首先

一、在resources文件夹下新增自定义example.properties文件

com.example.name=demo
com.example.url=127.0.0.1:8080/demo

二、在Application启动类上添加@PropertySource注解

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.PropertySource;


@SpringBootApplication
@PropertySource(value = {"example.properties"})
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

1. 基于@Value注解读取

package com.example.demo.controller;


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


@RestController
public class TestController {

    @Value("${com.example.name:123}")  //如果com.example.name不存在,则采用默认在123
    private String projectName;

    @RequestMapping("/test")
    public String test(){
        return "ohh~初步访问!";
    }

    @RequestMapping("/test1")
    public String test1(){
        return projectName;
    }
}

2.基于@ConfigurationProperties注解读取

一.新建PropertiesConfig类

package com.example.demo.config;

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

@Data //使用需要新增lombok maven配置
@Component
@ConfigurationProperties(prefix = "com.example") //读取以com.example开头的变量
public class PropertiesConfig {

    private String name;

    private String url;
}

二.使用方式

package com.example.demo.controller;


import com.example.demo.config.PropertiesConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class TestController {

   @Autowired
   PropertiesConfig propertiesConfig;

    @RequestMapping("/test")
    public String test(){
        return "ohh~初步访问!";
    }

    @RequestMapping("/test1")
    public String test1(){
        return propertiesConfig.getName()+"-"+propertiesConfig.getUrl();
    }
}

3.基于Environment方式读取

package com.example.demo.controller;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class TestController {

  @Autowired
  Environment environment;

  @RequestMapping("/test")
  public String test() {
      return "ohh~初步访问!";
  }

  @RequestMapping("/test1")
  public String test1() {
      return environment.getProperty("com.example.name") + "-" + environment.getProperty("com.example.url");
  }
}