springboot整合druid连接池

• 依赖

    //mysql 驱动
    compile group: 'mysql', name: 'mysql-connector-java', version: '5.1.21'
    //druid 
    compile group: 'com.alibaba', name: 'druid', version: '1.1.10'

# 1. 新建druid配置信息类DruidConfiguration.java

package com.futao.springmvcdemo.foundation.configuration;

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

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

/**
 * @author futao
 * Created on 2018/10/11.
 * ConfigurationProperties(prefix = "spring.datasource")使用规则，注入的字段如果为private，则必须具有setter方法
 */
@Component
@ConfigurationProperties(prefix = "spring.datasource")
public class DruidConfiguration {

    /**
     * 数据库地址
     */
    private String url;

    /**
     * 用户名
     */
    private String userName;

    /**
     * 密码
     */
    private String password;

    /**
     * 初始化连接数量
     */
    private int initialSize;

    /**
     * 最小闲置连接
     */
    private int minIdle;

    /**
     * 最大存活连接
     */
    private int maxActive;

    /**
     * 配置获取连接等待超时的时间
     */
    private long maxWait;

    /**
     * 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
     */
    private long timeBetweenEvictionRunsMillis;

    /**
     * 配置一个连接在池中最小生存的时间，单位是毫秒
     */
    private long minEvictableIdleTimeMillis;

    /**
     * 配置一个连接在池中最大生存的时间，单位是毫秒
     */
    private long maxEvictableIdleTimeMillis;

    /**
     *
     */
    private boolean testWhileIdle;

    /**
     *
     */
    private boolean testOnBorrow;

    /**
     *
     */
    private boolean testOnReturn;

    /**
     *
     */
    private boolean poolPreparedStatements;

    /**
     *
     */
    private int maxOpenPreparedStatements;

    /**
     *
     */
    private boolean asyncInit;


    @Bean
    public DataSource druidDataSource() throws SQLException {
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setUrl(url);
        druidDataSource.setUsername(userName);
        druidDataSource.setPassword(password);
        druidDataSource.setMaxActive(maxActive);
        druidDataSource.setInitialSize(initialSize);
        druidDataSource.setMaxWait(maxWait);
        druidDataSource.setMinIdle(minIdle);
        druidDataSource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        druidDataSource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        druidDataSource.setMaxEvictableIdleTimeMillis(maxEvictableIdleTimeMillis);
        druidDataSource.setTestWhileIdle(testWhileIdle);
        druidDataSource.setTestOnBorrow(testOnBorrow);
        druidDataSource.setTestOnReturn(testOnReturn);
        druidDataSource.setPoolPreparedStatements(poolPreparedStatements);
        druidDataSource.setMaxOpenPreparedStatements(maxOpenPreparedStatements);
        druidDataSource.setAsyncInit(asyncInit);
        return druidDataSource;
    }

    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 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 long getMaxWait() {
        return maxWait;
    }

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

    public long getTimeBetweenEvictionRunsMillis() {
        return timeBetweenEvictionRunsMillis;
    }

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

    public long getMinEvictableIdleTimeMillis() {
        return minEvictableIdleTimeMillis;
    }

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

    public long getMaxEvictableIdleTimeMillis() {
        return maxEvictableIdleTimeMillis;
    }

    public void setMaxEvictableIdleTimeMillis(long maxEvictableIdleTimeMillis) {
        this.maxEvictableIdleTimeMillis = maxEvictableIdleTimeMillis;
    }

    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 getMaxOpenPreparedStatements() {
        return maxOpenPreparedStatements;
    }

    public void setMaxOpenPreparedStatements(int maxOpenPreparedStatements) {
        this.maxOpenPreparedStatements = maxOpenPreparedStatements;
    }

    public boolean isAsyncInit() {
        return asyncInit;
    }

    public void setAsyncInit(boolean asyncInit) {
        this.asyncInit = asyncInit;
    }
}

# 2. 在application.yml中配置配置信息

spring:
  # 数据源
  datasource:
    url: jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf8
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    platform: mysql
    initialSize: 5
    minIdle: 10
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 2000
    minEvictableIdleTimeMillis: 600000
    maxEvictableIdleTimeMillis: 900000
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    maxOpenPreparedStatements: 20
    asyncInit: true
    filters: stat,wall,log4j
    logSlowSql: true

# 3. 添加过滤器DruidFilter.java

druid除了数据连接池，还集成了对站点的URL进行统计的功能，利用filter忽略druid对某些资源的统计

package com.futao.springmvcdemo.controller;

import com.alibaba.druid.support.http.WebStatFilter;

import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;

/**
 * @author futao
 * Created on 2018/10/11.
 */
@WebFilter(filterName = "DruidFilter", urlPatterns = "/*", initParams = {
        @WebInitParam(name = "exclusions", value = "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")// 忽略资源
})
public class DruidFilter extends WebStatFilter {
}

# 4. 定义DruidServlet.java显示druid管理页面

package com.futao.springmvcdemo.controller;

import com.alibaba.druid.support.http.StatViewServlet;

import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;

/**
 * @author futao
 * Created on 2018/10/11.
 */
@WebServlet(urlPatterns = "/druid/*",
        initParams = {
                @WebInitParam(name = "allow", value = "127.0.0.1"),// IP白名单 (没有配置或者为空，则允许所有访问)
                @WebInitParam(name = "deny", value = "192.168.16.111"),// IP黑名单 (存在共同时，deny优先于allow)
                @WebInitParam(name = "loginUsername", value = "admin"),// 用户名
                @WebInitParam(name = "loginPassword", value = "admin"),// 密码
                @WebInitParam(name = "resetEnable", value = "false")// 禁用HTML页面上的“Reset All”功能
        })
public class DruidServlet extends StatViewServlet {

    private static final long serialVersionUID = -6085007333934055609L;
}

# 5. 对于基于注解的Filter和Servlet需要在SpringBoot的启动类上打上自动扫描注解@@ServletComponentScan

package com.futao.springmvcdemo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

/**
 * @author futao
 * ServletComponentScan 开启servlet和filter
 */
@SpringBootApplication
@ServletComponentScan
@MapperScan("com.futao.springmvcdemo.dao")
//@EnableAspectJAutoProxy
public class SpringmvcdemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringmvcdemoApplication.class, args);
    }
}

# 截一波运行图

登陆
监控页面
监控页面 查看当前池中初始化的连接以及连接命中情况

# 坑

• sql监控页面没有数据:
  检查是否配置了filters
• 数据源页面显示 （*）druid property for user to setup，未关闭数据源，加上destroyMethod

@Bean(destroyMethod = "close", initMethod = "init")
    public DataSource druidDataSource() throws SQLException {
}