聲明：

1. spring boot 1.5 以後，ConfigurationProperties取消locations屬性，因此采用PropertySource註解配合使用
2. 根據Spring Boot2.0官方文檔，PropertySource註解，只支持properties文件，因此排除 YAML配置
3. 針對二，可考慮新建配置類，自行搜索，不再此次討論範圍

具體使用：

　　1.根目錄下新建自定義配置文件夾與properties配置文件

example.name=tom
example.wife=jerry
example.age=25
example.dream=top

　　2.創建配置文件對應的實體類

@ConfigurationProperties(prefix = "example")
@PropertySource(value = "classpath:config/config-test.properties")
@Component
public class ExampleConfig {
    private String name;
    private String wife;
    private String age;
    private String dream;

    get ... set
}

　　3.註入，直接調用

    // 自定義配置文件對應配置類 註入
 

    @Autowired
    private ExampleConfig exampleConfig;
    @RequestMapping(value = "/hello",method = RequestMethod.GET)
    @ResponseBody
    public String sayHello(){
        return exampleConfig.getName() + "的老婆是"
                + exampleConfig.getWife() + ", 年齡" + exampleConfig.getAge()
                
 
+ "歲，夢想是" + exampleConfig.getDream();
    }

知識儲備：

ConfigurationProperties源碼：

@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ConfigurationProperties {

    /**
     * The name prefix of the properties that are valid to bind to this object. Synonym
     * for {@link #prefix()}.
     * @return the name prefix of the properties to bind
     */
    @AliasFor("prefix")
    String value() default "";

    /**
     * The name prefix of the properties that are valid to bind to this object. Synonym
     * for {@link #value()}.
     * @return the name prefix of the properties to bind
     */
    @AliasFor("value")
    String prefix() default "";

    boolean ignoreInvalidFields() default false;

    boolean ignoreUnknownFields() default true;

}

Spring Boot2.0自定義配置文件使用