SpringBoot中读取配置文件的几种方式

1.读取application文件

在application.yml或者properties文件中添加：

info:
name: xiaoming
age: 13
sex: 1

读取方式如下:

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;/*
* 通过@value注解的方式读取
*/
@Component
public class TechUser {
@Value("${info.name}")
private String name;
@Value("${info.age}")
private int age;
@Value("${info.sex}")
private int sex; public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public int getAge() {
return age;
} public void setAge(int age) {
this.age = age;
} public int getSex() {
return sex;
} public void setSex(int sex) {
this.sex = sex;
}
}@ConfigurationProperties注解读取方式import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;@Component
@ConfigurationProperties(prefix = "info")
public class TechUser {
private String name;
private int age;
private int sex; public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public int getAge() {
return age;
} public void setAge(int age) {
this.age = age;
} public int getSex() {
return sex;
} public void setSex(int sex) {
this.sex = sex;
}
}

2.读取指定文件

资源目录下建立config/db-config.properties:

db.username=rootdb.password=123456

2.1@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。

2.2@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;
}
}


3.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;