手机号校验：@ApiModelProperty(value = "联系人电话")@NotBlank(message = "手机号码不能为空", groups = {Insert.class})@NotNull(message = "手机号不能为空", groups = {Insert.class})@Length(min = 11, max = 11, message = "手机号只能为11位")

mybatis-plus 时间字段比较,默认lt/gt/ge时间比较时无效：解决：LambdaQueryWrapper<?> queryWrapper = Wrappers.<ConstantsRetention>query().lambda();String strEnd= DateFormatUtils.format(dto.getEndTime(),"yyyy-MM-

替换yum源（如果不是虚拟机不用替换）curl -o /etc/yum.repos.d/CentOS-Base.repo mirrors.163.com/.help/CentOS7-Base-163.repoyum clean allyum makecache一、在线安装mysql（网速不好会有点慢）下载安装包：yum localinstall https://repo....

String a = ",abcd,,efg,l";System.out.println(Splitter.on(",").trimResults().omitEmptyStrings().splitToList(a));// 依次 join 多个字符串，Joiner 是 Guava 提供的 APIJoiner joiner = Joiner.on(",").skipNulls();String

1、依赖：<!-- websocket依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-websocket</artifactId></dependency>2.加配置