SpringBoot整合Activiti7的实现代码

Activiti7发布正式版之后，它与SpringBoot2.x已经完全支持整合开发。我们可以将Activiti7与SpringBoot整合开发的坐标引入到工程中，从而达到SpringBoot支持Activti7整合。

1.使用IDEA创建SpringBoot项目

在工程的pom.xml文件中引入相关的依赖，具体依赖如下所示

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.example</groupId>
  <artifactId>activiti</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>activiti</name>
  <description>Demo project for Spring Boot</description>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.activiti</groupId>
      <artifactId>activiti-spring-boot-starter</artifactId>
      <version>7.0.0.Beta2</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.5</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.27</version>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>

</project>

2.application.yml文件配置

为了能够实现Activiti7生成的表放到Mysql数据库中，需要在配置文件application.yml中添加相关的配置

server:
port: 8085
spring:
application:
name: spring-activiti
datasource:
url: jdbc:mysql://localhost:3306/activiti?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT&nullCatalogMeansCurrent=true
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver
activiti:
#1.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
#2.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
#3.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）
#4.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）
database-schema-update: true
#检测历史表是否存在
db-history-used: true
#记录历史等级可配置的历史级别有none, activity, audit, full
history-level: full
#校验流程文件，默认校验resources下的processes文件夹里的流程文件
check-process-definitions: false

3.添加SpringSecurity安全框架整合配置

Activiti7与SpringBoot整合后，默认情况下，集成了SpringSecurity安全框架，这样我们就要去准备SpringSecurity整合进来的相关用户权限配置信息

1）添加SecurityUtil类

为了能够快速实现SpringSecurity安全框架的配置，所添加的一个组件。

@Component
public class SecurityUtil {

  private Logger logger = LoggerFactory.getLogger(SecurityUtil.class);

  @Autowired
  @Qualifier("myUserDetailsService")
  private UserDetailsService userDetailsService;

  public void logInAs(String username) {

    UserDetails user = userDetailsService.loadUserByUsername(username);
    if (user == null) {
      throw new IllegalStateException("User " + username + " doesn't exist, please provide a valid user");
    }
    logger.info("> Logged in as: " + username);
    SecurityContextHolder.setContext(new SecurityContextImpl(new Authentication() {
      @Override
      public Collection<? extends GrantedAuthority> getAuthorities() {
        return user.getAuthorities();
      }

      @Override
      public Object getCredentials() {
        return user.getPassword();
      }

      @Override
      public Object getDetails() {
        return user;
      }

      @Override
      public Object getPrincipal() {
        return user;
      }

      @Override
      public boolean isAuthenticated() {
        return true;
      }

      @Override
      public void setAuthenticated(boolean isAuthenticated) throws IllegalArgumentException {

      }

      @Override
      public String getName() {
        return user.getUsername();
      }
    }));
    org.activiti.engine.impl.identity.Authentication.setAuthenticatedUserId(username);
  }
}

这个类可以从Activiti7官方提供的Example中找到。

2）添加DemoApplicationConfig类

它的作用是为了实现SpringSecurity框架的用户权限的配置，这样我们就可以在系统中使用用户权限信息

@Configuration
public class DemoApplicationConfiguration {

  private Logger logger = LoggerFactory.getLogger(DemoApplicationConfiguration.class);

  @Bean
  public UserDetailsService myUserDetailsService() {

    InMemoryUserDetailsManager inMemoryUserDetailsManager = new InMemoryUserDetailsManager();

    String[][] usersGroupsAndRoles = {
        {"salaboy", "password", "ROLE_ACTIVITI_USER", "GROUP_activitiTeam"},
        {"ryandawsonuk", "password", "ROLE_ACTIVITI_USER", "GROUP_activitiTeam"},
        {"erdemedeiros", "password", "ROLE_ACTIVITI_USER", "GROUP_activitiTeam"},
        {"other", "password", "ROLE_ACTIVITI_USER", "GROUP_otherTeam"},
        {"system", "password", "ROLE_ACTIVITI_USER"},
        {"admin", "password", "ROLE_ACTIVITI_ADMIN"},
    };

    for (String[] user : usersGroupsAndRoles) {
      List<String> authoritiesStrings = Arrays.asList(Arrays.copyOfRange(user, 2, user.length));
      logger.info("> Registering new user: " + user[0] + " with the following Authorities[" + authoritiesStrings + "]");
      inMemoryUserDetailsManager.createUser(new User(user[0], passwordEncoder().encode(user[1]),
          authoritiesStrings.stream().map(s -> new SimpleGrantedAuthority(s)).collect(Collectors.toList())));
    }


    return inMemoryUserDetailsManager;
  }


  @Bean
  public PasswordEncoder passwordEncoder() {
    return new BCryptPasswordEncoder();
  }

}

4）创建测试类

@SpringBootTest
@Slf4j
class ActivitiApplicationTests {

  @Autowired
  private ProcessEngine processEngine;

  /**
   * 流程定义的部署
   */
  @Test
  public void createDeploy() { 
    RepositoryService repositoryService = processEngine.getRepositoryService();

    Deployment deployment = repositoryService.createDeployment()
        .addClasspathResource("diagram/holiday.bpmn")//添加bpmn资源
        .addClasspathResource("diagram/holiday.png")
        .name("请假申请单流程")
        .deploy(); 
        
    log.info("流程部署id:" + deployment.getName());
    log.info("流程部署名称:" + deployment.getId());
  }
}

运行结果：

遇到的问题：

1）历史表默认不会生成，需在application.yml中配置

spring:
activiti:
#检测历史表是否存在
db-history-used: true
#记录历史等级可配置的历史级别有none, activity, audit, full
history-level: full

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