SpringBoot笔记系列：（十九）加载自定义配置参数的两种方法

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SpringBoot中读取application.properties自定义配置参数的两种方法

1. 使用@Value读取单个参数
2. 使用@ConfigurationProperties读取多个参数并封装到bean中(需要在启动类中加上@EnableConfigurationProperties注解)

例如：

1. application.properties文件内容

   person.name=LiMing
   person.sex=男

2. Person.java内容

   package top.pcstar.springboothelloworld.entity;
   
   import org.springframework.boot.context.properties.ConfigurationProperties;
   
   /**
    * @Author: PanChao
    * @Description:
    * @Date: Created in 20:25 2018/7/22
    */
   @ConfigurationProperties("person")
   public class Person {
       private String name;
       private String sex;
   
       public String getName() {
           return name;
       }
   
       public void setName(String name) {
           this.name = name;
       }
   
       public String getSex() {
           return sex;
       }
   
       public void setSex(String sex) {
           this.sex = sex;
       }
   
       @Override
       public String toString() {
           return "Person{" +
                   "name='" + name + '\'' +
                   ", sex='" + sex + '\'' +
                   '}';
       }
   }
   

3. ReadparamController中查看是否读取成功

   package top.pcstar.springboothelloworld.controller;
   
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.beans.factory.annotation.Value;
   import org.springframework.web.bind.annotation.RequestMapping;
   import org.springframework.web.bind.annotation.RestController;
   import top.pcstar.springboothelloworld.entity.Person;
   
   /**
    * @Author: PanChao
    * @Description:
    * @Date: Created in 20:23 2018/7/22
    */
   @RestController
   public class ReadparamController {
       @Value("${person.name}")
       private String name;
       @Value("${person.sex}")
       private String sex;
       @Autowired
       private Person person;
       @RequestMapping("/read")
       public String read(){
           return "name="+name+"---sex="+sex;
       }
       @RequestMapping("/read1")
       public String read1(){
           return person.toString();
       }
   }
   

4. 启动类中加入@EnableConfigurationProperties注解

package top.pcstar.springboothelloworld;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import top.pcstar.springboothelloworld.entity.Person;

/**
 * @Author: PanChao
 * @Description: 启动类
 * @Date: Created in 12:56 2018/5/29
 */
//@EnableAutoConfiguration
//@ComponentScan(basePackages = "top.pcstar.springboothelloworld.controller")
//@EntityScan("top.pcstar.springboothelloworld.entity")
//@EnableJpaRepositories("top.pcstar.springboothelloworld.dao")
@SpringBootApplication
@EnableScheduling
@EnableAsync
@EnableConfigurationProperties(Person.class)
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }
}

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