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); } }