SpringCloud+Gateway+Nacos+Sentinel

1、实现Gateway路由动态加载
2、在Gateway动态修改RequestBody内容，实现网关加解密
3、实现Sentinel流控规则落地到Nacos，并动态加载：sentinel-dashboard -> Nacos 以及 Nacos -> sentinel-dashboard

顶级模块 pom.xml

<?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>2.3.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xxx</groupId>
    <artifactId>xxx-gateway-parent</artifactId>
    <packaging>pom</packaging>
    <version>1.0.0-SNAPSHOT</version>
    <description>Spring Boot Gateway</description>

    <modules>
        <module>xxx-gateway</module>
        <module>user-service</module>
        <module>order-service</module>
    </modules>

    <properties>
        <java.version>1.8</java.version>
        <spring-boot.version>2.3.2.RELEASE</spring-boot.version>
        <spring-cloud.version>Hoxton.SR9</spring-cloud.version>
        <spring-cloud-alibaba.version>2.2.6.RELEASE</spring-cloud-alibaba.version>
        <!-- Alibaba 的JSON处理库 -->
        <alibaba.fastjson.version>1.2.83</alibaba.fastjson.version>
        <alibaba.fastjson-yaml.version>2.6.2</alibaba.fastjson-yaml.version>
        <log4j.version>1.2.17</log4j.version>
    </properties>

    <dependencies>
        <!-- Alibaba 的JSON处理库 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <!-- 声明springBoot版本 -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- 声明springCloud版本 -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- 声明 springCloud Alibaba 版本 -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- Alibaba 的JSON处理库 -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>${alibaba.fastjson.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <configuration>
                    <skipTests>true</skipTests>    <!--默认关掉单元测试 -->
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <configuration><encoding>UTF-8</encoding>
                    <!-- 过滤后缀为pem、pfx的证书文件 -->
                    <nonFilteredFileExtensions>
                        <nonFilteredFileExtension>cer</nonFilteredFileExtension>
                        <nonFilteredFileExtension>pem</nonFilteredFileExtension>
                        <nonFilteredFileExtension>pfx</nonFilteredFileExtension>
                    </nonFilteredFileExtensions>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

网关模块 pom.xml

<?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>
    <groupId>com.xxx</groupId>
    <artifactId>xxx-gateway</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <description>SpringCloud Alibaba Gateway</description>
    <parent>
        <groupId>com.xxx</groupId>
        <artifactId>xxx-gateway-parent</artifactId>
        <version>1.0.0-SNAPSHOT</version>
    </parent>
    <properties>
        <java.version>8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>

        <!-- 使用阿里云的nacos作为注册中心和配置中心 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <!-- 阿里巴巴 Nacos 配置中心-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

        <!-- 引入sentinel进行服务降级熔断 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        <!-- gateway网关整合sentinel进行限流降级 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
        </dependency>
        <!-- 使用Nacos保存流控规则 -->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>

        <!-- 引入 Redis spring-boot-starter-cache 依赖 与 Pool2 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

网关模块 bootstrap.yml

server:
  port: 9090

spring:
  application:
    name: gateway-service
  cloud:
    nacos:
      username: nacos
      password: nacos
      discovery:
        server-addr: 127.0.0.1:8848
      config:
        server-addr: 127.0.0.1:8848
        file-extension: yml
     # 路由配置放到 Nacos 上管理
#    gateway:
#      discovery:
#        locator:
#          # gateway 可以从 nacos 发现微服务
#          enabled: true
#      globalcors:
#        cors-configurations:
#          '[/**]':
#            allowedOrigins: "*"
#            allowedMethods: "*"
#            allowedHeaders: "*"
#      filter:
#        modify-request-body:
#          enabled: true
#      routes:
#        - id: order-api-9002
#          uri: lb://order-service
#          predicates:
#            - Path=/order-api/**
#          filters:
#            - RewritePath=/order-api(?<segment>/?.*), $\{segment}
    sentinel:
      # 服务启动就建立心跳连接
      eager: true
      transport:
        # 控制台地址
        dashboard: localhost:8080
      scg:
        fallback:
          mode: response
          response-status: 426
          response-body: '{"code": 426, "message": "限流了，稍后重试！"}'
      datasource:
        ### nacos连接地址
        nacos:
          server-addr: 127.0.0.1:8848
        # 自定义命名
        ds1:
          # 支持多种持久化数据源：file、nacos、zk、apollo、redis、consul
          nacos:
            ## nacos连接的分组
            group-id: ${sentinel.nacos.gw-flow.group-id}
            # 规则类型：flow、degrade、param-flow、system、authority、gw-flow、gw-api-group
            rule-type: gw-flow
            ### 读取配置文件的 data-id
            data-id: ${sentinel.nacos.gw-flow.data-id}
            ###  读取配置文件类型为json
            data-type: ${sentinel.nacos.gw-flow.data-type}

sentinel:
  nacos:
    gw-flow:
      group-id: DEFAULT_GROUP
      data-id: gateway-sentinel-flowrule.json
      data-type: json

gateway-service.yml

spring:
  cloud:
    gateway:
      discovery:
        locator:
          # gateway 可以从 nacos 发现微服务
          enabled: false
      globalcors:
        cors-configurations:
          '[/**]':
            allowedOrigins: "*"
            allowedMethods: "*"
            allowedHeaders: "*"
      filter:
        modify-request-body:
          enabled: true
      routes:
        - id: order-api-9002
          uri: lb://order-service
          predicates:
            - Path=/order-api/**
          filters:
            - RewritePath=/order-api(?<segment>/?.*), $\{segment}
        - id: order-api2-9002
          uri: lb://order-service
          predicates:
            - Path=/order-api2/**
          filters:
            - RewritePath=/order-api2(?<segment>/?.*), $\{segment}      

动态修改 RequestBody 以及 动态刷新 路由配置

在启动类：GatewayApplication.java 添加 RouteLocator bean 注入

package com.xxx.gateway;

import com.alibaba.fastjson.JSONObject;
import com.xxx.gateway.filter.ModifyRequestBodyRewriteFunction;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
import org.springframework.context.annotation.Bean;

@RefreshScope
@EnableDiscoveryClient
@SpringBootApplication
public class GatewayApplication {

    public static void main(String[] args) {
        SpringApplication.run(GatewayApplication.class, args);
    }

    @Bean
    public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
        return builder.routes()
                .route("user_api_rout", r -> r.path("/user-api/**")
                        .filters(f -> f.stripPrefix(1)
                                .modifyRequestBody(config ->
                                        config.setInClass(JSONObject.class)
                                        .setOutClass(JSONObject.class)
                                        .setRewriteFunction(new ModifyRequestBodyRewriteFunction())
                                ))
                        .uri("lb://user-service")
                )
                .build();
    }


}

修改请求体：ModifyRequestBodyRewriteFunction.java

package com.xxx.gateway.filter;

import com.alibaba.fastjson.JSONObject;
import org.reactivestreams.Publisher;
import org.springframework.cloud.gateway.filter.factory.rewrite.RewriteFunction;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 修改请求体
 * @date 2023/8/27 13:18
 */
@Component
public class ModifyRequestBodyRewriteFunction implements RewriteFunction<JSONObject, JSONObject> {

    @Override
    public Publisher<JSONObject> apply(ServerWebExchange serverWebExchange, JSONObject o) {
        if (o == null) {
            return Mono.empty();
        }
        o.put("name", "我是不请自来");
        return Mono.just(o);
    }

}