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;@ComponentpublicclassInfoConfig1{@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。
@AutowiredprivateEnvironment 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。
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