Spring Cloud微服务架构（十二）分布式配置中心（spring cloud config）客户端 config client , Druid 提高数据库访问性能

1、构建Config client

创建完pom文件修改如下

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

    <groupId>com.vesus</groupId>
    <artifactId>springcloud-druid</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springcloud-druid</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>com.vesus</groupId>
        <artifactId>springcloud-demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!-- eureka：微服务注册 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <!--config client :-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <!--spring jpa-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!-- mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--druid-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.29</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2、创建bootstrap.yml配置文件

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/ # 注册中心地址
spring:
  application:
    name: springcloud-config-client
  cloud:
    config:
      name: springcloud-config-server #配置文件
      profile: dev
      label: master #配置文件所在分支
      discovery:
        enabled: true #开启配置服务发现
        service-id: springcloud-config-server #配置服务实例名称
      uri: http://localhost:8770/ #配置服务中心
server:
  port: 8772

4、入口方法。

package com.vesus.springclouddruid;

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

@SpringBootApplication
@EnableDiscoveryClient
public class SpringcloudDruidApplication {

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

5、修改远程仓库数据源文件springcloud-config-server-dev.properties

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=123456
#初始化大小
spring.datasource.initial-size=5
#最小
spring.datasource.min-idle=5
#最大
spring.datasource.max-active=20
#配置获取连接等待超时的时间
spring.datasource.max-wait=60000
#配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.datasource.time-between-eviction-runs-millis=60000
#配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.min-evictable-idle-time-millis=300000
#打开PSCache,并且指定每个连接上的PSCache的大小
spring.datasource.pool-prepared-statements=true
spring.datasource.max-pool-prepared-statement-per-connection-size=20
#配置监控统计拦截的filters,去掉后监控界面sql无法统计 wall用于防火墙
spring.datasource.filters=stat,wall,log4j
spring.datasource.connection-properties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

6、配置数据源，读取远程数据源配置文件

package com.vesus.springclouddruid.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.sql.SQLException;

@Configuration
public class DruidConfiguration {


    @Value("${spring.datasource.url}")
    private String dbUrl;
    @Value("${spring.datasource.username}")
    private String username;
    @Value("${spring.datasource.password}")
    private String password;
    @Value("${spring.datasource.driver-class-name}")
    private String driverClassName;
    @Value("${spring.datasource.initial-size}")
    private int initialSize;
    @Value("${spring.datasource.min-idle}")
    private int minIdle;
    @Value("${spring.datasource.max-active}")
    private int maxActive;
    @Value("${spring.datasource.max-wait}")
    private int maxWait;
    @Value("${spring.datasource.time-between-eviction-runs-millis}")
    private int timeBetweenEvictionRunsMillis;
    @Value("${spring.datasource.min-evictable-idle-time-millis}")
    private int minEvictableIdleTimeMillis;
    @Value("${spring.datasource.pool-prepared-statements}")
    private boolean poolPreparedStatements;
    @Value("${spring.datasource.max-pool-prepared-statement-per-connection-size}")
    private int maxPoolPreparedStatementPerConnectionSize;
    @Value("${spring.datasource.filters}")
    private String filters;
    @Value("${spring.datasource.connection-properties}")
    private String connectionProperties;

    @Bean
    public DataSource dataSource(){

        DruidDataSource datasource = new DruidDataSource();
        try {
            datasource.setUrl(this.dbUrl);
            datasource.setUsername(username);
            datasource.setPassword(password);
            datasource.setDriverClassName(driverClassName);

            //configuration
            datasource.setInitialSize(initialSize);
            datasource.setMinIdle(minIdle);
            datasource.setMaxActive(maxActive);
            datasource.setMaxWait(maxWait);
            datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
            datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
            datasource.setPoolPreparedStatements(poolPreparedStatements);
            datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
            datasource.setFilters(filters);
            datasource.setConnectionProperties(connectionProperties);
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return datasource;
    }

}

7、增加UserController

package com.vesus.springcloudconfig.controller;

import com.vesus.springcloudconfig.model.User;
import com.vesus.springcloudconfig.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserController {

    @Autowired
    UserService userService ;

    @Value("${jdbc.username}")
    String username;

    @RequestMapping(value = "/name")
    public String username(){
        return username;
    }

    @RequestMapping(value = "/userlist")
    public List<User> getUserList(){
        return userService.findAll() ;
    }
}

8、访问 http://localhost:8772/userlist

[{"id":1,"name":"admin","age":21,"address":"111","password":"123456"}]

源码：https://gitee.com/vesus198/springcloud-demo/tree/master/springcloud-druid