打卡7:基於properties的類型安全配置

1. application.properties文件

   muzi.name=keyloved
   muzi.age=23
   

2. 類型安全的Bean類

   import org.springframework.boot.context.properties.ConfigurationProperties;
   import org.springframework.stereotype.Component;
   
   @Component
   /**
    * 通過@ConfigurationProperties加載properties文件內的配置，prefix="muzi"屬性指定properties的配置前綴爲muzi
    */
   @ConfigurationProperties(prefix = "muzi")
   public class MuziSettings {
   
       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;
       }
   }
   

3. 測試代碼

   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.boot.SpringApplication;
   import org.springframework.boot.autoconfigure.SpringBootApplication;
   import org.springframework.web.bind.annotation.RequestMapping;
   import org.springframework.web.bind.annotation.RestController;
   
   @RestController
   @SpringBootApplication
   public class MuziApplication {
   
       @Autowired
       private MuziSettings muziSettings;
   
       @RequestMapping("/muzi")
       public String index() {
           return "name:"+ muziSettings.getName() + "，and age:" + muziSettings.getAge();
       }
   
       public static void main(String[] args) {
           SpringApplication.run(MuziApplication.class,args);
       }
   }
   

4. 運行結果
   訪問：http://localhost:8080/muzi
   結果： name:keyloved，and age:23