spring cloud 请求熔断 feign
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1 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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.example</groupId> <artifactId>Spring-Cloud-Feign</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>Spring-Cloud-Feign</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.5.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <spring-cloud.version>Finchley.SR1</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </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> <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 配置文件
spring.application.name=feign-consumer server.port=4001 eureka.client.serviceUrl.defaultZone=http://localhost:8080/eureka/
3 启动类
@EnableFeignClients
@EnableFeignClients @SpringCloudApplication public class SpringCloudFeignApplication { public static void main(String[] args) { SpringApplication.run(SpringCloudFeignApplication.class, args); } }
4 根据服务名称来指定服务提供方
//根据服务名称来指定服务提供方 @FeignClient(name="service-a",fallback=TestServiceAFallBack.class) public interface TestServiceA { // 通过注解指定访问方式,访问路径,访问参数 @RequestMapping(method = RequestMethod.GET, value = "/getm") String getMessage(@RequestParam("message") String message); }
5 回退类 当service-a getm不可访问是 会返回已经写好的信息
@Component public class TestServiceAFallBack implements TestServiceA{ @Override public String getMessage(String message) { // TODO Auto-generated method stub return "the server is error"; } }
6 编写测试类
@RestController public class TestController { @Autowired TestServiceA testServiceA; @GetMapping("/test") public String test(String message) { return testServiceA.getMessage(message); } }
7 测试
启动 eureka注册中心 service-a 和feign三个项目
访问 http://127.0.0.1:4001/test?message=123 返回 hello world:123
把服务service-a停掉 再次访问 http://127.0.0.1:4001/test?message=123
返回
the server is error
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