动态管理配置文件扩展接口EnvironmentPostProcessor
SpringBoot支持動(dòng)態(tài)的讀取文件,留下的擴(kuò)展接口org.springframework.boot.env.EnvironmentPostProcessor。這個(gè)接口是spring包下的,使用這個(gè)進(jìn)行配置文件的集中管理,而不需要每個(gè)項(xiàng)目都去配置配置文件。這種方法也是springboot框架留下的一個(gè)擴(kuò)展(可以自己去擴(kuò)展)
demo
在/Users/naeshihiroshi/study/studySummarize/SpringBoot/(自己測(cè)試也可以隨機(jī)在一個(gè)目錄下建立一文件),目錄下建立一個(gè)名為springboot.properties文件,
springboot.properties中定義一些配置,配置如下:
jdbc.root.user=zhihao.miao jdbc.root.password=242312321定義MyEnvironmentPostProcessor實(shí)現(xiàn)EnvironmentPostProcessor接口
@Component public class MyEnvironmentPostProcessor implements EnvironmentPostProcessor {@Overridepublic void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {try{InputStream inputStream = new FileInputStream("/Users/naeshihiroshi/study/studySummarize/SpringBoot/springboot.properties");Properties properties = new Properties();properties.load(inputStream);PropertiesPropertySource propertiesPropertySource = new PropertiesPropertySource("my",properties);environment.getPropertySources().addLast(propertiesPropertySource);}catch (IOException e){e.printStackTrace();}} }在classpath定義一個(gè)META-INF文件夾然后在其下面先建spring.factories文件,在其中指定:
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org.springframework.boot.env.EnvironmentPostProcessor=com.zhihao.miao.processor.MyEnvironmentPostProcessor‘啟動(dòng)類測(cè)試:
@SpringBootApplication public class Application {public static void main(String[] args) {ConfigurableApplicationContext context = SpringApplication.run(Application.class,args);String username = context.getEnvironment().getProperty("jdbc.root.user");String password = context.getEnvironment().getProperty("jdbc.root.password");System.out.println("username==="+username);System.out.println("password==="+password);context.close();} }打印結(jié)果:
username===zhihao.miao password===242312321EnvironmentPostProcessor接口官網(wǎng)說明
官方文檔如下
Allows for customization of the application's {@link Environment} prior to the application context being refreshed.
允許定制應(yīng)用的上下文的應(yīng)用環(huán)境優(yōu)于應(yīng)用的上下文之前被刷新。(意思就是在spring上下文構(gòu)建之前可以設(shè)置一些系統(tǒng)配置)
EnvironmentPostProcessor implementations have to be registered in
META-INF/spring.factories, using the fully qualified name of this class as the key.
EnvironmentPostProcessor的實(shí)現(xiàn)類必須要在META-INF/spring.factories文件中去注冊(cè),并且注冊(cè)的是全類名。
EnvironmentPostProcessor processors are encouraged to detect whether Spring's
org.springframework.core.Ordered Ordered interface has been implemented or if the @org.springframework.core.annotation.Order Order annotation is present and to sort instances accordingly if so prior to invocation.
鼓勵(lì)EnvironmentPostProcessor處理器檢測(cè)Org.springframework.core.Ordered注解,這樣相應(yīng)的實(shí)例也會(huì)按照@Order注解的順序去被調(diào)用。
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作者:二月_春風(fēng)
鏈接:https://www.jianshu.com/p/be6c818fe6ff
來源:簡(jiǎn)書
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