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
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。

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