读取application文件

在application.yml或者properties文件中添加：

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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;
 }

}

@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;
 }

}

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;
 }

}

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;
 }

}

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);

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/

 

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