springboot项目数据库配置类DatabaseConfig示例详解

spring:
  datasource:
    name: text
    url: jdbc:mysql://192.168.11.50:3306/dsdd?characterEncoding=UTF-8&useUnicode=true&useSSL=false&tinyInt1isBit=false&allowPublicKeyRetrieval=true&serverTimezone=UTC
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver

package com.example.poi.utils;
/**
 * @Author xu
 * @create 2023/8/22 21
 */
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
@Configuration
public class DatabaseConfig {
    @Value("${spring.datasource.url}")
    private String dataSourceUrl;
    @Value("${spring.datasource.username}")
    private String dataSourceUsername;
    @Value("${spring.datasource.password}")
    private String dataSourcePassword;
    @Value("${spring.datasource.driver-class-name}")
    private String dataSourceDriverClassName;
    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setUrl(dataSourceUrl);
        dataSource.setUsername(dataSourceUsername);
        dataSource.setPassword(dataSourcePassword);
        dataSource.setDriverClassName(dataSourceDriverClassName);
        testConnection(dataSource); // 调用检查连接方法
        return dataSource;
    }
    private void testConnection(DataSource dataSource) {
        try (Connection connection = dataSource.getConnection()) {
            System.out.println("数据库连接正常！");
        } catch (SQLException e) {
            // 连接异常处理
            //e.printStackTrace();
            throw new RuntimeException("数据库连接异常！");
        }
    }
}

@SpringBootApplication
public class YourApplication {
    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(YourApplication.class, args);
        // 检查数据库连接是否正常
        try {
            /** 获取DataSource bean，并调用getConnection()方法测试连接*/
            context.getBean(javax.sql.DataSource.class).getConnection();
            System.out.println("数据库连接正常！");
        } catch (Exception e) {
            System.err.println("数据库连接异常：" + e.getMessage());
            // 处理连接异常的逻辑
        }
    }
}