Spring Boot配置读取实现方法解析

@RestController
public class ConfigController {

  @Autowired
  private Environment env;

  /**
   * 通过配置的key获取value<br>
   * {key:.+}是为了解决通过url参数访问的时候小数点丢失的问题
   * @param key
   * @return
   */
  @RequestMapping("/config/{key:.+}")
  Object getConfig(@PathVariable String key) {
    return env.getProperty(key);
  }

}

@RestController
public class ConfigController {

  /**
   * 读取application.properties中的配置值
   */
  @Value("${server.context-path}")
  private String contextPath;

  @RequestMapping("/config/contextpath")
  Object getConfigContextPath() {
    return contextPath;
  }

}

@ConfigurationProperties(locations = "classpath:config.properties", prefix = "config")
@Component
public class Config {
  @NotEmpty
  private String ip;
  private int port;

  public String getIp() {
    return ip;
  }
  public void setIp(String ip) {
    this.ip = ip;
  }
  public int getPort() {
    return port;
  }
  public void setPort(int port) {
    this.port = port;
  }
}

@ConfigurationProperties(prefix = "spring.data.mongodb")
public class MongoProperties {
  /**
   * Default port used when the configured port is {@code null}.
   */
  public static final int DEFAULT_PORT = 27017;
  /**
   * Mongo server host.
   */
  private String host;
  /**
   * Mongo server port.
   */
  private Integer port = null;
  // ....
}

***************************
APPLICATION FAILED TO START
***************************
Description:
Binding to target com.cxytiandi.config.Config@2af616d3 failed:
  Property: config.ip
  Value: null
  Reason: 不能为空
Action:
Update your application's configuration
然后我们创建个config.properties放在classpath下

config.ip=192.168.1.1
config.port=8080
使用就直接注入Config类就行了

@RestController
public class ConfigController {

  @Autowired
  private Config config;

  @RequestMapping("/config")
  Object queryConfig() {
    return config;
  }
}