工作流的整体步骤：
（1）创建工作流引擎
（2）获得activiti相关的任务：引擎API是与Activiti交互最常用的方式。主要的出发点是ProcessEngine，由ProcessEngine，可以获取到含有工作流/BPM方法的不同服务。ProcessEngine以及那些服务对象都是线程安全的。
代码：
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ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
RuntimeService runtimeService = processEngine.getRuntimeService();
RepositoryService repositoryService = processEngine.getRepositoryService();
TaskService taskService = processEngine.getTaskService();
ManagementService managementService = processEngine.getManagementService();
IdentityService identityService = processEngine.getIdentityService();
HistoryService historyService = processEngine.getHistoryService();
FormService formService = processEngine.getFormService();
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（4）获得与自己相关的某些任务
（5）声明某个任务：
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taskService.claim(task.getId(),
"fozzie"
);
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（6）完成某个任务
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public
class
TenMinuteTutorial {
public
static
void
main(String[] args) {
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（创建activiti工作引擎）
// Create Activiti process engine
ProcessEngine processEngine = ProcessEngineConfiguration
.createStandaloneProcessEngineConfiguration()
.buildProcessEngine();
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（
2
）获得activiti相关服务
// Get Activiti services
RepositoryService repositoryService = processEngine.getRepositoryService();
RuntimeService runtimeService = processEngine.getRuntimeService();
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（
3
）部署流程定义
// Deploy the process definition
repositoryService.createDeployment()
.addClasspathResource(
"FinancialReportProcess.bpmn20.xml"
)
.deploy();
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（
4
）开启一个流程实例
// Start a process instance
String procId = runtimeService.startProcessInstanceByKey(
"financialReport"
).getId();
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（
5
）获得与自己相关的某些任务
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// Get the first task
TaskService taskService = processEngine.getTaskService();
List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup(
"accountancy"
).list();
for
(Task task : tasks) {
System.out.println(
"Following task is available for accountancy group: "
+ task.getName());
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（
6
）声明某个任务
// claim it
taskService.claim(task.getId(),
"fozzie"
);
}
// Verify Fozzie can now retrieve the task
tasks = taskService.createTaskQuery().taskAssignee(
"fozzie"
).list();
for
(Task task : tasks) {
System.out.println(
"Task for fozzie: "
+ task.getName());
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（
7
）完成某个任务
// Complete the task
taskService.complete(task.getId());
}
System.out.println(
"Number of tasks for fozzie: "
+ taskService.createTaskQuery().taskAssignee(
"fozzie"
).count());
// Retrieve and claim the second task
tasks = taskService.createTaskQuery().taskCandidateGroup(
"management"
).list();
for
(Task task : tasks) {
System.out.println(
"Following task is available for accountancy group: "
+ task.getName());
taskService.claim(task.getId(),
"kermit"
);
}
// Completing the second task ends the process
for
(Task task : tasks) {
taskService.complete(task.getId());
}
// verify that the process is actually finished
HistoryService historyService = processEngine.getHistoryService();
HistoricProcessInstance historicProcessInstance =
historyService.createHistoricProcessInstanceQuery().processInstanceId(procId).singleResult();
System.out.println(
"Process instance end time: "
+ historicProcessInstance.getEndTime());
}
}
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