文件
特性
- Java 8
- Spring Framework 5
- Spring Boot 2
- 動態路由
- 內建到Spring Handler對映中的路由匹配
- 基於HTTP請求的路由匹配 (Path, Method, Header, Host, etc…)
- 過濾器作用於匹配的路由
- 支援Spring Cloud DiscoveryClient配置路由,與服務發現與註冊配合使用
應用
本文springcloud基於Finchley.RELEASE版本
- pom.xml引入gateway依賴
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
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- 新建自定義filter,繼承AbstractGatewayFilterFactory
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import reactor.core.publisher.Mono;
import java.util.Arrays;
import java.util.List;
/**
* 過濾器
* @author 愛飄de小子
*/
@Slf4j
@Component
public class CustomGatewayFilterFactory extends AbstractGatewayFilterFactory<CustomGatewayFilterFactory.Config> {
public CustomGatewayFilterFactory() {
super(Config.class);
log.info("載入 自定義攔截器 [Custom]...");
}
@Override
public Config newConfig() {
return new Config();
}
@Override
public List<String> shortcutFieldOrder() {
return Arrays.asList("enabled");
}
/**
* @param config
* @return
*/
@Override
public GatewayFilter apply(CustomGatewayFilterFactory.Config config) {
return (exchange, chain) -> {
//Custom=false 跳過驗證
if (!config.isEnabled()) {
return chain.filter(exchange);
}
//獲取請求資訊
ServerHttpRequest request = exchange.getRequest();
HttpHeaders headers = request.getHeaders();
//獲取請求引數
//具體業務略....
String token = headers.getFirst("token");
System.out.println("====token===="+token);
return chain.filter(exchange);
};
}
public static class Config {
/**
* 控制是否開啟攔截器
*/
private boolean enabled;
public Config() {}
public boolean isEnabled() {
return enabled;
}
public void setEnabled(boolean enabled) {
this.enabled = enabled;
}
}
}
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- bootstrap.yml配置gateway
spring:
application:
name: gateway-demo
cloud:
gateway:
discovery:
locator:
enabled: true #是否開啟
lower-case-service-id: true
default-filters: #全域性過濾器配置
routes:
- id: web
uri: lb://epw-web
predicates:
- Path=/web/**
filters:
- StripPrefix=1
# 配置自定義CustomGatewayFilterFactory ,Custom是CustomGatewayFilterFactory的字首,gateway預設省略GatewayFilterFactory
- Custom=true
- id: common
uri: lb://epw-common
predicates:
- Path=/common/**
filters:
- StripPrefix=1
eureka:
instance:
prefer-ip-address: true
lease-renewal-interval-in-seconds: 10 #表示eureka client傳送心跳給server端的頻率,預設為30秒
health-check-url-path: /actuator/health #健康檢查的地址(依賴spring-boot-starter-actuator)
client:
registry-fetch-interval-seconds: 10 #表示eureka client間隔多久去拉取服務註冊資訊,預設為30秒
service-url:
defaultZone: http://localhost:8761/eureka/
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說明:
- default-filters: 裡面可以定義一些共同的filter,對所有路由都起作用
- routes:具體的路由資訊,是一個陣列,每一個路由基本包含部分:
- id:這個路由的唯一id,不定義的話為一個uuid
- uri:http請求為lb://字首 + 服務id;ws請求為lb:ws://字首 + 服務id;表示將請求負載到哪一個服務上
- predicates:表示這個路由的請求匹配規則,只有符合這個規則的請求才會走這個路由。為一個陣列,每個規則為並且的關係。
- filters:請求轉發前的filter,為一個陣列。
- order:這個路由的執行order
4.專案啟動啟動類
import org.springframework.boot.SpringApplication;
import org.springframework.cloud.client.SpringCloudApplication;
/**
* @author 愛飄de小子
*/
@SpringCloudApplication
public class GatewayApplication {
public static void main(String[] args) {
SpringApplication.run(GatewayApplication.class, args);
}
}
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說明: @SpringCloudApplication是一個組合註解,包含@SpringBootApplication @EnableDiscoveryClient