二、springBoot+gradle+postgresql运行环境配置以及集成druid连接池（application.yml）

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#postgresql #配置 #application #druid

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本文详细介绍了如何在SpringBoot项目中配置Druid数据库连接池，包括无连接池的基本配置，以及添加连接池后的高级配置，如监控、过滤器等，适用于PostgreSQL数据库。

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一、没有连接池的配置

server:
  port: 4567

spring:
  datasource:
    username: postgres
    password: 123456
    url: jdbc:postgresql://localhost:5432/myjpaproject
    driver-class-name: org.postgresql.Driver
  jpa:
    database-platform: org.hibernate.dialect.PostgreSQL95Dialect  #设置方言
    properties:
      hibernate:
        jdbc.lob.non_contextual_creation: true #防止postgresql数据库因未实现CLOB格式而造成的数据检查出错

或者多环境配置(此处仅添加了开发环境) ，测试与生产环境往后添加即可

server:
  port: 4567

spring:
  profiles:
      active: dev #默认激活的profiles
  jpa:
    database-platform: org.hibernate.dialect.PostgreSQL95Dialect  #设置方言
    properties:
      hibernate:
        jdbc.lob.non_contextual_creation: true #防止postgresql数据库因未实现CLOB格式而造成的数据检查出错


---
spring:
  profiles: dev
  datasource:
    driver-class-name: org.postgresql.Driver
    url: jdbc:postgresql://localhost:5432/myjpaproject
    username: postgres
    password: 123456

二、有连接池的配置

build.gradle中添加包

// druid数据库连接池
implementation 'com.alibaba:druid-spring-boot-starter:1.1.10'

配置：

server:
  port: 4567

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      driver-class-name: org.postgresql.Driver
      url: jdbc:postgresql://localhost:5432/myjpaproject
      username: postgres
      password: 123456
      filters: stat #别名方式，扩展插件，监控统计用的filter:stat，日志用的filter:log4j，防御sql注入的filter:wall

或者

server:
  port: 4567

spring:
  application:
    name: firstproject
  profiles:
      active: dev #默认激活的profiles
  jpa:
    database-platform: org.hibernate.dialect.PostgreSQL95Dialect  #设置方言
    generate-ddl: true  #允许生成数据库表结构
    open-in-view: true
    hibernate:
      ddl-auto: update  #设置ddl自动操作的类型
    properties:
      hibernate:
        jdbc.lob.non_contextual_creation: true #防止postgresql数据库因未实现CLOB格式而造成的数据检查出错
  data:
    jpa:
      repositories:
        enabled: true  #是否开启JPA支持
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      driver-class-name: org.postgresql.Driver
      # 下面为连接池的补充设置，应用到上面所有数据源中
      # 初始化大小，最小，最大
      initialSize: 1
      minIdle: 3
      maxActive: 20
      # 配置获取连接等待超时的时间
      maxWait: 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
      timeBetweenEvictionRunsMillis: 60000
      # 配置一个连接在池中最小生存的时间，单位是毫秒
      minEvictableIdleTimeMillis: 30000
      validationQuery: select 'x'
      testWhileIdle: true
      testOnBorrow: false
      testOnReturn: false
      # 打开PSCache，并且指定每个连接上PSCache的大小
      poolPreparedStatements: true
      maxPoolPreparedStatementPerConnectionSize: 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，#别名方式，扩展插件，监控统计用的filter:stat，日志用的filter:log4j，防御sql注入的filter:wall
      filters: stat,slf4j,wall
      # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
      connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000


---
spring:
  profiles: dev
  datasource:
    druid:
      url: jdbc:postgresql://localhost:5432/firstproject
      username: postgres
      password: 123456
      filters: stat #别名方式，扩展插件，监控统计用的filter:stat，日志用的filter:log4j，防御sql注入的filter:wall

springBoot配置druid方式(使用java文件加载配置)

1、application.yml配置(确保druid包已经加载进来)

spring:
  datasource:
    driver-class-name: org.postgresql.Driver
    url: jdbc:postgresql://localhost:5432/firstproject
    username: postgres
    password: 123456
    type: com.alibaba.druid.pool.DruidDataSource
    # 下面为连接池的补充设置，应用到上面所有数据源中
    # 初始化大小，最小，最大
    initialSize: 1
    minIdle: 3
    maxActive: 20
    # 配置获取连接等待超时的时间
    maxWait: 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
    timeBetweenEvictionRunsMillis: 60000
    # 配置一个连接在池中最小生存的时间，单位是毫秒
    minEvictableIdleTimeMillis: 30000
    validationQuery: select 'x'
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    # 打开PSCache，并且指定每个连接上PSCache的大小
    poolPreparedStatements: true
    maxPoolPreparedStatementPerConnectionSize: 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
    filters: stat,slf4j
    # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
    platform: postgresql
    # 合并多个DruidDataSource的监控数据
    #useGlobalDataSourceStat: true
    packages.to.scan: com.trgis.firstproject

2、创建配置文件加载

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

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

/**
 * Druid数据源连接池配置
 */
@Configuration
public class DruidConfig {

    private static final String DB_PREFIX = "spring.datasource";

    @ConfigurationProperties(prefix = DB_PREFIX)
    class IDataSourceProperties {
        private String url;
        private String username;
        private String password;
        private String driverClassName;
        private int initialSize;
        private int minIdle;
        private int maxActive;
        private int maxWait;
        private int timeBetweenEvictionRunsMillis;
        private int minEvictableIdleTimeMillis;
        private String validationQuery;
        private boolean testWhileIdle;
        private boolean testOnBorrow;
        private boolean testOnReturn;
        private boolean poolPreparedStatements;
        private int maxPoolPreparedStatementPerConnectionSize;
        private String filters;
        private String connectionProperties;

        @Bean     //声明其为Bean实例
        @Primary  //在同样的DataSource中，首先使用被标注的DataSource
        public DataSource dataSource() {
            DruidDataSource datasource = new DruidDataSource();
            datasource.setUrl(url);
            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.setValidationQuery(validationQuery);
            datasource.setTestWhileIdle(testWhileIdle);
            datasource.setTestOnBorrow(testOnBorrow);
            datasource.setTestOnReturn(testOnReturn);
            datasource.setPoolPreparedStatements(poolPreparedStatements);
            datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
            try {
                datasource.setFilters(filters);
            } catch (SQLException e) {
                System.err.println("druid configuration initialization filter: " + e);
            }
            datasource.setConnectionProperties(connectionProperties);
            return datasource;
        }

        public String getUrl() {
            return url;
        }

        public void setUrl(String url) {
            this.url = url;
        }

        public String getUsername() {
            return username;
        }

        public void setUsername(String username) {
            this.username = username;
        }

        public String getPassword() {
            return password;
        }

        public void setPassword(String password) {
            this.password = password;
        }

        public String getDriverClassName() {
            return driverClassName;
        }

        public void setDriverClassName(String driverClassName) {
            this.driverClassName = driverClassName;
        }

        public int getInitialSize() {
            return initialSize;
        }

        public void setInitialSize(int initialSize) {
            this.initialSize = initialSize;
        }

        public int getMinIdle() {
            return minIdle;
        }

        public void setMinIdle(int minIdle) {
            this.minIdle = minIdle;
        }

        public int getMaxActive() {
            return maxActive;
        }

        public void setMaxActive(int maxActive) {
            this.maxActive = maxActive;
        }

        public int getMaxWait() {
            return maxWait;
        }

        public void setMaxWait(int maxWait) {
            this.maxWait = maxWait;
        }

        public int getTimeBetweenEvictionRunsMillis() {
            return timeBetweenEvictionRunsMillis;
        }

        public void setTimeBetweenEvictionRunsMillis(int timeBetweenEvictionRunsMillis) {
            this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
        }

        public int getMinEvictableIdleTimeMillis() {
            return minEvictableIdleTimeMillis;
        }

        public void setMinEvictableIdleTimeMillis(int minEvictableIdleTimeMillis) {
            this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
        }

        public String getValidationQuery() {
            return validationQuery;
        }

        public void setValidationQuery(String validationQuery) {
            this.validationQuery = validationQuery;
        }

        public boolean isTestWhileIdle() {
            return testWhileIdle;
        }

        public void setTestWhileIdle(boolean testWhileIdle) {
            this.testWhileIdle = testWhileIdle;
        }

        public boolean isTestOnBorrow() {
            return testOnBorrow;
        }

        public void setTestOnBorrow(boolean testOnBorrow) {
            this.testOnBorrow = testOnBorrow;
        }

        public boolean isTestOnReturn() {
            return testOnReturn;
        }

        public void setTestOnReturn(boolean testOnReturn) {
            this.testOnReturn = testOnReturn;
        }

        public boolean isPoolPreparedStatements() {
            return poolPreparedStatements;
        }

        public void setPoolPreparedStatements(boolean poolPreparedStatements) {
            this.poolPreparedStatements = poolPreparedStatements;
        }

        public int getMaxPoolPreparedStatementPerConnectionSize() {
            return maxPoolPreparedStatementPerConnectionSize;
        }

        public void setMaxPoolPreparedStatementPerConnectionSize(int maxPoolPreparedStatementPerConnectionSize) {
            this.maxPoolPreparedStatementPerConnectionSize = maxPoolPreparedStatementPerConnectionSize;
        }

        public String getFilters() {
            return filters;
        }

        public void setFilters(String filters) {
            this.filters = filters;
        }

        public String getConnectionProperties() {
            return connectionProperties;
        }

        public void setConnectionProperties(String connectionProperties) {
            this.connectionProperties = connectionProperties;
        }
    }

扩展：若是需要druid监控，则添加一下代码到项目，访问http://localhost:端口号/druid/login.html输入下面配置的账密即可进入监控

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

@Configuration
public class DruidConfig {

    @Bean
    public ServletRegistrationBean druidServlet() {// 主要实现web监控的配置处理
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(
                new StatViewServlet(), "/druid/*");//表示进行druid监控的配置处理操作
        servletRegistrationBean.addInitParameter("allow", "127.0.0.1,192.168.0.12");//白名单
        servletRegistrationBean.addInitParameter("deny", "129.168.1.12");//黑名单
        servletRegistrationBean.addInitParameter("loginUsername", "root");//用户名
        servletRegistrationBean.addInitParameter("loginPassword", "123456");//密码
        servletRegistrationBean.addInitParameter("resetEnable", "false");//是否可以重置数据源
        return servletRegistrationBean;

    }

    @Bean    //监控
    public FilterRegistrationBean filterRegistrationBean(){
        FilterRegistrationBean filterRegistrationBean=new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");//所有请求进行监控处理
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.css,/druid/*");//排除
        return filterRegistrationBean;
    }

    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }

}