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SpringCloud: gateway中创建自定义路由断言工厂


1.在pom.xml中增加相关依赖

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>cn.edu.tju</groupId>
<artifactId>spring-cloud-gateway-demo</artifactId>
<version>1.0.0</version>

<name>spring-cloud-gateway</name>
<url>http://maven.apache.org</url>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.RELEASE</version>
<relativePath />
</parent>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Finchley.SR2</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis-reactive</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>

<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.0</version>
</dependency>


<dependency>
<groupId>com.auth0</groupId>
<artifactId>java-jwt</artifactId>
<version>3.8.3</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.alibaba.csp/sentinel-spring-cloud-gateway-adapter -->
<dependency>
<groupId>com.alibaba.csp</groupId>
<artifactId>sentinel-spring-cloud-gateway-adapter</artifactId>
<version>1.8.2</version>
</dependency>


</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<!-- 跳过单元测试 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<skipTests>true</skipTests>
</configuration>
</plugin>
</plugins>
</build>
</project>

2.自定义路由断言工厂类:

package cn.edu.tju.factory;

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

import java.util.function.Predicate;

@Component
//该类必须以RoutePredicateFactory结尾,并定义一个内部静态类来作为泛型类型,该类用来接收参数
public class MyTestRoutePredicateFactory extends AbstractRoutePredicateFactory<MyTestRoutePredicateFactory.Config> {

public MyTestRoutePredicateFactory(){
super(Config.class);
}

@Override
public Predicate<ServerWebExchange> apply(Config config) {
System.out.println("in diy route predicate factory");
return exchange -> {
if(config.name.equals("amadeus")){
return true;
}
return false;
};

}

public static class Config{
String name;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
}

}

3.配置application.yml文件

server:
port: 9008
spring:
application:
name: spring-cloud-gateway-demo
cloud:
gateway:
discovery:
locator:
enabled: false
lowerCaseServiceId: true
routes:
- id: diy_route
uri: lb://demoservice/ #转发到名为demoservice的微服务
predicates:
- Path=/test/** #请求路径以/test开头
- name: MyTest #自定义路由断言工厂的名称
args:
name: amadeus #传入到自定义路由断言工厂的参数
eureka:
instance:
prefer-ip-address: true
client:
service-url:
defaultZone: http://139.198.xx.xx:8761/eureka/ #Eureka地址

4.定义启动类,并启动程序

package cn.edu.tju;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;


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

5.打开http://localhost:9008/test,运行结果如下:

SpringCloud: gateway中创建自定义路由断言工厂_spring


其中页面中输出的内容来自配置到Eureka注册中心的demoservice微服务


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