SpringBoot配置参数绑定@[email protected]

将spring配置文件中配置的参数绑定给组件的属性

• • 作用
  • 实现
  • @Value和@ConfigurationProperties示例
  • 配置类@[email protected]示例

作用

• 将spring配置文件中配置的参数绑定给组件的属性

实现

步骤

1. 容器中注册组件
2. 参数绑定

注册组件

• @Component
• @Repository
• @Service
• @Controller
• @RestController
• @[email protected]
• 等等

参数绑定种类

• 单个属性绑定：组件[email protected]
• 批量属性绑定：组件[email protected]
• 批量属性绑定：配置类@[email protected]

说明：容器组件@[email protected]也是可以实现配置参数绑定功能，但是从系统设计角度不推荐这么做；就像@[email protected]也能实现组件注册功能一样能实现但是不推荐

@Value和@ConfigurationProperties示例

• 待绑定属性的容器组件

package com.ultra.config;


import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "user1")
public class User {
    private String name;
    @Value("use1.nickname")
    private String nickname;

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", nickname='" + nickname + '\'' +
                '}';
    }
}

• spring配置文件

user1.name=XiaoMing
user1.nickname=XiaoBaiLong

• 测试类/启动类

package com.ultra;

import com.ultra.config.User;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

/**
 * @author admin
 */
@SpringBootApplication
public class SpringbootWebApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext applicationContext = SpringApplication.run(SpringbootWebApplication.class, args);
        User user = applicationContext.getBean(User.class);
        System.out.println(user);
    }
}

• 结果
  

配置类@[email protected]示例

• 待绑定属性的容器组件

package com.ultra.config;


import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;

@Component@ConfigurationProperties(prefix = "user1")
public class User {
    private String name;
    @Value("use1.nickname")
    private String nickname;

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", nickname='" + nickname + '\'' +
                '}';
    }
}

• spring配置文件

user1.name=XiaoMing
user1.nickname=XiaoBaiLong

• 配置类

package com.ultra.config;

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

@Configuration
@EnableConfigurationProperties({User.class})
public class UserConfig {
}

• 测试类/启动类

package com.ultra;

import com.ultra.config.User;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

/**
 * @author admin
 */
@SpringBootApplication
public class SpringbootWebApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext applicationContext = SpringApplication.run(SpringbootWebApplication.class, args);
        User user = applicationContext.getBean(User.class);
        System.out.println(user);
    }
}

• 结果