Shulou(Shulou.com)06/03 Report--

One: the use of the EnvironmentPostProcessor interface, using this interface, you can load properties files dynamically (that is, according to business logic).

@ Component

Public class MyEnvironmentPostProcessor implements EnvironmentPostProcessor {

@ Override

Public void postProcessEnvironment (ConfigurableEnvironment environment, SpringApplication application) {

Try (InputStream inputStream = new FileInputStream ("E:/tmp/springboottest.properties")) {

Properties source = new Properties ()

Source.load (inputStream)

PropertiesPropertySource propertySource = new PropertiesPropertySource ("my", source)

Environment.getPropertySources () addLast (propertySource)

} catch (IOException e) {

E.printStackTrace ()

}

}

}

Then get the contents of the configuration file:

Public static void main (String [] args) {

ConfigurableApplicationContext context = SpringApplication.run (App.class, args)

Context.getBean (Runnable.class) .run ()

/ / String property = context.getEnvironment () .getProperty ("local.ip")

/ / System.out.println ("the parameter obtained is:" + property)

/ context.getBean (UserConfig.class) .show ()

/ context.getBean (Dbconfig.class) .show ()

/ context.getBean (DataSourceProperties.class) .show ()

System.out.println (context.getBean (TomcatProperties.class))

System.out.println (context.getEnvironment () .getProperty ("spring.boot.name")

Context.close ()

}

Springboot supports the configuration of arrays and collections

Package com.zcp.springstart

Import java.util.ArrayList

Import java.util.Arrays

Import java.util.List

Import org.springframework.boot.context.properties.ConfigurationProperties

Import org.springframework.stereotype.Component

/ * *

* support getting arrays and collections

* configuration method: name [index] = value

* how to write it in application.properties file:

* data.url=127.0.0.1

Data.port=1234

Data.name=123

Data.password=root.post

Ds.hosts [0] = 128.128.128.0

Ds.hosts [1] = 128.128.128.1

Ds.hosts [2] = 128.128.128.2

Ds.hosts [3] = 128.128.128.3

Ds.ports [0] = 8888

Ds.ports [1] = 8889

Ds.ports [2] = 8890

Ds.ports [3] = 8891

Ds.ports [4] = 8892

*

Title: TomcatProperties

*

Description:

*

Company: www.itcast.cn

* @ version 1.0

, /

@ Component

@ ConfigurationProperties ("ds")

Public class TomcatProperties {

Private List hosts = new ArrayList ()

Private String [] ports

Public String [] getPorts () {

Return ports

}

Public void setPorts (String [] ports) {

This.ports = ports

}

Public List getHosts () {

Return hosts

}

Public void setHosts (List hosts) {

This.hosts = hosts

}

@ Override

Public String toString () {

Return "TomcatProperties [hosts=" + hosts + ", ports=" + Arrays.toString (ports) + "]"

}

}

3: read application-*.properties configuration information

Package com.zcp.springstart

Import org.springframework.boot.SpringApplication

Import org.springframework.boot.autoconfigure.SpringBootApplication

Import org.springframework.context.ConfigurableApplicationContext

/ * method 1:

* start parameters to control the effective profile. Multiple profile can be activated simultaneously

*-- spring.profiles.active=dev,test

*

* method 2:

*

* SpringApplication springApplication = new SpringApplication (App2.class)

/ / springApplication.setAdditionalProfiles ("dev")

SpringApplication.setAdditionalProfiles ("dev", "test")

Description:

Application-dev.properties

Application-test.properties

The naming of

*

Title: App2

*

Description:

*

Company: www.itcast.cn

* @ version 1.0

, /

@ SpringBootApplication

Public class App2 {

Public static void main (String [] args) {

SpringApplication springApplication = new SpringApplication (App2.class)

/ / springApplication.setAdditionalProfiles ("dev")

SpringApplication.setAdditionalProfiles ("dev", "test")

ConfigurableApplicationContext context = springApplication.run (args)

System.out.println (">")

System.out.println (context.getEnvironment () .getProperty ("db123.url")

System.out.println (context.getEnvironment () .getProperty ("db123.url2")

System.out.println (">.")

Context.close ()

}

}

If it is a class or method, you can use it by annotating @ Profile ("test")

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