Spring boot获取yml字段内容为null的各种情况

首先，在resource目录下配置test.yml文件

A:
  B: http://123.com?
  C: username="lili"&password="123456"
  D: username="lisa"&password="123456"

1.为了调用方便，将参数全部设置为static，结果可想而知，获取不到，只能是null

package com.example.demo.constants;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class TestYml {
public static String B;
public static String C;
public static String D;
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span><span style="color: #000000;"> String getB() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> B;
}
@Value(</span>"${A.B}"<span style="color: #000000;">)
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setB(String b) {
    B </span>=<span style="color: #000000;"> b;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span><span style="color: #000000;"> String getC() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> C;
}
@Value(</span>"${A.C}"<span style="color: #000000;">)
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setC(String c) {
    C </span>=<span style="color: #000000;"> c;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span><span style="color: #000000;"> String getD() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> D;
}
@Value(</span>"${A.D}"<span style="color: #000000;">)
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setD(String d) {
    D </span>=<span style="color: #000000;"> d;
}

}

执行测试代码

@RunWith(SpringRunner.class)
@SpringBootTest(classes = Application.class)
public class ApplicationTests {
    @Test
    public void test(){
        String b = TestYml.B;
        System.out.println(b);
    }
}

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