SpringBoot属性赋值的三种方式

╰半夏微凉° 2023-01-21 11:24 1阅读 0赞

# 方式一：在属性字段上增加@Value注解并赋值 #

package com.zhang;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Component;
    
    @Component
    public class Dog { 
        @Value("小黑")
        private String name;
        @Value("1")
        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;
        }
    }

测试类

package com.zhang;
    
    import org.junit.jupiter.api.Test;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    
    @SpringBootTest
    class SpringbootApplicationTests { 
    	@Autowired
    	private  Dog dog;
    	@Test
    	void contextLoads() { 
    		System.out.println(dog.getName()+"-----"+dog.getAge());
    	}
    }

# 方式二：在yml中赋值 #

注意：yml中每个冒号后面必须要有空格，否则配置不生效。  
**ConfigurationProperties**注解将yml中相关配置和本类的所有属性，  
进行绑定@ConfigurationProperties(prefix = “person”)。

person:
      name: zhangsanfeng
      age: 3
      happy: true
      maps: { key1: 'value1', key2: 'value2'}
      lists:
        - code
        - music
        - gril
      dog:
        name: 小二黑
        age: 1

package com.zhang;
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.stereotype.Component;
    
    import java.util.List;
    import java.util.Map;
    
    @Component
    @ConfigurationProperties(prefix = "person")
    public class Person { 
        private  String name;
        private  String age;
        private  Boolean happy;
        private  List<Object> lists;
        private  Map<String,Object> maps;
        private  Dog dog;
    
        public Person() { 
        }
    
        public Person(String name, String age, Boolean happy, List<Object> lists,Map<String,Object> maps, Dog dog) { 
            this.name = name;
            this.age = age;
            this.happy = happy;
            this.maps = maps;
            this.lists = lists;
            this.dog = dog;
        }
    
        public String getName() { 
            return name;
        }
    
        public void setName(String name) { 
            this.name = name;
        }
    
        public String getAge() { 
            return age;
        }
    
        public void setAge(String age) { 
            this.age = age;
        }
    
        public Boolean getHappy() { 
            return happy;
        }
    
        public void setHappy(Boolean happy) { 
            this.happy = happy;
        }
    
        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;
        }
    
        public Map<String, Object> getMap() { 
            return maps;
        }
    
        public void setMap(Map<String, Object> maps) { 
            this.maps = maps;
        }
    }

# 方式三：通过配置文件application.properties进行赋值 #

name=zhangsanfeng

PropertySource指定加载的配置文件，通过EL表达式"$\{name\}"或者@Value(“李四光砸缸”)进行赋值

package com.zhang;
    
    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.List;
    import java.util.Map;
    
    @Component
    //@ConfigurationProperties(prefix = "person")
    @PropertySource(value = "classpath:application.properties")
    public class Person { 
    
        @Value("${name}")
        //@Value("李四光砸缸")
        private  String name;
        private  String age;
        private  Boolean happy;
        private  List<Object> lists;
        private  Map<String,Object> maps;
        private  Dog dog;
    
        public Person() { 
        }
    
        public Person(String name, String age, Boolean happy, List<Object> lists,Map<String,Object> maps, Dog dog) { 
            this.name = name;
            this.age = age;
            this.happy = happy;
            this.maps = maps;
            this.lists = lists;
            this.dog = dog;
        }
    
        public String getName() { 
            return name;
        }
    
        public void setName(String name) { 
            this.name = name;
        }
    
        public String getAge() { 
            return age;
        }
    
        public void setAge(String age) { 
            this.age = age;
        }
    
        public Boolean getHappy() { 
            return happy;
        }
    
        public void setHappy(Boolean happy) { 
            this.happy = happy;
        }
    
        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;
        }
    
        public Map<String, Object> getMap() { 
            return maps;
        }
    
        public void setMap(Map<String, Object> maps) { 
            this.maps = maps;
        }
    }

**参考文章**  
https://www.cnblogs.com/neaos/p/10790528.html  
https://blog.csdn.net/weixin\_43075247/article/details/105415572