Activiti 开发案例之动态指派任务

ProcessInstance process = runtimeService.startProcessInstanceByKey("leave",businessKey, variables);
Task task = taskService.createTaskQuery().processInstanceId(process.getId()).active().singleResult();
//此时，应删除掉流程图中赋值的角色，否则会重复
taskService.addCandidateGroup(task.getId(),"部门经理");

Map<String,Object> variables=new HashMap<String,Object>();
variables.put("approve", "true");
Task task = taskService.createTaskQuery().processInstanceId(processInstanceId).active().singleResult();
//一定要认领任务之后，重新获取当前任务，然后分配角色。
taskService.claim(taskId, userId);
taskService.complete(taskId, variables);
task = taskService.createTaskQuery().processInstanceId(process.getId()).active().singleResult();
//此时，应删除掉流程图中赋值的角色，否则会重复
taskService.addCandidateGroup(task.getId(),"人事");

Map<String,Object> variables=new HashMap<String,Object>();
variables.put("approve", "false");
Task task = taskService.createTaskQuery().processInstanceId(processInstanceId).active().singleResult();
//一定要认领任务之后，重新获取当前任务，然后分配角色。
taskService.claim(taskId, userId);
taskService.complete(taskId, variables);
task = taskService.createTaskQuery().processInstanceId(process.getId()).active().singleResult();
//applyId为申请人ID
taskService.addCandidateUser(task.getId(),applyId);

TaskQuery taskQuery = taskService.createTaskQuery();
List<Task>  list = taskQuery.taskCandidateOrAssigned(userId)

-- 多个用户或者角色可以用 IN 
select  distinct RES.* from ACT_RU_TASK RES 

left join ACT_RU_IDENTITYLINK I on I.TASK_ID_ = RES.ID_ 

WHERE SUSPENSION_STATE_ = '1' 

AND ( RES.ASSIGNEE_ ='99' or (RES.ASSIGNEE_ is null 

AND ( I.USER_ID_  = '99' or I.GROUP_ID_  = '部门经理'  ))) 

/**
* 删除指派人重新指派
*/
taskService.deleteCandidateUser(taskId,"原用户ID");
taskService.addCandidateUser(taskId,"新用户ID");