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SpringCloud整合Feign（三）

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导读：本篇文章讲解 SpringCloud整合Feign（三），希望对大家有帮助，欢迎收藏，转发！站点地址：www.bmabk.com

概述

服务注册与发现-Nacos集成到SpringCloud（二）
服务生产者和服务消费者的创建根据上面的文档搭建。

消费者添加feign依赖

 	<!-- feign服务间调用,注意feign版本，版本通过cloud统一管理 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

消费者完整的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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.spring.cloud.nacos</groupId>
    <artifactId>spring-cloud-nacos-consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-cloud-nacos-consumer</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>2020.0.3</spring-cloud.version>
        <spring-cloud-openfeign.version>2.0.0.RELEASE</spring-cloud-openfeign.version>
        <spring-cloud-netflix.version>2.0.0.RELEASE</spring-cloud-netflix.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</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>
		
        <!-- feign服务间调用,注意feign版本，版本通过cloud统一管理 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!-- SpringCloud Feign在Hoxton.M2 RELEASED版本之后不再使用Ribbon而是使用spring-cloud-loadbalancer，所以不引入spring-cloud-loadbalancer会报错 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-loadbalancer</artifactId>
        </dependency>

        <!-- nacos配置 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>com.alibaba.nacos</groupId>
                    <artifactId>nacos-client</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
        </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>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
                <version>0.2.2.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba.nacos</groupId>
                <artifactId>nacos-client</artifactId>
                <version>1.1.0</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

consumer中添加接口

package com.spring.cloud.nacos.springcloudnacosconsumer.api;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
// service-provider必须为服务提供方的应用名称。
@FeignClient(value = "service-provider")
public interface ThirdApi {
    // url方式和地址必须和服务提供方一致
    @GetMapping("/echo/{hello}")
    // 方面名称可以不一致，但是最好一致，这样可以直接知道调用的是哪个方法
    String hello(@PathVariable("hello") String hello);
}

消费者直接注入接口即可

package com.spring.cloud.nacos.springcloudnacosconsumer.controller;

import com.spring.cloud.nacos.springcloudnacosconsumer.api.ThirdApi;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@RequestMapping(value = "/consumer")
public class ConsumerController {
    @Resource
    private ThirdApi thirdApi;

    @GetMapping("/echo/{hello}")
    public String testFeignCall1(@PathVariable String hello) {
        String res = thirdApi.hello(hello);
        return "consumer feign:" + res;
    }
}

启动类添加@EnableFeignClients激活注解

package com.spring.cloud.nacos.springcloudnacosconsumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

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

服务提供者通过jar包提供api接口

新建api接口jar包

  • 把下面的jar包打包，并引入消费者模块即可。

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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.nacos</groupId>
    <artifactId>nacos-provider-API</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>nacos-provider-API</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- feign服务间调用 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

创建接口

  • 接口url需要和服务提供者提供的接口一致。
package com.nacos.nacosproviderapi.api;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
// service-provider:服务提供者的应用名称
@FeignClient(value = "service-provider")
public interface ServiceProviderAPI {
    @GetMapping("/echo/{hello}")
    String hello(@PathVariable("hello") String hello);
}

消费者引入api包

<?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>2.5.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.spring.cloud.nacos</groupId>
    <artifactId>spring-cloud-nacos-consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-cloud-nacos-consumer</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>2020.0.3</spring-cloud.version>
        <spring-cloud-openfeign.version>2.0.0.RELEASE</spring-cloud-openfeign.version>
        <spring-cloud-netflix.version>2.0.0.RELEASE</spring-cloud-netflix.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</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>

        <!-- api接口 -->
        <dependency>
            <groupId>com.nacos</groupId>
            <artifactId>nacos-provider-API</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <!-- SpringCloud Feign在Hoxton.M2 RELEASED版本之后不再使用Ribbon而是使用spring-cloud-loadbalancer，所以不引入spring-cloud-loadbalancer会报错 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-loadbalancer</artifactId>
        </dependency>

        <!-- nacos配置 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>com.alibaba.nacos</groupId>
                    <artifactId>nacos-client</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
        </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>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
                <version>0.2.2.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba.nacos</groupId>
                <artifactId>nacos-client</artifactId>
                <version>1.1.0</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

消费者注入api接口

package com.spring.cloud.nacos.springcloudnacosconsumer.controller;

import com.nacos.nacosproviderapi.api.ServiceProviderAPI;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;

@RestController
@RequestMapping(value = "/consumer")
public class ConsumerController {
    @Resource
    private ServiceProviderAPI providerAPI;
    @GetMapping("/echo/{hello}")
    public String testFeignCall1(@PathVariable String hello) {
        String res = providerAPI.hello(hello);
        return "consumer feign:" + res;
    }
}

消费者启动类激活feign服务

  • 注意：如果是外部的api包，必须再@EnableDiscoveryClient中添加api包的相关路径，否则，找不到相应的bean。
package com.spring.cloud.nacos.springcloudnacosconsumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableDiscoveryClient
// 外部的api接口，需要指定扫描路径，否则bean对象无法注入
@EnableFeignClients(basePackages = {"com.nacos.nacosproviderapi.api"})
public class SpringCloudNacosConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringCloudNacosConsumerApplication.class, args);
    }
}

消费者application.properties修改

server.port=8081
spring.application.name=service-consumer
spring.cloud.nacos.discovery.server-addr=192.168.195.129:8848
# 如果引入外部jar包feign接口，需要设置该项，否则出现重名错误
spring.main.allow-bean-definition-overriding=true

测试

在这里插入图片描述

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