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

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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