Java_Activiti5_菜鸟也来学Activiti5工作流_之入门简单例子（一）

// VacationRequest.java

/**
 * author : 冯孟活 ^_^ 
 * dates : 2015年9月1日 下午10:32:58 
 * class : 演示简单的公司请假流程
 * 
 *         一个简单的流程分三个步骤：
 *                 1、发布流程(部署流程定义)
 *                 2、启动流程实例
 *                 3、完成任务(先查询任务，后完成任务)
 *                 4、挂起、激活一个流程实例(可选)
 */
public class VacationRequest {
    public static void main(String[] args) {

        /**
         *  第一步：发布流程
         */
        ProcessEngine processEngine = ProcessEngineConfiguration // 通过流程引擎配置类来创建流程引擎
                .createProcessEngineConfigurationFromResource("activiti.cfg.xml").buildProcessEngine();
        RepositoryService repositoryService = processEngine.getRepositoryService(); // 通过流程引擎来得到知识库服务
        repositoryService.createDeployment().addClasspathResource("VacationRequest.bpmn").deploy(); // 通过只是库部署流程定义
        System.out.println("流程定义的个数="+repositoryService.createDeploymentQuery().count()); // 查询所有发布的流程定义的个数
        
        /**
         *  第二步：启动一个流程实例
         */
        /*定义Map来存放流程变量：流程变量经常会被用到，因为他们赋予来自同一个流程定义的不同流程实例
           的特别含义，简单来说，流程变量是区分流程实例的关键
        */
        Map<String, Object> variables = new HashMap<>(); // 定义一个Map来存放流程变量
        variables.put("employeeName","Kermit");
        variables.put("numberOfDays",new Integer(4));
        variables.put("vacationMotivation","I'm really tired!");
        RuntimeService runtimeService = processEngine.getRuntimeService(); // 获取运行服务
        runtimeService.startProcessInstanceByKey("vacationRequest",variables); // 通过运行服务来启动流程实例，并且设置流程变量(通过key 或者 id 部署都可以)
        System.out.println("流程实例的个数="+runtimeService.createProcessInstanceQuery().count()); // 通过运行服务来查询所有的流程实例的个数
        
        /**
         *  第三部：完成任务
         */
        TaskService taskService = processEngine.getTaskService(); // 通过流程引擎获取任务服务
        List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup("management").list(); // 通过任务服务来查询任务候选组(这是通过组来分区)
        for (Task task : tasks) { // 遍历打印任务
            System.err.println("能找到的任务="+task.getName());
        }
        Task task = tasks.get(0); // 获取第一个任务
        Map<String,Object> taskVariables = new HashMap<>(); // 定义一个Map来存放任务变量
        taskVariables.put("vacationApproved","false");
        taskVariables.put("managerMotivation","We have a tight deadline!");
        taskService.complete(task.getId(),taskVariables); // 根据Id来完成任务
        
        /**
         *  挂起，激活一个流程
         */
        /*
         * 我们可以挂起一个流程定义。当挂起流程定义时， 就不能创建新流程了（会抛出一个异常）。 
         * 可以通过RepositoryService挂起一个流程：
         */
        //repositoryService.suspendProcessDefinitionByKey("vacationRequest"); // 挂起一个流程定义
        //try{
            //runtimeService.startProcessInstanceByKey("vacationRequest"); // 启动一个流程实例
        //}catch(ActivitiException e){ // 这里会抛出一个Activiti自定义异常
            //e.printStackTrace();
        //}
        
        /*
         * 备注下：
         *         也可以挂起一个流程实例。挂起时，流程不能继续执行（比如，完成任务会抛出异常），
         * 异步操作（比如定时器）也不会执行。 挂起流程实例可以调用 runtimeService.suspendProcessInstance方法。 
         * 激活流程实例可以调用runtimeService.activateProcessInstanceXXX方法。
         */
    }
}

<!-- activiti.cfg.xml -->

<?xml version="1.0" encoding="UTF-8"?>
<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="processEngineConfiguration" class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">
        <property name="databaseSchemaUpdate" value="update"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/db_activiti?useUnicode=true&amp;characterEncoding=utf-8"/>
        <property name="jdbcDriver" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUsername" value="root"/>
        <property name="jdbcPassword" value="root"/>
        <property name="jobExecutorActivate" value="true"/>
    </bean>
    
</beans>

<!-- VacationRequest.bpmn -->
<?xml version="1.0" encoding="UTF-8" ?>
<definitions id="definitions"
             targetNamespace="http://activiti.org/bpmn20"
             xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:activiti="http://activiti.org/bpmn">

  <process id="vacationRequest" name="Vacation request">

    <startEvent id="request" activiti:initiator="employeeName">
      <extensionElements>
        <activiti:formProperty id="numberOfDays" name="Number of days" type="long" value="1" required="true"/>
        <activiti:formProperty id="startDate" name="First day of holiday (dd-MM-yyy)" datePattern="dd-MM-yyyy hh:mm" type="date" required="true" />
        <activiti:formProperty id="vacationMotivation" name="Motivation" type="string" />
      </extensionElements>
    </startEvent>
    <sequenceFlow id="flow1" sourceRef="request" targetRef="handleRequest" />

    <userTask id="handleRequest" name="Handle vacation request" >
      <documentation>
        ${employeeName} would like to take ${numberOfDays} day(s) of vacation (Motivation: ${vacationMotivation}).
      </documentation>
      <extensionElements>
         <activiti:formProperty id="vacationApproved" name="Do you approve this vacation" type="enum" required="true">
          <activiti:value id="true" name="Approve" />
          <activiti:value id="false" name="Reject" />
        </activiti:formProperty>
        <activiti:formProperty id="managerMotivation" name="Motivation" type="string" />
      </extensionElements>
      <potentialOwner>
        <resourceAssignmentExpression>
          <formalExpression>management</formalExpression>
        </resourceAssignmentExpression>
      </potentialOwner>
    </userTask>
    <sequenceFlow id="flow2" sourceRef="handleRequest" targetRef="requestApprovedDecision" />

    <exclusiveGateway id="requestApprovedDecision" name="Request approved?" />
    <sequenceFlow id="flow3" sourceRef="requestApprovedDecision" targetRef="sendApprovalMail">
      <conditionExpression xsi:type="tFormalExpression">${vacationApproved == 'true'}</conditionExpression>
    </sequenceFlow>

    <task id="sendApprovalMail" name="Send confirmation e-mail" />
    <sequenceFlow id="flow4" sourceRef="sendApprovalMail" targetRef="theEnd1" />
    <endEvent id="theEnd1" />

    <sequenceFlow id="flow5" sourceRef="requestApprovedDecision" targetRef="adjustVacationRequestTask">
      <conditionExpression xsi:type="tFormalExpression">${vacationApproved == 'false'}</conditionExpression>
    </sequenceFlow>

    <userTask id="adjustVacationRequestTask" name="Adjust vacation request">
      <documentation>
        Your manager has disapproved your vacation request for ${numberOfDays} days.
        Reason: ${managerMotivation}
      </documentation>
      <extensionElements>
        <activiti:formProperty id="numberOfDays" name="Number of days" value="${numberOfDays}" type="long" required="true"/>
        <activiti:formProperty id="startDate" name="First day of holiday (dd-MM-yyy)" value="${startDate}" datePattern="dd-MM-yyyy hh:mm" type="date" required="true" />
        <activiti:formProperty id="vacationMotivation" name="Motivation" value="${vacationMotivation}" type="string" />
        <activiti:formProperty id="resendRequest" name="Resend vacation request to manager?" type="enum" required="true">
          <activiti:value id="true" name="Yes" />
          <activiti:value id="false" name="No" />
        </activiti:formProperty>
      </extensionElements>
      <humanPerformer>
        <resourceAssignmentExpression>
          <formalExpression>${employeeName}</formalExpression>
        </resourceAssignmentExpression>
      </humanPerformer>
    </userTask>
    <sequenceFlow id="flow6" sourceRef="adjustVacationRequestTask" targetRef="resendRequestDecision" />

    <exclusiveGateway id="resendRequestDecision" name="Resend request?" />
    <sequenceFlow id="flow7" sourceRef="resendRequestDecision" targetRef="handleRequest">
      <conditionExpression xsi:type="tFormalExpression">${resendRequest == 'true'}</conditionExpression>
    </sequenceFlow>

     <sequenceFlow id="flow8" sourceRef="resendRequestDecision" targetRef="theEnd2">
      <conditionExpression xsi:type="tFormalExpression">${resendRequest == 'false'}</conditionExpression>
    </sequenceFlow>
    <endEvent id="theEnd2" />

  </process>

</definitions>