Advanced applications of propeties configuration for springboot
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")
