SpringBoot2.7 + Nacos + GateWay

1. pom包，主要是记录版本

   <?xml version="1.0" encoding="UTF-8"?>

   <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-parent</artifactId>
   <version>2.7.17</version>
   <relativePath/>
   </parent>
   <groupId>com.student.gateway</groupId>
   <artifactId>demo</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>demo</name>
   <description>Demo project for Spring Boot</description>
   <url/>
   <licenses>
   <license/>
   </licenses>
   <developers>
   <developer/>
   </developers>
   <scm>
   <connection/>
   <developerConnection/>
   <tag/>
   <url/>
   </scm>
   <properties>
   <java.version>8</java.version>
   </properties>
   <dependencies>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            <version>2021.0.5.0</version>
        </dependency>
   
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-gateway -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
            <version>3.1.9</version>
        </dependency>
   
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>2021.0.5.0</version>
        </dependency>
   
        <!--sentinel gateway-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
            <version>2021.0.5.0</version>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            <version>2021.0.5.0</version>
        </dependency>
   
        <!-- 202.0.5版本的cloud，需要这个注解才能负载均衡也就是 lb:student才生效 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
            <version>3.1.4</version>
        </dependency>
   
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
   
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

   </project>

2. Nacos搭建，我这边是2.x版本的

3. yaml配置

   server:
   port: 8004

   spring:
   application:
   name: gateway
   config:
   import: nacos:gateway.yaml // config的全名
   cloud:
   nacos:
   discovery:
   server-addr: 127.0.0.1:8848
   config:
   server-addr: 127.0.0.1:8848
   file-extension: yaml
   sentinel:
   transport:
   dashboard: 127.0.0.1:8005
   eager: true
   gateway:
   routes:
   - id: student
   uri: lb://student
   predicates:
   - Path=/api/redis/**
   filters:
   - StripPrefix=1 // 过滤前缀
   - Log=23 // 自定义过滤器

4. 自定义过滤器写法

package com.student.gateway.demo.filters.gateway;

import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
import java.util.Arrays;
import java.util.List;

@Component
public class LogGatewayFilterFactory extends AbstractGatewayFilterFactory<LogModal> {

    public LogGatewayFilterFactory() {
        super(LogModal.class);
    }

    @Override
    public List<String> shortcutFieldOrder() {
        return Arrays.asList("name1");
    }

    @Override
    public GatewayFilter apply(LogModal config) {
        return new GatewayFilter() {
            @Override
            public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
                System.out.println(config.getName1());
                Mono<Void> mono = chain.filter(exchange);
                return mono;
            }
        };
    }
}

package com.student.gateway.demo.filters.gateway;

public class LogModal {

    private String name1;

    public String getName1() {
        return name1;
    }

    public void setName1(String name1) {
        this.name1 = name1;
    }

}

5. 全局过滤器

package com.student.gateway.demo.filters.gateway;

import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
import java.util.Arrays;
import java.util.List;

@Component
public class LogGatewayFilterFactory extends AbstractGatewayFilterFactory<LogModal> {

    public LogGatewayFilterFactory() {
        super(LogModal.class);
    }

    @Override
    public List<String> shortcutFieldOrder() {
        return Arrays.asList("name1");
    }

    @Override
    public GatewayFilter apply(LogModal config) {
        return new GatewayFilter() {
            @Override
            public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
                System.out.println(config.getName1());
                Mono<Void> mono = chain.filter(exchange);
                return mono;
            }
        };
    }
}

6. sentinel的下载，限流和熔断