JavaEE advanced knowledge learning ----- SpringCloud (2) practice preparation

SpringCloud practice preparation

Project technical version

SpringCloud version: Dalston.SR1, SpringBoot version: 1.5.9

project instruction

The project is to use SpringCloud to integrate four projects, microservicecloud overall parent project Project, microservicecloud-api public submodule Module, microservicecloud-provider-dept-8001 department microservice provider Module, microservicecloud-consumer-dept-80 department microservice consumption Or Module.

1. Parent project creation

In the logical view, select new-Maven Project-check to create a simple project-select the pom method

pom.xml file

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.luo.springcloud</groupId>
	<artifactId>microservicecloud</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>pom</packaging>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
		<junit.version>4.12</junit.version>
		<log4j.version>1.2.17</log4j.version>
		<lombok.version>1.16.18</lombok.version>
	</properties>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Dalston.SR1</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
			<dependency>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-dependencies</artifactId>
				<version>1.5.9.RELEASE</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
			<dependency>
				<groupId>mysql</groupId>
				<artifactId>mysql-connector-java</artifactId>
				<version>5.0.4</version>
			</dependency>
			<dependency>
				<groupId>com.alibaba</groupId>
				<artifactId>druid</artifactId>
				<version>1.0.31</version>
			</dependency>
			<dependency>
				<groupId>org.mybatis.spring.boot</groupId>
				<artifactId>mybatis-spring-boot-starter</artifactId>
				<version>1.3.0</version>
			</dependency>
			<dependency>
				<groupId>ch.qos.logback</groupId>
				<artifactId>logback-core</artifactId>
				<version>1.2.3</version>
			</dependency>
			<dependency>
				<groupId>junit</groupId>
				<artifactId>junit</artifactId>
				<version>${junit.version}</version>
				<scope>test</scope>
			</dependency>
			<dependency>
				<groupId>log4j</groupId>
				<artifactId>log4j</artifactId>
				<version>${log4j.version}</version>
			</dependency>
		</dependencies>
	</dependencyManagement>
</project>

2. Public component project creation

Create a microservicecloud-api project on the parent project, note that a new maven module is created on the microservicecloud, and packaging selects jar

POM.xml file

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.luo.springcloud</groupId>
    <artifactId>microservicecloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>microservicecloud-api</artifactId>
  <dependencies><!-- 当前Module需要用到的jar包，按自己需求添加，如果父类已经包含了，可以不用写版本号 -->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-feign</artifactId>
		</dependency>
	</dependencies>
</project>

Dept entity class

public class Dept implements Serializable{
	private Long deptno; // 主键
	private String dname; // 部门名称、
	private String db_source; // 来自那个数据库，因为微服务可以一个服务对应一个数据库，同一个信息被存储到不同的数据库
	
	public Dept() {
		super();
	}
	public Dept(Long deptno, String dname, String db_source) {
		super();
		this.deptno = deptno;
		this.dname = dname;
		this.db_source = db_source;
	}
	public Long getDeptno() {
		return deptno;
	}
	public void setDeptno(Long deptno) {
		this.deptno = deptno;
	}
	public String getDname() {
		return dname;
	}
	public void setDname(String dname) {
		this.dname = dname;
	}
	public String getDb_source() {
		return db_source;
	}
	public void setDb_source(String db_source) {
		this.db_source = db_source;
	}
	@Override
	public String toString() {
		return "Dept [deptno=" + deptno + ", dname=" + dname + ", db_source=" + db_source + "]";
	}

When we need to create methods such as getter, setter, toString and constructor of an entity class every time, if we add a field, we need to regenerate the method. In order to simplify this repetitive operation, we introduced lombok in the previous pom , the same entity class, the usage method is as follows

@SuppressWarnings("serial")
@AllArgsConstructor
@NoArgsConstructor
@Data
@Accessors(chain=true)
public class Dept implements Serializable{
	private Long deptno; // 主键
	private String dname; // 部门名称
    // 来自那个数据库，因为微服务可以一个服务对应一个数据库，同一个信息被存储到不同的数据库
	private String db_source; 
}

lombok installation method

Copy lombok-1.16.18.jar to the Eclipse directory, execute java -jar D:\javasoft\eclipse-jee-neon-3-win32-x86_64\eclipse\ombok-1.16.18.jar, and select Eclipse installation directory, select install.

lombok annotation use

@Data ：注解在类上；提供类所有属性的 getting 和 setting 方法，此外还提供了equals、canEqual
@Setter：注解在属性上；为属性提供 setting 方法
@Getter：注解在属性上；为属性提供 getting 方法
@Log4j ：注解在类上；为类提供一个 属性名为log 的 log4j 日志对象
@NoArgsConstructor：注解在类上；为类提供一个无参的构造方法
@AllArgsConstructor：注解在类上；为类提供一个全参的构造方法
@Accessors(chain=true)：可以使用链式写法

lombok test

@SuppressWarnings("serial")
@AllArgsConstructor
@NoArgsConstructor
@Data
@Accessors(chain=true)
public class Dept implements Serializable{
	
	private Long deptno; // 主键
	private String dname; // 部门名称、
	private String db_source; // 来自那个数据库，因为微服务可以一个服务对应一个数据库，同一个信息被存储到不同的数据库
	public static void main(String[] args) {
		Dept dept = new Dept();
		dept.setDeptno(12L).setDname("开发部").setDb_source("DB01");
	}
}

Pay attention to the content

The entity class must implement the Serializable interface

Pack and use

After the public component module is written, you can click run as to select maven clean, and then select maven install. The methods referenced by other modules are as follows

<groupId>com.atguigu.springcloud</groupId>
<artifactId>microservicecloud-api</artifactId>
<version>0.0.1-SNAPSHOT</version>

3. Departmental Microservice Providers

First, create a new maven module on the parent project, and modify the pom.xml file for microservicecloud-provider-dept-8001

pom.xml file

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<parent>
		<groupId>com.luo.springcloud</groupId>
		<artifactId>microservicecloud</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>

	<artifactId>microservicecloud-provider-dept-8001</artifactId>

	<dependencies>
		<!-- 引入自己定义的api通用包，可以使用Dept部门Entity -->
		<dependency>
			<groupId>com.luo.springcloud</groupId>
			<artifactId>microservicecloud-api</artifactId>
			<version>${project.version}</version>
		</dependency>
		<!-- actuator监控信息完善 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<!-- 将微服务provider侧注册进eureka -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
		</dependency>
		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-core</artifactId>
		</dependency>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jetty</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>
		</dependency>
		<!-- 修改后立即生效，热部署 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>springloaded</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
		</dependency>
	</dependencies>

</project>

application.yml file

server:
  port: 8001
  
mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml        # mybatis配置文件所在路径
  type-aliases-package: com.luo.springcloud.entities        # 所有Entity别名类所在包
  mapper-locations:
  - classpath:mybatis/mapper/**/*.xml                       # mapper映射文件
    
spring:
   application:
    name: microservicecloud-dept 
   datasource:
    type: com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
    driver-class-name: org.gjt.mm.mysql.Driver              # mysql驱动包
    url: jdbc:mysql://localhost:3306/cloudDB01              # 数据库名称
    username: root
    password: 1234
    dbcp2:
      min-idle: 5                                           # 数据库连接池的最小维持连接数
      initial-size: 5                                       # 初始化连接数
      max-total: 5                                          # 最大连接数
      max-wait-millis: 200                                  # 等待连接获取的最大超时时间
      
eureka:
  client: #客户端注册进eureka服务列表内
    service-url: 
      defaultZone: http://localhost:7001/eureka

under mybatis mybatis.cfg.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
	<settings>
		<setting name="cacheEnabled" value="true" /><!-- 二级缓存开启 -->
	</settings>
</configuration>

SQL statement

DROP DATABASE IF EXISTS cloudDB01 ;

CREATE DATABASE cloudDB01 CHARACTER SET UTF8 ;

USE cloudDB01 ;

CREATE TABLE dept (
  deptno BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
  dname VARCHAR (60),
  db_source VARCHAR (60)
) ;

INSERT INTO dept(dname,db_source) VALUES('开发部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('人事部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('财务部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('市场部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('运维部',DATABASE());

dao interface

@Mapper
public interface DeptDao {
	
	public boolean addDept(Dept dept);
	public Dept findById(Long id);
	public List<Dept> findAll();

}

DeptMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.luo.springcloud.dao.DeptDao">
	<select id="findById" resultType="Dept" parameterType="Long">
		select deptno,dname,db_source from dept where deptno=#{deptno};
	</select>
	<select id="findAll" resultType="Dept">
		select deptno,dname,db_source from dept;
	</select>
	<insert id="addDept" parameterType="Dept">
		INSERT INTO dept(dname,db_source) VALUES(#{dname},DATABASE());
	</insert>
</mapper>

DeptService

public interface DeptService {
	public boolean add(Dept dept);
	public Dept get(Long id);
	public List<Dept> list();
}

DeptServiceImpl

@Service
public class DeptServiceImpl implements DeptService{
	@Autowired
	private DeptDao dao;

	@Override
	public boolean add(Dept dept) {
		return dao.addDept(dept);
	}

	@Override
	public Dept get(Long id) {
		return dao.findById(id);
	}

	@Override
	public List<Dept> list() {
		return dao.findAll();
	}
}

DeptController

@RestController
public class DeptController {
	@Autowired
	private DeptService service;
	
	@RequestMapping(value="/dept/add",method=RequestMethod.POST)
	public boolean add(@RequestBody Dept dept){
		return service.add(dept);
	}
	
	@RequestMapping(value="dept/get/{id}",method=RequestMethod.GET)
	public Dept get(@PathVariable("id") Long id){
		return service.get(id);
	}
	
	@RequestMapping(value="dept/list",method=RequestMethod.GET)
	public List<Dept> list(){
		return service.list();
	}
}

Create the main startup class DeptProvider8001_App

@SpringBootApplication
public class DeptProvider8001_App {
	public static void main(String[] args) {
		SpringApplication.run(DeptProvider8001_App.class, args);
	}
}

Test Results

Enter http://localhost:8001/dept/list to return data in JSON

4. Departmental Microservice Consumers

First, create a new maven module on the parent project, and modify the pom.xml file for microservicecloud-consumer-dept-80.

POM.xml file

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<parent>
		<groupId>com.luo.springcloud</groupId>
		<artifactId>microservicecloud</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>

	<artifactId>microservicecloud-consumer-dept-80</artifactId>
	<description>部门微服务消费者</description>

	<dependencies>
		<dependency><!-- 自己定义的api -->
			<groupId>com.luo.springcloud</groupId>
			<artifactId>microservicecloud-api</artifactId>
			<version>${project.version}</version>
		</dependency>
		<!-- Ribbon相关 -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-ribbon</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- 修改后立即生效，热部署 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>springloaded</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
		</dependency>
	</dependencies>
</project>

application.yml file

server:
  port: 80

ConfigBean annotation class

@Configuration
public class ConfigBean {
    @Bean
	public RestTemplate geRestTemplate(){
		return new RestTemplate();
	}
}

RestTemplate

RestTemplate provides a variety of convenient methods for accessing remote Http services. It is a simple, efficient and convenient access to restful service template classes. It is a set of client-side template tool classes provided by Spring for accessing Rest services. The usage methods are as follows

(url, requestMap, ResponseBean.class) The three parameters represent the Rest request address, request parameters, and the type of object to be converted by HTTP response conversion.

DeptController_Consumer

@RestController
public class DeptController_Consumer {
	private static final String REST_URL_PREFIX = "http://localhost:8001";
	@Autowired
	private RestTemplate restTemplate;
	
	@RequestMapping(value="/consumer/dept/add")
	public boolean add(Dept dept){
		return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add", dept, Boolean.class);
	}
	
	@RequestMapping(value="/consumer/dept/get/{id}")
	public Dept get(@PathVariable("id") Long id){
		return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id, Dept.class);
	}
	
	@RequestMapping(value="/consumer/dept/list")
	public Dept list(){
		return restTemplate.getForObject(REST_URL_PREFIX+"/dept/list/", Dept.class);
	}
}

DeptConsumer80_App main class

@SpringBootApplication
public class DeptConsumer80_App {
	public static void main(String[] args) {
		SpringApplication.run(DeptConsumer80_App.class, args);
	}
}

Test Results

http://localhost/consumer/dept/list

http://localhost/consumer/dept/get/2

http://localhost/consumer/dept/add?dname=AI