关于springboot:SpringBoot-使用-Value-注解读取配置文件给静态变量赋值

1、application.properties 配置文件

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

2、给一般变量赋值，间接在变量上增加 @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、给动态变量赋值，间接在动态变量上增加 @Value 注解有效

4、给动态变量赋值

1、应用 set 办法

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、应用 @PostConstruct（举荐应用）

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;    }}