#注意：在yml文件中添加value值时，value前面需要加一个空格 
ip: 127.0.0.0 
port: 8080 

package com.example; 
import org.springframework.beans.factory.annotation.Value; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RestController; 
@RestController 
public class ConfigController { 
 @Value("${ip}")//获取application.yml文件中名为ip的value值 
 private String ip; 
 @Value("${port}")//获取application.yml文件中名为port的value值，并且自动完成数据类型转换 
 private Integer port; 
 @RequestMapping("/config") 
 public String config() { 
  return "ip:"+ip+",port:"+port; 
 } 
} 

package com.example; 
import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 
//入口 
@SpringBootApplication 
public class SpringbootdemoApplication { 
 public static void main(String[] args) { 
  SpringApplication.run(SpringbootdemoApplication.class, args); 
 } 
} 

devconfig: 
 ip: 127.0.0.0 
 port: 8080 

package com.example; 
 import org.springframework.boot.context.properties.ConfigurationProperties; 
import org.springframework.stereotype.Component; 
@Component 
@ConfigurationProperties(prefix = "devconfig")//获取前缀为devconfig下的配置信息 
public class ConfigBean { 
 private String ip;//名字与配置文件中一致 
 private Integer port; 
 public String getIp() { 
  return ip; 
 } 
 public void setIp(String ip) { 
  this.ip = ip; 
 } 
 public Integer getPort() { 
  return port; 
 } 
 public void setPort(Integer port) { 
  this.port = port; 
 } 
} 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.beans.factory.annotation.Value; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RestController; 
@RestController 
public class ConfigController { 
// @Value("${ip}")//获取application.yml文件中名为ip的value值 
// private String ip; 
// 
// @Value("${port}")//获取application.yml文件中名为port的value值，并且自动完成数据类型转换 
// private Integer port; 
 //自动注入，实例化bean 
 @Autowired 
 private ConfigBean configBean; 
 @RequestMapping("/config") 
 public String config() { 
  return "另一种方式： ip:"+configBean.getIp()+",port:"+configBean.getPort(); 
 } 
} 

config: 
 ip: 127.0.0.0 
 port: 8080 

config: 
 ip: 127.0.0.1 
 port: 8081 

spring: 
 profiles: 
 active: produce 

package com.example; 
import org.springframework.boot.context.properties.ConfigurationProperties; 
import org.springframework.stereotype.Component; 
@Component 
@ConfigurationProperties(prefix = "config") 
public class ConfigBean { 
 private String ip;//名字与配置文件中一致 
 private Integer port; 
 public String getIp() { 
  return ip; 
 } 
 public void setIp(String ip) { 
  this.ip = ip; 
 } 
 public Integer getPort() { 
  return port; 
 } 
 public void setPort(Integer port) { 
  this.port = port; 
 } 
} 

Java -jar XXX.jar --spring.profiles.active=poduce