test

src/main/java/com/cqu/springdemo/controller/hellocontroller.java

@@ -9,7 +9,8 @@
 public class hellocontroller {
     @RequestMapping("/hello")
     public String hello(){
-        return "hello";
+        return "hello22";
+//        lllll
     }
 
 }

src/main/java/com/cqu/springdemo/pojo/Dog.java

@@ -0,0 +1,37 @@
+package com.cqu.springdemo.pojo;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+@Component
+@ConfigurationProperties(prefix = "dog")
+public class Dog {
+    @Override
+    public String toString() {
+        return "Dog{" +
+                "name='" + name + '\'' +
+                ", age=" + age +
+                '}';
+    }
+
+    private String name;
+    private int age;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+
+}

src/main/java/com/cqu/springdemo/pojo/Person.java

@@ -0,0 +1,45 @@
+package com.cqu.springdemo.pojo;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+@Component
+@ConfigurationProperties(prefix = "person")
+public class Person {
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public Dog getDog() {
+        return dog;
+    }
+
+    public void setDog(Dog dog) {
+        this.dog = dog;
+    }
+
+    @Override
+    public String toString() {
+        return "Person{" +
+                "name='" + name + '\'' +
+                ", age=" + age +
+                ", dog=" + dog +
+                '}';
+    }
+
+    private String name;
+    private int age;
+    private Dog dog;
+}

src/main/resources/application.yml

@@ -0,0 +1,14 @@
+server:
+  port: 8081
+dog:
+  name: "旺财"
+  age: 10
+
+person:
+  name: "jack"
+  age: 10
+
+  dog:
+    name: ${person.goof:hello}_456
+    age: 10
+

src/test/java/com/cqu/springdemo/SpringdemoApplicationTests.java

@@ -1,13 +1,20 @@
 package com.cqu.springdemo;
 
+import com.cqu.springdemo.pojo.Dog;
+import com.cqu.springdemo.pojo.Person;
 import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 
 @SpringBootTest
 class SpringdemoApplicationTests {
-
+ @Autowired
+    private Dog dog;
+ @Autowired
+ private Person person;
     @Test
     void contextLoads() {
+        System.out.println(person);
     }
 
 }