SpringBoot集成Nacos以及Feign集成调用

1.继上一篇文章中写到nacos在linux环境下的安装使用，本篇文章写到nacos在实际项目中的应用，首先我们建两个springBoot项目为nacos_server 、nacos_client 这里不多介绍怎么去创建项目了先看下两个项目整体构成：

2.nacos_server项目的pom.xml依赖如下：

<?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>2.2.12.BUILD-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>net.longjin</groupId>
    <artifactId>nacos_server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>nacos_server</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud-alibaba.version>2.2.1.RELEASE</spring-cloud-alibaba.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.72</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</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>
        </repository>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </pluginRepository>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

</project>

3.nacos_server项目启动类引入以下两个注解：@EnableDiscoveryClient（注册中心注册发现）、@EnableFeignClients（feign客户端调用）

4.application.yml配置如下：

#当前使用配置配置
spring:
  profiles:
    active: dev

logging:
  level:
    com:
      alibaba:
        nacos:
          client:
            naming: error

5.bootstrap.yml配置如下：

server:
  port: 9740
  servlet:
    context-path: /ns
  max-http-header-size: 10240
  tomcat:
    uri-encoding: UTF-8
    max-threads: 500
    max-connections: 10000

config:
  nacos:
    ip: 192.168.108.132
    port: 8848
spring:
  application:
    name: nacosServerCenter
  cloud:
    nacos:
      discovery:
        server-addr: ${config.nacos.ip}:${config.nacos.port}
      #以下配置在不需要配置中心的情况下可以注释掉
      config:
        server-addr: ${config.nacos.ip}:${config.nacos.port}
        group: PROD_GROUP
        prefix: application-prod
        file-extension: yml

6.nacos集成主要用到以上两个配置文件至于application-dev.yml 、application-prod.yml、logback-spring.xml这三个配置文件这里就不多讲了 dev和prod测试正式环境根据自己实际项目配置数据源等一些配置 logback-spring.xml文件是日志配置这里根据自己项目实际去配置最后我也会附上完整代码参考

7.nacos_server项目新建一个student的实体类：

package net.longjin.entity;

import lombok.Data;

/**
 * 描述:Student
 *
 * @author 何志鹏
 * @ClassName:Student
 * @create 2020-11-17 16:51
 * Version 1.0
 */
@Data
public class Student {

    /**
     * 主键id
     */
    private  Long id;
    /**
     * 姓名
     */
    private  String name;
    /**
     * 年龄
     */
    private  Integer age;

}

8.nacos_server项目新建一个student类的service层：

package net.longjin.service;

import com.alibaba.fastjson.JSONObject;

/**
 * 描述:StudentService
 *
 * @author 何志鹏
 * @ClassName:StudentService
 * @create 2020-11-17 16:54
 * Version 1.0
 */
public interface StudentService {

    /**
     * 获取学生信息
     *
     * @return
     */
    JSONObject  getInfos();
}

9.nacos_server项目新建一个student类的service实现层：

package net.longjin.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import net.longjin.entity.Student;
import net.longjin.service.StudentService;
import org.springframework.stereotype.Service;

/**
 * 描述:StudentServiceImpl
 *
 * @author 何志鹏
 * @ClassName:StudentServiceImpl
 * @create 2020-11-17 17:10
 * Version 1.0
 */
@Service
public class StudentServiceImpl implements StudentService {


    /**
     * 获取学生信息
     *
     * @return
     */
    @Override
    public JSONObject getInfos() {
        Student student = new Student();
        student.setId(1L);
        student.setName("何志鹏");
        student.setAge(30);
        return JSONObject.parseObject(JSON.toJSONString(student));
    }
}

10.nacos_server项目新建一个student类的controller层：

package net.longjin.controller;

import com.alibaba.fastjson.JSONObject;
import net.longjin.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 描述:StudentController
 *
 * @author 何志鹏
 * @ClassName:StudentController
 * @create 2020-11-17 17:14
 * Version 1.0
 */
@RestController
@RequestMapping("/api/student")
public class StudentController {

    @Autowired
    private StudentService studentService;


    /**
     * 获取学生信息
     *
     * @return
     */
    @RequestMapping("/getInfos")
    public JSONObject  getInfos(){
        return studentService.getInfos();
    }
}

11.启动nacos_server项目后登录nacos发现nacos_server注册到注册中心了如下：

12.然后新建一个nacos_client项目其项目的application.yml、bootstrap.yml、application-dev.yml 、application-prod.yml、logback-spring.xml 、pom.xml 启动类等与nacos_server一样新建一个feign调用的FeignMultipartSupportConfig、主要解决跨服务调用多文件上传入用不到可忽略：

package net.longjin.feignClient;

import feign.RequestTemplate;
import feign.codec.EncodeException;
import feign.codec.Encoder;
import feign.form.ContentType;
import feign.form.FormEncoder;
import feign.form.MultipartFormContentProcessor;
import feign.form.spring.SpringManyMultipartFilesWriter;
import feign.form.spring.SpringSingleMultipartFileWriter;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.support.SpringEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.multipart.MultipartFile;

import java.lang.reflect.Type;
import java.util.*;

/***
 * @author: 何志鹏
 * @Date: 2019/10/10
 */
@Configuration
public class FeignMultipartSupportConfig {

    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;

    @Bean
    public Encoder feignEncoder() {
        return new SpringMultipartEncoder(new SpringEncoder(messageConverters));
    }

    private class SpringMultipartEncoder extends FormEncoder {
        public SpringMultipartEncoder(Encoder delegate) {
            super(delegate);
            MultipartFormContentProcessor processor = (MultipartFormContentProcessor) this.getContentProcessor(ContentType.MULTIPART);
            processor.addFirstWriter(new SpringSingleMultipartFileWriter());
            processor.addFirstWriter(new SpringManyMultipartFilesWriter());
        }

        @Override
        public void encode(Object object, Type bodyType, RequestTemplate template) throws EncodeException {
            if (bodyType.equals(MultipartFile[].class)) {
                MultipartFile[] files = (MultipartFile[]) ((MultipartFile[]) object);
                HashMap data = new HashMap(files.length, 1.0F);
                data.put(files[0].getName(), Arrays.asList(files));
                super.encode(data, MAP_STRING_WILDCARD, template);
            } else if (bodyType.equals(MultipartFile.class)) {
                MultipartFile file = (MultipartFile) object;
                Map<String, Object> data = Collections.singletonMap(file.getName(), object);
                super.encode(data, MAP_STRING_WILDCARD, template);
            } else if ((object instanceof Iterable) && ((Iterable) object).iterator().hasNext() && ((Iterable) object).iterator().next() instanceof MultipartFile) {
                Iterable<?> iterable = (Iterable) object;
                HashMap data = new HashMap();
                Iterator var13 = iterable.iterator();

                while (var13.hasNext()) {
                    Object item = var13.next();
                    MultipartFile file = (MultipartFile) item;
                    data.put(file.getName(), file);
                }

                super.encode(data, MAP_STRING_WILDCARD, template);
            } else {
                super.encode(object, bodyType, template);
            }
        }
    }
}

13.新建一个StudentrFeignClient的方法用来调用nacos_server中的/api/student/getInfos接口代码如下：

package net.longjin.feignClient;
import com.alibaba.fastjson.JSONObject;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;


@FeignClient(name = "nacosServerCenter", path = "ns")
public interface StudentrFeignClient {


    /**
     * 获取学生信息
     *
     * @return
     */
    @RequestMapping(value = "/api/student/getInfos", method = RequestMethod.GET)
    JSONObject getInfos();

}

14.新建一个调用获取学生信息的controller层代码如下：

package net.longjin.controller;

import com.alibaba.fastjson.JSONObject;
import net.longjin.feignClient.StudentrFeignClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 描述:studentController
 *
 * @author 何志鹏
 * @ClassName:studentController
 * @create 2020-11-17 17:22
 * Version 1.0
 */
@RestController
@RequestMapping("api/stu")
public class studentController {

    @Autowired
    private StudentrFeignClient studentrFeignClient;


    /**
     * 获取学生信息
     *
     * @return
     */
    @RequestMapping("/getInfos")
    public JSONObject getInfos(){
        return studentrFeignClient.getInfos();
    }
}

15.启动nacos_client项目看到nacos_client项目已经注册到注册中心里了然后用postman调用就能跨服务调用nacos_server中的服务：

16.最后附上源代码地址：

https://gitee.com/hezhipeng_ek/nacos.git

原文链接：https://blog.csdn.net/weixin_39643007/article/details/109748108

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