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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