
  </dependency>

  <!-- mysql驱动 -->
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.40</version>
  </dependency>
  <!-- mybatis -->
  <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.4.5</version>
  </dependency>
  <!-- 链接池 -->
  <dependency>
    <groupId>commons-dbcp</groupId>
    <artifactId>commons-dbcp</artifactId>
    <version>1.4</version>
  </dependency>
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>5.2.12.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>5.2.12.RELEASE</version>
  </dependency>
  <!-- log start -->
  <dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>${log4j.version}</version>
  </dependency>
  <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>${slf4j.version}</version>
  </dependency>
  <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>${slf4j.version}</version>
  </dependency>
</dependencies>

二：activiti-spring.xml

工作流引擎配置是SpringProcessEngineConfiguration，而不再是StandaloneProcessEngineConfiguration。

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
    <!-- 数据源 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/activiti"/>
        <property name="username" value="root"/>
        <property name="password" value="root123"/>
        <property name="maxActive" value="3"/>
        <property name="maxIdle" value="1"/>
    </bean>
    <!-- 工作流引擎配置bean -->
    <bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
        <!-- 数据源 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 使用spring事务管理器 -->
        <property name="transactionManager" ref="transactionManager"/>
        <!-- 数据库策略 -->
        <property name="databaseSchemaUpdate" value="true"/>
    </bean>
    <!-- 流程引擎 -->
    <bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
        <property name="processEngineConfiguration" ref="processEngineConfiguration"/>
    </bean>
    <!-- 资源服务service -->
    <bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService"/>
    <!-- 流程运行service -->
    <bean id="runtimeService" factory-bean="processEngine"  factory-method="getRuntimeService"/>
    <!-- 任务管理service -->
    <bean id="taskService" factory-bean="processEngine" factory-method="getTaskService"/>
    <!-- 历史管理service -->
    <bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService"/>
    <!-- 事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!-- 通知 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!-- 传播行为 -->
            <tx:method name="save*" propagation="REQUIRED"/>
            <tx:method name="insert*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
            <tx:method name="get*" propagation="SUPPORTS" read-only="true"/>
        </tx:attributes>
    </tx:advice>
    <!-- 切面，根据具体项目修改切点配置
    <aop:config proxy-target-class="true">
        <aop:advisor advice-ref="txAdvice"
                     pointcut="execution(*com.demo.service.impl..(..))"/>
    </aop:config>-->
</beans>

databaseSchemaUpdate的取值内容：

• flase： 默认值。activiti在启动时，会对比数据库表中保存的版本，如果没有表或者版本不匹配，将抛出异常。（生产环境常用）
• true： activiti会对数据库中所有表进行更新操作。如果表不存在，则自动创建。（开发时常用）
• create_drop： 在activiti启动时创建表，在关闭时删除表（必须手动关闭引擎，才能删除表）。（单元测试常用）
• drop-create： 在activiti启动时删除原来的旧表，然后在创建新表（不需要手动关闭引擎）。

三：测试

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:activiti-spring.xml")
 public class ActivitiTest {
     @Autowired
     private RepositoryService repositoryService;
     
     @Test
     public void test01(){
         System.out.println("检查数据库表："+repositoryService);
     }
 }

Spring工作分析：

1. 加载activiti-spring.xml配置文件

2. 加载SpringProcessEngineConfiguration对象，需要依赖注入dataSource对象和transactionManager对象。

3. 加载ProcessEngineFactoryBean工厂来创建ProcessEngine对象，需要依赖注入processEngineConfiguration对象。

4. processEngine对象来负责创建我们的XxxService对象，从而简化Activiti的开发过程。