SprngBoot 03.配置文件-读取配置文件

阳光穿透心脏的1/2处 2022-04-08 10:12 277阅读 0赞

加载将配置文件属性映射到java对象中。

1.配置文件

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>org.springboot</groupId>
      <artifactId>springboot_02propertys</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      
      
    <parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.5.9.RELEASE</version>
    		<relativePath/> 
    	</parent>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		<java.version>1.8</java.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    </project>

2.编写application.yml 配置文件。路径在项目根目录下。

server:
      port: 8081
      
      
    person:
      name: yy #String 对
      maps: { k1: 1,k2: 2} # Map对象
      list1: ['1','2'] # list 行内写法
      list2:
          - 1
          - 2
      user: # 自定义对象
          name: yyy

2.编写Person类和User类

package org.spring;
    
    import java.util.List;
    import java.util.Map;
    import java.util.Set;
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.stereotype.Component;
    /** * @Component:定义为容器组件 * @PropertySource:加载指定配置文件 * @ConfigurationProperties：加载配置文件中person段内容与Person对象进行绑定 * ps:属性必须有set方法。 * List<Object> lists; 必须制定集合里对象的类型。不然注入失败 * */
    
    @Component
    @PropertySource(value={ "classpath:application.yaml"})
    @ConfigurationProperties(prefix="person")
    public class Person { 
    	String name;
    	List<Object> list1;
    	List<Object> list2;
    	Map maps;
    	
    	
    	public Map getMaps() { 
    		return maps;
    	}
    
    	public void setMaps(Map maps) { 
    		this.maps = maps;
    	}
    
    	
    
    
    
    	@Override
    	public String toString() { 
    		return "Person [name=" + name + ", list1=" + list1 + ", list2=" + list2 + ", maps=" + maps + ", user=" + user
    				+ "]";
    	}
    
    	public List<Object> getList1() { 
    		return list1;
    	}
    
    	public void setList1(List<Object> list1) { 
    		this.list1 = list1;
    	}
    
    	public List<Object> getList2() { 
    		return list2;
    	}
    
    	public void setList2(List<Object> list2) { 
    		this.list2 = list2;
    	}
    
    	public User getUser() { 
    		return user;
    	}
    
    	public void setUser(User user) { 
    		this.user = user;
    	}
    
    	User user;
    	public String getName() { 
    		return name;
    	}
    
    	
    	public void setName(String name) { 
    		this.name = name;
    
    	}
    }
    
    
    
    package org.spring;
    
    public class User { 
    	String name;
    
    	@Override
    	public String toString() { 
    		return "User [name=" + name + "]";
    	}
    
    	public String getName() { 
    		return name;
    	}
    
    	public void setName(String name) { 
    		this.name = name;
    	}
    }

3.编写自动类

package org.spring;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class MainSpringBoot { 
    
    	public static void main(String[] args) { 
    			SpringApplication.run(MainSpringBoot.class,args);
    
    	}
    
    }

4.编写测试类

package org.spring;
    
    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)
    @SpringBootTest
    public class MainTest { 
    	@Autowired
    	Person person;
    	
    	@Test
    	public void funTest(){ 
    		
    		System.out.println(person);
    	}
    }
    
    /** 测试必须有启动类 测试类名字不能是Test funTest测试方法的封装等级必须是共有的 **/

5.控制台结果

Person [name=yy, list1=[1, 2], list2=[1, 2], maps={ k1=1, k2=2}, user=User [name=yyy]]