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Column introduction

【 Microservices ~ senior 】 At present, it mainly updates micro services , Learn together and progress together .

Introduction to this issue

This issue mainly introduces the actual combat of the configuration center

List of articles

demand

Basic environment

Test configuration

Default

Project package

nacos Configuration database

demand

• Set up user testing service

Basic environment

• Project name ：nacos-config-mysql-2.1

• Add coordinates

<dependencies>
        <!-- web  starter  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- nacos  To configure -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

        <!--swagger2-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
        </dependency>

        <!-- mybatis plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
        </dependency>

        <!-- mysql drive  -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--lombok , @Data  etc. -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>


    </dependencies>

• To write yml file ：bootstrap.yml

#  Service port number 
server:
  port: 7777
#  service name 
spring:
  application:
    name: user-service
  datasource:
    driverClassName: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/cloud_db5?useUnicode=true&characterEncoding=utf8
    username: root
    password: 1234
  cloud:
    nacos:
      config:
        server-addr: 127.0.0.1:8848     # nacos  Service address 
        prefix: user                   # 3.1  Prefix , Default  ${spring.application.name}
        file-extension: yaml            # 3.2  suffix 
        group: DEFAULT_GROUP            # 3.3  Group name 

# Turn on log4j Print SQL sentence 
logging:
  level:
    com:
      czxy:
        changgou4:
          mapper: debug

# mp Log printing 
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

• To write sql sentence

create database cloud_db5;
use cloud_db5;
CREATE TABLE t_user(
  id INT PRIMARY KEY AUTO_INCREMENT,
  username VARCHAR(50)
);

create database cloud_db6;
use cloud_db6;
CREATE TABLE t_user(
  id INT PRIMARY KEY AUTO_INCREMENT,
  username VARCHAR(50)
);

• Write the startup class

package com.czxy;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

• Copy configuration class

• To write domain  

package com.czxy.domain;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;


@TableName("t_user")
@Data
public class User {

    @TableId(type = IdType.AUTO)        // Auto enhance 
    private Integer id;

    private String username;
}

• To write mapper

package com.czxy.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.czxy.domain.User;
import org.apache.ibatis.annotations.Mapper;


@Mapper
public interface UserMapper extends BaseMapper<User> {
}

• To write service

  • Interface

package com.czxy.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.czxy.domain.User;

public interface UserService extends IService<User> {
}

• Implementation class

package com.czxy.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.czxy.domain.User;
import com.czxy.mapper.UserMapper;
import com.czxy.service.UserService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;


@Service
@Transactional
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
}

• To write controller

package com.czxy.controller;

import com.czxy.domain.User;
import com.czxy.service.UserService;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;


@RestController
@RequestMapping("/user")
public class UserController {

    @Resource
    private UserService userService;

    @PostMapping
    public String save(@RequestBody User user) {
        // add to 
        boolean result = userService.save(user);
        // return 
        if(result) {
            return " Add success ";
        }
        return " Add failure ";
    }
}

Test configuration

Default

• Provide database ：cloud_db5

• Yes t_user Table operation

http://localhost:7777/swagger-ui.html

Project package

• With jar Run as a package （ Operations staff ）

• modify pom.xml file , Add the plug-in , Is used to specify the jar The start of class

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <!-- Start class -->
                <mainClass>com.czxy.UserApplication</mainClass>
            </configuration>
        </plugin>
    </plugins>
</build>

pack

function jar, stay cmd In the command window

java -jar nacos-config-mysql-2.1-1.0-SNAPSHOT.jar 

nacos Configuration database

• Provide database ：cloud_db6

• stay nacos Middle configuration

server.port: 7776
spring.datasource.url: jdbc:mysql://127.0.0.1:3306/cloud_db6?useUnicode=true&characterEncoding=utf8

• Must operate ： Restart the service 【 No need to modify the source code 】

• test