list 转map（1对1）

 

list 转 map（value是list）

List<CityRideDraftDto> channelCityRideDraftDtoList = channelCityRideDraftDtoListMap.computeIfAbsent(cityRideDraftDto.getChannel(), k -> new ArrayList<>());

 

List.new一个：

package com.google.common.collect.Lists;

List<String> keyList = Lists.newArrayList(partnerServerInfo.getAndroidDriverKey(),
                                          partnerServerInfo.getAndroidPassengerKey(),
                                          partnerServerInfo.getIosDriverKey(),
                                          partnerServerInfo.getIosPassengerKey());

 当前时间：

import org.joda.time.LocalDateTime;

LocalDateTime.now().toDate();

 

善用Optional:

JSONObject extJson = Optional.ofNullable(JSONObject.parseObject(approvalLog.getExt())).orElse(new JSONObject());

 

重试注解：

@Retryable(value = {HttpRequestApiException.class}, maxAttempts = 3,

           backoff = @Backoff(delay = 1000L, multiplier = 1.5))

 

判空：

字符串：org.apache.commons.lang3.StringUtils isBlank()
对象：if (Objects.nonNull(merchantBusinessType)) {}

集合：import org.apache.commons.collections.CollectionUtils;

CollectionUtils.isNotEmpty(list) 

不符合要求抛异常：

Assert.notNull(processInstanceOpenApi, "processInstanceOpenApi is empty");