转载自 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

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

@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

@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

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

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