在Spring Boot中读取application.properties的3种方法

电玩女神 2024-03-27 04:35 53阅读 0赞

#### 目录 ####

*   *  方法一：@Value注解+@Component
     *  方法二：@Component+@ConfigurationProperties
     *  方法三：@ConfigurationProperties+@EnableConfigurationProperties

**application.properties有以下这几条数据**  
![在这里插入图片描述][f71a4d41ae274fc6a7f786a4595b6a41.png]

### 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;
        }
    
    
    }

![在这里插入图片描述][c32eb5283ac14fa2b0e59107aa9a92a1.png]**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();
        }
        
    }

![在这里插入图片描述][d935af3f9faf4eeeb885d6cb18f3efc2.png]

### 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();
        }
    
    }

![在这里插入图片描述][e8f9cbb4d25c41ce9ab014436b82549d.png]

### 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();
        }
    
    }

![在这里插入图片描述][34432104c0074d369f6519c6df5913bd.png]

[f71a4d41ae274fc6a7f786a4595b6a41.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/5383aaa9a4ce40daa0d4d977992ebd1a.png
[c32eb5283ac14fa2b0e59107aa9a92a1.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/28a54424cc2a4f03a32381a69e5c60ae.png
[d935af3f9faf4eeeb885d6cb18f3efc2.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/2569d3debf3943858e58012fdb570c09.png
[e8f9cbb4d25c41ce9ab014436b82549d.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/6d2d0411422b4197b1b54d20a1d73eb4.png
[34432104c0074d369f6519c6df5913bd.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/d2e6b77d304940548f123cbb6f4ab86d.png