在SpringBoot中使用Activiti7（不使用activiti-spring-boot-starter）

将Activiti7整合进入SpringBoot中，而不使用官方提供的activiti-spring-boot-starter。

一、POM引入Activiti依赖

文件名：pom.xml

类型：Maven项目配置

作用：引入Activiti7库

<properties>
    <activiti.version>7.1.0.M6</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>

    <dependency>
        <groupId>org.activiti</groupId>
        <artifactId>activiti-bpmn-model</artifactId>
        <version>${activiti.version}</version>
    </dependency>

    <dependency>
        <groupId>org.activiti</groupId>
        <artifactId>activiti-bpmn-converter</artifactId>
        <version>${activiti.version}</version>
    </dependency>

    <dependency>
        <groupId>org.activiti</groupId>
        <artifactId>activiti-json-converter</artifactId>
        <version>${activiti.version}</version>
    </dependency>

    <dependency>
        <groupId>org.activiti</groupId>
        <artifactId>activiti-bpmn-layout</artifactId>
        <version>${activiti.version}</version>
    </dependency>
</dependencies>

二、注册Activiti相关的Bean

文件名：ApplicationConfiguration.java

类型：Spring配置注解

作用：注册ServiceBean需要使用的SpringProcessEngineConfiguration和ProcessEngineFactoryBean

import org.activiti.spring.ProcessEngineFactoryBean;
import org.activiti.spring.SpringProcessEngineConfiguration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.sql.DataSource;

@Configuration
@Order(300)
public class ApplicationConfiguration {
    private Logger logger = LoggerFactory.getLogger(ApplicationConfiguration.class);
    private DataSource dataSource;
    private PlatformTransactionManager transactionManager;

    public ApplicationConfiguration(DataSource dataSource, PlatformTransactionManager transactionManager) {
        this.dataSource = dataSource;
        this.transactionManager = transactionManager;
    }

    @Bean
    public SpringProcessEngineConfiguration processEngineConfiguration() {
        logger.info("注册Activiti流程引擎配置……");
        SpringProcessEngineConfiguration springProcessEngineConfiguration = new SpringProcessEngineConfiguration();
        springProcessEngineConfiguration.setDataSource(dataSource);
        springProcessEngineConfiguration.setTransactionManager(transactionManager);
        springProcessEngineConfiguration.setDatabaseSchemaUpdate("true");
        return springProcessEngineConfiguration;
    }

    @Bean
    public ProcessEngineFactoryBean processEngine() {
        logger.info("注册Activiti流程引擎……");
        ProcessEngineFactoryBean processEngineFactoryBean = new ProcessEngineFactoryBean();
        processEngineFactoryBean.setProcessEngineConfiguration(processEngineConfiguration());
        return processEngineFactoryBean;
    }
}

文件名：ActivitiConfiguration.java

类型：Spring配置注解

作用：注册各个ServiceBean，其中的Order注解确保在ProcessEngineBean被创建之后再执行此配置中各种服务Bean的创建。

import org.activiti.engine.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;

@Configuration
@Order(301)
public class ActivitiConfiguration {
    private Logger logger = LoggerFactory.getLogger(ActivitiConfiguration.class);
    private ProcessEngine processEngine;

    public ActivitiConfiguration(ProcessEngine processEngine) {
        this.processEngine = processEngine;
    }

    @Bean
    public RepositoryService repositoryService() {
        logger.info("注册Activiti资源服务……");
        return processEngine.getRepositoryService();
    }

    @Bean
    public RuntimeService runtimeService() {
        logger.info("注册Activiti运行时服务……");
        return processEngine.getRuntimeService();
    }

    @Bean
    public TaskService taskService() {
        logger.info("注册Activiti任务服务……");
        return processEngine.getTaskService();
    }

    @Bean
    public HistoryService historyService() {
        logger.info("注册Activiti历史服务……");
        return processEngine.getHistoryService();
    }
}

以上。