SpringBoot: spring boot使用Druid和监控配置

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。
Spring Boot默认的数据源是：org.apache.tomcat.jdbc.pool.DataSource


如何在 spring Boot 中配置使用Druid，整体步骤：
(1)    ——   Druid简单介绍，具体看官网；
(2)     —— 在pom.xml配置druid依赖包；
(3)    ——  配置application.properties加入数据库源类型等参数；
(4)     —— 编写druid servlet和filter提供监控页面访问；
(5)     —— 输入地址进行测试； 

具体：

(1)添加Maven依赖 (或jar包)

<dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.18</version></dependency>

(2)、配置数据源相关信息（application.properties）

# 数据库访问配置# 主数据源，默认的spring.datasource.type=com.alibaba.druid.pool.DruidDataSourcespring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://localhost:3306/testspring.datasource.username=rootspring.datasource.password=123456# 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=5spring.datasource.minIdle=5spring.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=300000spring.datasource.validationQuery=SELECT 1 FROM DUALspring.datasource.testWhileIdle=truespring.datasource.testOnBorrow=falsespring.datasource.testOnReturn=false# 打开PSCache，并且指定每个连接上PSCache的大小spring.datasource.poolPreparedStatements=truespring.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  

(3) 配置监控统计功能，使用代码注册Servlet

/**     * 注册一个StatViewServlet     * @return     */    @Bean    public ServletRegistrationBean druidStatViewServle(){        //org.springframework.boot.context.embedded.ServletRegistrationBean提供类的进行注册.        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");        //添加初始化参数：initParams        //白名单：        servletRegistrationBean.addInitParameter("allow","127.0.0.1");        //IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.        servletRegistrationBean.addInitParameter("deny","192.168.1.11");        //登录查看信息的账号密码.        servletRegistrationBean.addInitParameter("loginUsername","admin");        servletRegistrationBean.addInitParameter("loginPassword","123456");        //是否能够重置数据.        servletRegistrationBean.addInitParameter("resetEnable","false");        return servletRegistrationBean;    }    /**     * 注册一个：filterRegistrationBean     * @return     */    @Bean    public FilterRegistrationBean druidStatFilter(){        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());        //添加过滤规则.        filterRegistrationBean.addUrlPatterns("/*");        //添加不需要忽略的格式信息.        filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");        return filterRegistrationBean;    }

/**     * 加载druid数据库连接池     * @return 返回DruidDataSource对象     */    private DruidDataSource cfgDataSource(){        DruidDataSource druidDs = new DruidDataSource();        String initialSize = cfgService().get(DBConstants.DURIDINITIALSIZE);        String minIdle = cfgService().get(DBConstants.DURIDMINIDLE);        String maxActive = cfgService().get(DBConstants.DURIDMAXACTIVE);        String maxWait = cfgService().get(DBConstants.DURIDMAXWAIT);        String timeBetweenEvictionRunsMillis = cfgService().get(DBConstants.DURIDTIMEBETWEENEVICTIONRUNSMILLIS);        String minEvictableIdleTimeMillis = cfgService().get(DBConstants.DURIDMINEVICTABLEIDLETIMEMILLIS);        String validationQuery = cfgService().get(DBConstants.DURIDVALIDATIONQUERY);        String testwhileIdle = cfgService().get(DBConstants.DURIDTESTWHILEIDLE);        String testOnBorrow = cfgService().get(DBConstants.DURIDTESTONBORROW);        String testOnReturn = cfgService().get(DBConstants.DURIDTESTONRETURN);        String poolPreparedStatements = cfgService().get(DBConstants.DURIDPOOLPREPAREDSTATEMENTS);        String maxPoolPreparedStatementPerConnectionSize = cfgService().get(DBConstants.DURIDMAXPOOLPREPAREDSTATEMENTPERCONNECTIONSIZE);        String removeAbandoned = cfgService().get(DBConstants.REMOVEABANDONED);        String removeAbandonedTimeout = cfgService().get(DBConstants.REMOVEABANDONEDTIMEOUT);        String logAbandoned = cfgService().get(DBConstants.LOGABANDONED);        try {            //<!-- 配置初始化大小、最小、最大 -->            druidDs.setInitialSize(Integer.parseInt(StringUtils.isEmpty(initialSize)?"1":initialSize));            druidDs.setMinIdle(Integer.parseInt(StringUtils.isEmpty(minIdle)?"1":minIdle));            druidDs.setMaxActive(Integer.parseInt(StringUtils.isEmpty(maxActive)?"20":maxActive));            //<!-- 配置获取连接等待超时的时间 -->            druidDs.setMaxWait(Long.parseLong(StringUtils.isEmpty(maxWait)?"60000":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 -->            druidDs.setTimeBetweenEvictionRunsMillis(Long.parseLong(StringUtils.isEmpty(timeBetweenEvictionRunsMillis)?"60000":timeBetweenEvictionRunsMillis));            //<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->            druidDs.setMinEvictableIdleTimeMillis(Long.parseLong(StringUtils.isEmpty(minEvictableIdleTimeMillis)?"300000":minEvictableIdleTimeMillis));            druidDs.setValidationQuery(StringUtils.isEmpty(validationQuery)?"select 'x'":validationQuery);            druidDs.setTestWhileIdle(Boolean.parseBoolean(StringUtils.isEmpty(testwhileIdle)?"true":testwhileIdle));            druidDs.setTestOnBorrow(Boolean.parseBoolean(StringUtils.isEmpty(testOnBorrow)?"false":testOnBorrow));            druidDs.setTestOnReturn(Boolean.parseBoolean(StringUtils.isEmpty(testOnReturn)?"false":testOnReturn));            //<!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->            druidDs.setPoolPreparedStatements(Boolean.parseBoolean(StringUtils.isEmpty(poolPreparedStatements)?"true":poolPreparedStatements));            druidDs.setMaxPoolPreparedStatementPerConnectionSize(Integer.parseInt(StringUtils.isEmpty(maxPoolPreparedStatementPerConnectionSize)?"20":maxPoolPreparedStatementPerConnectionSize));            //            druidDs.setRemoveAbandoned(Boolean.parseBoolean(StringUtils.isEmpty(removeAbandoned)?"true":removeAbandoned));            druidDs.setRemoveAbandonedTimeout(Integer.parseInt(StringUtils.isEmpty(removeAbandonedTimeout)?"180":removeAbandonedTimeout));            druidDs.setLogAbandoned(Boolean.parseBoolean(StringUtils.isEmpty(logAbandoned)?"true":logAbandoned));            //<!-- 配置监控统计拦截的filters，去掉后监控界面sql无法统计 -->            druidDs.setFilters("stat,log4j");        } catch (SQLException e) {            LogUtils.warn("加载 druid数据源监控服务异常：" + e.getMessage(), e);        }        return druidDs;    }

(4) 访问验证

启动应用就可以访问：http://127.0.0.1:8080/druid

输入账号和密码：admin/123456 就可以访问了，如下图示：