目录结构：
pom文件：
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.5.4</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>i18nSpringbootDemo-1</artifactId> <version>0.0.1-SNAPSHOT</version> <name>i18nSpringbootDemo-1</name> <description>Demo project for Spring Boot</description> <properties> <java.version>11</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- 导入配置文件处理器，配置文件进行绑定就会提示 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-configuration-processor</artifactId> <optional>true</optional> </dependency> <!--校验依赖--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-validation</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> <packaging>war</packaging> </project>
application.properties：
test.user.id=12 #也可以写成 test.user.user-name=zhangsan test.user.userName=zhansan #也可以写成 test.user.user-password=XXX test.user.userPassword=PWD123 #也可以写成 test.user.la-big-decimal=XXX test.user.laBigDecimal=138.3 test.user.maps.key1=V1 test.user.maps.key2=123 test.user.lists=a12,a13,sdf test.user.department.dep-code=dep001 test.user.department.dep-name=depName001
Department类：
package com.example.demo.obj;
public class Department {
private String depCode;
private String depName;
/**
* @return depCode
*/
public String getDepCode() {
return depCode;
}
/**
* @param depCode セットする depCode
*/
public void setDepCode(String depCode) {
this.depCode = depCode;
}
/**
* @return depName
*/
public String getDepName() {
return depName;
}
/**
* @param depName セットする depName
*/
public void setDepName(String depName) {
this.depName = depName;
}
@Override
public String toString() {
return "Department [depCode=" + depCode + ", depName=" + depName + "]";
}
}
User类：
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;
/*
* 将配置文件的每一个属性值，映射到这个组件中:
* ①@ConfigurationProperties：告诉SpringBoot将本类中的所有属性和配置文件中相关的配置进行绑定；
* prefix = "test.user"：将配置文件中前缀为test.user下面的所有属性进行一一映射
* 只有这个组件是容器中的组件，才能提供@ConfigurationProperties的功能，所以要加@Component
*
* ②@Value("${key}")从环境变量、配置文件中获取值
* @Value("#{SpEl}")表达式
*
* @ConfigurationProperties与@Value的区别：
* @ConfigurationProperties支持松散语法，JSR303数据校验，复杂类型封装，不支持SpEL
* @Value支持SpEL，不支持松散语法，JSR303数据校验，复杂类型封装
* 如果说，我们在某个业务逻辑中需要获取一下配置文件中的某项值，可以用@Value
* 如果说，我们专门编写了一个javaBean去和配置文件进行映射，我们直接使用@ConfigurationProperties
*/
@Component
@ConfigurationProperties(prefix = "test.user")
@Validated
public class User {
//@Value("#{10*2}")
private Integer id;
//@Email userName必须输入邮箱格式的值，要不然报错
//@Value("${test.user.userName}")
private String userName;
//@Value("${test.user.userPassword}")
private String userPassword;
//@Value("${test.user.laBigDecimal}")
private BigDecimal laBigDecimal;
//@Value("${test.user.maps}") X 不行会报错
private Map<String, Object> maps;
//@Value("${test.user.lists}")
private List<Object> lists;
//@Value("${test.user.department}") X 不行会报错
private Department department;
/**
* @return id
*/
public Integer getId() {
return id;
}
/**
* @param id セットする id
*/
public void setId(Integer id) {
this.id = id;
}
/**
* @return userName
*/
public String getUserName() {
return userName;
}
/**
* @param userName セットする userName
*/
public void setUserName(String userName) {
this.userName = userName;
}
/**
* @return userPassword
*/
public String getUserPassword() {
return userPassword;
}
/**
* @param userPassword セットする userPassword
*/
public void setUserPassword(String userPassword) {
this.userPassword = userPassword;
}
/**
* @return laBigDecimal
*/
public BigDecimal getLaBigDecimal() {
return laBigDecimal;
}
/**
* @param laBigDecimal セットする laBigDecimal
*/
public void setLaBigDecimal(BigDecimal laBigDecimal) {
this.laBigDecimal = laBigDecimal;
}
/**
* @return maps
*/
public Map<String, Object> getMaps() {
return maps;
}
/**
* @param maps セットする maps
*/
public void setMaps(Map<String, Object> maps) {
this.maps = maps;
}
/**
* @return lists
*/
public List<Object> getLists() {
return lists;
}
/**
* @param lists セットする lists
*/
public void setLists(List<Object> lists) {
this.lists = lists;
}
/**
* @return department
*/
public Department getDepartment() {
return department;
}
/**
* @param department セットする 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类：
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* 应用启动类
*
*/
@SpringBootApplication
public class I18nSpringbootDemo1Application {
public static void main(String[] args) {
SpringApplication.run(I18nSpringbootDemo1Application.class, args);
}
}
单元测试类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;
@SpringBootTest
class I18nSpringbootDemo1ApplicationTests {
@Autowired
User user;
@Test
void contextLoads() {
System.out.println(user.toString());
}
}
启动：
结果：
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]]
