Spring\SpringBoot配置连接数据库的方法

jdbc.driverClassName=com.Mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/SSM
jdbc.username=root
jdbc.passWord=root

@Configuration//声明该类是一个java配置类，相当于一个xml配置文件
@PropertySource("classpath:jdbc.properties") //读取资源文件
public class JdbcConfiguration {
 
    @Value("${jdbc.driverClassName}")
    private String driverClassName;
 
    @Value("${jdbc.url}")
    private String url;
 
    @Value("${jdbc.username}")
    private String username;
 
    @Value("${jdbc.password}")
    private String password;
 
    @Bean //将返回值注入到ioc容器中
    public DataSource dataSource(){
        DruidDataSource dataSource=new DruidDataSource();
        //设置连接数据库的四大参数
        dataSource.setDriverClassName(this.driverClassName);
        dataSource.setUrl(this.url);
        dataSource.setUsername(this.username);
        dataSource.setPassword(this.password);
        return dataSource;
    }
 
}

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/SSM
jdbc.username=root
jdbc.password=root

@ConfigurationProperties(prefix = "jdbc")
public class JdbcProperties {
 
    private String driverClassName;
 
    private String url;
 
    private String username;
 
    private String password;
 
   public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }
 
    public void setUrl(String url) {
        this.url = url;
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    public String getDriverClassName() {
        return driverClassName;
    }
 
    public String getUrl() {
        return url;
    }
 
    public String getUsername() {
        return username;
    }
 
    public String getPassword() {
        return password;
    }
}

@Configuration//声明该类是一个java配置类，相当于一个西xml配置文件
@EnableConfigurationProperties(JdbcProperties.class) //加载JDBC的配置类
public class JdbcConfiguration {
 
 
    @Autowired
    private JdbcProperties jdbcProperties;
 
    //方式一
    @Bean //将返回值注入到IOC容器中
    public DataSource dataSource(){
        DruidDataSource dataSource=new DruidDataSource();
        //设置连接数据库的四大参数
        dataSource.setDriverClassName(this.jdbcProperties.getDriverClassName());
        dataSource.setUrl(this.jdbcProperties.getUrl());
        dataSource.setUsername(this.jdbcProperties.getUsername());
        dataSource.setPassword(this.jdbcProperties.getPassword());
        return dataSource;
    }
    
      
 
    
    
    
    
    
}