设置静态变量工具类

• 如果有工具类的静态变量需要读取配置文件(主要指 springboot 的配置文件)，而又不想让工具类作为一个 bean 存在
• 可以使用代理模式注入

一些属性

jwt:
  secretKey: )nikonikoni520akarin20200115)
  # 业务 token
  accessTokenExpireTime: PT2H
  # pc 端刷新 token
  refreshTokenExpireTime: PT8H
  # app 端刷新 token
  refreshTokenExpireAppTime: P30D
  issuer: nekosighed.com

一个工具类

/**
 * jwt 工具类
 */
@Slf4j
public class JwtUtil {
    // 下面是需要读取配置文件中的
    private static String secretKey;
    private static Duration accessTokenExpireTime;
    private static Duration refreshTokenExpireTime;
    private static Duration refreshTokenExpireAppTime;
    private static String issuer;
    /**
     * 让代理类 SetStaticValue2Util 来调用
     *
     * @param jwtReadValue 真正读取配置文件的类
     */
    public static void setStaticValue(JwtReadValue jwtReadValue) {
        secretKey = jwtReadValue.getSecretKey();
        accessTokenExpireTime = jwtReadValue.getAccessTokenExpireTime();
        refreshTokenExpireTime = jwtReadValue.getRefreshTokenExpireTime();
        refreshTokenExpireAppTime = jwtReadValue.getRefreshTokenExpireAppTime();
        issuer = jwtReadValue.getIssuer();
        base64SignKey = DatatypeConverter.parseBase64Binary(secretKey);
    }
    // 其他方法
}

一个真正读取配置文件的类

@Component
@ConfigurationProperties(prefix = "jwt")
@Data
public class JwtReadValue {
    private String secretKey;
    private Duration accessTokenExpireTime;
    private Duration refreshTokenExpireTime;
    private Duration refreshTokenExpireAppTime;
    private String issuer;
}

代理注入类

/**
 * 给工具类们设置静态变量
 */
@Component
public class SetStaticValue2Util {
    /**
     * 调用工具类们的方法
     *
     * @param jwtReadValue
     */
    public SetStaticValue2Util(JwtReadValue jwtReadValue) {
        JwtUtil.setStaticValue(jwtReadValue);
    }
}