Spring Boot2.0自定义配置文件使用

声明：

1. spring boot 1.5 以后，ConfigurationProperties取消locations属性，因此采用PropertySource注解配合使用
2. 根据Spring Boot2.0官方文档，PropertySource注解，只支持properties文件，因此排除 YAML配置
3. 针对二，可考虑新建配置类，自行搜索，不再此次讨论范围

 具体使用：

　　1.根目录下新建自定义配置文件夹与properties配置文件

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

　　2.创建配置文件对应的实体类

@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.注入，直接调用

    // 自定义配置文件对应配置类 注入
    @Autowired
    private ExampleConfig exampleConfig;
    @RequestMapping(value = "/hello",method = RequestMethod.GET)
    @ResponseBody
    public String sayHello(){
        return exampleConfig.getName() + "的老婆是"
                + exampleConfig.getWife() + ", 年龄" + exampleConfig.getAge()
                + "岁，梦想是" + exampleConfig.getDream();
    }

知识储备：

ConfigurationProperties源码：

@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;

}