1、使用spring的郵件封裝類

<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
<property name="host">
<value>xxxcom</value>
</property>
<property name="port">
<value>25</value>
</property>
<property name="protocol" value="smtp"/>
<property name="javaMailProperties">
<props>
<prop key="mail.smtp.auth">true</prop>
<prop key="mail.smtp.timeout">25000</prop>
</props>
</property>
<property name="username">
<value>xxx</value> <!-- 傳送者使用者名稱 -->
</property>
<property name="password">
<value>xxx</value> <!-- 傳送者密碼 -->
</property>
</bean>

2、在<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">中新增屬性

<property name="eventListeners">
<list>
<bean
class="xxx.activitimgmt.activitideploy.listeners.MyEventListener">
</bean>
</list>
</property>

3、建立監聽器，實現ActivitiEventListener介面

public class MyEventListener implements ActivitiEventListener {

@Autowired
private MailWrapper mailWrapper;//用於發郵件的類

@Override
public void onEvent(ActivitiEvent event) {
// System.out.println("Event received: " + event.getType());
if (event.getType() == ActivitiEventType.TASK_CREATED) {// 任務建立，當流程走到一個任務節點時，會進入這個條件
ActivitiEntityEvent entityEvent = (ActivitiEntityEvent) event;
TaskEntity taskEntity = (TaskEntity) entityEvent.getEntity();
// taskEntity.getAssignee()，它是ID
Set<IdentityLink> candidates = taskEntity.getCandidates();//這個是獲取候選的
for (IdentityLink identityLink : candidates) {
System.out.println(identityLink.getGroupId());// 根據identityLink.getGroupId()，這個GroupId就是流程圖中activiti:candidateGroups對應的值。用它可以查詢該組的所有使用者，然後發郵件，讓其去審批。

}
}
if (event.getType() == ActivitiEventType.TASK_ASSIGNED) {// 任務認領，按照誰先登入誰先認領的原則，認領後會給該認領的使用者發郵件
ActivitiEntityEvent entityEvent = (ActivitiEntityEvent) event;
TaskEntity taskEntity = (TaskEntity) entityEvent.getEntity();//認領後我們主要用taskEntity.getAssignee()來查詢當前使用者資訊，併發郵件
mailWrapper.sendTaskMail(taskEntity.getOwner(), taskEntity.getAssignee(), taskEntity.getName(),
event.getType());
}

if (event.getType() == ActivitiEventType.TASK_COMPLETED) {//審批完成，首先會進入下一節點，並給下一節點的使用者發郵件，之後會通過歷史流程去找到流程發起者，並將審批資訊通過郵件傳送給發起者。這裡要注意，該類不能注入historyService，因為它先於historyService存在，必須通過entityEvent.getEngineServices();去獲取。
ActivitiEntityEvent entityEvent = (ActivitiEntityEvent) event;


TaskEntity taskEntity = (TaskEntity) entityEvent.getEntity();// 這個任務是當前做完的任務，可以理解為歷史任務了
EngineServices engineServices = entityEvent.getEngineServices();
HistoryService historyService = engineServices.getHistoryService();
TaskService taskService = engineServices.getTaskService();
ProcessInstance processInstance = taskEntity.getProcessInstance();
HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery()
.processInstanceId(processInstance.getId()).singleResult();//根據流程ID獲取歷史流程
String startUserId = historicProcessInstance.getStartUserId();//獲取流程的發起人
List<HistoricTaskInstance> list = historyService.createHistoricTaskInstanceQuery()
.processInstanceId(processInstance.getId()).list();//獲取歷史歷史流程的所有任務，包括下一節點的任務，不包括下下節點的任務
String message = "";
String userId = "";
for (HistoricTaskInstance historicTaskInstance : list) {
if (historicTaskInstance.getId().equals(taskEntity.getId())) {//找出和當前完成任務ID一致的歷史任務，並從中獲取審批資訊
List<Comment> taskComments = taskService.getTaskComments(historicTaskInstance.getId());
for (Comment comment : taskComments) {
message = comment.getFullMessage();// 審批資訊
userId = comment.getUserId();// 審批人
}
}
}
mailWrapper.sendTaskMail(message, startUserId, userId, event.getType());//不要太在意這個方法，隨便寫的
}

}

@Override
public boolean isFailOnException() {
return true;//true表示列印錯誤資訊，並拋異常，否則任務會往下執行
}
}

MailWrapper中主要還是

@Autowired
private MailSender mailSender;

public void sendTaskMail(String xxx, String assignee, String xxx, ActivitiEventType eventType) {

SimpleMailMessage msg = new SimpleMailMessage();
String toEmailAddress = "xxx@xxx.com";

msg.setSubject("hello world");
msg.setTo(toEmailAddress);
msg.setText(userName + "," + xxx+ ",來自" + userName2 + "的審批");
msg.setFrom("[email protected]");

try {
mailSender.send(msg);
} catch (MailException e) {
e.printStackTrace();
}

}

當然我們可以使用郵件模板velocity來做