从application.properties Spring Boot读取值 [英] Reading values from application.properties Spring Boot

问题描述

My Spring启动应用程序具有以下应用程序结构：

My Spring boot app has this application structure:

• src
  
  
  
  
  • main
    
    
    
    
    • java
    
    
    • 资源
      
      
      
      
      • application.properties
      
      

      这是我的application.properties文件：

      This is my application.properties file:

      logging.level.org.springframework=TRACE
      logging.level.org.hibernate=ERROR
      spring.resources.chain.strategy.content.enabled=true
      spring.resources.chain.strategy.content.paths=/**
      #spring.resources.chain.cache=false
      #spring.resources.chain.html-application-cache=false
      #spring.headers.cache=false
      language=java
      

      我有一个类需要使用该language = java属性。这就是我尝试使用它的方式：

      I have a class which requires the use of that language=java property. This is how I am trying to use it:

      public class EntityManager {
      
          @Value("${language}")
          private static String newLang;
      
          public EntityManager(){
              System.out.println("langauge is: " + newLang);
          }
      }
      

      打印的值始终为null 出于某种原因！我也试过把它放在类声明之上：

      That printed value is always "null" for some reason! I have also tried putting this on top of the class declaration:

      @PropertySource(value = "classpath:application.properties")
      

      
      

      推荐答案

      可以通过多种方式实现，请参阅下文。

      It can be achieved in multiple ways, refer below.

      @Configuration
      @PropertySource("classpath:application.properties")
      public class EntityManager {
      
          @Value("${language}")
          private static String newLang;
      
          @Bean
          public static PropertySourcesPlaceholderConfigurer propertyConfigInDev() {
              return new PropertySourcesPlaceholderConfigurer();
          }
      
      }
      

      OR

      @Configuration
      @PropertySource("classpath:application.properties")
      public class EntityManager {
      
          @Autowired
          private Environment env;
      
          public void readProperty() {
              env.getProperty("language");
          }
      
      }
      

      这篇关于从application.properties Spring Boot读取值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！