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

@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

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

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@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

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@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

以上所有加载出来的配置都可以通过Environment注入获取到。

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@Autowired private Environment env; // 获取参数 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。

http://www.javastack.cn/article/2017/spring-boot-load-config/