Spring Cloud Netflix 使用路由网关统一访问接口（二）
Zuul 简介
Zuul 的主要功能是路由转发和过滤器。路由功能是微服务的一部分，比如 /api/user 转发到到 User 服务，/api/shop 转发到到 Shop 服务。Zuul 默认和 Ribbon 结合实现了负载均衡的功能。
创建路由网关
完整pom文件
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| <?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>2.2.2.RELEASE</version>
<relativePath/>
</parent>
<groupId>com.xzt</groupId>
<artifactId>spring-cloud-zuul</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-cloud-zuul</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.RELEASE</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-netflix-zuul</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>
|
application.yml配置文件
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| spring:
application:
name: spring-cloud-zuul
server:
port: 8769
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
zuul:
routes:
api-1:
path: /admin/**
serviceId: cloud-admin-service
|
路由说明：
- 以
/cloud-admin-client/ 开头的请求都转发给 cloud-admin-client 服务
Application启动类
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| package com.xzt.zuul;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
@SpringBootApplication
@EnableEurekaClient
@EnableZuulProxy
public class SpringCloudZuulApplication {
public static void main(String[] args) {
SpringApplication.run(SpringCloudZuulApplication.class, args);
}
}
|
启动工程，打开浏览器访问：http://127.0.0.1:8769/cloud-admin-client/hi?message=HelloSpring浏览器显示:
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| Hi，your message is : HelloSpring i am from port : 8762
|
配置网关路由失败时的回调
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| package com.xzt.zuul;
import com.fasterxml.jackson.databind.ObjectMapper;
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.util.HashMap;
import java.util.Map;
@Component
public class WebAdminFeignFallbackProvider implements FallbackProvider {
@Override
public String getRoute() {
return null;
}
@Override
public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
return new ClientHttpResponse() {
@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();
headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
return headers;
}
};
}
}
|
如果访问http://127.0.0.1:8769/cloud-admin-client/hi?message=HelloSpring失败，则显示：
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| {"message":"无法连接，请检查您的网络","status":200}
|
