SpringBoot获得application.properties中数据的几种方式

转:https://blog.csdn.net/qq_27298687/article/details/79033102

SpringBoot获得application.properties中数据的几种方式

第一种方式

 

@SpringBootApplication
public class SpringBoot01Application {

    public static void main(String[] args) {
        ConfigurableApplicationContext  context=SpringApplication.run(SpringBoot01Application.class, args);
        <span style="color:#FF0000;">String str1=context.getEnvironment().getProperty("aaa");</span>
        System.out.println(str1);
    }
}

 

 

第二种方式（自动装配到Bean中）

 

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

@Component
public class Student {



    @Autowired
    private Environment env;

    public void speak() {
        System.out.println("=========>" + env.getProperty("aaa"));

    }

}

 

 

第三种方式（使用@value注解）

 

package com.example.demo.entity;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Component
@PropertySource("classpath:jdbc.properties")//如果是application.properties，就不用写@PropertySource("application.properties")，其他名字用些
public class Jdbc {

    @Value("${jdbc.user}")
    private String user;

    @Value("${jdbc.password}")
    private String password;

    public void speack(){
        System.out.println("username:"+user+"------"+"password:"+password);
    }

 }