file:./config/   ==> 項目路徑下的config目錄下
file:./       ==> 項目路徑下
classpath:/config/ ==> 資源路徑下的config目錄下
classpath:/     ==> 項目路徑下

server:
 port: 8081
spring:
 profiles: dev
 
---
server:
 port: 8082
spring:
 profiles: test

@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
  @Bean
  public ViewResolver myViewResolver(){
    return new MyViewResolver();
  }
  
  public static class MyViewResolver implements ViewResolver { 
    @Override
    public View resolveViewName(String viewNaem, Locale locale) throws Exception {
      return null;
      
    }
  }
}

<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.21</version>
</dependency>

spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/springboot?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource # 自定義數(shù)據(jù)源

@Test
public void druidTest() throws SQLException {
    //查看默認數(shù)據(jù)源
    System.out.println(dataSource.getClass());

    //獲得數(shù)據(jù)庫連接
    Connection connection = dataSource.getConnection();
    System.out.println(connection);

    //close
    connection.close();

}

#Spring Boot 默認是不注入這些屬性值的，需要自己綁定
#druid 數(shù)據(jù)源專有配置
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true

#配置監(jiān)控統(tǒng)計攔截的filters，stat:監(jiān)控統(tǒng)計、log4j：日志記錄、wall：防御sql注入
#如果允許時報錯  java.lang.ClassNotFoundException: org.apache.log4j.Priority
#則導入 log4j 依賴即可，Maven 地址：https://mvnrepository.com/artifact/log4j/log4j
filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

@Configuration
public class DruidConfig {

    /*
       將自定義的 Druid數(shù)據(jù)源添加到容器中，不再讓 Spring Boot 自動創(chuàng)建
       綁定全局配置文件中的 druid 數(shù)據(jù)源屬性到 com.alibaba.druid.pool.DruidDataSource從而讓它們生效
       @ConfigurationProperties(prefix = "spring.datasource")：作用就是將 全局配置文件中
       前綴為 spring.datasource的屬性值注入到 com.alibaba.druid.pool.DruidDataSource 的同名參數(shù)中
     */
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }

}

@Test
public void druidTest() throws SQLException {
    //查看默認數(shù)據(jù)源
    System.out.println(dataSource.getClass());

    //獲得數(shù)據(jù)庫連接
    Connection connection = dataSource.getConnection();
    System.out.println(connection);

    //close
    connection.close();

    DruidDataSource druidDataSource = (DruidDataSource) dataSource;
    System.out.println("druidDataSource 數(shù)據(jù)源最大連接數(shù)：" + druidDataSource.getMaxActive());
    System.out.println("druidDataSource 數(shù)據(jù)源初始化連接數(shù)：" + druidDataSource.getInitialSize());

}

package com.zh1z3ven.hellospringboot.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;

@Configuration
public class DruidConfig {

    /*
       將自定義的 Druid數(shù)據(jù)源添加到容器中，不再讓 Spring Boot 自動創(chuàng)建
       綁定全局配置文件中的 druid 數(shù)據(jù)源屬性到 com.alibaba.druid.pool.DruidDataSource從而讓它們生效
       @ConfigurationProperties(prefix = "spring.datasource")：作用就是將 全局配置文件中
       前綴為 spring.datasource的屬性值注入到 com.alibaba.druid.pool.DruidDataSource 的同名參數(shù)中
     */
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }

    //配置 Druid 監(jiān)控管理后臺的Servlet；
    //內(nèi)置 Servlet 容器時沒有web.xml文件，所以使用 Spring Boot 的注冊 Servlet 方式
    @Bean
    public ServletRegistrationBean statViewServlet() {
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");

        // 這些參數(shù)可以在 com.alibaba.druid.support.http.StatViewServlet
        // 的父類 com.alibaba.druid.support.http.ResourceServlet 中找到
        Map<String, String> initParams = new HashMap<>();
        initParams.put("loginUsername", "admin"); //后臺管理界面的登錄賬號
        initParams.put("loginPassword", "123456"); //后臺管理界面的登錄密碼

        //后臺允許誰可以訪問
        //initParams.put("allow", "localhost")：表示只有本機可以訪問
        //initParams.put("allow", "")：為空或者為null時，表示允許所有訪問
        initParams.put("allow", "");
        //deny：Druid 后臺拒絕誰訪問
        //initParams.put("kuangshen", "192.168.1.20");表示禁止此ip訪問

        //設置初始化參數(shù)
        bean.setInitParameters(initParams);
        return bean;
    }

}

//配置 Druid 監(jiān)控 之  web 監(jiān)控的 filter
//WebStatFilter：用于配置Web和Druid數(shù)據(jù)源之間的管理關聯(lián)監(jiān)控統(tǒng)計
@Bean
public FilterRegistrationBean webStatFilter() {
    FilterRegistrationBean bean = new FilterRegistrationBean();
    bean.setFilter(new WebStatFilter());

    //exclusions：設置哪些請求進行過濾排除掉，從而不進行統(tǒng)計
    Map<String, String> initParams = new HashMap<>();
    initParams.put("exclusions", "*.js,*.css,/druid/*,/jdbc/*");
    bean.setInitParameters(initParams);

    //"/*" 表示過濾所有請求
    bean.setUrlPatterns(Arrays.asList("/*"));
    return bean;
}