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;