How SpringBoot integrates Druid data sources

SprintBoot uses the HikariDataSource data source by default. This time it integrates a third-party data source Druid. It is an open source data source developed by Alibaba and is considered by many to be the best database connection pool in the Java language. Because Druid can provide a powerful set of monitoring and expansion capabilities.

By default, sprintboot uses hikaridatasource data source. This time, Druid, a third-party data source, is integrated. It is an open source data source developed by Alibaba, and many people consider it to be the best database connection pool in the Java language because Druid can provide a powerful set of monitoring and expansion functions.

1. When creating the SpringBoot project, add dependencies in pom.xml maven:

            <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
 
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
 
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
             <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
          
        </dependency>

Note: druid relies on the log4j log jar package, but SpringBoot uses slf4j logback by default. So just import the log4j jar package.

2. Add the corresponding configuration in application.yml (or aproperties):

# 
server:
  port: 80
 # 数据库连接信息
spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf8&useSSL=true&serverTimezone=GMT
    driver-class-name: com.mysql.cj.jdbc.Driver # com.mysql.jdbc.Driver
#   使用 Druid 数据源
    type: com.alibaba.druid.pool.DruidDataSource

3. Log4j.properties configuration file:

log4j.rootLogger = debug,stdout, D
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.Threshold = INFO
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p %m%n
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = ./log4j.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern=%d %p %m%n

4. Run the test method , view the data source

public class SpringbootdemoApplicationTests {
 
     @Autowired
    private JdbcTemplate jdbcTemplate;
    @Autowired
    private DataSource dataSource;
     
    @Test
    public void contextLoads() throws SQLException {
        System.out.println("dataSource==" + dataSource.getClass());
        Connection con = dataSource.getConnection();
        System.out.println("con==" + con);
         List<Map<String, Object>> maps = jdbcTemplate.queryForList("select * from user");
        System.out.println(maps);
    }
 
}

5, run the test method

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