springboot_day04加载外部属性文件

一、加载外部配置文件的注解

1、加载指定的配置文件(@PropertySource)

1.1 实体类

package com.itheima.bean;

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

import java.util.Date;
import java.util.List;
import java.util.Map;

/**
 * @author jsz
 * @create 2019/4/29
 * 将配置文件总配置的每一个属性的值,映射到这个组件中
 * @ConfigurationProperties :
 *      使用前提:只有这个组件是容器中的组件,才能使用@ConfigurationProperties的功能
 *      告诉springBoot将本类中所有的属性和配置文件中相关的配置进行绑定
 *      prefix = "person": 配置文件中哪个下面的所有属性进行一一映射
 *      默认使用全局配置文件
 */
@Component
@ConfigurationProperties(prefix = "person")
@PropertySource(value = {"classpath:person.properties"})//读取指定的properties配置文件中的值
public class Person {

    private String lastName;
    private Integer age;
    private Boolean boss;
    private Date birth;

    private Map maps;
    private List lists;

    private Dog dog;

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Integer getAge() {
        return age;
    }

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

    public Boolean getBoss() {
        return boss;
    }

    public void setBoss(Boolean boss) {
        this.boss = boss;
    }

    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }

    public Map getMaps() {
        return maps;
    }

    public void setMaps(Map maps) {
        this.maps = maps;
    }

    public List getLists() {
        return lists;
    }

    public void setLists(List lists) {
        this.lists = lists;
    }

    public Dog getDog() {
        return dog;
    }

    public void setDog(Dog dog) {
        this.dog = dog;
    }

    @Override
    public String toString() {
        return "Person{" +
                "lastName='" + lastName + '\'' +
                ", age=" + age +
                ", boss=" + boss +
                ", birth=" + birth +
                ", maps=" + maps +
                ", lists=" + lists +
                ", dog=" + dog +
                '}';
    }
} 
  

 1.2配置文件

springboot_day04加载外部属性文件_第1张图片

1.3测试结果

springboot_day04加载外部属性文件_第2张图片

2、导入spring配置文件(@ImportResource)

加在主配置类上,不推荐使用

2.1主配置类

package com.itheima;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ImportResource;

@SpringBootApplication
@ImportResource(locations = {"classpath:beans.xml"})
public class Springboot01Application {

    public static void main(String[] args) {
        SpringApplication.run(Springboot01Application.class, args);
    }

}

2.2配置文件

springboot_day04加载外部属性文件_第3张图片

2.3测试类

package com.itheima;

import com.itheima.bean.Person;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.junit4.SpringRunner;

/**
 * springBoot单元测试
 * 可以在测试期间很方便的类似编码一样进行自动注入等容器的功能
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class Springboot01ApplicationTests {

    @Autowired
    private Person person;

    @Autowired
    private ApplicationContext ioc;

    @Test
    public void testHelloService(){
        Boolean flag = ioc.containsBean("helloService");
        System.out.println(flag);
    }

}

2.4测试结果

3、springBoot推荐方式

3.1配置类

package com.itheima.config;

import com.itheima.service.HelloService;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author jsz
 * @create 2019/4/9
 * @Configuration 指明当前类是一个配置类,就是来代替之前的spring配置文件
 */
@Configuration
public class MyAppConfig {

    //将方法的返回值添加到容器中,容器中这个组件默认的id就是方法名
    @Bean
    public HelloService helloService02(){
        System.out.println("配置类@Bean给容器中添加组件了");
        return new HelloService();
    }
}

3.2测试类

package com.itheima;

import com.itheima.bean.Person;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.junit4.SpringRunner;

/**
 * springBoot单元测试
 * 可以在测试期间很方便的类似编码一样进行自动注入等容器的功能
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class Springboot01ApplicationTests {

    @Autowired
    private Person person;

    @Autowired
    private ApplicationContext ioc;

    @Test
    public void testHelloService(){
        Boolean flag = ioc.containsBean("helloService02");
        System.out.println(flag);
    }

}

3.3测试结果

springboot_day04加载外部属性文件_第4张图片

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