spring-clound基础开发

一、使用openfeig调用远程另外一个服务接口

• 1、创建一个spring boot工程,并且创建2个模块来当微服务模块

• 2、分别配置2个模块的启动文件

• 3、分别两个模块下创建一个测试的控制器

• 4、在项目的根目录的pom.xml中添加spring-cloud配置

  <properties><java.version>1.8</java.version><spring-cloud.version>2021.0.8</spring-cloud.version>
  </properties>
  

  <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>
  

• 5、在需要调用别的服务的项目中添加依赖

  <!--    远程调用的包    -->
  <dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId>
  </dependency>
  <dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-loadbalancer</artifactId>
  </dependency>
  

• 6、在需要调用别的 服务的项目中创建一个文件夹feign，里面创建一个文件SystemFeignHello.java的接口

  package com.example.feign;import org.springframework.cloud.openfeign.FeignClient;
  import org.springframework.web.bind.annotation.GetMapping;@FeignClient(name = "system", url = "http://localhost:9001/system")
  public interface SystemFeignHello {/*** 别的地方调用hell1方法的时候就会调用http://localhost:9001/system/hello路由* @return*/@GetMapping("hello")String hello1();
  }
  

• 7、测试调用另外一个服务的接口

  package com.example.controller;import com.example.feign.SystemFeignHello;
  import org.springframework.web.bind.annotation.GetMapping;
  import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;@RestController
  public class HelloController {@ResourceSystemFeignHello systemFeignHello;@GetMapping("hello")public String hello() {return "File Hello";}@GetMapping("systemHello")public String getHello() {String helloResult = this.systemFeignHello.hello1();System.out.println(helloResult+"返回数据");return helloResult;}
  }
  

• 8、在调用服务的启动类上加上扫描注解

  package com.example;import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.cloud.openfeign.EnableFeignClients;@SpringBootApplication
  @EnableFeignClients("com.example.feign")
  public class FileApplication {public static void main(String[] args) {SpringApplication.run(FileApplication.class, args);}}
  

• 9、网页上测试调用接口

• 10、system项目中接口如下,和普通接口没任何区别

  package com.example.controller;import org.springframework.web.bind.annotation.GetMapping;
  import org.springframework.web.bind.annotation.RestController;@RestController
  public class HelloController {@GetMapping("hello")public String hello() {return "System Hello11";}
  }
  

二、使用eureka来服务端配置

• 1、eureka分为服务端和客户端，需要在项目中先创建一个eureka的服务段,在子项目中使用客户端的方式连接

• 2、创建一个eureka模块来做服务端

• 3、在eureka模块中添加依赖包

  <dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-server</artifactId></dependency>
  </dependencies>
  

• 4、配置文件中基本配置

  spring.application.name=eureka
  server.port=8761
  eureka.client.fetch-registry=false
  eureka.client.register-with-eureka=false
  

• 5、在启动类上添加注解

  package com.example;import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;@SpringBootApplication
  @EnableEurekaServer
  public class EurekaApplication {public static void main(String[] args) {SpringApplication.run(EurekaApplication.class, args);}}
  

• 6、直接在浏览器上输入http://localhost:8761/如下就表示配置成功

  

三、客户端配置

• 1、引入依赖包

  <!--    客户端端    -->
  <dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
  </dependency>
  

• 2、在配置文件中添加

  eurec.client.server-url.defaultZone=http://localhost:8761/eureka/
  

• 3、在启动文件中添加

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

• 4、刷新浏览器查看服务是否已经注册成功

  

四、网关的配置

• 1、创建一个网关模块

• 2、在网关中引入依赖包

  <dependencies><!-- 网关依赖 --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-gateway</artifactId></dependency><!--    客户端端    --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-client</artifactId></dependency>
  </dependencies>
  

• 3、修改配置文件

  server.port=8000
  spring.application.name=gateway
  server.servlet.context-path=/gateway
  spring.main.web-application-type=reactive 
  eurec.client.server-url.defaultZone=http://localhost:8761/eureka/# 注册一个服务
  spring.cloud.gateway.routes[0].id=system
  spring.cloud.gateway.routes[0].uri.=http://localhost:9001
  spring.cloud.gateway.routes[0].predicates[0].name=Path
  spring.cloud.gateway.routes[0].predicates[0].args[0]=/system/**
  # 注册一个服务
  spring.cloud.gateway.routes[1].id=file
  spring.cloud.gateway.routes[1].uri.=http://localhost:9000
  spring.cloud.gateway.routes[1].predicates[0].name=Path
  spring.cloud.gateway.routes[1].predicates[0].args[0]=/file/**
  

• 4、启动文件

  package com.example;import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication
  @EnableEurekaClient
  public class GatewayApplication {public static void main(String[] args) {SpringApplication.run(GatewayApplication.class, args);}}
  

• 5、使用网关的地址直接访问别的路由http://localhost:8000/system/hello