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This article mainly explains "SpringBoot how to get the custom value in application.properties". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "SpringBoot how to get the custom value in application.properties".

Directory structure:

Pom file:

4.0.0 org.springframework.boot spring-boot-starter-parent 2.5.4 com.example i18nSpringbootDemo-1 0.0.1-SNAPSHOT i18nSpringbootDemo-1 Demo project for Spring Boot 11 Org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test Org.springframework.boot spring-boot-configuration-processor true org.springframework.boot spring-boot-starter-validation Org.springframework.boot spring-boot-maven-plugin war

Application.properties:

Test.user.id=12# can be written as test.user.user-name=zhangsantest.user.userName=zhansan#, test.user.user-password=XXXtest.user.userPassword=PWD123# or test.user.la-big-decimal=XXXtest.user.laBigDecimal=138.3test.user.maps.key1=V1test.user.maps.key2=123test.user.lists=a12,a13,sdftest.user.department.dep-code=dep001test.user.department.dep-name=depName001.

Department class:

Package com.example.demo.obj; public class Department {private String depCode; private String depName; / * * @ return depCode * / public String getDepCode () {return depCode DepCode * / public void setDepCode (String depCode) {this.depCode = depCode;} / * * @ return depName * / public String getDepName () {return depName DepName * / public void setDepName (String depName) {this.depName = depName;} @ Override public String toString () {return "Department [depCode=" + depCode + ", depName=" + depName + "];}

User class:

Package com.example.demo.obj; import java.math.BigDecimal;import java.util.List;import java.util.Map; import javax.validation.constraints.Email;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.stereotype.Component;import org.springframework.validation.annotation.Validated / * * Map each attribute value of the configuration file to this component: * ① @ ConfigurationProperties: tell SpringBoot to bind all the properties in this class to the relevant configuration in the configuration file * prefix = "test.user": map all the attributes prefixed under test.user in the configuration file one by one * only if this component is a component in the container can the @ ConfigurationProperties function be provided. So add @ Component * * ② @ Value ("${key}") to get the value from environment variables and configuration files * @ Value ("# {SpEl}") expression * * @ ConfigurationProperties and @ Value: * @ ConfigurationProperties supports loose syntax, JSR303 data validation, complex type encapsulation, SpEL * @ Value does not support SpEL, loose syntax, JSR303 data validation, complex type encapsulation We need to get a value in the configuration file in a certain business logic. We can use @ Value * if we write a javaBean to map to the configuration file, we directly use @ ConfigurationProperties * / @ Component@ConfigurationProperties (prefix = "test.user") @ Validatedpublic class User {/ / @ Value ("# {10x2}") private Integer id / / @ Email userName must enter a value in mailbox format, otherwise an error will be reported / / @ Value ("${test.user.userName}") private String userName; / / @ Value ("${test.user.userPassword}") private String userPassword; / / @ Value ("${test.user.laBigDecimal}") private BigDecimal laBigDecimal / / @ Value ("${test.user.maps}") X No error private Map maps; / / @ Value ("${test.user.lists}") private List lists; / / @ Value ("${test.user.department}") X No error private Department department / * * @ return id * / public Integer getId () {return id;} / * @ param id / public void setId (Integer id) {this.id = id } / * * @ return userName * / public String getUserName () {return userName;} / * @ param userName / public void setUserName (String userName) {this.userName = userName } / * * @ return userPassword * / public String getUserPassword () {return userPassword;} / * @ param userPassword / public void setUserPassword (String userPassword) {this.userPassword = userPassword } / * * @ return laBigDecimal * / public BigDecimal getLaBigDecimal () {return laBigDecimal;} / * @ param laBigDecimal / public void setLaBigDecimal (BigDecimal laBigDecimal) {this.laBigDecimal = laBigDecimal } / * * @ return maps * / public Map getMaps () {return maps;} / * @ param maps / public void setMaps (Map maps) {this.maps = maps } / * * @ return lists * / public List getLists () {return lists;} / * @ param lists / public void setLists (List lists) {this.lists = lists } / * * @ return department * / public Department getDepartment () {return department;} / * @ param department / public void setDepartment (Department department) {this.department = department @ Override public String toString () {return "User [id=" + id + ", userName=" + userName + ", userPassword=" + userPassword + ", laBigDecimal=" + laBigDecimal + ", maps=" + maps + ", lists=" + lists + ", department=" + department + "]";}}

I18nSpringbootDemo1Application class:

Package com.example.demo; import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication; / * Application launch class * * / @ SpringBootApplicationpublic class I18nSpringbootDemo1Application {public static void main (String [] args) {SpringApplication.run (I18nSpringbootDemo1Application.class, args);}}

Unit test class I18nSpringbootDemo1ApplicationTests:

Package com.example.demo; import org.junit.jupiter.api.Test;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest; import com.example.demo.obj.User; @ SpringBootTestclass I18nSpringbootDemo1ApplicationTests {@ Autowired User user; @ Test void contextLoads () {System.out.println (user.toString ());}}

Start:

Results:

User [id=12, userName=zhansan, userPassword=PWD123, laBigDecimal=138.3, maps= {key1=V1, key2=123}, lists= [a12, a13, sdf], department=Department [depCode=dep001, depName=depName001]]

Thank you for reading, the above is the content of "SpringBoot how to get the custom value in application.properties". After the study of this article, I believe you have a deeper understanding of how SpringBoot obtains the custom value in application.properties, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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