springBoot属性文件中的值获取

╰半橙微兮° 2022-05-06 11:00 343阅读 0赞

1、使用springBoot中自带的属性文件application.properties

datasource.driverName=com.mysql.jdbc.Driver
    datasource.url=jdbc:mysql://localhost:3306/test
    datasource.password=root
    datasource.username=root

创建一个数据源的类

package com.spring.boot.chapter3.config;
    
    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;
    
    @Component
    public class DataBaseProperties {
    		@Value("${datasource.driverName}")
    		private String driverName = null;
    		@Value("${datasource.url}")
    		private String url = null;
    		private String username = null;
    		private String password = null ;
    		public String getDriverName() {
    			return driverName;
    		}
    		public void setDriverName(String driverName) {
    			System.out.println(driverName);
    			this.driverName = driverName;
    		}
    		public String getUrl() {
    			return url;
    		}
    		public void setUrl(String url) {
    			System.out.println(url);
    			this.url = url;
    		}
    		public String getUsername() {
    			return username;
    		}
    		@Value("${datasource.username}")
    		public void setUsername(String username) {
    			this.username = username;
    		}
    		public String getPassword() {
    			return password;
    		}
    		@Value("${datasource.password}")
    		public void setPassword(String password) {
    			this.password = password;
    		}
    		@Override
    		public String toString() {
    			return "DataBaseProperties [driverName=" + driverName + ", url=" + url + ", username=" + username
    					+ ", password=" + password + "]";
    		}
    
    }

在控制器中获取该数据源的值

public class indexController {
    	 @Autowired
    	 private com.spring.boot.chapter3.config.DataBaseProperties dataBaseProperties;
    	@RequestMapping(value="/index")
    	public String indexCon() {
    		System.out.println(dataBaseProperties.getDriverName());
    		return "index";
    	}
    }

2、自定义属性文件，jdbc.properties,获取属性文件中值的方式不一样，同时在数据源类上需要加注解

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;
    
    @Component
    **@ConfigurationProperties("datasource")
    @PropertySource(value="classpath:jdbc.properties")**
    public class DataBaseProperties {
    		private String driverName;
    	   private String url = null;
        	private String username = null;
           private String password = null ;
        	public String getDriverName() {
    			return driverName;
    	}
    	public void setDriverName(String driverName) {
    			System.out.println(driverName);
    			this.driverName = driverName;
    		}
    	public String getUrl() {
    			return url;
    		}
    	public void setUrl(String url) {
    			this.url = url;
    		}
    	public String getUsername() {
    		return username;
    	}
    	public void setUsername(String username) {
    			this.username = username;
    		}
    	public String getPassword() {
    		return password;
    		}
    	public void setPassword(String password) {
    			this.password = password;
    }
    	@Override
    		public String toString() {
    			return "DataBaseProperties [driverName=" + driverName + ", url=" + url + ", username=" + username
    				+ ", password=" + password + "]";
    	}	
    	}

@ConfigurationProperties(“datasource”) ，由该值和类中属性名称合并获取对应属性文件的值  
@PropertySource(value=“classpath:jdbc.properties”)，指明属性文件的位置