Spring boot 的 properties 属性值配置 application.properties 与 自定义properties

1. 配置属性值
   application.properties 文件直接配置：

   com.ieen.super.name="MDD"

   自定义properties文件配置：src/main/resources/conf/boot.properties

   com.ieen.boot.name="123"
   com.ieen.boot.value="456"

2. 调用方法
   @Value 注解调用application.properties属性值:

   @Value("${com.ieen.super.name}")
   private String name;

   @Value注解调用自定义properties属性值:

   @PropertySource("classpath:conf/boot.properties")
   public class Main{
       @Value("${com.ieen.boot.name}")
       private String bootName;
   }

   注：@PropertySource 注解引入自定义properties从1.5以后才开始的

   // value 为自定义配置
   // ignoreResourceNotFound 默认false，文件不存在报错
   // encoding 设置编码
   // name 为Resource对象的beanname
   @PropertySource(value = { "classpath:boot.properties",
           "classpath:conf/boot.properties" }, ignoreResourceNotFound = false, encoding = "UTF-8", name = "boot-custom.properties")

   @ConfigurationProperties 配置properties属性对象：

   // spring boot 1.5以前的配置
   //@ConfigurationProperties(prefix = "com.ieen.boot",locations = "classpath:conf/boot.properties")
   @ConfigurationProperties(prefix = "com.ieen.boot")
   // 若是自定义properties则加上
   @PropertySource(value = "classpath:conf/boot.properties", encoding = "UTF-8")
   @Component
   public class BootPropertiesBean {
       private String name;
       private String value;
       public String getName() {
           return name;
       }
       public void setName(String name) {
           this.name = name;
       }
       public String getValue() {
           return value;
       }
       public void setValue(String value) {
           this.value = value;
       }
   }

       @Autowired
       private BootPropertiesBean bean;