외부설정 - 프로퍼티 타입 컨버전, 프로퍼티 값 검증 @validated

src/main/java/io/namjune/springbootconceptandutilization/NamjuneProperties.java

@@ -1,16 +1,26 @@
 package io.namjune.springbootconceptandutilization;
 
+import java.time.Duration;
+import java.time.temporal.ChronoUnit;
+import javax.validation.constraints.NotEmpty;
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.convert.DurationUnit;
 import org.springframework.stereotype.Component;
+import org.springframework.validation.annotation.Validated;
 
 @Component
 @ConfigurationProperties("nj")
+@Validated
 public class NamjuneProperties {
 
+    @NotEmpty
     private String name;
     private int age;
     private String fullName;
 
+    @DurationUnit(ChronoUnit.SECONDS)
+    private Duration sessionTimeout = Duration.ofSeconds(30);
+
     public String getName() {
         return name;
     }
@@ -34,4 +44,12 @@ public String getFullName() {
     public void setFullName(String fullName) {
         this.fullName = fullName;
     }
+
+    public Duration getSessionTimeout() {
+        return sessionTimeout;
+    }
+
+    public void setSessionTimeout(Duration sessionTimeout) {
+        this.sessionTimeout = sessionTimeout;
+    }
 }

src/main/java/io/namjune/springbootconceptandutilization/SampleRunner.java

@@ -17,6 +17,7 @@ public void run(ApplicationArguments args) throws Exception {
         System.out.println(namjuneProperties.getName());
         System.out.println(namjuneProperties.getAge());
         System.out.println(namjuneProperties.getFullName());
+        System.out.println(namjuneProperties.getSessionTimeout());
         System.out.println("==========================");
     }
 }

src/main/resources/application.yml

@@ -1,4 +1,5 @@
 nj:
   name: namjune
   age: ${random.int(0,100)}
-  fullName: ${nj.name} Kim
+  fullName: ${nj.name} Kim
+  sessionTimeout: 30