SpringBoot讀取配置的5種方式
阿新 • • 發佈:2018-11-10
讀取application檔案
在application.yml或者properties檔案中新增:
info.address=USA
info.company=Spring
info.degree=high
@Value註解讀取方式
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("${info.degree}") private String degree; public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public String getCompany() { return company; } public void setCompany(String company) { this.company = company; } public String getDegree() { return degree; } public void setDegree(String degree) { this.degree = degree; } }
@ConfigurationProperties註解讀取方式
@Component @ConfigurationProperties(prefix = "info") public class InfoConfig2 { private String address; private String company; private String degree; public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public String getCompany() { return company; } public void setCompany(String company) { this.company = company; } public String getDegree() { return degree; } public void setDegree(String degree) { this.degree = degree; } }
讀取指定檔案
資源目錄下建立config/db-config.properties:
db.username=root
db.password=123456
@[email protected]註解讀取方式
@Component @PropertySource(value = { "config/db-config.properties" }) public class DBConfig1 { @Value("${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不支援yml檔案讀取。
@[email protected]註解讀取方式
@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讀取方式
以上所有加載出來的配置都可以通過Environment注入獲取到。
@Autowired
private Environment env;
// 獲取引數
String getProperty(String key);
總結
從以上示例來看,Spring Boot可以通過@PropertySource,@Value,@Environment,@ConfigurationProperties來繫結變數。
原文連結:https://www.jianshu.com/p/982e36f42c67