工作流Flowable和Spring集成時，有一個xml是用來配置ProcessEngine的信息，xml的內容如下所示：

<?xml version="1.0" encoding="UTF-8" standalone="no"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop"xmlns:context="http://www.springframework.org/schema/context" xmlns:jdbc="http://www.springframework.org/schema/jdbc"xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsdhttp://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd"><!-- Activiti begin --><bean id="processEngineConfiguration" class="com.xxx.xxx.config.ExtProcessEngineConfiguration"><property name="dataSource" ref="dataSource" /><property name="transactionManager" ref="transactionManager" /><property name="databaseSchemaUpdate" value="true" /><!-- property name="jobExecutorActivate" value="false" /--><property name="customSessionFactories"><list><bean class="com.xxx.xxx.entity.EntityManagerFactory"><constructor-arg index="0" value="org.flowable.idm.engine.impl.persistence.entity.UserEntityManager" /><constructor-arg index="1"><bean class="com.xxx.xxx.entity.SmartUserEntityManager"/></constructor-arg></bean><bean class="com.xxx.xxx.entity.EntityManagerFactory"><constructor-arg index="0" value="org.flowable.idm.engine.impl.persistence.entity.GroupEntityManager" /><constructor-arg index="1"><bean class="com.xxx.xxx.entity.SmartGroupEntityManager"/></constructor-arg></bean><bean class="com.xxx.xxx.entity.EntityManagerFactory"><constructor-arg index="0" value="org.flowable.idm.engine.impl.persistence.entity.MembershipEntityManager" /><constructor-arg index="1"><bean class="com.xxx.xxx.entity.SmartMembershipEntityManager"/></constructor-arg></bean></list></property></bean><bean id="processEngine" factory-bean="processEngineConfiguration" factory-method="buildProcessEngine" /><bean id="repositoryService" factory-bean="processEngineConfiguration" factory-method="getRepositoryService" /><bean id="runtimeService" factory-bean="processEngineConfiguration" factory-method="getRuntimeService" /><bean id="taskService" factory-bean="processEngineConfiguration" factory-method="getTaskService" /><bean id="historyService" factory-bean="processEngineConfiguration" factory-method="getHistoryService" /><bean id="managementService" factory-bean="processEngineConfiguration" factory-method="getManagementService" /><bean id="formService" factory-bean="processEngineConfiguration" factory-method="getFormService" /><bean id="identityService" factory-bean="processEngineConfiguration" factory-method="getIdentityService" /><bean id="commandExecutor" factory-bean="processEngineConfiguration" factory-method="getCommandExecutor" /><bean id="processDefinitionCache" factory-bean="processEngineConfiguration" factory-method="getProcessDefinitionCache"/></beans>

使用Spring boot之后推崇java配置取代xml配置，要對這個xml進行改造首先得搞清楚這個xml里面的內容，主要是定義了ExtProcessEngineConfiguration和它相關的屬性，

說明：?
constructor-arg：通過構造函數注入。?
property：通過setter對應的方法注入。?
factory-method：通過工廠方法來構造java Bean

創建config配置文件WorkflowConfiguration，在這個類中通過@bean的注解構造ExtProcessEngineConfiguration 類，同時設置ExtProcessEngineConfiguration 需要的幾個屬性

@Configuration public class WorkflowConfiguration {private final DataSource dataSource;private final PlatformTransactionManager transactionManager;public WorkflowConfiguration(DataSource dataSource,PlatformTransactionManager transactionManager){this.dataSource = dataSource;this.transactionManager = transactionManager;}@Beanpublic SmartUserEntityManager smartUserEntityManager() {return new SmartUserEntityManager(new ExtProcessEngineConfiguration());}@Beanpublic SmartGroupEntityManager smartGroupEntityManager() {return new SmartGroupEntityManager(new ExtProcessEngineConfiguration());}@Beanpublic SmartMembershipEntityManager smartMembershipEntityManager() {return new SmartMembershipEntityManager(new ExtProcessEngineConfiguration());}public EntityManagerFactory userEntityManagerFactory(){EntityManagerFactory entityManagerFactory = new EntityManagerFactory(UserEntityManager.class, smartUserEntityManager());return entityManagerFactory;}public EntityManagerFactory groupEntityManagerFactory(){EntityManagerFactory entityManagerFactory = new EntityManagerFactory(GroupEntityManager.class, smartGroupEntityManager());return entityManagerFactory;}public EntityManagerFactory membershipEntityManagerFactory(){EntityManagerFactory entityManagerFactory = new EntityManagerFactory(MembershipEntityManager.class, smartMembershipEntityManager());return entityManagerFactory;}@Beanpublic ExtProcessEngineConfiguration engineConfiguration(){ExtProcessEngineConfiguration engineConfiguration = new ExtProcessEngineConfiguration();engineConfiguration.setDatabaseSchemaUpdate("true");engineConfiguration.setDataSource(dataSource);engineConfiguration.setTransactionManager(transactionManager);List<SessionFactory> customSessionFactories = new ArrayList<>();customSessionFactories.add(userEntityManagerFactory());customSessionFactories.add(groupEntityManagerFactory());customSessionFactories.add(membershipEntityManagerFactory());engineConfiguration.setCustomSessionFactories(customSessionFactories);return engineConfiguration;}}

其中核心的代碼是：

@Beanpublic ExtProcessEngineConfiguration engineConfiguration()

這個方法。

其中有一個重點需要注意的地方是，在xml里面有一段：

<bean id="processEngine" factory-bean="processEngineConfiguration" factory-method="buildProcessEngine" />

這個是Spring使用實例工廠方法實例化Bean的一種方式，工作作流引擎Flowable的各個組件就是使用此方式實例化的。由于使用工廠實例化的Bean跟普通Bean不同，其返回的對象不是指定類的一個實例，其返回的是該FactoryBean的getObject方法所返回的對象。因此我們需要使用Spring Boot的方式來實例化Flowable的組件。有兩種解決方法：

自定義FactoryBean，實現FactoryBean中的getObject這個方法，返回ProcessEngine對象

使用ProcessEngineFactoryBean，推薦使用這種方式，以下為ProcessEngineFactoryBean源碼。

public class ProcessEngineFactoryBean implements FactoryBean<ProcessEngine> ..{...protected ProcessEngineImpl processEngine;public ProcessEngine getObject() throws Exception {initializeExpressionManager();initializeTransactionExternallyManaged();if (processEngineConfiguration.getBeans()==null) {processEngineConfiguration.setBeans(new SpringBeanFactoryProxyMap(applicationContext));}processEngine = (ProcessEngineImpl) processEngineConfiguration.buildProcessEngine();return processEngine;}... }

ProcessEngineFactoryBean最終返回的是processEngine對象，repositoryService、runtimeService、formService等等組件都是通過processEngine里的getXX方法獲得的。

通過WorkflowConfiguration就可以取代xml配置文件了。

在我們需要繼承flowable-restApi的時候發現需要進行權限校驗，我們可以通過下面的注解去掉security權限校驗，在啟動類上加上下面的注解：

@SpringBootApplication(exclude = {org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration.class,org.flowable.spring.boot.SecurityAutoConfiguration.class})

?

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