Spring Boot 使用Druid详解

druid是java语言中最好的数据库连接池，并且能够提供强大的监控和扩展功能，下面来说明如何在 springboot 中配置使用druid。
步骤：

1. 在pom.xml中加载依赖

2. 在application.properties中加入数据源配置

3. 编写druidconfiguration，通过@bean注解的方式注入druid servlet和filter，以便提供监控页面访问

4. 浏览器访问

一、在pom.xml中加入依赖

<dependency>
      <groupid>com.alibaba</groupid>
      <artifactid>druid</artifactid>
      <version>1.0.18</version>
  </dependency>

二、在application.properties中加入数据源配置

################## server ################################
server.port=8080

################## datasource ################################
spring.datasource.url = jdbc:mysql://localhost:3306/spring
spring.datasource.username = root
spring.datasource.password = 123456
spring.datasource.driverclassname = com.mysql.jdbc.driver

#使用druid数据源
spring.datasource.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
spring.datasource.initialsize=5
spring.datasource.minidle=5
spring.datasource.maxactive=20

# 配置获取连接等待超时的时间
spring.datasource.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
spring.datasource.timebetweenevictionrunsmillis=60000

# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.minevictableidletimemillis=300000
spring.datasource.validationquery=select 1 fromdual
spring.datasource.testwhileidle=true
spring.datasource.testonborrow=false
spring.datasource.testonreturn=false

# 打开pscache，并且指定每个连接上pscache的大小
spring.datasource.poolpreparedstatements=true
spring.datasource.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
spring.datasource.filters=stat,wall,log4j

# 通过connectproperties属性来打开mergesql功能；慢sql记录
spring.datasource.connectionproperties=druid.stat.mergesql=true;druid.stat.slowsqlmillis=5000

# 合并多个druiddatasource的监控数据
#spring.datasource.useglobaldatasourcestat=true


################ java persistence api ###########################
# specify the dbms
spring.jpa.database = mysql
# show or not log for each sql query
spring.jpa.show-sql = true
# hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update
#[org.hibernate.cfg.improvednamingstrategy #org.hibernate.cfg.defaultnamingstrategy]
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.improvednamingstrategy
# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect= org.hibernate.dialect.mysql5dialect

#暂时不用redis，所以none，spring.session.store-type=reids
spring.session.store-type=none

以上是我项目中的配置信息，大家只要关注datasource部分即可。

三、编写druidconfiguration配置类，通过@bean注解的方式注入druid servlet和filter，以便提供监控页面访问

package com.example.config;

import java.sql.sqlexception;

import javax.sql.datasource;

import org.slf4j.logger;
import org.slf4j.loggerfactory;
import org.springframework.beans.factory.annotation.value;
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 com.alibaba.druid.pool.druiddatasource;
import com.alibaba.druid.support.http.statviewservlet;
import com.alibaba.druid.support.http.webstatfilter;

/**
 * 配置druid数据源
 *
 */
@configuration
public class druidconfiguration {

  private logger logger = loggerfactory.getlogger(druidconfiguration.class);

  @bean
  public servletregistrationbean druidstatviewservlet() {
    servletregistrationbean registrationbean = new servletregistrationbean(new statviewservlet(), "/druid/*");
    registrationbean.addinitparameter("allow", "127.0.0.1");
    registrationbean.addinitparameter("deny", "192.168.31.234");
    registrationbean.addinitparameter("loginusername", "admin");
    registrationbean.addinitparameter("loginpassword", "123456");
    registrationbean.addinitparameter("resetenable", "false");

    return registrationbean;
  }

  @bean
  public filterregistrationbean druidwebstatviewfilter() {
    filterregistrationbean registrationbean = new filterregistrationbean(new webstatfilter());
    registrationbean.addinitparameter("urlpatterns", "/*");
    registrationbean.addinitparameter("exclusions", "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*");

    return registrationbean;

  }

  @bean
  public datasource druiddatasource(@value("${spring.datasource.url}") string url,
      @value("${spring.datasource.driverclassname}") string driver,
      @value("${spring.datasource.username}") string username,
      @value("${spring.datasource.password}") string password,
      @value("${spring.datasource.maxactive}") int maxactive,
      @value("${spring.datasource.filters}") string filters,
      @value("${spring.datasource.initialsize}")
      int initialsize,
      @value("${spring.datasource.minidle}")
      int minidle,
      @value("${spring.datasource.maxwait}")
      int maxwait,
      @value("${spring.datasource.timebetweenevictionrunsmillis}")
      int timebetweenevictionrunsmillis,
      @value("${spring.datasource.minevictableidletimemillis}")
      int minevictableidletimemillis,
      @value("${spring.datasource.validationquery}")
      string validationquery,
      @value("${spring.datasource.testwhileidle}")
      boolean testwhileidle,
      @value("${spring.datasource.testonborrow}")
      boolean testonborrow,
      @value("${spring.datasource.testonreturn}")
      boolean testonreturn,
      @value("${spring.datasource.poolpreparedstatements}")
      boolean poolpreparedstatements,
      @value("${spring.datasource.maxpoolpreparedstatementperconnectionsize}")
      int maxpoolpreparedstatementperconnectionsize,
      @value("${spring.datasource.connectionproperties}")
      string connectionproperties,
      @value("${spring.datasource.useglobaldatasourcestat}")
      boolean useglobaldatasourcestat

  ) {
    druiddatasource datasource = new druiddatasource();
    /*数据源主要配置*/
    datasource.seturl(url);
    datasource.setdriverclassname(driver);
    datasource.setusername(username);
    datasource.setpassword(password);

    /*数据源补充配置*/
    datasource.setmaxactive(maxactive);
    datasource.setinitialsize(initialsize);
    datasource.setminidle(minidle);
    datasource.setmaxwait(maxwait);
    datasource.settimebetweenevictionrunsmillis(timebetweenevictionrunsmillis);
    datasource.setminevictableidletimemillis(minevictableidletimemillis);
    datasource.setvalidationquery(validationquery);
    datasource.settestonborrow(testonborrow);
    datasource.settestonreturn(testonreturn);
    datasource.settestwhileidle(testwhileidle);
    datasource.setpoolpreparedstatements(poolpreparedstatements);
    datasource.setmaxpoolpreparedstatementperconnectionsize(maxpoolpreparedstatementperconnectionsize);
    datasource.setconnectionproperties(connectionproperties);
    datasource.setuseglobaldatasourcestat(useglobaldatasourcestat);

    try {
      datasource.setfilters(filters);
      logger.info("druid数据源初始化设置成功......");
    } catch (sqlexception e) {
      e.printstacktrace();
      logger.info("druid数据源filters设置失败......");
    }
    return datasource;

  }
}

四、浏览器访问

在浏览器中输入http://localhost:8080/druid/index.html，首次访问需要使用账号和密码登录

在数据源一栏中，所有加"*"标识的都不能为空，，尤其是filter类名，否则会看不到sql监控数据。

五、查看sql监控

执行删除某条记录后，查看sql监控

到这里，我们就把druid配置成功了。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：http://blog.csdn.net/linabc123000/article/details/69062204