@PropertySource

目錄

• ​​功能​​
• ​​源碼​​
• ​​使用示例​​

• ​​示例一：@PropertySource + @Value ​​
• ​​示例二：@PropertySource 和 @ConfigurationProperties ​​

• ​​示例測試​​

功能

　　加載指定的屬性檔案（*.properties）到 Spring 的 Environment 中。可以配合 @Value 和 @ConfigurationProperties 使用。

• @PropertySource 和 @Value 組合使用，可以将自定義屬性檔案中的屬性變量值注入到目前類的使用@Value注解的成員變量中。
• @PropertySource 和 @ConfigurationProperties 組合使用，可以将屬性檔案與一個Java類綁定，将屬性檔案中的變量值注入到該Java類的成員變量中源碼：

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 {

    /**
     * 屬性源的名稱
     */
    String name() default "";

    /**
     * 屬性檔案的存放路徑
     */
    String[] value();

    /**
     * 如果指定的屬性源不存在，是否要忽略這個錯誤
     */
    boolean ignoreResourceNotFound() default false;

    /**
     * 屬性源的編碼格式
     */
    String encoding() default "";

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

}      

• 使用示例
• 屬性檔案：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 + '\'' +
                '}';
    }
}      

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 + '\'' +
                '}';
    }
}      

示例測試

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());
    }

}