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activiti学习笔记(一) 获取流程配置实例

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发布于 2018-03-08 07:07:50

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activiti获取流程配置实例

流程配置的获取方法api

流程配置的获取共有七种方法,但是只分为三类,一类是根据配置文件路径进行获取、一类是根据流文件获取、还有一类是构建一个空的实例,根据类的默认属性来获取

 /**
   * @author 郑小康
   * 流程引擎配置共有七种方法
   * 方法1 方法2调用的实际是方法3
   * 方法4 调用其实就是方法5
   * 方法6 和方法7是相同
   * */

  //方法1
  //实际调用的方法三只不过默认beanName是processEngineConfiguration，resource为activiti.cfg.xml
  public static ProcessEngineConfiguration createProcessEngineConfigurationFromResourceDefault() {
    return createProcessEngineConfigurationFromResource("activiti.cfg.xml", "processEngineConfiguration");
  }

  //方法2
  public static ProcessEngineConfiguration createProcessEngineConfigurationFromResource(String resource) {
    return createProcessEngineConfigurationFromResource(resource, "processEngineConfiguration");
  }

  //方法3
  //主要实现过程获取资源位置路径,以及beanName来获取对应的ProcessEngineConfiguration实例
  public static ProcessEngineConfiguration createProcessEngineConfigurationFromResource(String resource, String beanName) {
    return BeansConfigurationHelper.parseProcessEngineConfigurationFromResource(resource, beanName);
  }

  //方法4
  public static ProcessEngineConfiguration createProcessEngineConfigurationFromInputStream(InputStream inputStream) {
    return createProcessEngineConfigurationFromInputStream(inputStream, "processEngineConfiguration");
  }

  //方法5
  //同方法一二三相同，只不过是以文件流来创建ProcessEngineConfiguration实例
  public static ProcessEngineConfiguration createProcessEngineConfigurationFromInputStream(InputStream inputStream, String beanName) {
    return BeansConfigurationHelper.parseProcessEngineConfigurationFromInputStream(inputStream, beanName);
  }

  //方法6
  //创建一个实例,在即再手动注入数据库相关属性通过其父类ProcessEngineConfigurationImpl来进行实现
  public static ProcessEngineConfiguration createStandaloneProcessEngineConfiguration() {
    return new StandaloneProcessEngineConfiguration();
  }

  //方法7
  //继承了StandaloneProcessEngineConfiguration,只是在这个基础上设置了 databaseSchemaUpdate的属性和jdbcUrl
  public static ProcessEngineConfiguration createStandaloneInMemProcessEngineConfiguration() {
    return new StandaloneInMemProcessEngineConfiguration();
  }

流程配置的bean方法配置

第一种和第二种方法都是都是需要在配置文件中创建对应的标签元素，定义属性值，结构如下:

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans   
       http://www.springframework.org/schema/beans/spring-beans.xsd">

	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
		<property name="driverClassName">
			<value>com.mysql.jdbc.Driver</value>
		</property>
		<property name="url">
			<value>jdbc:mysql://127.0.0.1:3306/activiti-study?useUnicode=true&characterEncoding=UTF-8
			</value>
		</property>
		<property name="username">
			<value>root</value>
		</property>
		<property name="password" value="" />
	</bean>

	<bean id="processEngineConfigurationxQ"
		class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">
		<property name="dataSource" ref="dataSource" />
		<property name="databaseSchemaUpdate" value="true" />
	</bean>

</beans>

流程配置的获取过程

下面展示一些其具体获取过程，测试方法一是根据文件路径获取、测试方法二是根据文件流获取、测试方法三是通过set注入

private final String cfgXml =  System.getProperty("user.dir") + "/activiti/config/activiti.cfg.xml";
	//方法1 2 3 的实现方式
	@Test
	public void createProcessEngineConfigurationFromResource() {
		ProcessEngineConfiguration processEngineConfiguration = ProcessEngineConfiguration.createProcessEngineConfigurationFromResource(cfgXml);
		System.out.println(processEngineConfiguration);
		ProcessEngine processEngine=processEngineConfiguration.buildProcessEngine();
		System.out.println(processEngine);

		processEngineConfiguration =ProcessEngineConfiguration.createProcessEngineConfigurationFromResource(cfgXml,"processEngineConfiguration");
		System.out.println(processEngineConfiguration);
		processEngine=processEngineConfiguration.buildProcessEngine();
		System.out.println(processEngine);
	}

	//方法4 和 5实现的方法方式
	@Test
	public void createProcessEngineConfigurationFromInputStream() throws IOException {
		InputStream in = new FileInputStream(cfgXml);
		ProcessEngineConfiguration configurationFromInputStream = ProcessEngineConfiguration
				.createProcessEngineConfigurationFromInputStream(in);
		System.out.println(configurationFromInputStream);
	}

	//方法6 和 7实现的方式
	@Test
	public void createStandaloneInMemProcessEngineConfiguration() {
		ProcessEngineConfiguration pec = ProcessEngineConfiguration
				.createStandaloneInMemProcessEngineConfiguration();
		pec.setJdbcDriver("com.mysql.jdbc.Driver");
		pec.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/activiti-study?useUnicode=true&characterEncoding=UTF-8");
		pec.setJdbcUsername("root");
		pec.setJdbcPassword("");
		System.out.println(pec);
	}