List<UserMeetDO> meets = userMeetMapper.selectList(new LambdaQueryWrapper<UserMeetDO>()
.eq(UserMeetDO::getMeetId, userMeetVo.getMeetId())
.and(wrapper -> wrapper
.and(w -> w.le(UserMeetDO::getStartTime, userMeetVo.getStartTime()).gt(UserMeetDO::getEndTime, userMeetVo.getStartTime()))
.or(w -> w.lt(UserMeetDO::getStartTime, userMeetVo.getEndTime()).ge(UserMeetDO::getEndTime, userMeetVo.getEndTime()))
.or(w -> w.ge(UserMeetDO::getStartTime, userMeetVo.getStartTime()).le(UserMeetDO::getEndTime, userMeetVo.getEndTime()))
)
);
在xml中mybatis里认为0就是空字符串
if和foreach
<if test="deptIds != null">
and (
sl.dept_id in
<foreach collection="deptIds" open="(" close=")" separator="," item="id">
#{id}
foreach>
or sl.owner_id in
<foreach collection="deptIds" open="(" close=")" separator="," item="id">
#{id}
foreach>
)
if>
中规中矩
Page<Object> iPage = PageHelper.startPage(page, size);
return PageResult.of(iPage,list);
手动分页
public List<PlanReceiveBo> getPage(List<PlanReceiveBo> list, int pageNum, int pageSize) {
List<PlanReceiveBo> result = new ArrayList<>();
if (list == null || list.isEmpty()) {
return result;
}
int totalSize = list.size();
int totalPage = (totalSize + pageSize - 1) / pageSize;
if (pageNum < 1 || pageNum > totalPage) {
return result;
}
int startIndex = (pageNum - 1) * pageSize;
int endIndex = Math.min(startIndex + pageSize, totalSize);
for (int i = startIndex; i < endIndex; i++) {
result.add(list.get(i));
}
return result;
}
@Scheduled(cron = “0 0 2 * * ?”)
5位:* * * * * 分、时、天、月、周
6位:* * * * * * 秒、分、时、天、月、周
7位:* * * * * * * 秒、分、时、天、月、周、年
BigDecimal totalAmount = list.stream()
.map(e -> e.getPlanReceiveAmount())
.reduce(BigDecimal.ZERO, BigDecimal::add);
LocalDate->LocalDateTime
param.setApplyStartTime(listParam.getStartTime().atStartOfDay());
param.setApplyEndTime(listParam.getEndTime().atTime(23,59,59));
LocalDateTime->LocalDate
LocalDateTime dateTime = LocalDateTime.of(2023, 11, 17, 10, 30);
LocalDate date = dateTime.toLocalDate();
System.out.println(date); // 输出 2023-11-17
如果为空就不返回该字段
@JsonInclude(JsonInclude.Include.NON_EMPTY)
JSON的相互转换
String jsonString = "{\"name\":\"name\", \"age\":20}";
SomeObject someObject = JSON.parseObject(jsonString, SomeObject.class);
SomeObject someObject = new SomeObject("name", 20);
String jsonString = JSON.toJSONString(someObject, SerializerFeature.PrettyFormat);
JSONObject jsonObject = new JSONObject(jsonString);
JSONArray attributesArray = jsonObject.getJSONArray("attributes");
JSONObject attributes1 = attributesArray.getJSONObject(0);
String country = attributes1.getString("country");
netstat –ano | findstr <端口号>
taskkill /F /PID 39908