1.
@Configuration @PropertySource("classpath:jdbc.properties") public class JdbcConfiguration { @Value("${jdbc.url}") String url; @Value("${jdbc.driverClassName}") String driverClassName; @Value("${jdbc.username}") String username; @Value("${jdbc.password}") String password; @Bean public DataSource dataSource() { DruidDataSource dataSource = new DruidDataSource(); dataSource.setUrl(url); dataSource.setDriverClassName(driverClassName); dataSource.setUsername(username); dataSource.setPassword(password); return dataSource; } }
2. 通过@ConfigurationProperties注解声明当前类为属性读取类
@ConfigurationProperties(prefix = "jdbc") public class JdbcProperties { private String url; private String driverClassName; private String username; private String password; }
@Configuration @EnableConfigurationProperties(JdbcProperties.class) public class JdbcConfiguration { @Autowired private JdbcProperties jdbcProperties; @Bean public DataSource dataSource() { DruidDataSource dataSource = new DruidDataSource(); dataSource.setUrl(jdbcProperties.getUrl()); dataSource.setDriverClassName(jdbcProperties.getDriverClassName()); dataSource.setUsername(jdbcProperties.getUsername()); dataSource.setPassword(jdbcProperties.getPassword()); return dataSource; } }
构造函数注入
@Configuration @EnableConfigurationProperties(JdbcProperties.class) public class JdbcConfiguration { private JdbcProperties jdbcProperties; public JdbcConfiguration(JdbcProperties jdbcProperties){ this.jdbcProperties = jdbcProperties; } @Bean public DataSource dataSource() { // 略 } }
@Configuration @EnableConfigurationProperties(JdbcProperties.class) public class JdbcConfiguration { @Bean public DataSource dataSource(JdbcProperties jdbcProperties) { // ... } }
3
@Configuration public class JdbcConfiguration { @Bean // 声明要注入的属性前缀,SpringBoot会自动把相关属性通过set方法注入到DataSource中 @ConfigurationProperties(prefix = "jdbc") public DataSource dataSource() { DruidDataSource dataSource = new DruidDataSource(); return dataSource; } }