Spring boot document Study Notes day02 and Study Notes day02

Spring boot document Study Notes day02 and Study Notes day02

1.Start to report an error. View debug

$ Java-jar myproject-0.0.1-SNAPSHOT.jar-debug

 

2.Custom banner

The banner that is printed on start up can be changed by addingbanner.txtFile to your classpath or by settingspring.banner.locationProperty to the location of such a file. If the file has an encoding other than UTF-8, you can setspring.banner.charset. In addition to a text file, you can also addbanner.gif,banner.jpg, Orbanner.pngImage file to your classpath or setspring.banner.image.locationProperty. Images are converted into an ASCII art representation and printed above any text banner.

 

3.Custom SpringApplication

public static void main(String[] args) {

        SpringApplication app = new SpringApplication(MySpringConfiguration.class);

        app.setBannerMode(Banner.Mode.OFF);

        app.run(args);

}

 4.Get running parameters

If you need to access the application arguments that were passedSpringApplication.run(…), You can injectorg.springframework.boot.ApplicationArgumentsBean.ApplicationArgumentsInterface provides access to both the rawString[]Arguments as well as parsedoptionAndnon-optionArguments, as shown in the following example:

import org.springframework.boot.*

import org.springframework.beans.factory.annotation.*

import org.springframework.stereotype.*

@Component

public class MyBean {

        @Autowired

        public MyBean(ApplicationArguments args) {

               boolean debug = args.containsOption("debug");

               List<String> files = args.getNonOptionArgs();

               // if run with "--debug logfile.txt" debug=true, files=["logfile.txt"]

        }

}

5.Read order of application. properties

SpringApplication loads properties from application. properties files in the following locations and adds them to the Spring Environment:

1. A/config subdirectory of the current directory
2. The current directory
3. A classpath/config package
4. The classpath root

The list is ordered by precedence (properties defined in locations higher in the list override those defined in lower locations ).

 

6.Specify the configuration file name and location

The following example shows how to specify a different file name:

$ Java-jar myproject. jar -- spring. config. name = myproject

The following example shows how to specify two locations:

$ Java-jar myproject. jar -- spring. config. location = classpath:/default. properties, classpath:/override. properties

 

7. @ ConfigurationPropertie loose multiple bindings. It is recommended to use lowercase + hyphen in properties.

Public class OwnerProperties {

 

PrivateString firstName;

 

PublicString getFirstName (){

Returnthis. firstName;

}

 

Public voidsetFirstName (String firstName ){

This. firstName = firstName;

}

 

}

In thepreceding example, the following properties names can all be used:

Acme. my-project.person.firstName	Standard camel case syntax.
Acme. my-project.person.first-name	Kebab case, which is recommended for use in. properties and. yml files.
Acme. my-project.person.first_name	Underscore notation, which is an alternative format for use in. properties and. yml files.
ACME_MYPROJECT_PERSON_FIRSTNAME	Upper case format, which is recommended when using system environment variables.

TheprefixValuefor the annotationMustBe in kebab case (lowercase and separated-, Suchacme.my-project.person).

 

8.Profiles

SpringProfiles provide a way to segregate parts of your application configuration andmake it be available only in certain environments. Any@ComponentOr@ConfigurationCan be marked@ProfileTo limit when it is loaded

You can use a spring.profiles.active Environment property to specify which profiles are active：spring.profiles.active=dev,hsqldb