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。
