SpringBoot配置文件的属性注入

spring中配置文件的属性注入都是@Value("${}")这种，springboot中提供了另一种（可以说是简化吧）。

1.pom.xml中引入：

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-configuration-processor</artifactId>
	<optional>true</optional>
</dependency>

亲测：不引入也可（可能是其他依赖包中已引入）

2.application.properties中编写配置：

mytest.name=haha
mytest.password=123456
mytest.age=26

3.配置文件的属性注入类：

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

/**
 * @description:
 * @author: 
 * @create: 2019-02-12 09:54
 **/
@Component
@ConfigurationProperties(prefix = "mytest")//prefix指定了配置文件属性的前缀为mytest，并且按照属性名进行自动匹配，例如：mytest.name属性值会自动setter到private String name域中。
public class EntityTest {

    private String name;
    private String password;
    private Integer age;

    @Override
    public String toString() {
        return "EntityTest{" +
                "name='" + name + '\'' +
                ", password='" + password + '\'' +
                ", age=" + age +
                '}';
    }

    public String getName() {
        return name;
    }

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

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

注意：setter方法是必须的！

4.启动类测试：

@org.springframework.boot.autoconfigure.SpringBootApplication//@EnableAutoConfiguration @ComponentScan
public class SpringBootApplication implements CommandLineRunner {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootApplication.class, args);
    }

    @Autowired
    EntityTest entityTest;

    @Override
    public void run(String... args) throws Exception {
        System.out.println(entityTest);
    }
}

运行结果：EntityTest{name='haha', password='123456', age=26}