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

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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: 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）

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);  
    }  
  
}