关于druid连接池的使用详解_Java

druid连接池的使用

最好用的jdbc连接池莫过于druid

druid第一种连接方式

druiddatasource dds = new druiddatasource();
    
        try {
            dds.seturl("jdbc:mysql://localhost:3306/");
            dds.setusername("root");
            dds.setpassword("admin");
            dds.setdriverclassname("com.mysql.cj.jdbc.driver");
            system.out.println(dds.getconnection());
        } catch (sqlexception e) {
            e.printstacktrace();
        }

第二种连接方式：使用配置文件

druiddatasource dds = new druiddatasource();
        properties p = new properties();
        //加载提前写好的配置文件
        inputstream is = thread.currentthread().getcontextclassloader().getresourceasstream("db.properties");
        try {
            p.load(is);
            //druid加载文件内容
            dds.setconnectproperties(p);
            system.out.println(dds.getconnection());
        } catch (ioexception e) {
            e.printstacktrace();
        } catch (sqlexception e) {
            e.printstacktrace();
        }

配置文件内容：

#必须按这个配置名填写druid.
druid.url=jdbc:mysql://localhost:3306/db1
druid.username=root
druid.password=admin
druid.driverclassname=com.mysql.cj.jdbc.driver
#初始化创建连接数
druid.initialsize=2
#最大连接数
druid.maxactive=8
#启用数据监控监控
druid.filters=stat config

连接方式说完之后开始web监控

启用之前要开启监控，如配置文件最后一行

然后配置web.xml过滤器

<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
         xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
<!-- 过滤器 -->
    <filter>
        <filter-name>druidwebstatfilter</filter-name>
        <filter-class>com.alibaba.druid.support.http.webstatfilter</filter-class>
        <init-param>
            <param-name>exclusions</param-name>
            <param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>druidwebstatfilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <servlet>
        <servlet-name>druidstatview</servlet-name>
        <servlet-class>com.alibaba.druid.support.http.statviewservlet</servlet-class>
        <init-param>
            <!-- 允许清空统计数据 -->
            <param-name>resetenable</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <!-- 用户名 -->
            <param-name>loginusername</param-name>
            <param-value>admin</param-value>
        </init-param>
        <init-param>
            <!-- 密码 -->
            <param-name>loginpassword</param-name>
            <param-value>123</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>druidstatview</servlet-name>
        <url-pattern>/druid/*</url-pattern>
    </servlet-mapping>


</web-app>

然后开启服务器