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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ### 實際應用 1. common-logging:apache最早提供的日志的門面接口。只有接口,沒有實現。具體方案由各提供商實現, 發現日志提供商是通過掃描 `META-INF/services/org.apache.commons.logging.LogFactory`配置文件,通過讀取該文件的內容找到日志提工商實現類。只要我們的日志實現里包含了這個文件,并在文件里制定`LogFactory`工廠接口的實現類即可; 2. JDBC:jdbc4.0以前, 開發人員還需要基于`Class.forName("xxx")`的方式來裝載驅動,jdbc4也基于spi的機制來發現驅動提供商了,可以通過`META-INF/services/java.sql.Driver`文件里指定實現類的方式來暴露驅動提供者
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