<!-- jdbcTemplate -->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- druid數據庫連接池 -->
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>1.0.26</version>
</dependency>
<!-- mysql connector -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <scope>runtime</scope>
</dependency>

druid.properties
#數據庫設置
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/uu_core?useUnicode=true&characterEncoding=utf8&autoReconnect=true&useSSL=true
spring.datasource.username=root
spring.datasource.password=root
#--------------------------
# 下面為連接池的補充設置，應用到上面所有數據源中
# 初始化大小，最小，最大
spring.datasource.initialSize=5
spring.datasource.minIdle=1
spring.datasource.maxActive=50
# 配置獲取連接等待超時的時間
spring.datasource.maxWait=60000
# 配置間隔多久才進行一次檢測，檢測需要關閉的空閑連接，單位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一個連接在池中最小生存的時間，單位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打開PSCache，并且指定每個連接上PSCache的大小
spring.datasource.poolPreparedStatements=false
#spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置監控統計攔截的filters，去掉后監控界面sql無法統計，'wall'用于防火墻
spring.datasource.filters=stat,wall,log4j
# 通過connectProperties屬性來打開mergeSql功能；慢SQL記錄
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多個DruidDataSource的監控數據
#spring.datasource.useGlobalDataSourceStat=true

package cn.aduu.config;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import javax.sql.DataSource;
/**
 * @author zh
 * @ClassName cn.aduu.config.DruidConfiguration
 * @Description
 */
@Configuration
@PropertySource(value = "classpath:druid.properties")
public class DruidConfiguration {
  @Bean(destroyMethod = "close", initMethod = "init")
  @ConfigurationProperties(prefix = "spring.datasource")
  public DataSource druidDataSource() {
    DruidDataSource druidDataSource = new DruidDataSource();
    return druidDataSource;
  }
  /**
   * 注冊一個StatViewServlet
   * @return
   */
  @Bean
  public ServletRegistrationBean druidStatViewServlet(){
    //org.springframework.boot.context.embedded.ServletRegistrationBean提供類的進行注冊.
    ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");
    //添加初始化參數：initParams
    //白名單：
    servletRegistrationBean.addInitParameter("allow","127.0.0.1");
    //IP黑名單 (存在共同時，deny優先于allow) : 如果滿足deny的話提示:Sorry, you are not permitted to view this page.
    servletRegistrationBean.addInitParameter("deny","192.168.1.73");
    //登錄查看信息的賬號密碼.
    servletRegistrationBean.addInitParameter("loginUsername","admin");
    servletRegistrationBean.addInitParameter("loginPassword","123456");
    //是否能夠重置數據.
    servletRegistrationBean.addInitParameter("resetEnable","false");
    return servletRegistrationBean;
  }
  /**
   * 注冊一個：filterRegistrationBean
   * @return
   */
  @Bean
  public FilterRegistrationBean druidStatFilter(){
    FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
    //添加過濾規則.
    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;
  }
}

@RestController
public class HelloController{
  private static final Logger logger = LoggerFactory.getLogger(HelloController.class);
  @Autowired
  private JdbcTemplate jdbcTemplate;
  @RequestMapping("hello")
  public List<Map<String, Object>> hello() {
    List<Map<String, Object>> list = jdbcTemplate.queryForList("SELECT user,password FROM mysql.user ", new Object[]{});
    return list;
  }
}

[
  {
    "user": "root",
    "password": "*81F5E21E35407D884A6CD4A731AEBFB6AF209E1B"
  },
  {
    "user": "root",
    "password": "*81F5E21E35407D884A6CD4A731AEBFB6AF209E1B"
  }
]