4-1 YAML配置文件注入 JavaBean中

时间：2021-07-28 21:34:46 收藏：0 阅读：0

新建 javaBean，有那么多个成员变量：【get、set、toString 那些不用我教了吧......】

　　　　 private String lastName;
        private Integer age;
        private Boolean boss;
        private Date birth;
        private Map<String,Object> maps;
        private List<Object> lists;
        private Dog dog;　　//dog里面一个name（String） 一个age（Integer）

package com.bihu.Bean;

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



public class JavaBean {

        private String lastName;
        private Integer age;
        private Boolean boss;
        private Date birth;
        private Map<String,Object> maps;
        private List<Object> lists;
        private Dog dog;

        @Override
        public String toString() {
            return "Person{" +
                    "lastName=‘" + lastName + ‘\‘‘ +
                    ", age=" + age +
                    ", boss=" + boss +
                    ", birth=" + birth +
                    ", maps=" + maps +
                    ", lists=" + lists +
                    ", 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<String, Object> getMaps() {
            return maps;
        }

        public void setMaps(Map<String, Object> maps) {
            this.maps = maps;
        }

        public List<Object> getLists() {
            return lists;
        }

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

        public Dog getDog() {
            return dog;
        }

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

View Code

然后呢我们新建一个application.yml：

然后吧这些对着这些值写入：

person:
    lastName: hello
    age: 18
    boss: false
    birth: 2017/12/12
    maps: {k1: v1,k2: 12}
    lists:
     ‐ lisi
     ‐ zhaoliu
    dog:
      name: 小狗
      age: 12

怎么把yml配置文件的数据映射到JavaBean，我们在JavaBean中添加注解，但是要一个gav：

一定要这个gav 才能映射：

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

然后你在JavaBean类添加以下注解（注意看注释注释说明一切）

package com.bihu.Bean;

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

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

/**
 * 将配置文件中配置的每一个属性的值，映射到这个组件中
 * @Component:只有这个组件是容器中的组件，才能容器提供的@ConfigurationProperties功能；
 * @ConfigurationProperties：告诉SpringBoot将本类中的所有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
 */
@Component
@ConfigurationProperties(prefix = "person")
public class JavaBean {

        private String lastName;
        private Integer age;
        private Boolean boss;
        private Date birth;
        private Map<String,Object> maps;
        private List<Object> lists;
        private Dog dog;

        @Override
        public String toString() {
            return "Person{" +
                    "lastName=‘" + lastName + ‘\‘‘ +
                    ", age=" + age +
                    ", boss=" + boss +
                    ", birth=" + birth +
                    ", maps=" + maps +
                    ", lists=" + lists +
                    ", 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<String, Object> getMaps() {
            return maps;
        }

        public void setMaps(Map<String, Object> maps) {
            this.maps = maps;
        }

        public List<Object> getLists() {
            return lists;
        }

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

        public Dog getDog() {
            return dog;
        }

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

View Code

条件：

1.添加到SpringBoot 成为组件，用@Component 即可，

2.映射绑定：用@ConfigurationProperties绑定，其中用属性 prefix 说明绑定那个对象

最后我们测试一下，在SpringBoot下面的Test测试（自动生成的）

技术图片

按照下面我代码来即可：

package com.bihu;

import com.bihu.Bean.JavaBean;
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.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)    //有了@RunWith(SpringRunner.class)这些类才能实例化到spring容器中，自动注入才能生效，
@SpringBootTest
public class ApplicationTests {


    //这里测试JavaBean
    @Autowired
    JavaBean Person;

    @Test
    public void contextLoads() {
        System.out.println(Person);
    }

}

这里测试了 JavaBean，我们还打印了，结果如下：

Person{lastName=‘hello‘, age=18, boss=false, birth=Tue Dec 12 00:00:00 CST 2017, maps={k1=v1, k2=12}, lists=[‐ lisi ‐ zhaoliu], dog=Dog{name=‘小狗‘, age=12}}

可以看到完全注入进去了

这就是YAML配置文件注入 JavaBean中、

4-1 YAML配置文件 注入 JavaBean中

4-1 YAML配置文件注入 JavaBean中