编码风格

一、List相关操作

1、list 转map（1对1）

list 转 map（value是list）

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

list与字符串：

List uidList = Arrays.asList(uids.split(","));

guava的
String str = Joiner.on(",").join(list); 
apache的
String str = StringUtils.join(list.toArray(), ","); 

List.new一个：

package com.google.common.collect.Lists;

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

Arrays.asList(
        CardDataTypeEnum.INSURANCE_CARD
)

private final Map optionMaps = Maps.newHashMap();

当前时间：

import org.joda.time.LocalDateTime;

　LocalDateTime.now().toDate();

时间格式：

package org.apache.commons.lang.time;

   FastDateFormat.getInstance("yyyy-MM-dd HH:mm:ss.SSS").format(System.currentTimeMillis());

时间格式：

private static DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS").withZone(ZoneId.of("Asia/Shanghai"));

dateTimeFormatter.format(Instant.ofEpochMilli(System.currentTimeMillis())) 

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)) {}

Objects.equals(partnerOrderInfo.getName(),leopardConfigInfo.getName())

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");

遍历JsonArray

poiList.stream().forEach(poiJson -> {
    poiIdList.add(((JSONObject) poiJson).getString("poi_id"));
});