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
publicclassInfoConfig1{
@Value("${info.address}")
privateString address;
@Value("${info.company}")
privateString company;
@Value("${info.degree}")
privateString degree;
publicString getAddress(){
return address;
}
publicvoid setAddress(String address){
this.address = address;
}
publicString getCompany(){
return company;
}
publicvoid setCompany(String company){
this.company = company;
}
publicString getDegree(){
return degree;
}
publicvoid setDegree(String degree){
this.degree = degree;
}
}
@ConfigurationProperties注解读取方式
@Component
@ConfigurationProperties(prefix ="info")
publicclassInfoConfig2{
privateString address;
privateString company;
privateString degree;
publicString getAddress(){
return address;
}
publicvoid setAddress(String address){
this.address = address;
}
publicString getCompany(){
return company;
}
publicvoid setCompany(String company){
this.company = company;
}
publicString getDegree(){
return degree;
}
publicvoid setDegree(String degree){
this.degree = degree;
}
}
读取指定文件
资源目录下建立config/db-config.properties:
db.username=root
db.password=123456
@PropertySource+@Value注解读取方式
@Component
@PropertySource(value ={"config/db-config.properties"})
publicclassDBConfig1{
@Value("${db.username}")
privateString username;
@Value("${db.password}")
privateString password;
publicString getUsername(){
return username;
}
publicvoid setUsername(String username){
this.username = username;
}
publicString getPassword(){
return password;
}
publicvoid 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"})
publicclassDBConfig2{
privateString username;
privateString password;
publicString getUsername(){
return username;
}
publicvoid setUsername(String username){
this.username = username;
}
publicString getPassword(){
return password;
}
publicvoid 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
privateEnvironment 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。
