spring boot configuration item properties

Injection configuration content

Add application.yml the attribute values, for example:

# Property values ​​read from the configuration file
age: 26
gName: lisa
content: "age: ${age},aName: ${gName}"

Use @Value removed in ContentController

    // Use @value annotation value achieved injection configuration content 
    @Value ( "Age $ {}" )
     Private Integer Age;

    @Value("${gName}")
    private String name;

    @Value("${content}")
    private String content;

Again amend application.yml, examples are as follows:

server:
  port: 8081

person:
  age: 26
  gName: lisa

By @ Component, @ ConfigurationProperties injection configuration, for example:

package com.rongrong.springboot.demo;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

/**
 * @author rongrong
 * @version 1.0
 * @description:
 * @date 2019/12/28 13:56
 */
@Data
// injection configuration 
@Component
@ConfigurationProperties(prefix = "person")
public class Person {
    private Integer age;
    private String gName;
}

In the Controller, taken over the same bean

package com.rongrong.springboot.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author rongrong
 * @version 1.0
 * @description:
 * @date 2019/12/26 20:34
 */
@RestController
public class HellowController {


    @Autowired
    Person person;

    @RequestMapping(value = "/hellow",method = RequestMethod.GET)
    public String say(){
        return person.getGName();
    }

}

Start the project, by accessing the HTTP: // localhost: 8081 / hellow , page effect is as follows:

 

 

Multi-environment configuration

Yml create two files,

application-dev.yml

server:
  port: 8081

person:
  age: 26
  gName: lisa

 

application-prod.yml

server:
  port: 8888

person:
  age: 18
  gName: tony

Controlled by application.yml, a modified example as follows:

# Multi-environment configuration
spring:
  profiles:
    active: prod

Verify multi-context switching is correct

We use the command line to start the test, the first implementation mvn install package

Positioning the target, entering the command to switch to the environment dev

java -jar springboot_demo-0.0.1-SNAPSHOT.jar --spring.profiles.active=dev

effect:

 

Enter the following commands to switch to the environment prod

java -jar springboot_demo-0.0.1-SNAPSHOT.jar --spring.profiles.active=prod

effect: