<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
</dependency>

二、定义工具类

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.yaml.snakeyaml.Yaml;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Map;
 * @author xxx
 * @since 2023/1/6 21:38
public class PropertiesUtils {
     * 读取yml文件,解析成JSONObject对象
     * @param file yml文件
     * @return JSONObject对象
    public static JSONObject ymlToJsonObject(File file) {
        JSONObject jsonObject = new JSONObject();
        Map<String, Object> propertiesMap = null;
        try {
            FileInputStream fileInputStream = new FileInputStream(file);
            Yaml yaml = new Yaml();
            propertiesMap = yaml.load(fileInputStream);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        jsonObject.putAll(propertiesMap);
        return jsonObject;

三、启动项目

demo:
  user:
    name: xiaoming

随便写个类,保证能被Spring自动加载就行

import com.alibaba.fastjson.JSONObject;
import myDemo.utils.PropertiesUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import java.io.File;
import java.util.HashMap;
 * @author xxx
 * @since 2023/1/6 23:03
@Component
public class DemoConfig {
    @Value("${demo.user.name}")
    private String userName;
    static {
        File file = new File("src/main/resources/bootstrap.yml");
        JSONObject jsonObject = PropertiesUtils.ymlToJsonObject(file);
        HashMap<String, Object> demoMap = (HashMap<String, Object>) jsonObject.get("demo");
        jsonObject.putAll(demoMap);
        HashMap<String, Object> userMap = (HashMap<String, Object>) jsonObject.get("user");
        jsonObject.putAll(userMap);
        String name = jsonObject.get("name").toString();
        System.out.println("name = " + name);

启动后结果如下,通过注入(注入方式获取值不演示了)或非注入方式,均可取到配置文件的值

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::               (v2.5.14)
2023-01-06 23:04:31.888  INFO 16928 --- [           main] myDemo.DemoApplication                   : No active profile set, falling back to 1 default profile: "default"
2023-01-06 23:04:32.172  INFO 16928 --- [           main] o.s.cloud.context.scope.GenericScope     : BeanFactory id=ea23a3d1-12cd-3af4-9164-1f94c57f84d1
2023-01-06 23:04:32.297  INFO 16928 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2023-01-06 23:04:32.297  INFO 16928 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-01-06 23:04:32.297  INFO 16928 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.63]
2023-01-06 23:04:32.377  INFO 16928 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-01-06 23:04:32.377  INFO 16928 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 489 ms
name = xiaoming
2023-01-06 23:04:32.787  INFO 16928 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2023-01-06 23:04:32.945  INFO 16928 --- [           main] myDemo.DemoApplication                   : Started DemoApplication in 1.946 seconds (JVM running for 2.466)
<dependency>
  <groupId>com.fasterxml.jackson.dataformat</groupId>
  <artifactId>jackson-dataformat-yaml</artifactId>
  <versi...
<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-yaml</artifactId>
    <version>2.13.3</version>
</depe
				
spring boot 推荐使用 yaml 格式语言(yml=yaml)来编写配置文件,从而取代 xml 以及 properties,yaml 语言具有像 json 一样简洁明了的特点,但同时具有能够处理复杂类型数据、文本注释的特点,非常适合作为配置文件使用。 本文介绍一下在实际开发过程中关于 yaml 语言字符串换行的问题。