第二节：Activiti6.0配置文件的读取

<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">

    <!--流程引擎配置的bean-->
    <bean id="processEngineConfiguration" class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">

		<!--"&amp"是转义符，代表"&"-->
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/act?useSSL=false&amp;characterEncoding=UTF-8" />
        <property name="jdbcDriver" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUsername" value="root" />
        <property name="jdbcPassword" value="123456" />

		<!--该属性有三个取值，说明如下：
            1. false: false为默认值，设置为该值后， 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时， 将在启动时抛出异常。
            2. true: 设置为该值后， Activiti 会对数据库中所有的表进行更新， 如果表不存在， 则Activiti 会自动创建。
            3. create-drop: Activiti 启动时， 会执行数据库表的创建操作， 在 Activiti 关闭时， 执行数据库表的删除操作。
        -->
        <property name="databaseSchemaUpdate" value="true" />
    </bean>

</beans>

ProcessEngineConfiguration configuration =
                ProcessEngineConfiguration.createProcessEngineConfigurationFromResourceDefault();
System.out.println(configuration.getJdbcUrl());
        
//结果：jdbc:mysql://localhost:3306/act

//1.指定配置文件创建ProcessEngineConfiguration:
//Activiti会到ClassPath下查找my-activiti1.xml的配置文件，并创建名称为"processEngineConfiguration的bean
ProcessEngineConfiguration configuration1 =
                ProcessEngineConfiguration.createProcessEngineConfigurationFromResource("my-activiti1.xml");
System.out.println(configuration1.getJdbcUrl());
//结果：jdbc:mysql://localhost:3306/act

//2.指定配置文件创建ProcessEngineConfiguration,两个参数：第一个为配置文件位置，第二个为创建bean的名称
ProcessEngineConfiguration configuration2 =
                ProcessEngineConfiguration.createProcessEngineConfigurationFromResource("my-activiti2.xml","test");
System.out.println(configuration2.getJdbcUrl());
//结果：jdbc:mysql://localhost:3306/act

//读取输入流的配置,file的根目录是项目名称的位置：此处即为first-activiti
File file = new File("test/input-stream.xml");
InputStream inputStream = new FileInputStream(file);
ProcessEngineConfiguration configuration3 = ProcessEngineConfiguration.createProcessEngineConfigurationFromInputStream(inputStream);
System.out.println(configuration3.getJdbcUrl());
//结果：jdbc:mysql://localhost:3306/act

ProcessEngineConfiguration configuration4 = ProcessEngineConfiguration.createStandaloneInMemProcessEngineConfiguration();
System.out.println(configuration4.getJdbcUrl());
System.out.println(configuration4.getDatabaseSchemaUpdate());

//结果：
//jdbc:h2:mem:activiti
//create-drop

ProcessEngineConfiguration configuration5 = ProcessEngineConfiguration.createStandaloneProcessEngineConfiguration();
System.out.println(configuration5.getJdbcUrl());
System.out.println(configuration5.getDatabaseSchemaUpdate());

//结果：
//jdbc:h2:tcp://localhost/~/activiti
//false