背景信息

Spring Demo文件：

• UserController類對象：為@Value配置，用于測試@PostConstruct注解，此階段可識別持久化值，部分內容如下。

  @RestController
  public class UserController {
  
      @Value("${project.name}")
      public String name;
  
      @Value("${user.ahas}")
      public boolean ahas;
  
      @Value("${user.number}")
      public int num;
  
      @Value("${destination}")
      public String destinationStr;
  
  
      @Autowired
      private Destination destination;
  
      @PostConstruct
      private void init(){
          System.out.println("[UserController] init()  value: "+ destinationStr +" , " + num + " , "+ ahas + " , " + name);
          System.out.println("[UserController] init()  configuration: "+destination.getAvg()+" , " + destination.getMax() + " , "+ destination.getMin());
      }
  }

• DemoConfig類對象：為@Value配置，用于測試InitializingBean，afterPropertiesSet函數，初始化階段可讀取到持久化值，內容如下。

  @Configuration
  public class DemoConfig implements InitializingBean {
      @Autowired
      private RequestProperties requestProperties;
  
      @Override
      public void afterPropertiesSet() {
          System.out.println("[DemoConfig] init()  port: " + requestProperties.getPort() + " ,interface: " + requestProperties.getInter());
      }
  
  }

• RequestProperties類對象：為@ConfigurationProperties配置，Value模式。

  @Component
  @ConfigurationProperties(value = "request")
  public class RequestProperties {
      private int port;
  
      private String inter;
  
      public int getPort() {
          return port;
      }
  
      public void setPort(int port) {
          this.port = port;
      }
  
      public String getInter() {
          return inter;
      }
  
      public void setInter(String inter) {
          this.inter = inter;
      }
  }

• Destination類對象：為@ConfigurationProperties配置，Prefix模式。

  @Component
  @ConfigurationProperties(prefix = "property.destination")
  public class Destination {
      private int max;
      private int min;
      private int avg;
  
      public int getMax() {
          return max;
      }
  
      public void setMax(int max) {
          this.max = max;
      }
  
      public int getMin() {
          return min;
      }
  
      public void setMin(int min) {
          this.min = min;
      }
  
      public int getAvg() {
          return avg;
      }
  
      public void setAvg(int avg) {
          this.avg = avg;
      }
  }

• application.properties配置內容如下。

  user.ahas=false
  user.number=123
  
  request.port=8081
  request.inter=/hello
  
  destination=sun
  
  property.destination.max=300
  property.destination.min=10
  property.destination.avg=100