Spring Boot读取配置的几种方式

 

读取application文件

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在application.yml或者properties文件中添加：

info.address=USA
info.company=Spring
info.degree=high

 

@Value注解读取方式

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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;
   }

}

 

@ConfigurationProperties注解读取方式

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@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

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资源目录下建立config/db-config.properties:

db.username=root
db.password=123456

@PropertySource+@Value注解读取方式

@Component
@PropertySource(value = { "config/db-config.properties" })
public class DBConfig1 {

   @Value("${db.username}")
   private String username;

   @Value("${db.password}")
   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;
   }

}

注意：@PropertySource不支持yml文件读取。

 

@PropertySource+@ConfigurationProperties注解读取方式

@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;
   }

}

 

Environment读取方式

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以上所有加载出来的配置都可以通过Environment注入获取到。

@Autowired
private Environment env;

// 获取参数
String getProperty(String key);

 

总结

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