1、application.properties 配置文件

mail.username=xue@163.commail.password=xuemail.host=smtp.163.commail.smtp.auth=true

2、給普通變量賦值，直接在變量上添加 @Value 注解

import org.springframework.beans.factory.annotation.Value;public class MailConfig { @Value('${mail.username}') private String username; @Value('${mail.password}') private String password; @Value('${mail.host}') private String host;}

3、給靜態變量賦值，直接在靜態變量上添加 @Value 注解無效

4、給靜態變量賦值

1、使用 set 方法

import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;@Componentpublic class MailConfig { public static String username; public static String password; public static String host; @Value('${mail.username}') public void setUsername(String username) { this.username = username; } @Value('${mail.password}') public void setPassword(String password) { this.password = password; } @Value('${mail.host}') public void setHost(String host) { this.host = host; }}

2、使用 @PostConstruct（推薦使用）

import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;import javax.annotation.PostConstruct;@Componentpublic class MailConfig { public static String USERNAME; public static String PASSWORD; public static String HOST; @Value('${mail.username}') private String username; @Value('${mail.password}') private String password; @Value('${mail.host}') private String host; @PostConstruct public void init() { USERNAME = username; PASSWORD = password; HOST = host; }}

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