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

悠悠 2022-05-27 00:26 167阅读 0赞

# SpringBoot获得application.properties中数据的几种方式![Center][] #

## 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: rgb(255, 0, 0);">String str1=context.getEnvironment().getProperty("aaa");</span>
    		System.out.println(str1);
    	}
    }

@SpringBootApplication
    public class SpringBoot01Application {
    
    	public static void main(String[] args) {
    		ConfigurableApplicationContext  context=SpringApplication.run(SpringBoot01Application.class, args);
    		String str1=context.getEnvironment().getProperty("aaa");
    		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） ##

![Center 1][]

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@PropertyScource("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);  
        }  
      
    }

[Center]: /images/20220527/64ab7499e6274068a2dd2fdf28ac0258.png
[Center 1]: /images/20220527/f2ba59881fb74751a403b3782d8e682d.png