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工作流程引擎之flowable(集成springboot)
作者:mmseoamin日期:2023-12-14

0、背景

现状:公司各部门业务系统有各自的工作流引擎,也有cross function的业务在不同系统或OA系统流转,没有统一的去规划布局统一的BPM解决方案,近期由于一个项目引发朝着整合统一的BPM方案,特了解一下市面上比较主流的开源和收费的工作流引擎。本文主要介绍开源的工作流引擎flowable.

1、开源工作流引擎比较

开源工作流引擎是一种用于管理和自动化业务流程的软件,它可以帮助用户实现业务流程的可视化设计、流程编排、任务调度、监控和优化等功能。本文将介绍几种常见的开源工作流引擎,并进行比较。目前市场上比较主流的开源流程引擎有:Activiti、Camunda、Flowable。

1.1、Activiti

Activiti是一个轻量级的开源工作流引擎,采用Java语言开发,基于BPMN 2.0规范,支持嵌入式部署和分布式部署。Activiti提供了丰富的API和插件,支持与Java应用程序进行集成。它还提供了Web界面和REST API,可以方便地进行流程设计、部署、调度和监控。Activiti具有以下优点:

  • 易用性和灵活性:Activiti提供了简单易用的流程设计器和API,支持多种流程模型和任务类型,可以满足不同场景和需求的使用。
  • 可伸缩性和性能:Activiti支持嵌入式和分布式部署,可以扩展集群规模以支持更大的业务流程和更高的并发量。此外,它还提供了优化和缓存机制,可以提高性能和响应速度。
  • 社区支持和生态系统:Activiti拥有庞大的社区和活跃的开发者,提供了丰富的插件和工具,可以扩展其功能和使用。例如,Activiti Explorer可以用于流程设计和管理,Camunda Modeler可以用于编辑BPMN模型,Flowable Task可以用于任务管理等。
  • 安全性和可靠性:Activiti提供了可靠的安全性控制,可以对数据进行访问控制和加密,以满足不同场景和需求的安全要求。它还提供了事务管理和错误处理机制,可以保证业务流程的可靠性和稳定性。

    1.2、Camunda

    Camunda是一个强大的开源工作流引擎,采用Java语言开发,支持BPMN 2.0规范和CMMN规范。Camunda提供了丰富的API和插件,支持与Java应用程序进行集成。它还提供了Web界面和REST API,可以方便地进行流程设计、部署、调度和监控。Camunda具有以下优点:

    • 功能丰富和灵活性:Camunda提供了丰富的功能和灵活的流程设计,支持多种流程模型和任务类型,可以满足不同场景和需求的使用。
    • 可伸缩性和性能:Camunda支持嵌入式和分布式部署,可以扩展集群规模以支持更大的业务流程和更高的并发量。此外,它还提供了优化和缓存机制,可以提高性能和响应速度。
    • 社区支持和生态系统:Camunda拥有庞大的社区和活跃的开发者,提供了丰富的插件和工具,可以扩展其功能和使用。例如,Camunda Modeler可以用于编辑BPMN模型,Camunda Cockpit可以用于任务管理和流程监控,Camunda Tasklist可以用于任务列表等。
    • 可扩展的架构和API:Camunda采用可扩展的架构和API,可以方便地进行集成和扩展。例如,它支持自定义流程引擎插件、外部任务处理器、表单引擎等。
    • 安全性和可靠性:Camunda提供了可靠的安全性控制,可以对数据进行访问控制和加密,以满足不同场景和需求的安全要求。它还提供了事务管理和错误处理机制,可以保证业务流程的可靠性和稳定性。

      1.3、Flowable

      Flowable是一个开源的轻量级工作流引擎,基于Activiti 5.x版本开发,支持BPMN 2.0规范和CMMN规范。Flowable提供了丰富的API和插件,支持与Java应用程序进行集成。它还提供了Web界面和REST API,可以方便地进行流程设计、部署、调度和监控。Flowable具有以下优点:

      • 易用性和灵活性:Flowable提供了简单易用的流程设计器和API,支持多种流程模型和任务类型,可以满足不同场景和需求的使用。
      • 可伸缩性和性能:Flowable支持嵌入式和分布式部署,可以扩展集群规模以支持更大的业务流程和更高的并发量。此外,它还提供了优化和缓存机制,可以提高性能和响应速度。
      • 社区支持和生态系统:Flowable拥有庞大的社区和活跃的开发者,提供了丰富的插件和工具,可以扩展其功能和使用。例如,Flowable Modeler可以用于流程设计和管理,Flowable Task可以用于任务管理和流程监控,Flowable Admin可以用于集群管理等。
      • 可扩展的架构和API:Flowable采用可扩展的架构和API,可以方便地进行集成和扩展。例如,它支持自定义流程引擎插件、外部任务处理器、表单引擎等。
      • 安全性和可靠性:Flowable提供了可靠的安全性控制,可以对数据进行访问控制和加密,以满足不同场景和需求的安全要求。它还提供了事务管理和错误处理机制,可以保证业务流程的可靠性和稳定性。

        2、flowable安装

        2.1、下载软件

        Github链接,目前flowable已经更新到Flowable 7.0.0.M2版本了。

        工作流程引擎之flowable(集成springboot),第1张

         安装方式有很多,可以通过下载zip包也可以通过docker拉取镜像进行部署,本文采用zip的window环境部署。

        下载安装包,我下载的是flowable-6.7.0版本,同时需要配合tomcat(选择的是apache-tomcat-9.0.79版本)服务进行部署,tomcat下载地址:

        工作流程引擎之flowable(集成springboot),第2张工作流程引擎之flowable(集成springboot),第3张

         工作流程引擎之flowable(集成springboot),第4张

         下载上面两个软件之后还需要配置flowale的配置数据存储,我选择的mysql数据库,当然他还支持其他数据库类型。mysql数据库是docker镜像运行的,这里不再赘述安装过程,可以看我往期docker mysql安装.

        2.2、解压运行

        分别解压tomcat和flowable:

        工作流程引擎之flowable(集成springboot),第5张

         工作流程引擎之flowable(集成springboot),第6张

        把flowable-6.7.0\wars目录下的flowable-ui.war拷贝到apache-tomcat-9.0.79\webapps下面启动tomcat  startup.bat

        工作流程引擎之flowable(集成springboot),第7张此时会解压war文件,同时会删除war文件,同时会生成新文件apache-tomcat-9.0.79\webapps\flowable-ui.

        2.3、配置数据源

         修改apache-tomcat-9.0.79\webapps\flowable-ui\WEB-INF\classes\flowable-default.properties

        工作流程引擎之flowable(集成springboot),第8张

         参考:

        server.port=8080
        server.servlet.context-path=/flowable-ui
        spring.jmx.unique-names=true
        # This is needed to force use of JDK proxies instead of using CGLIB
        spring.aop.proxy-target-class=false
        spring.aop.auto=false
        spring.application.name=flowable-ui
        spring.banner.location=classpath:/org/flowable/spring/boot/flowable-banner.txt
        # The default domain for generating ObjectNames must be specified. Otherwise when multiple Spring Boot applications start in the same servlet container
        # all would be created with the same name (com.zaxxer.hikari:name=dataSource,type=HikariDataSource) for example
        spring.jmx.default-domain=${spring.application.name}
        #
        # SECURITY
        #
        spring.security.filter.dispatcher-types=REQUEST,FORWARD,ASYNC
        # Expose all actuator endpoints to the web
        # They are exposed, but only authenticated users can see /info and /health abd users with access-admin can see the others
        management.endpoints.web.exposure.include=*
        # Full health details should only be displayed when a user is authorized
        management.endpoint.health.show-details=when_authorized
        # Only users with role access-admin can access full health details
        management.endpoint.health.roles=access-admin
        # Spring prefixes the roles with ROLE_. However, Flowable does not have that concept yet, so we need to override that with an empty string
        flowable.common.app.role-prefix=
        #
        # SECURITY OAuth2
        # Examples are for Keycloak
        #
        #spring.security.oauth2.resourceserver.jwt.issuer-uri=/auth/realms/
        #spring.security.oauth2.client.registration.keycloak.client-id=
        #spring.security.oauth2.client.registration.keycloak.client-secret=
        #spring.security.oauth2.client.registration.keycloak.client-name=Flowable UI Keycloak
        #spring.security.oauth2.client.registration.keycloak.authorization-grant-type=authorization_code
        #spring.security.oauth2.client.provider.keycloak.issuer-uri=/auth/realms/
        #spring.security.oauth2.client.provider.keycloak.user-name-attribute=preferred_username
        #flowable.common.app.security.type=oauth2
        #flowable.common.app.security.oauth2.authorities-attribute=groups
        #flowable.common.app.security.oauth2.groups-attribute=userGroups
        #flowable.common.app.security.oauth2.default-authorities=access-task
        #flowable.common.app.security.oauth2.default-groups=flowableUser
        #flowable.common.app.security.oauth2.full-name-attribute=name
        #flowable.common.app.security.oauth2.email-attribute=email
        #
        # DATABASE
        #
        #spring.datasource.driver-class-name=org.h2.Driver
        #spring.datasource.url=jdbc:h2:~/flowable-db/engine-db;AUTO_SERVER=TRUE;AUTO_SERVER_PORT=9093;DB_CLOSE_DELAY=-1
        spring.datasource.driver-class-name=com.mysql.jdbc.Driver
        spring.datasource.url=jdbc:mysql://192.168.56.100:13306/flowable?characterEncoding=UTF-8
        #spring.datasource.driver-class-name=org.postgresql.Driver
        #spring.datasource.url=jdbc:postgresql://localhost:5432/flowable
        #spring.datasource.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver
        #spring.datasource.url=jdbc:sqlserver://localhost:1433;databaseName=flowablea
        #spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver
        #spring.datasource.url=jdbc:oracle:thin:@localhost:1521:FLOWABLE
        #spring.datasource.driver-class-name=com.ibm.db2.jcc.DB2Driver
        #spring.datasource.url=jdbc:db2://localhost:50000/flowable
        spring.datasource.username=root
        spring.datasource.password=my-secret-pw
        # JNDI CONFIG
        # If uncommented, the datasource will be looked up using the configured JNDI name.
        # This will have preference over any datasource configuration done below that doesn't use JNDI
        #
        # Eg for JBoss: java:jboss/datasources/flowableDS
        #
        #spring.datasource.jndi-name==jdbc/flowableDS
        # Set whether the lookup occurs in a J2EE container, i.e. if the prefix "java:comp/env/" needs to be added if the JNDI
        # name doesn't already contain it. Default is "true".
        #datasource.jndi.resourceRef=true
        #
        # Connection pool (see https://github.com/brettwooldridge/HikariCP#configuration-knobs-baby)
        #
        spring.datasource.hikari.poolName=${spring.application.name}
        # 10 minutes
        spring.datasource.hikari.maxLifetime=600000
        # 5 minutes
        spring.datasource.hikari.idleTimeout=300000
        spring.datasource.hikari.minimumIdle=10
        spring.datasource.hikari.maximumPoolSize=50
        # test query for H2, MySQL, PostgreSQL and Microsoft SQL Server
        #spring.datasource.hikari.connection-test-query=select 1
        # test query for Oracle
        #spring.datasource.hikari.connection-test-query=SELECT 1 FROM DUAL
        # test query for DB2
        #spring.datasource.hikari.connection-test-query=SELECT current date FROM sysibm.sysdummy1
        #
        # Default Task Executor (will be used for @Async)
        #
        spring.task.execution.pool.core-size=2
        spring.task.execution.pool.max-size=50
        spring.task.execution.pool.queue-capacity=10000
        spring.task.execution.thread-name-prefix=flowable-ui-task-Executor-
        #
        # Task scheduling
        #
        spring.task.scheduling.pool.size=5
        #
        # EMAIL
        #
        #flowable.mail.server.host=localhost
        #flowable.mail.server.port=1025
        #flowable.mail.server.username=
        #flowable.mail.server.password=
        #
        # FLOWABLE
        #
        flowable.process.definition-cache-limit=512
        #flowable.dmn.strict-mode=false
        flowable.process.async.executor.default-async-job-acquire-wait-time=PT5S
        flowable.process.async.executor.default-timer-job-acquire-wait-time=PT5S
        flowable.cmmn.async.executor.default-async-job-acquire-wait-time=PT5S
        flowable.cmmn.async.executor.default-timer-job-acquire-wait-time=PT5S
        # The maximum file upload limit. Set to -1 to set to 'no limit'. Expressed in bytes
        spring.servlet.multipart.max-file-size=10MB
        # The maximum request size limit. Set to -1 to set to 'no limit'.
        # When multiple files can be uploaded this needs to be more than the 'max-file-size'.
        spring.servlet.multipart.max-request-size=10MB
        # For development purposes, data folder is created inside the sources ./data folder
        flowable.content.storage.root-folder=data/
        flowable.content.storage.create-root=true
        flowable.common.app.idm-admin.user=admin
        flowable.common.app.idm-admin.password=test
        flowable.experimental.debugger.enabled=false
        # Rest API in task application
        # If false, disables the rest api in the task app
        flowable.task.app.rest-enabled=true
        # Configures the way user credentials are verified when doing a REST API call:
        # 'any-user' : the user needs to exist and the password need to match. Any user is allowed to do the call (this is the pre 6.3.0 behavior)
        # 'verify-privilege' : the user needs to exist, the password needs to match and the user needs to have the 'rest-api' privilege
        # If nothing set, defaults to 'verify-privilege'
        flowable.rest.app.authentication-mode=verify-privilege
        # Enable form field validation after form submission on the engine side
        flowable.form-field-validation-enabled=false
        # Flowable Admin Properties
        # Passwords for rest endpoints and master configs are stored encrypted in the database using AES/CBC/PKCS5PADDING
        # It needs a 128-bit initialization vector (http://en.wikipedia.org/wiki/Initialization_vector)
        # and a 128-bit secret key represented as 16 ascii characters below
        #
        # Do note that if these properties are changed after passwords have been saved, all existing passwords
        # will not be able to be decrypted and the password would need to be reset in the UI.
        flowable.admin.app.security.encryption.credentials-i-v-spec=j8kdO2hejA9lKmm6
        flowable.admin.app.security.encryption.credentials-secret-spec=9FGl73ngxcOoJvmL
        #flowable.admin.app.security.preemptive-basic-authentication=true
        # Flowable IDM Properties
        #
        # LDAP
        #
        #flowable.idm.ldap.enabled=true
        #flowable.idm.ldap.server=ldap://localhost
        #flowable.idm.ldap.port=10389
        #flowable.idm.ldap.user=uid=admin, ou=system
        #flowable.idm.ldap.password=secret
        #flowable.idm.ldap.base-dn=o=flowable
        #flowable.idm.ldap.query.user-by-id=(&(objectClass=inetOrgPerson)(uid={0}))
        #flowable.idm.ldap.query.user-by-full-name-like=(&(objectClass=inetOrgPerson)(|({0}=*{1}*)({2}=*{3}*)))
        #flowable.idm.ldap.query.all-users=(objectClass=inetOrgPerson)
        #flowable.idm.ldap.query.groups-for-user=(&(objectClass=groupOfUniqueNames)(uniqueMember={0}))
        #flowable.idm.ldap.query.all-groups=(objectClass=groupOfUniqueNames)
        #flowable.idm.ldap.query.group-by-id=(&(objectClass=groupOfUniqueNames)(uniqueId={0}))
        #flowable.idm.ldap.attribute.user-id=uid
        #flowable.idm.ldap.attribute.first-name=cn
        #flowable.idm.ldap.attribute.last-name=sn
        #flowable.idm.ldap.attribute.email=mail
        #flowable.idm.ldap.attribute.group-id=cn
        #flowable.idm.ldap.attribute.group-name=cn
        #flowable.idm.ldap.cache.group-size=10000
        #flowable.idm.ldap.cache.group-expiration=180000
        #
        # Keycloak
        #
        #flowable.idm.app.keycloak.enabled=true
        #flowable.idm.app.keycloak.server=
        #flowable.idm.app.keycloak.authentication-realm=master
        #flowable.idm.app.keycloak.authentication-user=admin
        #flowable.idm.app.keycloak.authentication-password=admin
        #flowable.idm.app.keycloak.realm=
        #
        # DEFAULT ADMINISTRATOR ACCOUNT
        #
        flowable.idm.app.admin.user-id=admin
        flowable.idm.app.admin.password=test
        flowable.idm.app.admin.first-name=Test
        flowable.idm.app.admin.last-name=Administrator
        flowable.idm.app.admin.email=test-admin@example-domain.tld
        # Enable and configure JMS
        #flowable.task.app.jms-enabled=true
        #spring.activemq.broker-url=tcp://localhost:61616
        # Enable and configure RabbitMQ
        #flowable.task.app.rabbit-enabled=true
        #spring.rabbitmq.addresses=localhost:5672
        #spring.rabbitmq.username=guest
        #spring.rabbitmq.password=guest
        # Enable and configure Kafka
        #flowable.task.app.kafka-enabled=true
        #spring.kafka.bootstrap-servers=localhost:9092
        

         默认情况下flowable有没有把mysql驱动程序打入到war包里面,需要手动添加对应的驱动。apache-tomcat-9.0.79\webapps\flowable-ui\WEB-INF\lib 我选择的是mysql-connector-java-5.1.45.jar驱动,具体可以从网上下载也可以通过maven方式从中央仓库拉取。

        工作流程引擎之flowable(集成springboot),第9张

         再次启动tomcat,访问http://127.0.0.1:8080/flowable-ui 初始用户名和密码:admin/test

        3、springboot接入flowable

        登录flowable之后选择建模器应用程序,添加一个流程,我这边已经添加了一个简单的请假流程。

        工作流程引擎之flowable(集成springboot),第10张

        工作流程引擎之flowable(集成springboot),第11张

        新入门可以导入我们流程定义,具体文件在看的我资源。重点介绍springboot如何集成flowable,配置后续有机会在单独介绍里程配置说明。

        新建springboot项目添加响应的依赖。

         
                
                
                    org.springframework.boot
                    spring-boot-starter-web
                
                
                
                    org.flowable
                    flowable-spring-boot-starter
                    6.7.0
                
                
                    mysql
                    mysql-connector-java
                    5.1.45
                
                
                
                    org.slf4j
                    slf4j-api
                    1.7.21
                
                
                    org.slf4j
                    slf4j-log4j12
                    1.7.21
                
            

        工作流程引擎之flowable(集成springboot),第12张

        application.yml配置:

        spring:
          datasource:
            url: jdbc:mysql://192.168.56.100:13306/flowable?useSSL=false&characterEncoding=UTF-8&serverTimezone=GMT%2B8
            driver-class-name: com.mysql.jdbc.Driver
            username: root
            password: my-secret-pw
        # flowable 配置
        flowable:
          # 关闭异步,不关闭历史数据的插入就是异步的,会在同一个事物里面,无法回滚
          # 开发可开启会提高些效率,上线需要关闭
          async-executor-activate: false
        server:
          port: 18080

        Controller

        import liquibase.pro.packaged.O;
        import liquibase.pro.packaged.U;
        import org.flowable.bpmn.model.BpmnModel;
        import org.flowable.engine.*;
        import org.flowable.engine.history.HistoricActivityInstance;
        import org.flowable.engine.history.HistoricProcessInstance;
        import org.flowable.engine.runtime.ActivityInstance;
        import org.flowable.engine.runtime.Execution;
        import org.flowable.engine.runtime.ProcessInstance;
        import org.flowable.image.ProcessDiagramGenerator;
        import org.flowable.task.api.Task;
        import org.springframework.beans.factory.annotation.Autowired;
        import org.springframework.web.bind.annotation.GetMapping;
        import org.springframework.web.bind.annotation.RequestMapping;
        import org.springframework.web.bind.annotation.RestController;
        import javax.servlet.http.HttpServletResponse;
        import java.io.InputStream;
        import java.io.OutputStream;
        import java.util.ArrayList;
        import java.util.HashMap;
        import java.util.List;
        import java.util.Map;
        /**
         * @author pyj
         * @date 2019/10/30
         */
        @RestController
        @RequestMapping("flowable")
        public class TestController {
            @Autowired
            private RuntimeService runtimeService;
            @Autowired
            private TaskService taskService;
            @Autowired
            private HistoryService historyService;
            @Autowired
            private RepositoryService repositoryService;
            @Autowired
            private ProcessEngine processEngine;
            /**
             * 创建流程
             *
             * @param userId
             * @param days
             * @param reason
             * @return
             */
            @GetMapping("add")
            public String addExpense(String userId, String days, String reason) {
                Map map = new HashMap<>();
                map.put("employee", userId);
                map.put("nrOfHolidays", days);
                map.put("description", reason);
                ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("holidayRequest", map);
                return "提交成功,流程ID为:" + processInstance.getId();
            }
            /**
             * 获取指定用户组流程任务列表
             *
             * @return
             */
            @GetMapping("listtask")
            public Object listtask() {
                StringBuffer btf = new StringBuffer();
                List list = taskService.createTaskQuery().list();
                for (Task task : list){
                    btf.append(task.getId()+"\r\n");
                    System.out.println(task.getId());
                }
                return btf.toString();
            }
            /**
             * 获取指定用户组流程任务列表
             *
             * @param group
             * @return
             */
            @GetMapping("list")
            public Object list(String group) {
                List list = taskService.createTaskQuery().list();
                List tasks = taskService.createTaskQuery().taskCandidateGroup(group).list();
                return tasks.toString();
            }
            /**
             * 通过/拒绝任务
             *
             * @param taskId
             * @param approved 1 :true  2:false
             * @return
             */
            @GetMapping("apply")
            public String apply(String taskId, String approved) {
                Task task = taskService.createTaskQuery().taskId(taskId).singleResult();
                if (task == null) {
                    return "流程不存在";
                }
                Map variables = new HashMap<>();
                Boolean apply = approved.equals("1") ? true : false;
                variables.put("approved", apply);
                taskService.complete(taskId, variables);
                return "审批是否通过:" + approved;
            }
            /**
             * 查看历史流程记录
             *
             * @param processInstanceId
             * @return
             */
            @GetMapping("historyList")
            public Object getHistoryList(String processInstanceId) {
                List historicActivityInstances = historyService.createHistoricActivityInstanceQuery()
                        .processInstanceId(processInstanceId).finished().orderByHistoricActivityInstanceEndTime().asc().list();
                return historicActivityInstances;
            }
            /**
             * 驳回流程实例
             *
             * @param taskId
             * @param targetTaskKey
             * @return
             */
            @GetMapping("rollbask")
            public String rollbaskTask(String taskId, String targetTaskKey) {
                Task currentTask = taskService.createTaskQuery().taskId(taskId).singleResult();
                if (currentTask == null) {
                    return "节点不存在";
                }
                List key = new ArrayList<>();
                key.add(currentTask.getTaskDefinitionKey());
                runtimeService.createChangeActivityStateBuilder()
                        .processInstanceId(currentTask.getProcessInstanceId())
                        .moveActivityIdsToSingleActivityId(key, targetTaskKey)
                        .changeState();
                return "驳回成功...";
            }
            /**
             * 终止流程实例
             *
             * @param processInstanceId
             */
            public String deleteProcessInstanceById(String processInstanceId) {
                // ""这个参数本来可以写删除原因
                runtimeService.deleteProcessInstance(processInstanceId, "");
                return "终止流程实例成功";
            }
            /**
             * 挂起流程实例
             *
             * @param processInstanceId 当前流程实例id
             */
            @GetMapping("hangUp")
            public String handUpProcessInstance(String processInstanceId) {
                runtimeService.suspendProcessInstanceById(processInstanceId);
                return "挂起流程成功...";
            }
            /**
             * 恢复(唤醒)被挂起的流程实例
             *
             * @param processInstanceId 流程实例id
             */
            @GetMapping("recovery")
            public String activateProcessInstance(String processInstanceId) {
                runtimeService.activateProcessInstanceById(processInstanceId);
                return "恢复流程成功...";
            }
            /**
             * 判断传入流程实例在运行中是否存在
             *
             * @param processInstanceId
             * @return
             */
            @GetMapping("isExist/running")
            public Boolean isExistProcIntRunning(String processInstanceId) {
                ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
                if (processInstance == null) {
                    return false;
                }
                return true;
            }
            /**
             * 判断流程实例在历史记录中是否存在
             * @param processInstanceId
             * @return
             */
            @GetMapping("isExist/history")
            public Boolean isExistProcInHistory(String processInstanceId) {
                HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
                if (historicProcessInstance == null) {
                    return false;
                }
                return true;
            }
            /**
             * 我发起的流程实例列表
             *
             * @param userId
             * @return 流程实例列表
             */
            @GetMapping("myTasks")
            public List getMyStartProcint(String userId) {
                List list = historyService
                        .createHistoricProcessInstanceQuery()
                        .startedBy(userId)
                        .orderByProcessInstanceStartTime()
                        .asc()
                        .list();
                return list;
            }
            /**
             * 查询流程图
             *
             * @param httpServletResponse
             * @param processId
             * @throws Exception
             */
            @RequestMapping(value = "processDiagram")
            public void genProcessDiagram(HttpServletResponse httpServletResponse, String processId) throws Exception {
                List activityInstanceList =  runtimeService.createActivityInstanceQuery().list();
                for(ActivityInstance activityInstance : activityInstanceList){
                    System.out.println(activityInstance.getId());
                }
                System.out.println("=========================================================================");
                List list =  runtimeService.createProcessInstanceQuery().list();
                for(ProcessInstance processInstance : list){
                    System.out.println(processInstance.getId());
                }
                ProcessInstance pi = runtimeService.createProcessInstanceQuery().processInstanceId(processId).singleResult();
                //流程走完的不显示图
                if (pi == null) {
                    return;
                }
                Task task = taskService.createTaskQuery().processInstanceId(pi.getId()).singleResult();
                //使用流程实例ID,查询正在执行的执行对象表,返回流程实例对象
                String InstanceId = task.getProcessInstanceId();
                List executions = runtimeService
                        .createExecutionQuery()
                        .processInstanceId(InstanceId)
                        .list();
                //得到正在执行的Activity的Id
                List activityIds = new ArrayList<>();
                List flows = new ArrayList<>();
                for (Execution exe : executions) {
                    List ids = runtimeService.getActiveActivityIds(exe.getId());
                    activityIds.addAll(ids);
                }
                //获取流程图
                BpmnModel bpmnModel = repositoryService.getBpmnModel(pi.getProcessDefinitionId());
                ProcessEngineConfiguration engconf = processEngine.getProcessEngineConfiguration();
                ProcessDiagramGenerator diagramGenerator = engconf.getProcessDiagramGenerator();
                InputStream in = diagramGenerator.generateDiagram(bpmnModel, "png", activityIds, flows, engconf.getActivityFontName(), engconf.getLabelFontName(), engconf.getAnnotationFontName(), engconf.getClassLoader(), 1.0,true);
                OutputStream out = null;
                byte[] buf = new byte[1024];
                int legth = 0;
                try {
                    out = httpServletResponse.getOutputStream();
                    while ((legth = in.read(buf)) != -1) {
                        out.write(buf, 0, legth);
                    }
                } finally {
                    if (in != null) {
                        in.close();
                    }
                    if (out != null) {
                        out.close();
                    }
                }
            }
        }
        

        Flowable提供了几个Service接口和实现类,可以通过service拿到流程的一些定义、流转等信息。

        正如TestController里面定义的几个方法,分别是实例化流程,审批流程,查看流程等操作。如下

        实例化流程:

        工作流程引擎之flowable(集成springboot),第13张

        审批流程:

        工作流程引擎之flowable(集成springboot),第14张

        拉取当前流程任务清单:

        工作流程引擎之flowable(集成springboot),第15张

        查看流程状态:

        工作流程引擎之flowable(集成springboot),第16张

        具体大家可以参考如下文章有详细的springboot集成指引。

        Flowable BPMN 用户手册 (v 6.3.0)