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
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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("${info.degree}")
private String degree;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getCompany() {
return company;
}
public void setCompany(String company) {
this.company = company;
}
public String getDegree() {
return degree;
}
public void setDegree(String degree) {
this.degree = degree;
}
}
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@ConfigurationProperties注解读取方式
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@Component
@ConfigurationProperties(prefix = "info")
public class InfoConfig2 {
private String address;
private String company;
private String degree;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getCompany() {
return company;
}
public void setCompany(String company) {
this.company = company;
}
public String getDegree() {
return degree;
}
public void setDegree(String degree) {
this.degree = degree;
}
}
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读取指定文件
资源目录下建立config/db-config.properties:
db.username=root
db.password=123456
@PropertySource+@Value注解读取方式
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@Component
@PropertySource(value = { "config/db-config.properties" })
public class DBConfig1 {
@Value("${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;
}
}
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注意：@PropertySource不支持yml文件读取。
@PropertySource+@ConfigurationProperties注解读取方式
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@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;
}
}
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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。
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@Autowired
private Environment env;
// 获取参数
String getProperty(String key);
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总结
从以上示例来看，Spring Boot可以通过@PropertySource,@Value,@Environment,@ConfigurationProperties来绑定变量。
http://www.javastack.cn/article/2017/spring-boot-load-config/