29.Spring-boot中@ConfigurationProperties，@Value，@PropertySource

偏执的太偏执、 2022-05-23 11:09 170阅读 0赞

1.利用@ConfigurationProperties获取配置的值，@ConfigurationProperties是springboot提供的基于安全类型的配置放置。

**    application.properties**

spring.redis.host=127.0.0.1
    spring.redis.port=6379
    spring.redis.maxIdle=10
    spring.redis.maxActive=20

** RedisConfig.java**

@Configuration
    @ConfigurationProperties(prefix = "spring.redis")  //会在application,properties,查找spring.redis开头的配置
    
    public class RedisConfig {
    
    //必须有get set放入，否则值注入不进去
    
    //匹配   spring.redis.host
    
    public String host;
    
    //匹配   spring.redis.port
    
    public int port;
    
    public String getHost() {
      return host;
    }
    public void setHost(String host) {
       this.host = host;
    }
    public int getPort() {
       return port;
    }
    public void setPort(int port) {
       this.port = port;
    }

2.利用@Value获取值,在springboot中如果不配置@PropertySource(value="classpath:redis.properties")（配置文件路径），默认是从application.properties中获取值，你也可以配置额外的@PropertySource，如下

@PropertySource(value="classpath:redis.properties")
    //@PropertySource(value="file:/home/config/redis.properties")
    
    
    
    public class RedisConfig {
    
             //从application.properties从获取
    
    @Value("${spring.redis.host}") 
    public String host;
    
            //从application.properties从获取
    
    @Value("${spring.redis.port}")
    public int port;
    
            //从redis中获取.properties从获取
    
            @Value("${name}")
    public String name;
    
      }

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