import org.activiti.engine.impl.form.DefaultTaskFormHandler; //导入依赖的package包/类
private String getFormKey(PvmActivity act)
{
    if(act instanceof ActivityImpl) 
    {
        ActivityImpl actImpl = (ActivityImpl) act;
        if (actImpl.getActivityBehavior() instanceof UserTaskActivityBehavior)        
        {
            UserTaskActivityBehavior uta = (UserTaskActivityBehavior) actImpl.getActivityBehavior();
            TaskFormHandler handler = uta.getTaskDefinition().getTaskFormHandler();
            if(handler != null && handler instanceof DefaultTaskFormHandler)
            {
                // We cast to DefaultTaskFormHandler since we do not configure our own
                return ((DefaultTaskFormHandler)handler).getFormKey().getExpressionText();
            }
            
        }
    }
    return null;
}
 

import org.activiti.engine.impl.form.DefaultTaskFormHandler; //导入依赖的package包/类
private String getFormKey(TaskDefinition taskDefinition) 
{
	 TaskFormHandler handler = taskDefinition.getTaskFormHandler();
     if(handler != null && handler instanceof DefaultTaskFormHandler)
     {
         // We cast to DefaultTaskFormHandler since we do not configure our own
         return ((DefaultTaskFormHandler)handler).getFormKey().getExpressionText();
     }
     return null;
}
 

import org.activiti.engine.impl.form.DefaultTaskFormHandler; //导入依赖的package包/类
public TaskDefinition parseTaskDefinition(BpmnParse bpmnParse, UserTask userTask, String taskDefinitionKey, ProcessDefinitionEntity processDefinition) {
  TaskFormHandler taskFormHandler = new DefaultTaskFormHandler();
  taskFormHandler.parseConfiguration(userTask.getFormProperties(), userTask.getFormKey(), bpmnParse.getDeployment(), processDefinition);

  TaskDefinition taskDefinition = new TaskDefinition(taskFormHandler);

  taskDefinition.setKey(taskDefinitionKey);
  processDefinition.getTaskDefinitions().put(taskDefinitionKey, taskDefinition);
  ExpressionManager expressionManager = bpmnParse.getExpressionManager();

  if (StringUtils.isNotEmpty(userTask.getName())) {
    taskDefinition.setNameExpression(expressionManager.createExpression(userTask.getName()));
  }

  if (StringUtils.isNotEmpty(userTask.getDocumentation())) {
    taskDefinition.setDescriptionExpression(expressionManager.createExpression(userTask.getDocumentation()));
  }

  if (StringUtils.isNotEmpty(userTask.getAssignee())) {
    taskDefinition.setAssigneeExpression(expressionManager.createExpression(userTask.getAssignee()));
  }
  if (StringUtils.isNotEmpty(userTask.getOwner())) {
    taskDefinition.setOwnerExpression(expressionManager.createExpression(userTask.getOwner()));
  }
  for (String candidateUser : userTask.getCandidateUsers()) {
    taskDefinition.addCandidateUserIdExpression(expressionManager.createExpression(candidateUser));
  }
  for (String candidateGroup : userTask.getCandidateGroups()) {
    taskDefinition.addCandidateGroupIdExpression(expressionManager.createExpression(candidateGroup));
  }
  
  // Activiti custom extension
  
  // Task listeners
  for (ActivitiListener taskListener : userTask.getTaskListeners()) {
    taskDefinition.addTaskListener(taskListener.getEvent(), createTaskListener(bpmnParse, taskListener, userTask.getId()));
  }

  // Due date
  if (StringUtils.isNotEmpty(userTask.getDueDate())) {
    taskDefinition.setDueDateExpression(expressionManager.createExpression(userTask.getDueDate()));
  }
  
  // Priority
  if (StringUtils.isNotEmpty(userTask.getPriority())) {
    taskDefinition.setPriorityExpression(expressionManager.createExpression(userTask.getPriority()));
  }

  return taskDefinition;
}