Spring Boot读取配置的几种方式

读取application文件

在application.yml或者properties文件中添加：

info.address=USA

info.company=Spring

info.degree=high

1.@Value注解读取方式

import org.springframework.beans.factory.annotation.Value;

import org.springframework.stereotype.Component;



@Component

public class InfoConfig1 {


   @Value("${info.address}")

   private String address;


   @Value("${info.company}")

   private String company;


   @Value("${info.degree}")

   private String degree;


   public String getAddress() {

       return address;

   }
   public void setAddress(String address) {

       this.address = address;

   }

   public String getCompany() {

       return company;

   }

   public void setCompany(String company) {

       this.company = company;

   }

   public String getDegree() {

       return degree;

   }

   public void setDegree(String degree) {

       this.degree = degree;

   }
}

2.@ConfigurationProperties注解读取方式

1. @Component
   
   @ConfigurationProperties(prefix = "info")
   
   public class InfoConfig2 {
   
   
   
      private String address;
   
      private String company;
   
      private String degree;
   
   
   
      public String getAddress() {
   
          return address;
   
      }
   
   
   
      public void setAddress(String address) {
   
          this.address = address;
   
      }
   
   
   
      public String getCompany() {
   
          return company;
   
      }
   
   
   
      public void setCompany(String company) {
   
          this.company = company;
   
      }
   
   
   
      public String getDegree() {
   
          return degree;
   
      }
   
   
   
      public void setDegree(String degree) {
   
          this.degree = degree;
   
      }
   
   
   
   }

    

读取指定文件

资源目录下建立config/db-config.properties:

db.username=root

db.password=123456

3.@PropertySource+@Value注解读取方式

1. @Component

2. @PropertySource(value = { "config/db-config.properties" })

3. public class DBConfig1 {

4.  

5.    @Value("${db.username}")

6.    private String username;

7.  

8.    @Value("${db.password}")

9.    private String password;

10.  

11.    public String getUsername() {

12.        return username;

13.    }

14.  

15.    public void setUsername(String username) {

16.        this.username = username;

17.    }

18.  

19.    public String getPassword() {

20.        return password;

21.    }

22.  

23.    public void setPassword(String password) {

24.        this.password = password;

25.    }

26.  

27. }

注意：@PropertySource不支持yml文件读取。

4.@PropertySource+@ConfigurationProperties注解读取方式

1. @Component
   
   @ConfigurationProperties(prefix = "db")
   
   @PropertySource(value = { "config/db-config.properties" })
   
   public class DBConfig2 {
   
   
   
      private String username;
   
      private String password;
   
   
   
      public String getUsername() {
   
          return username;
   
      }
   
   
   
      public void setUsername(String username) {
   
          this.username = username;
   
      }
   
   
   
      public String getPassword() {
   
          return password;
   
      }
   
   
   
      public void setPassword(String password) {
   
          this.password = password;
   
      }
   
   
   
   }

   5.Environment读取方式

以上所有加载出来的配置都可以通过Environment注入获取到。

1. @Autowired

2. private Environment env;

3.  

4. // 获取参数

5. String getProperty(String key);

总结

从以上示例来看，Spring Boot可以通过@PropertySource,@Value,@Environment,@ConfigurationProperties来绑定变量。

 

转载来自：https://mp.weixin.qq.com/s/aen2PIh0ut-BSHad-Bw7hg