Spring Cloud Gateway-简单路由或回退不起作用

Question

我是Spring云网关实现的新手。仅仅通过尝试一个简单的教程，代码似乎不起作用。请参阅我所做的以下步骤和代码。

1. 使用spring初始值设定项创建网关项目

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>2.3.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.SR7</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</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-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-netflix-hystrix-dashboard</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

2. 添加了简单路线->ServerCodecConfigurer出现错误
3. 解决了错误，运行了项目

Application.java

package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.http.codec.ServerCodecConfigurer;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}

@Bean
public ServerCodecConfigurer serverCodecConfigurer() {
return ServerCodecConfigurer.create();
}

@Bean
public RouteLocator myRoutes(RouteLocatorBuilder builder) {
return builder.routes()
.route(p -> p
.path("/get")
.filters(f -> f.addRequestHeader("Hello", "Value"))
.uri("http://httpbin.org:80"))
.build();
}
}

4. 运行命令：$curl --dump-header - http://localhost:9000/get

响应

HTTP/1.1 404
Vary: Origin
Vary: Access-Control-Request-Method
Vary: Access-Control-Request-Headers
Content-Type: application/json
Transfer-Encoding: chunked
Date: Tue, 18 Aug 2020 21:16:39 GMT
{"timestamp":"2020-08-18T21:16:39.260+00:00","status":404,"error":"Not Found","message":"","path":"/get"}

预期响应

HTTP/1.1 200 OK
Date: Wed, 19 Aug 2020 08:21:29 GMT
Content-Type: application/json
Content-Length: 254
Connection: keep-alive
Server: gunicorn/19.9.0
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
{
"args": {},
"headers": {
"Accept": "*/*",
"Host": "httpbin.org",
"User-Agent": "curl/7.55.1",
"X-Amzn-Trace-Id": "Root=1-5f3ce109-63eb231a030488be4168fc7e"
},
"origin": "0.0.0.0",
"url": "http://httpbin.org/get"
}

使用Greenwich.SR2云版本和其他项目，这条路线似乎可行，但Hystrix仍然不起作用。使用以下示例项目：https://github.com/spring-guides/gs-gateway

任何关于使用Hystrix和Eureka实现云网关的帮助都将是有用的。我尝试了很多组合，但似乎仍然不起作用。

Answer 1

从start.spring.io和您的mRoutes()bean构建一个简单的网关，我得到了预期的响应。hystrix-dashboard需要servlet，当我添加它时，我会遇到您的ServerCodecConfigurer问题。

如果你检查日志，你会看到：

2020-08-19 16:36:58.943  WARN 157108 --- [           main] GatewayClassPathWarningAutoConfiguration : 
**********************************************************
Spring MVC found on classpath, which is incompatible with Spring Cloud Gateway at this time. Please remove spring-boot-starter-web dependency.
**********************************************************

删除spring-cloud-starter-netflix-hystrix-dashboard依赖项，因为它不兼容。