(8)springcloud使用路由网关统一访问接口zuul

以你之姓@ 2023-05-29 05:19 8阅读 0赞

建hello-spring-cloud-zuul

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <parent>
            <groupId>com.itheima</groupId>
            <artifactId>hello-spring-cloud-dependencies</artifactId>
            <version>1.0.0-SNAPSHOT</version>
            <relativePath>../hello-spring-cloud-dependencies/pom.xml</relativePath>
        </parent>
    
        <artifactId>hello-spring-cloud-zuul</artifactId>
        <packaging>jar</packaging>
    
        <name>hello-spring-cloud-zuul</name>
        <url>http://www.ggbond.xyz</url>
        <inceptionYear>2019</inceptionYear>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-tomcat</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-eureka-server</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
            </dependency>
            
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <mainClass>com.itheima.hello.spring.cloud.zuul.ZuulApplication</mainClass>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

2.application

@SpringBootApplication
    @EnableEurekaClient
    @EnableZuulProxy
    public class ZuulApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(ZuulApplication.class, args);
        }
    }

3.application.yml

spring:
      application:
        name: hello-spring-cloud-zuul
    
    server:
      port: 8769
    
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
    
    zuul:
      routes:
        api-a:
          path: /api/a/**
          serviceId: hello-spring-cloud-web-admin-ribbon
    
        api-b:
          path: /api/b/**
          serviceId: hello-spring-cloud-web-admin-feign

4.浏览器

[http://localhost:8769/api/a/hi?message=hello  访问ribbon][http_localhost_8769_api_a_hi_message_hello_ _ribbon]

[http://localhost:8769/api/b/hi?message=hello  访问feign][http_localhost_8769_api_a_hi_message_hello_ _ribbon]

以上访问会出现路由失败的问题，

5.配置路由网关失败的回调

@Component
    public class WebAdminFeignFallbackProvider implements FallbackProvider {
    
        @Override
        public String getRoute() {
            return "hello-spring-cloud-web-admin-feign";
        }
    
        @Override
        public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
            return new ClientHttpResponse() {
    
                /**
                 * 网关向 api 服务请求失败了，但是消费者客户端向网关发起的请求是成功的，
                 * 不应该把 api 的404, 500 等问题抛给客户端
                 * 网关和 api 服务集群对于客户端来说是黑盒
                 * @return
                 * @throws IOException
                 */
                @Override
                public HttpStatus getStatusCode() throws IOException {
                    return HttpStatus.OK;
                }
    
                @Override
                public int getRawStatusCode() throws IOException {
                    return HttpStatus.OK.value();
                }
    
                @Override
                public String getStatusText() throws IOException {
                    return HttpStatus.OK.getReasonPhrase();
                }
    
                @Override
                public void close() {
    
                }
    
                @Override
                public InputStream getBody() throws IOException {
                    ObjectMapper objectMapper = new ObjectMapper();
                    Map<String, Object> map = new HashMap<>();
                    map.put("status", 200);
                    map.put("message", "无法连接，请检查您的网络");
                    return new ByteArrayInputStream(objectMapper.writeValueAsString(map).getBytes("UTF-8"));
                }
    
                @Override
                public HttpHeaders getHeaders() {
                    HttpHeaders headers = new HttpHeaders();
                    // 和 getBody 中的内容一致
                    headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
                    return headers;
                }
            };
        }
    }

[http_localhost_8769_api_a_hi_message_hello_ _ribbon]: http://localhost:8769/api/a/hi?message=hello