Activiti工作流样例教程(请假-审批流程并向用户展示工作流实时过程图)

1 配置工作流。

启动activiti-explorer并登录。（用户名：kermit；密码：kermit）

选择流程->流程设计工作区->新建模型输入流程名称进入流程设计界面，绘制流程图：

给事件和活动添加ID，并给活动分配(Assignments)代理人(assignee)：

保存退出编辑界面，处理模型选择导出模型，导出工作流文件process.bpmn20.xml。并将文件添加进项目中：

<process id="approvalprocess" isExecutable="true">
    <startEvent id="beginId"></startEvent>
    <userTask id="leaveId" name="请假申请" activiti:assignee="员工"></userTask>
    <sequenceFlow id="sid-3E778B12-F461-4ED0-B332-6711B1BF8006" sourceRef="beginId" targetRef="leaveId"></sequenceFlow>
    <userTask id="approvalId" name="总经理审批" activiti:assignee="总经理"></userTask>
    <sequenceFlow id="sid-4D19FF7E-CADE-4BA7-BC8E-FE02384B5318" sourceRef="leaveId" targetRef="approvalId"></sequenceFlow>
    <endEvent id="endId"></endEvent>
    <sequenceFlow id="sid-1D5CAC61-71D7-4A33-BD98-5FD661BE8494" sourceRef="approvalId" targetRef="endId"></sequenceFlow>
</process>

在maven中配置activiti的依赖

<dependency>
     <groupId>org.activiti</groupId>
     <artifactId>activiti-engine</artifactId>
     <version>${activiti.version}</version>
</dependency>

<dependency>
     <groupId>org.activiti</groupId>
     <artifactId>activiti-spring</artifactId>
     <version>${activiti.version}</version>
</dependency>

在Spring中配置数据源、事务管理、流程引擎及几个必要的xxxService

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
                           http://www.springframework.org/schema/tx      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

    <bean id="dataSource" class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/activiti" />
        <property name="username" value="root" />
        <property name="password" value="root" />
    </bean>

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
        <property name="dataSource" ref="dataSource" />
        <property name="transactionManager" ref="transactionManager" />
        <property name="databaseSchemaUpdate" value="true" />
        <property name="mailServerHost" value="localhost" />
        <property name="mailServerPort" value="5025" />
        <property name="jpaHandleTransaction" value="true" />
        <property name="jpaCloseEntityManager" value="true" />
        <property name="jobExecutorActivate" value="false" />
        <property name="xmlEncoding" value="utf-8" />
        <property name="labelFontName" value="宋体"></property>
        <property name="activityFontName" value="宋体"></property>
    </bean>

    <bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
        <property name="processEngineConfiguration" ref="processEngineConfiguration" />
    </bean>

    <bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService" />
    <bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService" />
    <bean id="taskService" factory-bean="processEngine" factory-method="getTaskService" />
    <bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService" />
    <bean id="managementService" factory-bean="processEngine" factory-method="getManagementService" />
    <bean id="formService" factory-bean="processEngine" factory-method="getFormService" />
    <bean id="identityService" factory-bean="processEngine" factory-method="getIdentityService" />

</beans>

2 开发工作流。

首先部署工作流文件：

@RequestMapping("/deployment")
    public void deployment(@RequestParam("resourceName")String resourceName) {
        Deployment deployment = repositoryService
                .createDeployment()
                .addClasspathResource("workflow/"+resourceName)
                .deploy();
    }

2.1 启动工作流

根据process.bpmn20.xml中配置的工作流Id启动该工作流实例，并得到该流程实例的id，保存到数据库中：

ProcessInstance pi = runtimeService.startProcessInstanceByKey(id);
String processid = pi.getId();

2.2 推进工作流

根据流程实例id找到任务代理人(assignee)的流程任务，调用complete方法完成该任务，使任务向下推进：

String processid = (String) map.get("processid");
String assignee = "员工";
Task task = taskService.createTaskQuery().processInstanceId(processid).taskAssignee(assignee).singleResult();
taskService.complete(task.getId());

继续完成下一步任务：

String processid = (String) map.get("processid");
String assignee = "总经理";
Task task = taskService.createTaskQuery().processInstanceId(processid).taskAssignee(assignee).singleResult();
taskService.complete(task.getId());

3 查看工作流

根据流程实例id找到当前流程定义实体，根据该流程定义获取流程部署的id和图形资源名称，根据其得到图形输入流，将其输出到浏览器可得到当前流程的流程图：

                String processid = (String) map.get("processid");
                ExecutionEntity execution = (ExecutionEntity) runtimeService.createExecutionQuery().processInstanceId(processid).singleResult();
                ProcessDefinitionEntity def = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
                        .getDeployedProcessDefinition(execution.getProcessDefinitionId());
                String diagramResourceName = def.getDiagramResourceName();
                InputStream is = repositoryService.getResourceAsStream(
                        def.getDeploymentId(), diagramResourceName);
                try {
                    OutputStream os = httpServletResponse.getOutputStream();
                    byte [] bs = new byte[1024];
                    int i = 0;
                    while((i=is.read(bs))!=-1){
                        os.write(bs,0,i);
                    }
                } catch (IOException e) {
                }

根据流程实例id找到当前正在执行的任务节点，得到该节点的坐标，在页面上通过坐标标示相应的提示红框：

                String processid = (String) map.get("processid");
                ExecutionEntity execution = (ExecutionEntity) runtimeService.createExecutionQuery().processInstanceId(processid).singleResult();
                String activitiId = execution.getCurrentActivityId();// 当前实例的执行到哪个节点
                ProcessDefinitionEntity def = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
                        .getDeployedProcessDefinition(execution.getProcessDefinitionId());
                List<ActivityImpl> activitiList = def.getActivities();// 获得当前任务的所有节点
                ActivityImpl actImpl = null;
                for (ActivityImpl activityImpl : activitiList) {
                    String id = activityImpl.getId();
                    if (id.equals(activitiId)) {// 获得执行到那个节点
                        actImpl = activityImpl;
                        break;
                    }
                }
                if(actImpl==null) return null;
                Map currentActivityMap=new HashMap();
                currentActivityMap.put("x",actImpl.getX());
                currentActivityMap.put("y",actImpl.getY());
                currentActivityMap.put("width",actImpl.getWidth());
                currentActivityMap.put("height",actImpl.getHeight());
                String msg=JSON.toJSONString(currentActivityMap);

页面展示当前工作流流程图：

<head>
<script type="text/javascript">
  var id="<%=id%>";
  $(function(){
    var data = U.action("/leaveApprove/nextActivityId", {pk:id});
    var json = JSON.parse(data.msg);
    $("#next").css({"position":"absolute","top":json.y,"left":json.x,"width":json.width,"height":json.height});
  });
</script>
</head>

<body>
  <img src="<%=basePath%>/leaveApprove/watch?pk=<%=id%>" />
  <div id="next" style="border: 1px red solid"></div>
</body>
</html>

效果如图：展示当前流程图，并提示正在进行中的任务。

原文链接：https://blog.csdn.net/xx_yTm/article/details/42121825