Spring Cloud之Zuul网关路由

前端请求先通过nginx走到zuul网关服务，zuul负责路由转发、请求过滤等网关接入层的功能，默认和ribbon整合实现了负载均衡

比如说你有20个服务，暴露出去，你的调用方，如果要跟20个服务打交道，是不是很麻烦

所以比较好的一个方式，就是开发一个通用的zuul路由转发的服务，根据请求api模式，动态将请求路由转发到对应的服务

前端，主要考虑跟一个服务打交道就可以了

1、创建zuul-server工程

2、pom.xml

<parent>

	<groupId>org.springframework.boot</groupId>

	<artifactId>spring-boot-starter-parent</artifactId>

	<version>1.5.2.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>

</properties>

<dependencies>

	<dependency>

		<groupId>org.springframework.cloud</groupId>

		<artifactId>spring-cloud-starter-eureka</artifactId>

	</dependency>

	<dependency>

		<groupId>org.springframework.cloud</groupId>

		<artifactId>spring-cloud-starter-zuul</artifactId>

	</dependency>

	<dependency>

		<groupId>org.springframework.boot</groupId>

		<artifactId>spring-boot-starter-web</artifactId>

	</dependency>

	<dependency>

		<groupId>org.springframework.boot</groupId>

		<artifactId>spring-boot-starter-test</artifactId>

		<scope>test</scope>

	</dependency>

</dependencies>

<dependencyManagement>

	<dependencies>

		<dependency>

			<groupId>org.springframework.cloud</groupId>

			<artifactId>spring-cloud-dependencies</artifactId>

			<version>Dalston.RC1</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>

<repositories>

	<repository>

		<id>spring-milestones</id>

		<name>Spring Milestones</name>

		<url>https://repo.spring.io/milestone</url>

		<snapshots>

			<enabled>false</enabled>

		</snapshots>

	</repository>

</repositories>

3、Application

@EnableZuulProxy

@EnableEurekaClient

@SpringBootApplication

public class ServiceZuulApplication {

    public static void main(String[] args) {

        SpringApplication.run(ServiceZuulApplication.class, args);

    }

}

4、application.yml

eureka:

  client:

    serviceUrl:

      defaultZone: http://localhost:8761/eureka/

server:

  port: 8766

spring:

  application:

    name: zuul-server

zuul:

  routes:

    say-hello:

      path: /say/hello/**

      serviceId: say-hello-service

    greeting:

      path: /greeting/**

      serviceId: greeting-service

5、修改代码

在greeting-service中的返回值加入自己的标识

6、运行，依次走两种不同的api接口，zuul会路由到不同的服务上去

7、请求过滤

@Component

public class UserLoginFilter extends ZuulFilter {

    private static Logger logger = LoggerFactory.getLogger(UserLoginFilter.class);

	// pre，routing，post，error

    @Override

    public String filterType() {

        return "pre";

    }

	// 顺序

    @Override

    public int filterOrder() {

        return 0;

    }

	// 根据逻辑判断是否要过滤

    @Override

    public boolean shouldFilter() {

        return true;

    }

    @Override

    public Object run() {

        RequestContext ctx = RequestContext.getCurrentContext();

        HttpServletRequest request = ctx.getRequest();

        log.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));

        Object userId = request.getParameter("userId");

        if(userId == null) {

            log.warn("userId is empty");

            ctx.setSendZuulResponse(false);

            ctx.setResponseStatusCode(401);

            try {

                ctx.getResponse().getWriter().write("userId is empty");

            }catch (Exception e){}

            return null;

        }

        log.info("ok");

        return null;

    }

}

多个服务共享相同的配置，举个例子，数据库连接，redis连接，还有别的一些东西，包括一些降级开关，等等

用config统一配置中心

1、创建工程config-server

2、pom.xml

<parent>

	<groupId>org.springframework.boot</groupId>

	<artifactId>spring-boot-starter-parent</artifactId>

	<version>1.5.2.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>

</properties>

<dependencies>

	<dependency>

		<groupId>org.springframework.cloud</groupId>

		<artifactId>spring-cloud-config-server</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-eureka</artifactId>

	</dependency>

</dependencies>

<dependencyManagement>

	<dependencies>

		<dependency>

			<groupId>org.springframework.cloud</groupId>

			<artifactId>spring-cloud-dependencies</artifactId>

			<version>Camden.SR6</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>

<repositories>

	<repository>

		<id>spring-milestones</id>

		<name>Spring Milestones</name>

		<url>https://repo.spring.io/milestone</url>

		<snapshots>

			<enabled>false</enabled>

		</snapshots>

	</repository>

</repositories>

2、Application

@SpringBootApplication

@EnableConfigServer

public class ConfigServerApplication {

    public static void main(String[] args) {

        SpringApplication.run(ConfigServerApplication.class, args);

    }

}

3、公开的git仓库

spring cloud config，配置文件，用的是properties的格式，基于git去做

账号：roncoo-eshop

密码：roncoo123456

仓库地址：https://github.com/roncoo-eshop/roncoo-eshop-config

git怎么用，我不讲解了，自己百度或者找资料

3、application.properties

spring.application.name=config-server

server.port=8767

spring.cloud.config.server.git.uri=https://github.com/roncoo-eshop/roncoo-eshop-config

spring.cloud.config.server.git.searchPaths=config-file

spring.cloud.config.label=master

spring.cloud.config.server.git.username=roncoo-eshop

spring.cloud.config.server.git.password=roncoo123456

（1）pom.xml

<dependency>

	<groupId>org.springframework.cloud</groupId>

	<artifactId>spring-cloud-starter-config</artifactId>

</dependency>

（2）application.yml -> bootstrap.properties

spring.application.name=config-client

spring.cloud.config.label=master

spring.cloud.config.profile=dev

spring.cloud.config.uri= http://localhost:8767/

server.port=8764

eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/

feign.hystrix.enabled=true

（3）controller

@Value("${defaultName}")

private String defaultName;

巴特西

Spring Cloud之Zuul网关路由

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