@PropertySource配置的用法

功能

加载指定的属性文件（*.properties）到 Spring 的 Environment 中。可以配合 @Value 和@ConfigurationProperties 使用。

• @PropertySource 和 @Value

  组合使用，可以将自定义属性文件中的属性变量值注入到当前类的使用@Value注解的成员变量中。

• @PropertySource 和 @ConfigurationProperties

  组合使用，可以将属性文件与一个Java类绑定，将属性文件中的变量值注入到该Java类的成员变量中。

源码

package org.springframework.context.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

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

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Repeatable(PropertySources.class)
public @interface PropertySource {

    /**
     * 属性源的名称
     */
    String name() default "";

    /**
     * 属性文件的存放路径
     */
    String[] value();

    /**
     * 如果指定的属性源不存在，是否要忽略这个错误
     */
    boolean ignoreResourceNotFound() default false;

    /**
     * 属性源的编码格式
     */
    String encoding() default "";

    /**
     * 属性源工厂
     */
    Class<? extends PropertySourceFactory> factory() default PropertySourceFactory.class;

}

使用示例

属性文件：demo.properties

demo.name=huang
demo.sex=1
demo.type=demo

示例一：@PropertySource + @Value

package com.huang.pims.demo.props;

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

@Component
@PropertySource(value = {"demo/props/demo.properties"})
public class ReadByPropertySourceAndValue {

    @Value("${demo.name}")
    private String name;

    @Value("${demo.sex}")
    private int sex;

    @Value("${demo.type}")
    private String type;

    @Override
    public String toString() {
        return "ReadByPropertySourceAndValue{" +
                "name='" + name + '\'' +
                ", sex=" + sex +
                ", type='" + type + '\'' +
                '}';
    }
}

示例二：@PropertySource 和 @ConfigurationProperties

package com.huang.pims.demo.props;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Component
@PropertySource(value = {"demo/props/demo.properties"})
@ConfigurationProperties(prefix = "demo")
public class ReadByPropertySourceAndConfProperties {

    private String name;

    private int sex;

    private String type;

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

    public void setSex(int sex) {
        this.sex = sex;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getName() {
        return name;
    }

    public int getSex() {
        return sex;
    }

    public String getType() {
        return type;
    }

    @Override
    public String toString() {
        return "ReadByPropertySourceAndConfProperties{" +
                "name='" + name + '\'' +
                ", sex=" + sex +
                ", type='" + type + '\'' +
                '}';
    }
}

示例测试

package com.huang.pims.demo.runners;

import com.huang.pims.demo.props.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class OutputPropsRunner implements CommandLineRunner {

    private static final Logger LOGGER = LoggerFactory.getLogger(OutputPropsRunner.class);

    @Autowired
    private ReadByPropertySourceAndValue readByPropertySourceAndValue;

    @Autowired
    private ReadByPropertySourceAndConfProperties readByPropertySourceAndConfProperties;

    @Override
    public void run(String... args) throws Exception {
        LOGGER.info(readByPropertySourceAndValue.toString());
        LOGGER.info(readByPropertySourceAndConfProperties.toString());
    }

}

启动项目即可看到效果。