21、整合Druid数据源

1）、引入外部的数据源（Druid）

<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->

<dependency>

    <groupId>com.alibaba</groupId>

    <artifactId>druid</artifactId>

    <version>1.1.</version>

</dependency>

2）、配置文件中切换默认的数据源

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/users?serverTimezone=GMT

spring.datasource.username=root

spring.datasource.password=

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

3）、配置其他属性

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/users?serverTimezone=GMT

spring.datasource.username=root

spring.datasource.password=

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

#其他配置

# 下面为连接池的补充设置，应用到上面所有数据源中

spring.datasource.initialSize=

spring.datasource.minIdle=

spring.datasource.maxActive=

# 配置获取连接等待超时的时间

spring.datasource.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

spring.datasource.timeBetweenEvictionRunsMillis=

# 配置一个连接在池中最小生存的时间，单位是毫秒

spring.datasource.minEvictableIdleTimeMillis=

spring.datasource.validationQuery=SELECT  FROM DUAL

spring.datasource.testWhileIdle=true

spring.datasource.testOnBorrow=false

spring.datasource.testOnReturn=false

# 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

spring.datasource.logSlowSql=true

4）、此时的配置并不能使用，需要将其加入容器

@Configuration

public class MyDruid {

    @ConfigurationProperties(prefix = "spring.datasource")

    @Bean

    public DataSource druid(){

        return  new DruidDataSource();

    }

}

Debug查看：

5）、配置监听

public class StatViewServlet extends ResourceServlet {

    private static final Log LOG = LogFactory.getLog(StatViewServlet.class);

    private static final long serialVersionUID = 1L;

    public static final String PARAM_NAME_RESET_ENABLE = "resetEnable";

    public static final String PARAM_NAME_JMX_URL = "jmxUrl";

    public static final String PARAM_NAME_JMX_USERNAME = "jmxUsername";

    public static final String PARAM_NAME_JMX_PASSWORD = "jmxPassword";

public abstract class ResourceServlet extends HttpServlet {

    private static final Log LOG = LogFactory.getLog(ResourceServlet.class);

    public static final String SESSION_USER_KEY = "druid-user";

    public static final String PARAM_NAME_USERNAME = "loginUsername";

    public static final String PARAM_NAME_PASSWORD = "loginPassword";

    public static final String PARAM_NAME_ALLOW = "allow";

    public static final String PARAM_NAME_DENY = "deny";

    public static final String PARAM_REMOTE_ADDR = "remoteAddress";

上面作为参考！！！！

@Configuration

public class MyDruid {

    @ConfigurationProperties(prefix = "spring.datasource")

    @Bean

    public DataSource druid(){

        return  new DruidDataSource();

    }

    //配置Druid的监控

    //1、配置一个管理后台的Servlet

    @Bean

    public ServletRegistrationBean statViewServlet(){

        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");

        Map<String,String> initParams = new HashMap<>();

        initParams.put("loginUsername","admin");

        initParams.put("loginPassword","");

        //允许访问，默认所有都可访问

        initParams.put("allow","");//默认就是允许所有访问

        //不让访问

        initParams.put("deny","192.168.15.21");

        //设置初始化参数

        bean.setInitParameters(initParams);

        return bean;

    }

    //2、配置一个web监控的filter

    @Bean

    public FilterRegistrationBean webStatFilter(){

        FilterRegistrationBean bean = new FilterRegistrationBean();

        bean.setFilter(new WebStatFilter());

        Map<String,String> initParams = new HashMap<>();

        //排除拦截的请求

        initParams.put("exclusions","*.js,*.css,/druid/*");

        //设置初始化参数

        bean.setInitParameters(initParams);

         //拦截的请求

        bean.setUrlPatterns(Arrays.asList("/*"));

        return  bean;

    }

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