gateWay（2）自定义谓词工厂

在配置文件中定义了Timbetween所以我们需要新建一个predicateFactory来进行自定义配置

新建一个TimeBetweenPredicateFactory（“TimeBetween”+“PredicateFactory”-》只有这样才能配解析）

package com.itmuch.gateway;

import org.springframework.cloud.gateway.handler.predicate.AbstractRoutePredicateFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;

import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;
@Component
public class TimeBetweenRoutePredicateFactory extends
 AbstractRoutePredicateFactory<TimeBetweenConfig> {

    public TimeBetweenRoutePredicateFactory() {
        super(TimeBetweenConfig.class);
    }

    @Override
    public Predicate<ServerWebExchange> apply(TimeBetweenConfig config) {
        LocalTime start = config.getStart();
        LocalTime end = config.getEnd();

        return exchange->{
            LocalTime now = LocalTime.now();
            return now.isAfter(start) && now.isBefore(end);
        };
    }

    @Override
    public List<String> shortcutFieldOrder() {
        return Arrays.asList("start","end");
    }

    public static void main(String[] args) {

        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT);
        System.out.println(dateTimeFormatter.format(LocalTime.now()));
    }
}

继承

AbstractRoutePredicateFactory<>

需要用到泛型，这里的泛型是需要定义一个配置类来给配置参数，下面是配置类，配置开始时间和结束时间

package com.itmuch.gateway;

import lombok.Data;

import java.time.LocalTime;

@Data
public class TimeBetweenConfig {
    private LocalTime start;
    private LocalTime end;
}

在TimeBetweenPredicateFactory中重写的

 @Override
    public List<String> shortcutFieldOrder() {
        return Arrays.asList("start","end");
    }

用来映射参数，asList("配置文件的第1个参数","配置文件的第2个参数","配置文件的第3个参数","配置文件的第4个参数"....)，接给配置类，配置类得到参数后里面的参数有值然后在重写的

 @Override
    public Predicate<ServerWebExchange> apply(TimeBetweenConfig config) {
        LocalTime start = config.getStart();
        LocalTime end = config.getEnd();

        return exchange->{
            LocalTime now = LocalTime.now();
            return now.isAfter(start) && now.isBefore(end);
        };
    }

中进行谓词配置，实现自定义谓词工厂

根据java8新特性，可以查看这里时间格式

public static void main(String[] args) {

  DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT);
  System.out.println(dateTimeFormatter.format(LocalTime.now()));
    }