• SpringBoot:yaml配置注入bean

    SpringBoot使用一个全局的配置文件 ， 配置文件名称是固定的.
    有分成application.properties和application.yml两种结构,这两种结构:
    application.properties:

    语法结构 ：key=value

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    application.yml:

    语法结构 ：key：空格 value

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    配置文件的作用 ：修改SpringBoot自动配置的默认值，因为SpringBoot在底层都给我们自动配置好了；
    目前SpringBoot推荐使用yml的方式来进行配置

    注入配置文件

    三种注入方式: @Value注入;yaml配置文件注入; 自定义配置文件注入
    1.在springboot项目中的resources目录下新建一个文件 application.yml
    2.编写实体类Dog;

    package com.kuang.pojo;

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

@Component
public class Dog {

    private  String name;
    private Integer age;

    public Dog(){

    }

    public Dog(String name,Integer age){
        this.name=name;
        this.age=age;
    }

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

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

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


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    2.编写实体类Person类

    package com.kuang.pojo;

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

@Component
public class Person {
    private  String name;
    private Integer age;
    private Boolean happy;
    private Date birth;
    private Map<String,Object> maps;
    private List<Object> lists;
    private Dog dog;

    public Person() {
    }

    public Person(String name, Integer age, Boolean happy, Date birth, Map<String, Object> maps, List<Object> lists, Dog dog) {
        this.name = name;
        this.age = age;
        this.happy = happy;
        this.birth = birth;
        this.maps = maps;
        this.lists = lists;
        this.dog = dog;
    }

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

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

    public Boolean getHappy() {
        return happy;
    }

    public void setHappy(Boolean happy) {
        this.happy = happy;
    }

    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;
    }

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

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    第一种通过@Value注入

    package com.kuang.pojo;

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

@Component
public class Dog {
    @Value("旺财")
    private  String name;
    @Value("3")
    private Integer age;

    public Dog(){

    }

    public Dog(String name,Integer age){
        this.name=name;
        this.age=age;
    }

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

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

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

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    在Springboot测试类上测试:

    package com.kuang;

import com.kuang.pojo.Dog;
import com.kuang.pojo.Person;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class Springboot01HelloworldApplicationTests {

    @Autowired
    private Dog dog;

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

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    启动测试类:
    在这里插入图片描述

    第二种通过yaml配置文件注入

    application.yml 全局配置文件进行对象属性配置:

    person:
    name: ${random.int}
    age: ${random.int}
    happy: false
    birth: 2019/11/02
    maps: {k1: v1,k2: v2}
    lists:
      - code
      - music
      - girl
    dog:
      name: ${person.hello:hello}_旺财
      age: 3

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    其中, r a n d o m . i n t : 随 机 赋 值 ; {random.int}:随机赋值; random.int:随机赋值;{person.hello:hello} 如果person.hello存在,则使用该值,如果不存在,则使用hello赋值
    在person类中添加注解:@ConfigurationProperties(prefix = “person”) :将该类与配置文件application.yaml中的person进行绑定,在使用这个注解的时候,会提示包红,根据报红调跳转的页面

    package com.kuang.pojo;

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

@Component
@ConfigurationProperties(prefix = "person")
public class Person {
    private  String name;
    private Integer age;
    private Boolean happy;
    private Date birth;
    private Map<String,Object> maps;
    private List<Object> lists;
    private Dog dog;

    public Person() {
    }

    public Person(String name, Integer age, Boolean happy, Date birth, Map<String, Object> maps, List<Object> lists, Dog dog) {
        this.name = name;
        this.age = age;
        this.happy = happy;
        this.birth = birth;
        this.maps = maps;
        this.lists = lists;
        this.dog = dog;
    }

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

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

    public Boolean getHappy() {
        return happy;
    }

    public void setHappy(Boolean happy) {
        this.happy = happy;
    }

    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;
    }

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


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    启动测试类
    在这里插入图片描述

    自定义配置文件注入

    在application.yaml的同级目录下创建qinjiang.properties
    配置文件内容如下

    name= qinjiang

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    在Person类上添加@PropertySource(value = “classpath:qinjiang.properties”)和@Value(“${name}”)

    package com.kuang.pojo;

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

@Component
@PropertySource(value = "classpath:qinjiang.properties")
public class Person {
    @Value("${name}")
    private  String name;
    private Integer age;
    private Boolean happy;
    private Date birth;
    private Map<String,Object> maps;
    private List<Object> lists;
    private Dog dog;

    public Person() {
    }

    public Person(String name, Integer age, Boolean happy, Date birth, Map<String, Object> maps, List<Object> lists, Dog dog) {
        this.name = name;
        this.age = age;
        this.happy = happy;
        this.birth = birth;
        this.maps = maps;
        this.lists = lists;
        this.dog = dog;
    }

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

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

    public Boolean getHappy() {
        return happy;
    }

    public void setHappy(Boolean happy) {
        this.happy = happy;
    }

    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;
    }

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

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    启动测试类
    在这里插入图片描述

    以上三种方法是对bean进行注入的方式。

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  • 原文地址：https://blog.csdn.net/weixin_43586713/article/details/125600878