Java8 常用方法

1. 提取类的List的某个字段作为字符串List

   List<String> idList = taskList.stream().map(Task::getTaskId).collect(Collectors.toList());

2. CompletableFuture无返回值的异步请求

   public Map<String, Object> getWorkflowInfo(String taskId, String employeeCode, Long docId) {
       Map<String, Object> workflowInfo = new HashMap<>(2);
       CompletableFuture<Void> taskDetailInfo = CompletableFuture
               .runAsync(() -> weChatWorkflowService.getTaskDetail(workflowInfo, taskId, employeeCode));
       CompletableFuture<Void> borrowInfo = CompletableFuture
               .runAsync(() -> this.getBorrowInfo(workflowInfo, docId));
   
       try {
           borrowInfo.get();
           taskDetailInfo.get();
       } catch (Exception e) {
           e.printStackTrace();
       }
   
       return workflowInfo;
   }