@PropertySource 注解的使用

目录

   

前言

1 @Value+@PropertySource读取.properties配置文件

2 @Value+@PropertySource读取.yml配置文件

3 @ConfigurationProperties+@PropertySource读取.properties配置文件

 4@ConfigurationProperties+@PropertySource读取.yml配置文件

---

前言

使用 @ConfigurationProperties 注解可以将 application.yml 或 application.properties 主配置文件中的属性值与 Java Bean 对应属性进行注入。

    此时如果所有属性值都配置在主配置文件中，主配置文件就会越来越庞大，这显然是不可以的。此时我们可以使用 Spring 为我们提供的 @PropertySource 注解，去加载指定的配置文件，然后结合 @ConfigurationProperties 注解，便能够实现指定配置文件与 Java Bean 的注入操作。

创建spring boot maven项目

    4.0.0

    org.***
    LearnSpringBoot2-javaproject
    1.0-SNAPSHOT

    
        org.springframework.boot
        spring-boot-starter-parent
        2.3.4.RELEASE
    
    

    
    
        org.springframework.boot
        spring-boot-starter
    
        
            org.springframework.boot
            spring-boot-configuration-processor
        
    
    
        8
        8
        UTF-8
    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

1 @Value+@PropertySource读取.properties配置文件

      新建一个 person.properties 配置文件，用来存放 Person 类的配置信息。接下来使用 @ PropertySource 注解，来实现通过读取该配置，实现配置文件与 Java Bean 类的注入操作。

#person.properties
person.name=liqq
person.staticpro=staticproValue
person.hobbiess=game,tv,sing
person.list=basketball tennis swim
person.map={aa:"aa",bb:"bb"}
person.age=28
person.birthday=2023-07-07 12:12:12
address.province=某某省
address.distinct= 某某市
address.county=某某区

Person类

package com.cect.ConfigurationPropertiesPackage;
import org.springframework.beans.factory.annotation.Value;
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:person.properties"})
public class Person {
    @Value("${person.name}")
    private String name;
    @Value("${person.staticpro:aa}")
    public static String staticpro;
    @Value("${person.hobbiess}")
    private String[] hobbiess;
    @Value("#{'${person.list:111 222 333}'.split(' ')}")
    private List list;
    @Value("#{${person.map:{'cc':'ccc','dd':'ddd'}}}")
    private Map map;
    @Value("#{address}")
    private Address address;
    @Value("#{T(java.io.File).separator}")
    private String path;
    @Value("#{T(java.lang.Math).random()}")
    private double randomValue;
    //注入时间属性需要使用@DateTimeFormat格式化或者使EL表达式
    //@DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")
    @Value(("#{new java.text.SimpleDateFormat(\"yyyy-MM-dd HH:mm:ss\").parse('${person.birthday}')}"))
    private Date birthday;
    @Value("#{systemProperties['os.name']}")
    private String systemPropertiesName;
    /*setter and getter */
}

Address类

package com.cect.ConfigurationPropertiesPackage;

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

@Component
@PropertySource(value = {"classpath:person.properties"})
public class Address {
    @Value("${address.province}")
    private String province;
    @Value("${address.distinct}")
    private String distinct;
    @Value("${address.county}")
    private String county;

    /*gette and setter method*/
}

测试类

2 @Value+@PropertySource读取.yml配置文件

pring Boot 默认不支持@PropertySource读取yaml 文件。

可以通过引入 PropertySourceFactory 接口使之成为可能。PropertySourceFactory 是PropertySource 的工厂类。默认实现是 DefaultPropertySourceFactory，可以构造ResourcePropertySource 实例。

注意：YAML 需要 SnakeYAML 1.18 或者更高版本。

@PropertySource 注解有一个 factory 属性，通过这个属性来入 PropertySourceFactory，这里给出 YamlPropertySourceFactory的例子

import org.springframework.core.io.support.PropertySourceFactory;

import java.io.IOException;
import java.util.Properties;

public class YamlPropertySourceFactory implements PropertySourceFactory {
    @Override
    public PropertySource createPropertySource(String name, EncodedResource resource) throws IOException {
        YamlPropertiesFactoryBean factory=new YamlPropertiesFactoryBean();
        factory.setResources(resource.getResource());
        factory.afterPropertiesSet();
        Properties  ymlProperties = factory.getObject();
        String propertyName=name!=null?name:resource.getResource().getFilename();
        return new PropertiesPropertySource(propertyName,ymlProperties);
    }
}

package com.cect.ConfigurationPropertiesPackage;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.List;
import java.util.Map;
@Component
@PropertySource(value = {"classpath:person.yml"}, factory = YamlPropertySourceFactory.class)
public class Person {
    @Value("${person.name}")
    private String name;
    @Value("${person.staticpro:aa}")
    public static String staticpro;
    @Value("${person.hobbiess}")
    private String[] hobbiess;
    @Value("#{'${person.list:111 222 333}'.split(' ')}")
    private List list;
    @Value("#{${person.map:{'cc':'ccc','dd':'ddd'}}}")
    private Map map;
    @Value("#{address}")
    private Address address;
    @Value("#{T(java.io.File).separator}")
    private String path;
    @Value("#{T(java.lang.Math).random()}")
    private double randomValue;
   //@Value(("#{new java.text.SimpleDateFormat(\"yyyy-MM-dd HH:mm:ss\").parse('${person.birthday}')}"))
   @Value("${person.birthday}")
    private Date birthday;
    @Value("#{systemProperties['os.name']}")
    private String systemPropertiesName;
    /*setter and getter */
}

package com.cect.ConfigurationPropertiesPackage;

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

@Component
@PropertySource(value = {"classpath:person.yml"}, factory = YamlPropertySourceFactory.class)
public class Address {
   @Value("${address.province}")
    private String province;
   @Value("${address.distinct}")
    private String distinct;
    @Value("${address.county}")
    private String county;
/*gette and setter method*/
}

person.yml

person:
  age: 27
  name: scy
  staticpro: staticproValue
  hobbiess: game,tv,sing
  list:
          basketball
          tennis
          swim
  map: '{ aa: "aaa",bb: "bbb"}'
  birthday: 2022-01-07 12:12:12

address:
         province: 某某省
         distinct: 某某市
         county: 某某县

测试结果

3 @ConfigurationProperties+@PropertySource读取.properties配置文件

person.properties

person.name=lixq
person.staticpro=staticproValue
person.hobbiess=game,tv,sing
person.list=basketball,tennis,swim
person.map.aa="aaa"
person.map.bb="bbb"
person.age=28
person.birthday=2023-07-08 13:13:13
address.province=某某省
address.distinct= 某某市
address.county=某某区

Person类

package com.cect.ConfigurationPropertiesPackage;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.List;
import java.util.Map;
@Component
@ConfigurationProperties(prefix = "person")
@PropertySource(value = {"classpath:person.properties"})
public class Person {

    private String name;
    public static String staticpro;
    private String[] hobbiess;
    private List list;
    private Map map;
    @Autowired
    private Address address;
    private String path;
    private double randomValue;
    @DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")
    private Date birthday;
    private String systemPropertiesName;
    /*setter and getter */
}

Address类

package com.cect.ConfigurationPropertiesPackage;

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(prefix = "address")
@PropertySource(value = {"classpath:person.properties"})
public class Address {

    private String province;

    private String distinct;

    private String county;

    /*gette and setter method*/
}

测试类

package com.cect.ConfigurationPropertiesPackage;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

@SpringBootApplication
public class TestClass {
    public static void main(String args[]){
        ConfigurableApplicationContext context=  SpringApplication.run(TestClass.class,args);
        Person person = context.getBean("person",Person.class);
        System.out.println("person.getList()="+person.getList().size());
        System.out.println("person.getMap()="+person.getMap().toString());
        System.out.println("person.getAddress()="+person.getAddress().toString());
        System.out.println("person.getPath()="+person.getPath());
        System.out.println("person.getRandomValue()="+person.getRandomValue());
        System.out.println("person.getBirthday()="+person.getBirthday());
        System.out.println("person.getSystemPropertiesName()="+person.getSystemPropertiesName());
        System.out.println("person.getHobbiess().length="+person.getHobbiess().length);
        System.out.println("person.getName()="+person.getName());
    }
    }

测试结果

 4 @ConfigurationProperties+@PropertySource读取.yml配置文件

person.yml

person:
  age: 27
  name: scy
  staticpro: staticproValue
  hobbiess: game,tv,sing
  list:
          basketball
          tennis
          swim
  map: { "aa": "aaa","bb": "bbb"}
  birthday: 2022-01-07 12:12:12

address:
         province: 某某省
         distinct: 某某市
         county: 某某县

package com.cect.ConfigurationPropertiesPackage;

import org.springframework.beans.factory.config.YamlPropertiesFactoryBean;
import org.springframework.core.env.PropertiesPropertySource;
import org.springframework.core.env.PropertySource;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.core.io.support.PropertySourceFactory;

import java.io.IOException;
import java.util.Properties;

public class YamlPropertySourceFactory implements PropertySourceFactory {
    @Override
    public PropertySource createPropertySource(String name, EncodedResource resource) throws IOException {
        YamlPropertiesFactoryBean factory=new YamlPropertiesFactoryBean();
        factory.setResources(resource.getResource());
        factory.afterPropertiesSet();
        Properties  ymlProperties = factory.getObject();
        String propertyName=name!=null?name:resource.getResource().getFilename();
        return new PropertiesPropertySource(propertyName,ymlProperties);
    }
}

package com.cect.ConfigurationPropertiesPackage;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.List;
import java.util.Map;
@Component
@ConfigurationProperties(prefix = "person")
@PropertySource(value = {"classpath:person.yml"},factory = YamlPropertySourceFactory.class)
public class Person {

    private String name;
    public static String staticpro;
    private String[] hobbiess;
    private List list;
    private Map map;
    @Autowired
    private Address address;
    private String path;
    private double randomValue;
    @DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")
    private Date birthday;
    private String systemPropertiesName;
    /*setter and getter */
}

package com.cect.ConfigurationPropertiesPackage;

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(prefix = "address")
@PropertySource(value = {"classpath:person.yml"},factory = YamlPropertySourceFactory.class)
public class Address {

    private String province;

    private String distinct;

    private String county;

    /*gette and setter method*/
}