• 读取的配置文件application.yml:

  jianshu:id: futaosmile

1. 使用@ConfigurationProperties注解注入

@RunWith(SpringRunner.class)
@SpringBootTest
@ConfigurationProperties(prefix = "jianshu")
public class SpringmvcdemoApplicationTests {private String id;@Testpublic void test10() {System.out.println(id);}
}

• 输出null，注入失败
• 原因：使用@ConfigurationProperties注解的方式注入为每个注入的字段添加setter方法

package com.futao.springmvcdemo;import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;@RunWith(SpringRunner.class)
@SpringBootTest
@ConfigurationProperties(prefix = "jianshu")
public class SpringmvcdemoApplicationTests {private String id;@Testpublic void test10() {System.out.println(id);}public void setId(String id) {this.id = id;}
}

• 输出:
  

2. 使用@Value注解

package com.futao.springmvcdemo;import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringmvcdemoApplicationTests {@Value("${jianshu.id}")private String id;@Testpublic void test10() {System.out.println(id);}}

• 输出：
  

OK