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                ### 74.1 配置數據源 自定義`DataSource`類型的`@Bean`可以覆蓋默認設置,正如[Section 24.7.1, “Third-party configuration”](333032)解釋的那樣,你可以很輕松的將它跟一系列`Environment`屬性綁定: ```java @Bean @ConfigurationProperties(prefix="datasource.fancy") public DataSource dataSource() { return new FancyDataSource(); } ``` ```properties datasource.fancy.jdbcUrl=jdbc:h2:mem:mydb datasource.fancy.username=sa datasource.fancy.poolSize=30 ``` Spring Boot也提供了一個工具類`DataSourceBuilder`用來創建標準的數據源。如果需要重用`DataSourceProperties`的配置,你可以從它初始化一個`DataSourceBuilder`: ```java @Bean @ConfigurationProperties(prefix="datasource.mine") public DataSource dataSource(DataSourceProperties properties) { return properties.initializeDataSourceBuilder() // additional customizations .build(); } ``` 在此場景中,你保留了通過Spring Boot暴露的標準屬性,通過添加`@ConfigurationProperties`,你可以暴露在相應的命命名空間暴露其他特定實現的配置, 具體詳情可參考'Spring Boot特性'章節中的[Section 29.1, “Configure a DataSource”](333080)和[DataSourceAutoConfiguration](https://github.com/spring-projects/spring-boot/tree/v1.4.1.RELEASE/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration.java)類源碼。
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