FeignClient+Nacos(单机测试及源码),微服务1调用微服务2的URL
FeignClient+Nacos(单机测试及源码),服务1调用服务2的URL
FeignClient+Nacos(单机测试及源码),微服务1调用微服务2的URL
问题背景
最近在做微服务 URL 调用,除了使用 okhttp 依赖以外,发现还可以使用一种常用的方式,使用spring-cloud-starter-openfeign依赖,可以根据本文的代码自己创建工程,也可以直接下载源码
注意事项:
- 默认已安装JDK
- Nacos服务端的下载链接,github可能下载很慢,可以下载这个地址
- Nacos快速入门文档,注意单机模式的启动方式:startup.cmd -m standalone ,脚本在bin文件中,也可以打开脚本,更改脚本指令直接启动
再该文件夹下按住shift,再右键,选择powershell
输入指令
startup.cmd -m standalone
或者打开脚本,直接更改模式,双击启动脚本即可
登录注册中心http://localhost:8848/nacos,默认账号和密码都为:nacos
- 必须要有注册中心,可以用Eurake和Nacos,本文使用的Nacos
- 版本号必须兼容,不然会报很多找不到类的错误,这个坑太大了,我搞了好久,springboot和springcloud的兼容性相当不好
代码步骤
1 service1微服务
1.1 先创建module工程,引入父类依赖,版本都是经过我的调试,可以编译通过
<?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>
<groupId>com.yg</groupId>
<artifactId>sleuthTest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<modules>
<module>service1</module>
<module>service2</module>
</modules>
<name>sleuthTest</name>
<description>sleuthTest</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</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-openfeign</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
<!-- <version>2.1.0.RELEASE</version>-->
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<!--Spring Cloud-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Hoxton.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>2.2.1.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
1.2 创建service1微服务,引入pom文件
<?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>
<groupId>com.yg</groupId>
<artifactId>service1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>com.yg</groupId>
<artifactId>sleuthTest</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<name>service1</name>
<description>service1</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
</dependencies>
</project>
1.3 在service1项目的启动类中添加注解@EnableFeignClients、@EnableDiscoveryClient
package com.yg.service1;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@EnableFeignClients
@SpringBootApplication
@EnableDiscoveryClient
public class Service1Application {
public static void main(String[] args) {
SpringApplication.run(Service1Application.class, args);
}
}
1.4 在service1项目中创建调用的外部服务接口类
package com.yg.service1.controller;
import com.yg.service1.fallback.Service2ControllerFallbackFactory;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
@FeignClient(value = "service2",fallbackFactory = Service2ControllerFallbackFactory.class)
public interface Service2Controller {
@GetMapping("/test2")
String getTest2();
}
1.5 实现FallbackFactory
package com.yg.service1.fallback;
import com.yg.service1.controller.Service2Controller;
import feign.hystrix.FallbackFactory;
import org.springframework.stereotype.Component;
@Component
public class Service2ControllerFallbackFactory implements FallbackFactory<Service2Controller> {
@Override
public Service2Controller create(Throwable throwable) {
return null;
}
}
1.6 创建controller类,编写调用service2的方法
package com.yg.service1.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class Service1Controller {
@Autowired
private Service2Controller service2Controller;
@GetMapping("/test")
public String test(){
System.out.println("Test success");
return "I am YuanGe";
}
@GetMapping("/test1")
public String test1(){
System.out.println("test11111");
System.out.println(service2Controller.getTest2());
return "I am test11111";
}
}
1.7 更改配置文件,添加到注册中心,更改服务名,这样才能在注册中心找到
server:
port: 3901
spring:
application:
name: service1
cloud:
nacos:
discovery:
server-addr: localhost:8848
2 service2微服务
2.1 创建service2微服务,引入pom依赖
<?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>
<groupId>com.yg</groupId>
<artifactId>service2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>com.yg</groupId>
<artifactId>sleuthTest</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<name>service2</name>
<description>service2</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
</dependencies>
</project>
2.2 service2项目启动类添加注解
package com.yg.service2;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient
public class Service2Application {
public static void main(String[] args) {
SpringApplication.run(Service2Application.class, args);
}
}
2.3 创建controller控制类,API和service1对应
package com.yg.service2.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class Service2Controller {
@GetMapping("/test")
public String test(){
System.out.println("Received");
return "I am YuanGe";
}
@GetMapping("/test2")
public String test2(){
System.out.println("test22222");
return "I am test22222";
}
}
2.4 更改配置文件,更改服务名,这样才能在注册中心找到
server:
port: 3902
spring:
application:
name: service2
cloud:
nacos:
discovery:
server-addr: localhost:8848
2.5 整体项目文件目录
测试流程
1 启动service1微服务
2 启动service2微服务
3 登录注册中心http://localhost:8848/nacos,输入账号 nacos,输入密码 nacos
4 打开空白网页调用service1微服务接口,然后service1再调用service2
心得
- 版本兼容性问题,真的搞了我两天,非常蓝瘦,下次有时间要研究一下版本兼容的对策了
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