zuul网关熔断简单使用

在Edgware版本之前，zuul提供ZuulFallbackProvider实现熔断，在Edgware版本开始，zuul提供fallbackProvider实现熔断

zuul网关熔断只针对timeout异常处理(因为对于错误没法进行准确判断)

演示过程可以不启动商品服务测试或者只写eureka注册中心和zuul项目，不写商品服务项目

http://127.0.0.1:1002/api/product-service/product/getProduct/1992?token=6666

关键代码

package com.zuul.config;
 
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;
 
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
 
/**
 * @author yourheart
 * @Description
 * @create 2022-05-19 15:59
 */
@Component
public class ProductProviderFallback implements FallbackProvider {
    @Override
    public String getRoute() {
        return "product-service";
    }
 
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        ClientHttpResponse response = new ClientHttpResponse() {
 
            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders headers = new HttpHeaders();
                MediaType mediaType = new MediaType("application", "json", Charset.forName("utf-8"));
                headers.setContentType(mediaType);
                return headers;
            }
 
            @Override
            public InputStream getBody() throws IOException {
 
                ByteArrayInputStream inputStream = new ByteArrayInputStream("商品服务不可用".getBytes());
                return inputStream;
            }
 
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }
 
            @Override
            public int getRawStatusCode() throws IOException {
                return this.getStatusCode().value();
            }
 
            @Override
            public String getStatusText() throws IOException {
                return this.getStatusCode().getReasonPhrase();
            }
 
            @Override
            public void close() {
 
            }
        };
        return response;
    }
}

　　zuul项目pom

<?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">
    <parent>
        <artifactId>zuul-aprent</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
 
    <groupId>com.zuul</groupId>
    <artifactId>zuul-service</artifactId>
 
    <dependencies>
        <!--zuul依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>
        <!--lombok依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.16</version>
        </dependency>
        <!--客户端-->
        <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-actuator</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>
    </dependencies>
 
 
</project>

　　父类pom

<?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>org.example</groupId>
    <artifactId>zuul-aprent</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>eureka-service</module>
        <module>prodoct-service</module>
        <module>order-service</module>
        <module>zuul-service</module>
    </modules>
 
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
    </parent>
 
    <dependencyManagement>
 
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
 
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
 
 
 
        </dependencies>
    </dependencyManagement>
 
    <build>
        <plugins>
            <!--编译插件-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>utf-8</encoding>
                </configuration>
            </plugin>
            <!--打包插件-->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
 
 
</project>

　　配置文件

application.yml

server:
  port: 1002
spring:
  application:
    name: zuul-service
 
zuul:
  routes:
    product-service:
      path: /product-service/**
      serviceId: product-service
  prefix: /api
 
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
management:
  endpoints:
    web:
      exposure:
        include: '*'

package com.zuul;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
 
/**
 * @author yourheart
 * @Description
 * @create 2022-04-20 22:05
 */
@SpringBootApplication
//开启zuul注解
@EnableZuulProxy
@EnableDiscoveryClient
@EnableHystrixDashboard
@EnableCircuitBreaker
public class ZuulApplication {
    public static void main(String[] args) {
        SpringApplication.run(ZuulApplication.class,args);
    }
 
}