SpringBoot中读取application.properties配置文件的方法

application.properties有以下这几条数据

方法一：@Value注解+@Component

建议properties少的时候用，多的时候就不要使用这种方法了

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class UserController {
   @Value("${wx.open.app_id}")
   private String appid;
   @Value("${wx.open.app_secret}")
   private String secret;
   @Value("${wx.open.redirect_url}")
   private String url;
   @RequestMapping("hello")
   public String test(){
       return appid+"---"+secret+"---"+url;
   }
}

另一种方法

创建一个WeProperties

@Component
@Data
public class WeProperties {
   @Value("${wx.open.app_id}")
   private String appid;
   @Value("${wx.open.app_secret}")
   private String secret;
   @Value("${wx.open.redirect_url}")
   private String url;
}

Controller层

@RestController
public class UserController {
   @Autowired
   private WeProperties properties;
   @RequestMapping("hello")
   public String test(){
       return properties.getAppid()+"---"+properties.getSecret()+"---"+properties.getUrl();
   }
}

方法二：@Component+@ConfigurationProperties

创建一个WeProperties

后面的属性名一定要保持一致

@Component
@ConfigurationProperties(prefix = "wx.open")
@Data
public class WeProperties {
   private String appid;
   private String app_secret;
   private String redirect_url;
}

Controller层

@RestController
public class UserController {
   @Autowired
   private WeProperties properties;
   @RequestMapping("hello")
   public String test(){
       return properties.getAppid()+"---"+properties.getApp_secret()+"---"+properties.getRedirect_url();
   }
}

方法三：@ConfigurationProperties+@EnableConfigurationProperties

创建一个WeProperties

后面的属性名一定要保持一致

@ConfigurationProperties(prefix = "wx.open")
@Data
public class WeProperties {
   private String appid;
   private String app_secret;
   private String redirect_url;
}

启动类添加@EnableConfigurationProperties

@SpringBootApplication
@EnableConfigurationProperties(value = WeProperties.class)
public class PropertiesApplication {
   public static void main(String[] args) {
       SpringApplication.run(PropertiesApplication.class,args);
   }
}

Controller层

@RestController
public class UserController {
   @Autowired
   private WeProperties properties;
   @RequestMapping("hello")
   public String test(){
       return properties.getAppid()+"---"+properties.getApp_secret()+"---"+properties.getRedirect_url();
   }
}

来源：https://blog.csdn.net/qq_46548855/article/details/128892215