注解注入失败输出为null

Question

public class HFtest {

@Value("${HF}")
private String HF;

@Test
public void hf(){
    System.out.println(HF);
}

}

applicationContext.xml



classpath:resource.properties

Answer 1

<!-- 读取属性文件，否则 java 类无法直接读取属性 -->
<context:property-placeholder location="classpath:app.properties"/>