java

java8

将支付方式一样的结果进行合并

public List<Map<String, Object>> mergePayData(List<Map<String, Object>> list) {
 List<Map<String, Object>> result = list.stream().collect(
         Collectors.groupingBy(item -> item.get("paytype"))).values().stream().map(e -> {
     Map<String, Object> map = e.get(0);
     map.put("paynum", e.stream().map(s -> new BigInteger(String.valueOf(s.get("paynum")))).reduce(BigInteger.ZERO, BigInteger::add));
     map.put("payfee", e.stream().map(s -> new BigDecimal(String.valueOf(s.get("payfee")))).reduce(BigDecimal.ZERO, BigDecimal::add));
     return map;
 }).collect(Collectors.toList());
 return result;
}

将停车场一样的结果进行合并

public List<Map<String, Object>> mergePayDataByParkId(List<Map<String, Object>> list) {
 List<Map<String, Object>> result = list.stream().collect(
         Collectors.groupingBy(item -> item.get("parkname"))).values().stream().map(e -> {
     Map<String, Object> map = e.get(0);
     map.put("payfee", e.stream().map(s -> new BigDecimal(String.valueOf(s.get("payfee")))).reduce(BigDecimal.ZERO, BigDecimal::add));
     return map;
 }).collect(Collectors.toList());
 return result;
}

将支付方式一样的结果进行合并

public List<PayOverViewBO> mergePayData(List<PayOverViewBO> list) {
 List<PayOverViewBO> result = list.stream()
         .collect(Collectors.toMap(PayOverViewBO::getPaytype, a -> a, (o1, o2) -> {
             o1.setAmount(o1.getAmount().add(o2.getAmount()));
             o1.setCount(o1.getCount() + o2.getCount());
             return o1;
         })).values().stream().collect(Collectors.toList());
 return result;
}

对List<Map<String, Object>>进行排序

List<Map<String, Object>> allPayParkId = new ArrayList<>();
     allPayParkId.addAll(paySortedByParkId);
     allPayParkId.addAll(monthFeeByParkId);

     //按金额进行排序
     allPayParkId = allPayParkId.stream().sorted(Comparator.comparing(Test::comparingByPayFee).reversed()).collect(Collectors.toList());

/**
 * 排序内部类
 */
private static class Test {
    private static BigDecimal comparingByPayFee(Map<String, Object> map) {
        return (BigDecimal) map.get("payfee");
    }

    private static BigDecimal comparingByAmount(Map<String, Object> map) {
        return (BigDecimal) map.get("amount");
    }
}

对List<实体类>进行去重

• 第一种，实体类字段值全一样

  List<CardInfo> cardInfos = cardinfoService.selectCarList(beginTime);
  cardInfos = cardInfos.stream().distinct().collect(Collectors.toList());

• 第二种，实体类字段值不一样，按照某一个字段去重

  List<CardInfo> cardInfos = cardinfoService.selectCarList(beginTime);
  //去除车牌号重复数据
  cardInfos =cardInfos.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(CardInfo::getCarNo))), ArrayList::new));

Springboot项目使用logstash

1. pom.xml增加依赖

   <!--logstash日志收集-->
   <dependency>
       <groupId>net.logstash.logback</groupId>
       <artifactId>logstash-logback-encoder</artifactId>
       <version>5.3</version>
   </dependency>

2. 日志文件logback.xml增加

   <!-- 输出到logstash -->
   <appender name="logstash" class="net.logstash.logback.appender.LogstashTcpSocketAppender">
       <destination>139.155.33.58:9600</destination>
       <!-- 日志输出编码 -->
       <encoder charset="UTF-8" class="net.logstash.logback.encoder.LogstashEncoder">
           <customFields>{"appname":"parking-app-server"}</customFields>
       </encoder>
   </appender>
                        
    <root level="ERROR">
           <appender-ref ref="logstash"/>
       </root>

Springboot方法调用链路追踪和运行时长统计工具koTime

引入依赖

<dependency>
    <groupId>cn.langpy</groupId>
    <artifactId>ko-time</artifactId>
    <version>2.0.4</version>
  </dependency>

配置

在application.properties文件中进行配置

• 必填配置

ko-time.pointcut=execution(public * com.huoyo..*.*(..)) # 需要监测的切面范围，参考aop的@pointcut 或者左侧常见问题

访问

• 启动项目访问 /koTime 路径即可
• 如果仅仅只是想统计某个方法，在方法上加上@ComputeTime即可，控制台会输出耗时

Spring框架

• Spring原理

https://oipunk.github.io/2020/08/24/Spring%E5%8E%9F%E7%90%86%E8%AE%B2%E8%A7%A3/

• Spring设计模式

• spring用到的设计模式

https://mp.weixin.qq.com/s/j1zO9OPw8h3QxHEH2n9K6Q

• 实战设计模式，告别流水线式写代码

https://mp.weixin.qq.com/s/2jWM4O_1pS7r9P5-1U6cjw

curl发送post请求

curl -H “Content-Type: application/json” -X POST -d ‘{“jobNumber”: “010234012” }’ “http://127.0.0.1:8002/visitor/getJianDaStaff"

mybatis-plus 团队新作 mybatis-mate 轻松搞定数据权限

https://juejin.cn/post/7002876425187360781