@PropertySourece()

my.properties

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name=kil

UserService.java

添加@PropertySource(“my.properties”)指定配置文件 引用@Value(“${name}”)

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package cn.kil.springboot_parameter.service;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

/**
 * @program: springboot_parameter
 * @ClassName: UserService
 * @description:
 * @author: toy
 * @create: 2022-07-20 19:51
 */
@Service
@PropertySource("my.properties")
public class UserService {

    @Value("${name}")
    private String name;

    public void test(){
        System.out.println(name);
    }
}

SpringbootParameterApplication.java #Spring启动类

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package cn.kil.springboot_parameter;

import cn.kil.springboot_parameter.service.UserService;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.PropertySource;

@SpringBootApplication
public class SpringbootParameterApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext applicationContext = SpringApplication.run(SpringbootParameterApplication.class, args);
        UserService bean = applicationContext.getBean(UserService.class);
        bean.test();
    }
}

@ConfigurationProperties

@ConfigurationProperties 让开发者将整个配置文件，自动映射到对象中，比@Value 效率更高

需要添加@Component注册bean

属性：

  • prefix：可以配置文件属性前缀

MyProperties.java

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package cn.kil.springboot_parameter.properties;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

/**
 * @program: springboot_parameter
 * @ClassName: MyProperties
 * @description: 我的配置
 * @author: toy
 * @create: 2022-07-20 19:50
 */
@Component
@ConfigurationProperties(prefix = "kil")
public class MyProperties {

    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

UserService.java

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package cn.kil.springboot_parameter.service;

import cn.kil.springboot_parameter.properties.MyProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @program: springboot_parameter
 * @ClassName: UserService
 * @description:
 * @author: toy
 * @create: 2022-07-20 19:51
 */
@Service
public class UserService {

    @Autowired
    private MyProperties myProperties;

    public void test(){
        System.out.println(myProperties.getName());
    }
}

application.properties

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kil.name=kil
  • 标准用法 配置类**@EnableConfigurationProperties(MyProperties.class)代替@Component**。方便添加条件，可设置多个配置文件

AppConfig.java

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import cn.kil.springboot_parameter.properties.MyProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Configuration;

/**
 * @program: springboot_parameter
 * @ClassName: AppConfig
 * @description:
 * @author: toy
 * @create: 2022-07-20 23:56
 */
@Configuration
@EnableConfigurationProperties(MyProperties.class)
public class AppConfig {

}
  • @ConfigurationPropertiesScan(“cn.kil.springboot_parameter.properties”) //扫描包下的配置文件

AppConfig.java

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package cn.kil.springboot_parameter;

import org.springframework.boot.context.properties.ConfigurationPropertiesScan;
import org.springframework.context.annotation.Configuration;

/**
 * @program: springboot_parameter
 * @ClassName: AppConfig
 * @description:
 * @author: toy
 * @create: 2022-07-20 23:56
 */
@Configuration
@ConfigurationPropertiesScan("cn.kil.springboot_parameter.properties")
public class AppConfig {

}

文件目录信息