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@ConfigurationProperties注解的使用与@Value的使用

日期：2018-10-10点击：510收藏

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; @Test public 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; @Test public 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; @Test public void test10() { System.out.println(id); } }